Release Notes for Cisco uBR7200 Series for
Cisco IOS Release 12.3BC
Revised: February 28, 2011, OL-6763-49
The release notes for Cisco IOS Release 12.3BC for the Cisco uBR7200 series universal broadband
routers describe the enhancements and caveats for all releases in the cable-specific, early deployment,
12.3BC release trains. Some of the most recent releases in 12.3BC include 12.3(17b)BCx-,
12.3(21a)BCx-, and 12.3(23)BCx-based releases.
These release notes are updated with each release in the train. This update adds information for Cisco
IOS Release 12.3(21a)BC9 . For a list of the updated caveats that apply to each release, see the “Caveats
for Cisco IOS Release 12.3 BC” section on page 102 and Caveats for Cisco IOS Release12.3T. Use these
release notes in conjunction with the cross-platformRelease Notes for Cisco IOS Release 12.3 T located
on Cisco.com and the Documentation CD-ROM.
Note
Cisco IOS Release 12.3(23)BC6 does not include support for telco-return images.
Cisco recommends that you view the field notices for this release to see if your software or hardware
platforms are affected. If you have an account on Cisco.com, you can find field notices at
http://www.cisco.com/en/US/support/tsd_products_field_notice_summary.html. If you do not have a
Cisco.com login account, you can find field notices at
http://www.cisco.com/en/US/support/tsd_products_field_notice_summary.html.
Contents
These release notes describe the following topics:
•
Introduction, page 2
•
Early Deployment Releases, page 4
•
System Requirements, page 9
•
Feature Support, page 20
•
New and Changed Information, page 22
Americas Headquarters:
Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA
© 2011 Cisco Systems, Inc. All rights reserved.
Introduction
•
MIBs, page 76
•
Important Notes, page 77
•
Caveats for Cisco IOS Release 12.3 BC, page 102
•
Related Documentation, page 354
•
Obtaining Documentation, Obtaining Support, and Security Guidelines, page 358
Introduction
For information on new features and the Cisco IOS documentation set supported by Cisco IOS
Release 12.3(23)BC6, see the “New and Changed Information” section on page 22 and the “Related
Documentation” section on page 354.
Cisco uBR7200 Series Universal Broadband Routers
The Cisco uBR7200 series universal broadband routers—the Cisco uBR7223, the Cisco uBR7246, and
the Cisco uBR7246VXR—are based on the Data-over-Cable Service Interface Specification (DOCSIS)
standards. Each is designed to be installed at a cable operator’s headend facility or distribution hub and
to function as the cable modem termination system (CMTS) for subscriber-end devices such as the
Cisco uBR905 and Cisco uBR925 cable access routers, and other DOCSIS-compliant cable modems
(CMs) and set-top boxes (STBs).
Cisco uBR7200 series universal broadband routers allow two-way transmission of digital data and Voice
over IP (VoIP) traffic over a hybrid fiber-coaxial (HFC) network. The Cisco uBR7200 series routers
support IP routing with a wide variety of protocols and combinations of Ethernet, Fast Ethernet, Gigabit
Ethernet, serial, High-Speed Serial Interface (HSSI), Packet over SONET (POS) OC-3 and OC-12c,
Asynchronous Transfer Mode (ATM) media, and EtherChannel trunking technology.
Cisco IOS Release 12.3(23)BC6 supports the Cisco uBR7246VXR, Cisco uBR7246, and
Cisco uBR7223 universal broadband routers.
Cisco uBR7246VXR Universal Broadband Router
The Cisco uBR7246VXR offers an industry-proven CMTS and carrier-class router in a scalable platform
with a high-performance network processing engine to support data, voice, and video services for
medium to large network installations.
The Cisco uBR7246VXR provides the following major hardware features:
•
High-performance network processing engine
•
I/O controller
•
Up to two network interface port adapters
•
Up to four cable interface line cards
•
Up to two removable power supplies providing load-sharing and redundancy capabilities
•
Two Personal Computer Memory Card International Association (PCMCIA) slots that allow for
software upgrades through the use of Flash memory cards
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
2
OL-6763-49
Introduction
Note
The Cisco uBR7246VXR chassis does not support the MC11-FPGA cable interface line card.
Cisco uBR7246 Universal Broadband Router
The Cisco uBR7246 offers an industry-proven CMTS and carrier-class router in a scalable platform to
support data, voice, and video services for medium to large network installations.
The Cisco uBR7246 provides the following major hardware features:
Note
•
Network processing engine
•
I/O controller
•
Up to two network interface port adapters
•
Up to four cable interface line cards
•
Up to two removable power supplies providing load-sharing and redundancy capabilities
•
Two PCMCIA slots that allow for software upgrades through the use of Flash memory cards
The Cisco uBR7246 router reached its End of Sale (EOS) point on November 15, 2001. For details see
Product Bulletin No. 1438, which is at the following URL:
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_eol_models.html.
Cisco uBR7223 Universal Broadband Router
The Cisco uBR7223 is a cost-effective, scalable interface between subscriber cable modems and the
backbone data network, and is designed specifically for small to medium network installations.
The Cisco uBR7223 provides the following major hardware features:
Note
•
High-performance network processing engine
•
I/O controller
•
One network interface port adapter
•
Up to two cable interface line cards
•
One removable power supply (The Cisco uBR7223 does not feature load-sharing and redundant
power supply capability like the Cisco uBR7246VXR and Cisco uBR7246.)
•
Two PCMCIA slots that allow for software upgrades through the use of Flash memory cards
The Cisco uBR7223 router reached its End of Sale (EOS) point on October 23, 2002. For details see
Product Bulletin No. 1955, which is at the following URL:
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_eol_models.html.
Cisco uBR7200 Series Universal Broadband Router Overview
Table 1 provides a quick overview of the major hardware features of the three Cisco uBR7200 series
universal broadband routers.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
3
Early Deployment Releases
Table 1
Cisco uBR7200 Series Universal Broadband Router Overview
Supported Hardware
Cisco uBR7246VXR
Cisco uBR72461
Network Processing Engine
One of the following:
One of the following: One of the following:
I/O Controller
Cisco uBR72232
•
UBR7200-NPE-G1
•
NPE-150
•
NPE-150
•
NPE-225
•
NPE-200
•
NPE-200
•
NPE-300
•
NPE-225
•
NPE-225
•
NPE-400
One of the following:
One of the following: One of the following:
•
UBR7200-I/O
•
UBR7200-I/O
•
UBR7200-I/O
•
UBR7200-I/O-FE
•
UBR7200-I/O-FE
•
UBR7200-I/O-FE
•
UBR7200-I/O-2FE/E
Network Interface Port
Adapters
up to 2
up to 2
1
Cable Interface Line Cards
up to 4
up to 4
up to 2
Removable Power Supplies
up to 2
up to 2
1
PCMCIA Slots
2
2
2
1. End of Sale (EOS) point on November 15, 2001.
2. End of Sale (EOS) point on October 23, 2002.
Note
The UBR7200-NPE-G1 does not require that an I/O controller be installed. For additional information,
refer to the Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.2 BC on Cisco.com:
http://www.cisco.com/en/US/docs/ios/12_2/12_2b/12_2bc/release/notes/u7208bc1.html.
Early Deployment Releases
These release notes describe the Cisco uBR7200 series universal broadband routers for
Cisco IOS Release 12.3(23)BC6. Feature support is cumulative from release to release, unless otherwise
noted.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
4
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Early Deployment Releases
Supported Features
The Cisco IOS Release 12.3BC train supports the following new features.
Table 2
Early Deployment (ED) Releases for the Cisco uBR7200 Series
ED Release
Software Features1 and MIBs2
Hardware Features
Hardware
Availability
Cisco IOS Release
12.3(23)BC10
None
None
None
Cisco IOS Release
12.3(23)BC9
None
None
None
Cisco IOS Release
12.3(21a)BC9
None
None
None
Cisco IOS Release
12.3(23)BC8
None
None
None
None
Now
Cisco IOS Release
12.3(23)BC7
•
Enhanced Show Tech
•
Cable Modem QoS Information
•
Direct Load for Cable Modems
•
Three Step Dynamic Modulation
Cisco IOS Release
12.3(23)BC6
None
None
Now
Cisco IOS Release
12.3(23)BC5
None
None
Now
Cisco IOS Release
12.3(23)BC4
None
None
Now
Cisco IOS Release
12.3(21a)BC8
None
None
Now
Cisco IOS Release
12.3(23)BC3
None
None
Now
None
Now
Cisco IOS
None
Release 12.3(21a)BC7
None
Now
Cisco IOS
Release 12.3(23)BC1
None
Now
Cisco IOS
None
Release 12.3(21a)BC6
None
Now
Cisco IOS
None
Release 12.3(21a)BC5
None
Now
Cisco IOS
Release 12.3(23)BC
None
None
Now
Cisco IOS
None
Release 12.3(21a)BC4
None
Now
Cisco IOS
Release 12.3(23)BC2
•
Subscriber Traffic Management Version 1.2
•
Upstream Utilization Optimization
PacketCable Subscriber ID Support
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
5
Early Deployment Releases
Table 2
Early Deployment (ED) Releases for the Cisco uBR7200 Series (continued)
Hardware Features
Hardware
Availability
None
Now
Cisco IOS
None
Release 12.3(21a)BC2
None
Now
Cisco IOS
None
Release 12.3(21a)BC1
None
Now
None
Now
Cisco IOS
None
Release 12.3(17b)BC9
None
Now
Cisco IOS
None
Release 12.3(17b)BC8
None
Now
Cisco IOS
None
Release 12.3(17b)BC7
None
Now
Cisco IOS
None
Release 12.3(17b)BC6
None
Now
Cisco IOS
None
Release 12.3(17b)BC5
None
Now
Cisco IOS
Release 12.3(17b)BC4
None
Now
Cisco IOS
None
Release 12.3(17b)BC3
None
Now
Cisco IOS
Release 12.3(17a)BC2
None
Now
None
Now
ED Release
Software Features1 and MIBs2
Cisco IOS
Release 12.3(21a)BC3
•
Cisco IOS
Release 12.3(21)BC
Control Point Discovery (CPD)
•
Automatic Virtual Interface Bundles
•
Cable DHCP Enhancements
•
Cable Duplicate MAC Address Reject
•
PacketCable Client Accept Timeout
•
Per Downstream Static Multicast
•
SAMIS Source Address Management
•
Service Flow Admission Control
•
Downstream Load Balancing
•
Advanced-Mode DOCSIS Set-Top Gateway Issue 1.2
•
DOCSIS1.0 ToS Overwrite
Cisco IOS
None
Release 12.3(17a)BC1
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
6
OL-6763-49
Early Deployment Releases
Table 2
Early Deployment (ED) Releases for the Cisco uBR7200 Series (continued)
Hardware Features
Hardware
Availability
None
Now
Cisco IOS
None
Release 12.3(13a)BC6
None
Now
Cisco IOS
None
Release 12.3(13a)BC5
None
Now
Cisco IOS
None
Release 12.3(13a)BC4
None
Now
Cisco IOS
None
Release 12.3(13a)BC3
None
Now
Cisco IOS
None
Release 12.3(13a)BC2
None
Now
Cisco IOS
None
Release 12.3(13a)BC1
None
Now
ED Release
Software Features1 and MIBs2
Cisco IOS
Release 12.3(17a)BC
•
Cable Monitor Enhancements
•
Configurable Leasequery Server
•
Dynamic Channel Change (DCC) for Load Balancing
•
DOCSIS 2.0 SAMIS ECR Data Set
•
DSX Messages and Synchronized PHS Information
•
High Availability Support for Encrypted IP Multicast
•
IPv6 over L2VPN
•
Management Information Base (MIB) Changes and
Enhancements
•
Pre-equalization Control for Cable Modems
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
7
Early Deployment Releases
Table 2
Early Deployment (ED) Releases for the Cisco uBR7200 Series (continued)
ED Release
Software Features1 and MIBs2
Cisco IOS
Release 12.3(13a)BC
•
Access Control List Support for COPS Intercept
•
Admission Control for the Cisco CMTS
•
Advanced-Mode DOCSIS Set-Top Gateway Issue 1.1
•
Cable Monitor Support for Cisco MC28U Broadband
Processing Engines
•
COPS TCP Support for the Cisco Cable Modem
Termination System
•
DOCSIS 1.0 Concatenation Override Featurette
•
Dynamic SID/VRF Mapping Support
•
Enhanced Rate Bandwidth Allocation (ERBA)
Support for DOCSIS 1.0 Cable Modems
•
High Availability Features in Cisco IOS
Release 12.3(13a)BC
•
Multicast QoS Support
•
MLPPP Support
•
PacketCable Multimedia
•
Service Independent Intercept (SII) Support on the
Cisco uBR7200 Series
•
Optional Upstream Scheduler Modes
•
Transparent LAN Service and Layer 2 Virtual Private
Networks
•
Virtual Interface Bundling on the
Cisco uBR-MC28/U BPE
Hardware Features
Hardware
Availability
None
Now
Cisco IOS
Release 12.3(9a)BC8
None
None
Now
Cisco IOS
Release 12.3(9a)BC7
None
None
Now
Cisco IOS
Release 12.3(9a)BC6
None
None
Now
Cisco IOS
Release 12.3(9a)BC5
None
None
Now
Cisco IOS
Release 12.3(9a)BC4
None
None
Now
Cisco IOS
Release 12.3(9a)BC3
None
None
Now
Cisco IOS
Release 12.3(9a)BC2
None
None
Now
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
8
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System Requirements
Table 2
Early Deployment (ED) Releases for the Cisco uBR7200 Series (continued)
ED Release
Software Features1 and MIBs2
Hardware Features
Hardware
Availability
Cisco IOS
Release 12.3(9a)BC1
None
None
Now
None
Now
Cisco IOS
Release 12.3(9a)BC
•
Cisco Broadband Troubleshooter (CBT) 3.2
•
Cisco IOS Release 12.3(9a)BC Command-Line
Interface (CLI) Enhancements
•
DOCSIS Set-top Gateway (DSG) 1.0
•
Cisco DDC (Dual DOCSIS Channel)
•
Dynamic Shared Secret (DMIC) with OUI Exclusion
for DOCSIS
•
Virtual Interface Support and Frequency Stacking
Support
•
Load Balancing Support
•
Subscriber Traffic Management (STM) Version 1.1
•
Transparent LAN Services (TLS) and L2 Tunneling
ATM/SIDs
•
Usage Based Billing (SAMIS)
•
Virtual Interface Support and Frequency Stacking
Support
1. Only major features are listed.
2. MIB = Management Information Base
System Requirements
This section describes the system requirements for Cisco IOS Release 12.3(23)BC6 with the following
topics:
•
Memory Recommendations, page 9
•
DOCSIS System Interoperability on the Cisco uBR7246VXR CMTS, page 11
•
Supported Hardware, page 14
•
Determining Your Software Release, page 20
•
Upgrading to a New Software Release, page 20
Memory Recommendations
Table 3 displays the memory recommendations of the Cisco IOS feature sets for the
Cisco uBR7200 series universal broadband routers for Cisco IOS Release 12.3 BC.
Cisco uBR7200 series routers are only available with a 48 MB or 128 MB of Flash disk memory on the
I/O Controller cards. The UBR7200-NPE-G1 uses compact Flash disk only.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
9
System Requirements
Note
Flash disks, an alternative to linear Flash memory, are Flash memory-based devices that can be used as
file storage media in the PCMCIA card slots of the I/O Controllers. Each I/O Controller has two
PCMCIA slots and can be configured with up to 256 MB of Flash disk memory.
Table 3
Memory Recommendations for the Cisco uBR7200 Series Routers,
Cisco IOS Release 12.3 BC Feature Sets
Software Image
Recommended
Flash Memory
Recommended
DRAM Memory
Runs
From
DOCSIS Two-Way
ubr7200-p-mz
32 MB Flash
256 MB DRAM
RAM
DOCSIS Two-Way IP Plus
ubr7200-is-mz
32 MB Flash
256 MB DRAM
RAM
DOCSIS Two-Way with BPI
ubr7200-k8p-mz
32 MB Flash
256 MB DRAM
RAM
DOCSIS Two-Way IP Plus with BPI ubr7200-ik8s-mz
32 MB Flash
256 MB DRAM
RAM
DOCSIS Two-Way 3DES
ubr7200-k9p-mz
32 MB Flash
256 MB DRAM
RAM
DOCSIS Two-Way 3DES IP Plus
ubr7200-ik9s-mz
32 MB Flash
256 MB DRAM
RAM
Feature Set
Two-Way Data/VoIP Images
Boot Image
UBR7200 Boot Image
ubr7200-kboot-mz None
None
—
UBR7200 Boot Image
ubr7200-boot-mz
None
—
None
The image subset legend for Table 3 is as follows:
•
i = IP routing, MPLS-VPN support, and non-cable interface bridging, including Network Address
Translation (NAT)
•
k8 = DOCSIS Baseline Privacy
•
p = IP routing with Intermediate System-to-Intermediate System (IS-IS) and Border Gateway
Protocol (BGP); MPLS-VPN support; no bridging and no NAT
•
s = “Plus” features: NAT and Inter-Switch Link (ISL)
•
k9 = 3DES level of encryption
Note
All images support all of the hardware listed in the “Supported Hardware” section on page 14, unless
otherwise indicated.
Note
A Cisco uBR7200 series router requires 256 MB of DRAM memory on the NPE processor card when
HCCP redundancy is configured and the router is supporting more than 3,000 cable modems. Using less
memory in these conditions results in temporary out-of-memory situations and incomplete
synchronization between the Working and Protect interfaces.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
10
OL-6763-49
System Requirements
DOCSIS System Interoperability on the Cisco uBR7246VXR CMTS
This section describes the operation of primary interoperability features in the Cisco uBR7246VXR
router. For additional DOCSIS information for the Cisco uBR7246VXR router, refer to the following
document on Cisco.com:
•
DOCSIS 1.1 for Cisco uBR7200 Series Universal Broadband Routers
http://www.cisco.com/en/US/docs/cable/cmts/feature/DOCSIS11.html.
•
DOCSIS 1.1 for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_docs.html.
DOCSIS 1.0 Baseline Privacy
DOCSIS baseline privacy interface (BPI) gives subscribers data privacy across the RF network,
encrypting traffic flows between the CMTS and cable modem. BPI ensures that a cable modem, uniquely
identified by its Media Access Control (MAC) address, can obtain keying material for services only it is
authorized to access.
To enable BPI, choose software at both the CMTS and cable modem that support the BPI mode of
operation. For the Cisco uBR7200 series software, choose an image with “k8” in its file name or BPI in
the feature set description. BPI must be enabled using the DOCSIS configuration file.
The cable modem must also support BPI. Cable modems must have factory-installed RSA private/public
key pairs to support internal algorithms to generate key pairs prior to first BPI establishment.
Note
RSA stands for Rivest, Shamir, and Adelman, inventors of a public-key cryptographic system.
Cable Modem Interoperability
•
The Cisco uBR7200 series router interoperates with DOCSIS-based two-way cable modems that
support basic Internet access, VoIP, or Virtual Private Networks (VPNs).
•
EuroDOCSIS cable modems or set-top boxes (STBs) with integrated EuroDOCSIS cable modems
using Cisco uBR-MC16E cable interface line cards and Cisco OS Release 12.2(4)BC1 or higher.
EuroDOCSIS operation support includes 8-MHz Phase Alternating Line (PAL) or Systeme
Electronique Couleur Avec Memoire (SECAM) channel plans.
Note
Cisco IOS Release 12.3(23)BC6 does not support telco-return cable modems or STBs.
Configuring the CMTS Cable Interface When in Routing Mode
If you have configured a Cisco cable modem for routing mode and are also using the cable-modem
dhcp-proxy nat command on the cable modem, you must configure the corresponding cable interface
on the Cisco uBR7200 series router with the cable dhcp-giaddr policy command. Otherwise, the cable
interface could flap and the cable modem could go offline unpredictably.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
11
System Requirements
DOCSIS 1.0 and 1.0+ Extensions
Earlier releases of Cisco IOS software for the Cisco uBR7246VXR router provide support for the
original DOCSIS 1.0 standard, featuring basic best-effort data traffic and Internet access over the coaxial
cable network. The DOCSIS 1.0+ extensions provides Quality of Service (QoS) enhancements for
real-time traffic, such as voice calls, in anticipation of full DOCSIS 1.1 support.
All DOCSIS 1.0 extensions are activated only when a cable modem or Cisco uBR924 that
supports these extensions solicits services using dynamic MAC messages or the feature set. If
the cable modems in your network are pure DOCSIS 1.0-based, they receive regular DOCSIS
1.0 treatment from the CMTS.
Note
DOCSIS 1.1 Extensions
The DOCSIS 1.1 specification provides the following functional enhancements over DOCSIS 1.0
coaxial cable networks:
•
Enhanced Quality of Service (QoS) to give priority for real-time traffic such as voice and video.
– The DOCSIS 1.0 QoS model (a Service IDs (SID) associated with a QoS profile) has been
replaced with a service flow model that allows greater flexibility in assigning QoS parameters
to different types of traffic and in responding to changing bandwidth conditions.
– Multiple service flows per cable modem supported in either direction due to packet classifiers.
– Support for multiple service flows per cable modem allows a single cable modem to support a
combination of data, voice, and video traffic.
– Greater granularity is available in QoS per cable modem (in either direction), using
unidirectional service flows.
– Dynamic MAC messages are supported to create, modify, and tear down QoS service flows
dynamically when requested by a DOCSIS 1.1 cable modem.
•
Several QoS models are supported for the upstream.
– Best effort-Data traffic is sent on a non-guaranteed best-effort basis.
– Committed Information Rate (CIR) supports the guaranteed minimum bandwidth for data
traffic.
– Unsolicited Grants (UGS) support constant bit rate (CBR) traffic, such as voice, that is
characterized by fixed size packets at fixed intervals.
– Real Time Polling (rtPS) supports Real Time service flows, such as video, that produce unicast,
variable size packets at fixed intervals.
– Unsolicited Grants with Activity Detection (USG-AD) support the combination of UGS and
RTPS, to accommodate real time traffic that might have periods of inactivity (such as voice
using silence suppression). The service flow uses UGS fixed grants while active, but switches
to RTPS polling during periods of inactivity to avoid wasting unused bandwidth.
•
Enhanced time-slot scheduling mechanisms support guaranteed delay/jitter sensitive traffic on the
shared multiple access upstream link.
•
Payload Header Suppression (PHS) conserves link-layer bandwidth by suppressing unnecessary
packet headers on both upstream and downstream traffic flows.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
12
OL-6763-49
System Requirements
•
Layer 2 fragmentation on the upstream prevents large data packets from affecting real-time traffic,
such as voice and video. Large data packets are fragmented and then transmitted in the time slots
that are available between the time slots used for the real-time traffic.
•
Concatenation allows a cable modem to send multiple MAC frames in the same time slot, as opposed
to making an individual grant request for each frame. This avoids wasting upstream bandwidth when
sending a number of very small packets, such as TCP acknowledgement packets.
•
DOCSIS 1.1 cable modems can coexist with DOCSIS 1.0 and 1.0+ cable modems in the same
network—the Cisco uBR7246VXR router provides the levels of service that are appropriate for each
cable modem.
DOCSIS 1.1 Quality of Service
The DOCSIS 1.1 QoS framework is based on the following objects:
•
Service class: A collection of settings maintained by the CMTS that provide a specific QoS service
tier to a cable modem that has been assigned a service flow within a particular service class.
•
Service flow: a unidirectional sequence of packets receiving a service class on the DOCSIS link.
•
Packet classifier: A set of packet header fields used to classify packets onto a service flow to which
the classifier belongs.
•
PHS rule: A set of packet header fields that are suppressed by the sending entity before transmitting
on the link, and are restored by receiving entity after receiving a header-suppressed frame
transmission. Payload Header Suppression increases the bandwidth efficiency by removing repeated
packet headers before transmission.
In DOCSIS 1.1, the basic unit of QoS is the service flow, which is a unidirectional sequence of packets
transported across the RF interface between the cable modem and CMTS. A service flow is characterized
by a set of QoS parameters such as latency, jitter, and throughput assurances.
Every cable modem establishes a primary service flow in both the upstream and downstream directions.
The primary flows maintain connectivity between the cable modem and CMTS at all times.
In addition, a DOCSIS 1.1 cable modem can establish multiple secondary service flows. The secondary
service flows can either be permanently created (they persist until the cable modem is reset or powered
off) or they can be created dynamically to meet the needs of the on demand traffic being transmitted.
Each service flow has a set of QoS attributes associated with it. These QoS attributes define a particular
class of service and determine characteristics such as the maximum bandwidth for the service flow and
the priority of its traffic. The class of service attributes can be inherited from a preconfigured CMTS
local service class (class-based flows), or they can be individually specified at the time of the creation
of the service flow.
Each service flow has multiple packet classifiers associated with it, which determine the type of
application traffic allowed to be sent on that service flow. Each service flow can also have a Payload
Header Suppression (PHS) rule associated with it to determine which portion of the packet header will
be suppressed when packets are transmitted on the flow.
ARP Filter
The cable arp filter command, introduced with Cisco IOS Release 12.2(15)BC2b, enables service
providers to filter ARP request and reply packets, to prevent a large volume of such packets from
interfering with the other traffic on the cable network. For additional information refer to the following
document on Cisco.com:
•
Cable ARP Filtering
http://www.cisco.com/en/US/docs/cable/cmts/feature/cblarpfl.html.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
13
System Requirements
Additional Cable Modem Interoperability
In Cisco IOS Release 12.2(11)BC3c, the following new or enhanced software features are implemented
for DOCSIS 1.1 functionality. Feature support continues with Cisco IOS Release 12.3(9a)BC. (For more
information, see the feature module DOCSIS 1.1 for Cisco uBR7200 Series Universal Broadband
Routers).
•
Clock Synchronization
The Cisco uBR7200 series routers support clock hardware and software to enable high-quality
delivery of IP telephony services through synchronized data transmissions. To support the clock
feature set, a Cisco uBR7246VXR chassis must be used. The Cisco uBR7246VXR must contain a
clock card and either a Cisco uBR-MC16E or Cisco uBR-MC28C cable interface line card. Only
these cards support the external clock reference from the clock card to distribute that signal to CMs
or STBs attached to the specific network segments.
Each cable modem must also support VoIP applications and the clock reference feature set to enable
synchronized timing. The Cisco uBR924 and Cisco uBR925 cable access routers, running
Cisco IOS Release 12.0(7)T or later, supports the clock reference feature set automatically.
•
National Clock Card
The Cisco uBR7246VXR supports the National Clock Card. The National Clock Card allows the
Cisco uBR7246VXR to accept a primary or secondary external clock reference. If there is no
primary clock, the Clock Card goes into Holdover. After a period of 2-10 seconds, the Clock Card
switches to the secondary clock. When the primary clock is back online, the Clock Card switches to
the primary clock after a period of 2-10 seconds. The National Clock Card requires the
Cisco uBR-MC1xS or the Cisco uBR-MC1xE cable interface line card.
Supported Hardware
This section describes the hardware supported by the Cisco uBR7246VXR Universal Broadband Router
in Cisco IOS 12.3BC software releases.
Network Processing Engines
The Cisco uBR7246VXR supports the following Network Processing Engines (NPEs) in
Cisco IOS Release 12.3(23)BC6:
Note
•
UBR7200-NPE-G1
•
NPE-225
•
NPE-300
•
NPE-400
The Cisco UBR7200-NPE-G1, Cisco NPE-300 and Cisco NPE-400 are not supported on the
Cisco uBR7223 and the Cisco uBR7246. The Cisco NPE-150 and Cisco NPE-200 are not supported on
the Cisco uBR7246VXR.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
14
OL-6763-49
System Requirements
Note
The Cisco NPE-300 is at end-of-life and has not been orderable since November 15, 2001. See the
following product bulletin for more details on the Cisco NPE-300 recommended upgrade path:
http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_eol_notices_list.html.
For more information, see the Network Processing Engine and Network Services Engine Installation and
Configuration guide and the Memory Replacement Instructions for the Network Processing Engine or
Network Services Engine and Input/Output Controller guide on Cisco.com.
I/O Controllers
Cisco IOS Release 12.3(23)BC6 supports the following I/O controllers for the Cisco uBR7200 series
universal broadband routers:
•
UBR7200-I/O-2FE/E input/output controller—Two Fast Ethernet ports and one Ethernet port;
equipped with 2 RJ-45 receptacles for 10/100 Mbps operation. Supported for the
Cisco uBR7246VXR router. The Cisco IOS Release 12.1(10)EC boot helper image
[ubr7200-boot-mz.12.1-10.EC] must be used on this controlle.r
•
UBR7200-I/O-FE—One Fast Ethernet port; equipped with an MII receptacle and an RJ-45
receptacle for use at 100 Mbps full-duplex or half-duplex operation. Only 1 receptacle can be
configured for use at a time. Supported for Cisco uBR7223, Cisco uBR7246, and
Cisco uBR7246VXR routers. The 12.0(15)SC [ubr7200-boot-mz.12.0-15.SC] boot helper image is
recommended for this controller.
•
UBR7200-I/O—Has no Fast Ethernet port. Supported for Cisco uBR7223, Cisco uBR7246, and
Cisco uBR7246VXR routers. The 12.0(15)SC [ubr7200-boot-mz.12.0-15.SC] boot helper image is
recommended for this controller.
Note
The Single-Port Fast Ethernet I/O Controller (UBR7200-I/O-FE) reached its End of Sale (EOS) point on
June 30, 2003. For details, see the Addendum to Product Bulletin, No. 1725, which is at the following
URL: http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_eol_notices_list.html
Note
Do not use the 12.1(10)EC boot helper image with the UBR7200-I/O-FE and UBR7200-I/O controllers.
Cable Interface Line Cards
Table 4 provides a quick overview of the cable interface line cards that are supported in Cisco IOS
Release 12.3(23)BC6 for the Cisco uBR7200 series routers:
Table 4
Cisco uBR7200 Series Cable Interface Line Cards
Upstream
Cable Interface Line Card Ports
Downstream
Ports
MC16C
6
1
MC16E
6
1
EuroDOCSIS (Annex A) Support
MC16S
6
1
Supports advanced spectrum management
features.
Additional Features
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
15
System Requirements
Table 4
Cisco uBR7200 Series Cable Interface Line Cards (continued)
Upstream
Cable Interface Line Card Ports
Downstream
Ports
Additional Features
MC16U
6
1
A-TDMA, Adv PHY, CPU
MC16X
6
1
Features dedicated media access control
(MAC) layer hardware.
MC28C
8
2
MC28C-BNC
8
2
BNC connectors instead of F-connectors
MC28U
8
2
Integrated upconverter
MC28X
8
2
Features dedicated media access control
(MAC) layer hardware.
OIR of Cable Interface Line Cards
Technically, the Cisco uBR7200 series universal broadband routers support true online insertion and
removal (OIR), or "hot swapping" of cable interface line cards only when exchanging cable interface line
cards of the exact same type (for example, exchanging a Cisco uBR-MC28U card for another
Cisco uBR-MC28U card). Under these conditions, no reload of the router is required.
Caution
When you OIR different types of cable interface line cards (for example, a Cisco uBR-MC16C card
replaced by a Cisco uBR-MC16S card, or Cisco uBR-MC16C card replaced by a Cisco uBR-MC28U
card), you not only might have to reconfigure the interfaces, you must reload the router.
Port Adapter Cards
Table 5 lists and describes the port adapters supported by Cisco uBR7200 series routers in
Cisco IOS Release 12.3(23)BC6.
Note
Table 5 identifies some port adapters for the Cisco uBR7200 series routers that are in an end-of-life
(EOL) stage. See the following product bulletin for more details on these EOL port adapters:
http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_eol_notices_list.html.
Note
Not all Cisco uBR7200 series routers support all port adapters. Some port adapters must be at certain
revision levels to be used in the Cisco uBR7246VXR router.
Table 5
Cisco uBR7200 Series Port Adapter Releases
Product Number
Cisco uBR7223
Cisco uBR7246 Cisco uBR7246VXR End-of-Life
PA-4E—4-port Ethernet
10BASE-T port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-8E—8-port Ethernet
10BASE-T port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
Ethernet
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
16
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System Requirements
Table 5
Cisco uBR7200 Series Port Adapter Releases (continued)
Product Number
Cisco uBR7223
Cisco uBR7246 Cisco uBR7246VXR End-of-Life
PA-FE-TX—1-port 100BASE-TX 12.2(4)XF1
Fast Ethernet port adapter
12.2(4)XF1
12.2(4)XF1
No
PA-FE-FX—1-port 100BASE-FX
Fast Ethernet port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-2FEISL-TX—2-port
100BASE-TX Fast Ethernet port
adapter with Inter-Switch Link
(ISL) support
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
PA-2FEISL-FX—2-port
100BASE-FX Fast Ethernet port
adapter with ISL support
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
Not applicable
No
PA-12E/2FE—12-port 10BASE-T Not applicable 12.2(4)XF1
and 2-port 10/100BASE-TX port
adapter
PA-2FE-TX—2-port
100BASE-TX Fast Ethernet port
adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-2FE-FX—2-port
100BASE-FX Fast Ethernet port
adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
Not applicable Not applicable 12.2(4)XF1
No
PA-4T+—4-port synchronous
serial port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-8T-232—8-port EIA/TIA-232
synchronous serial port adapter
12.2(4)XF1
12.2(4)XF1
Not applicable
Yes
PA-8T-V35—8-port V.35
synchronous serial port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-8T-X21—8-port X.21
synchronous serial port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
PA-4E1G-75—4-port unbalanced
(75-ohm) E1-G.703/G.704
synchronous serial port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
PA-4E1G-120—4-port balanced
(120-ohm) E1-G.703/G.704
synchronous serial port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
PA-E3—1-port high-speed serial
E3 interface port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-T3—1-port T3 serial interface 12.2(4)XF1
port adapter
12.2(4)XF1
12.2(4)XF1
No
Gigabit Ethernet
PA-GE—1-port, full-duplex,
IEEE 802.3z-compliant Gigabit
Ethernet (GE) port adapter1
Serial
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
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System Requirements
Table 5
Cisco uBR7200 Series Port Adapter Releases (continued)
Product Number
Cisco uBR7223
Cisco uBR7246 Cisco uBR7246VXR End-of-Life
PA-T3+—1-port T3 serial
interface port adapter enhanced
12.2(4)BC1
Not applicable 12.2(4)BC1
No
PA-2E3—2-port high-speed serial 12.2(4)XF1
E3 interface port adapter
12.2(4)XF1
12.2(4)XF1
No
PA-2T3—2-port T3 serial
interface port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-2T3+—2-port T3 serial
interface port adapter enhanced
12.2(4)BC1
Not applicable 12.2(4)BC1
No
PA-MC-T3—1-port T3
(channelized into 28 independent
T1 data lines) port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-MC-2T1—2-port multichannel 12.2(4)XF1
DS1 Integrated Services Digital
Network (ISDN) Primary Rate
Interface (PRI) single-wide port
adapter
12.2(4)XF1
12.2(4)XF1
Yes
PA-MC-4T1—4-port multichannel 12.2(4)XF1
DS1 ISDN PRI single-wide port
adapter
12.2(4)XF1
12.2(4)XF1
No
PA-MC-8E1/120—8-port
multichannel E1 ISDN PRI
single-wide port adapter
12.2(4)XF1
12.2(4)XF1
Not applicable
Yes
PA-MC-8T1—8-port multichannel 12.2(4)XF1
DS1 ISDN PRI single-wide port
adapter
12.2(4)XF1
12.2(4)XF1
Yes
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
PA-2H—2-port HSSI port adapter 12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-MC-2E1/120—2-port
multichannel E1 ISDN PRI
single-wide port adapter
HSSI
PA-H—1-port HSSI port adapter
ATM
PA-A1-OC3SMI—1-port ATM
OC-3c/STM-1 single-mode
intermediate reach port adapter
12.2(4)XF1
12.2(4)XF1
Not applicable
No
PA-A1-OC3MM—1-port ATM
OC-3c/STM-1 multimode port
adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
Yes
PA-A2-4E1XC-OC3SM—5-port
ATM CES2 (4 E1 120-ohm CBR3
ports and 1 OC-3 ATM
single-mode port) port adapter
Not applicable 12.2(4)XF1
Not applicable
Yes
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
18
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System Requirements
Table 5
Cisco uBR7200 Series Port Adapter Releases (continued)
Product Number
Cisco uBR7223
Cisco uBR7246 Cisco uBR7246VXR End-of-Life
PA-A2-4E1XC-E3ATM—5-port
ATM CES2 (4 E1 120-ohm CBR3
ports and 1 E3 ATM port) port
adapter
Not applicable 12.2(4)XF1
Not applicable
Yes
Not applicable 12.2(4)XF1
PA-A2-4T1C-OC3SM—5-port
ATM CES2 (4 T1 CBR3 ports and 1
OC-3 ATM single-mode port) port
adapter
Not applicable
Yes
PA-A2-4T1C-T3ATM—5-port
Not applicable 12.2(4)XF1
ATM CES2 (4 T1 CBR3 ports and 1
T3 ATM port) port adapter
Not applicable
Yes
PA-A3-E3—1-port E3 ATM,
PCI-based port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-A3-T3—1-port T3 ATM,
PCI-based port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-A3-OC3MM—1-port OC-3c
ATM, PCI-based multimode port
adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-A3-OC3SMI—1-port OC-3c
ATM, PCI-based single-mode
intermediate reach port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
No
PA-A3-OC3SML—1-port OC-3c 12.2(4)XF1
ATM, PCI-based single-mode long
reach port adapter
12.2(4)XF1
12.2(4)XF1
No
PA-A3-8T1IMA—ATM inverse
12.2(4)XF1
multiplexer over ATM port adapter
with 8 T1 ports
12.2(4)XF1
12.2(4)XF1
No
PA-POS-OC3SML—1-port POS
12.2(4)XF1
OC-3 single-mode, long reach port
adapter
12.2(4)XF1
12.2(4)XF1
Yes
PA-POS-OC3SMI—1-port OC-3
single-mode, intermediate reach
port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
PA-POS-OC3MM—1-port POS
OC3 multimode port adapter
12.2(4)XF1
12.2(4)XF1
12.2(4)XF1
PA-SRP-OC12SML—2-port
Not applicable 12.2(4)XF1
OC-12c (STM4c) single-mode
fiber, long reach DPT port adapter
12.2(4)XF1
Not applicable 12.2(4)XF1
PA-SRP-OC12SMI—2-port
OC-12c (STM4c) single-mode
fiber, intermediate reach DPT port
adapter
12.2(4)XF1
Packet-Over-SONET (POS)
Yes
Dynamic Packet Transport (DPT)
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Feature Support
Table 5
Cisco uBR7200 Series Port Adapter Releases (continued)
Product Number
Cisco uBR7223
Cisco uBR7246 Cisco uBR7246VXR End-of-Life
PA-SRP-OC12SMX—2-port
OC-12c (STM4c) single-mode
fiber, extended reach DPT port
adapter
Not applicable 12.2(4)XF1
12.2(4)XF1
PA-SRP-OC12MM—2-port
Not applicable 12.2(4)XF1
OC-12c (STM4c) multimode fiber
DPT port adapter
12.2(4)XF1
Yes
1. The Gigabit Ethernet port adapter must be combined with the appropriate optical fiber cable and a Gigabit Interface Converter
(GBIC).
2. CES = circuit emulation services.
3. CBR = constant bit rate.
Determining Your Software Release
To determine the version of Cisco IOS software running on the Cisco uBR7200 series universal
broadband router, log in to the router and enter the show version EXEC command:
Router> show version
Cisco Internetwork Operating System Software
IOS (tm) 12.3 BC Software (ubr7200-is-mz), Version 12.3(23)BC6, RELEASE SOFTWARE
Upgrading to a New Software Release
For general information about upgrading to a new software release, see Cisco IOS Upgrade Ordering
Instructions located at: http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/957_pp.htm.
Feature Support
Cisco IOS software is packaged in feature sets that consist of software images that support specific
platforms. The feature sets available for a specific platform depend on which Cisco IOS software images
are included in a release. Each feature set contains a specific set of Cisco IOS features.
Caution
Cisco IOS images with strong encryption (including, but not limited to 168-bit (3DES) data encryption
feature sets) are subject to U.S. government export controls and have limited distribution. Strong
encryption images to be installed outside the United States are likely to require an export license.
Customer orders may be denied or subject to delay because of U.S. government regulations. When
applicable, the purchaser/user must obtain local import and use authorizations for all encryption
strengths. Please contact your sales representative or distributor for more information, or send an e-mail
to [email protected].
The feature set tables have been removed from the Cisco IOS Release 12.3 release notes to improve the
usability of the release notes documentation. The feature-to-image mapping that was provided by the
feature set tables is available through Cisco Feature Navigator.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
20
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Feature Support
Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software
images support a specific set of features and which features are supported in a specific Cisco IOS image.
You can search by feature or by feature set (software image). Under the release section, you can compare
Cisco IOS software releases side by side to display both the features unique to each software release and
the features that the releases have in common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or
lost your account information, send a blank e-mail to [email protected]. An automatic check
will verify that your e-mail address is registered with Cisco.com. If the check is successful, account
details with a new random password will be e-mailed to you. Qualified users can establish an account
on Cisco.com by following the directions found at this URL:
http://www.cisco.com/web/siteassets/account/index.html
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology
releases occur. For the most current information, go to the Cisco Feature Navigator home page at the
following URL:
http://www.cisco.com/go/fn
For frequently asked questions about Cisco Feature Navigator, see the FAQs at the following URL:
http://www.cisco.com/support/FeatureNav/FNFAQ.html
Determining Which Software Images (Feature Sets) Support a Specific Feature
To determine which software images (feature sets) in Cisco IOS Release 12.3 support a specific feature,
go to the Cisco Feature Navigator home page, enter your Cisco.com login, and perform the following
steps:
Step 1
From the Cisco Feature Navigator home page, click Feature.
Step 2
To find a feature, use either “Search by full or partial feature name” or “Browse features in alphabetical
order.” Either a list of features that match the search criteria or a list of features that begin with the
number or letter selected from the ordered list will be displayed in the text box on the left side of the
web page.
Step 3
Select a feature from the left text box, and click the Add button to add a feature to the Selected Features
text box on the right side of the web page.
Note
To learn more about a feature in the list, click the Description button below the left box.
Repeat this step to add additional features. A maximum of 20 features can be chosen for a single search.
Step 4
Click Continue when you are finished selecting features.
Step 5
From the Major Release drop-down menu, choose 12.3.
Step 6
From the Release drop-down menu, choose the appropriate maintenance release.
Step 7
From the Platform Family drop-down menu, select the appropriate hardware platform. The “Your
selections are supported by the following:” table will list all the software images (feature sets) that
support the feature(s) that you selected.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
21
New and Changed Information
Determining Which Features Are Supported in a Specific Software Image (Feature Set)
To determine which features are supported in a specific software image (feature set) in Cisco IOS
Release 12.3, go to the Cisco Feature Navigator home page, enter your Cisco.com login, and perform
the following steps:
Step 1
From the Cisco Feature Navigator home page, click Compare/Release.
Step 2
In the “Find the features in a specific Cisco IOS release, using one of the following methods:” box,
choose 12.3 from the Cisco IOS Major Release drop-down menu.
Step 3
Click Continue.
Step 4
From the Release drop-down menu, choose the appropriate maintenance release.
Step 5
From the Platform Family drop-down menu, choose the appropriate hardware platform.
Step 6
From the Feature Set drop-down menu, choose the appropriate feature set. The “Your selections are
supported by the following:” table will list all the features that are supported by the feature set (software
image) that you selected.
New and Changed Information
The following sections list the new hardware and software features supported by the
Cisco uBR7200 series routers for Cisco IOS Release 12.3BC.
Tip
For information on these features, see the Cisco uBR7200 Series Software Configuration Guide, the
Cisco CMTS Feature Guide, and the Cisco Broadband Cable Command Reference Guide, as listed in the
“Related Documentation” section on page 354.
New Hardware Features in Cisco IOS Release 12.3(23)BC10
There are no new hardware features in Cisco IOS Release 12.3(23)BC10.
New Software Features in Cisco IOS Release 12.3(23)BC10
There are no new software features in Cisco IOS Release 12.3(23)BC10.
New Hardware Features in Cisco IOS Release 12.3(23)BC9
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC9.
New Software Features in Cisco IOS Release 12.3(23)BC9
There are no new software features supported in Cisco IOS Release 12.3(23)BC9.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
22
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New and Changed Information
Open Source Software Licenses for Cisco Universal Broadband Routers
Expat 1.1 is used in Cisco IOS Release 12.3(23)BC9, under the MPL 1.1 license. You can obtain the
source code for Expat 1.1 at the following URL.
ftp://ftp-eng/pub/opensource/ios/xpat_1.1.tar
For information on Open Source Software License MPL 1.1, refer to the following URL:
http://www.cisco.com/en/US/docs/cable/cmts/license/cable_licensing.html
New Hardware Features in Cisco IOS Release 12.3(21a)BC9
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC9.
New Software Features in Cisco IOS Release 12.3(21a)BC9
There are no new softwarefeatures supported in Cisco IOS Release 12.3(21a)BC9.
New Hardware Features in Cisco IOS Release 12.3(21a)BC9
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC9.
New Software Features in Cisco IOS Release 12.3(21a)BC9
There are no new softwarefeatures supported in Cisco IOS Release 12.3(21a)BC9.
New Hardware Features in Cisco IOS Release 12.3(23)BC8
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC8.
New Software Features in Cisco IOS Release 12.3(23)BC8
There are no new softwarefeatures supported in Cisco IOS Release 12.3(23)BC8.
New Hardware Features in Cisco IOS Release 12.3(23)BC7
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC7.
New Software Features in Cisco IOS Release 12.3(23)BC7
The following software features are new in Cisco IOS Release 12.3(23)BC7.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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23
New and Changed Information
Enhanced Show Tech
A new keyword, cmts, has been added to the show tech-support command to provide debugging
information specific to a cable interface or a modem for the following universal broadband routers:
•
Cisco uBR10012 router
•
Cisco uBR7200 series
•
Cisco uBR7225VXR router
For details about this command, see the Cisco IOS CMTS Cable Command Reference at the following
URL:
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_19_show_m_to_show_z.html
Cable Modem QoS Information
A new command, show cable modem service-flow, is introduced to provide information about all service
flows associated with a particular modem.
For details about this command, see the Cisco IOS CMTS Cable Command Reference at the following
URL:
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_16_show_cable_m_to_show_cabl
e_u.html
Direct Load for Cable Modems
A new command, cable upstream equalization-error-recovery, is introduced to enable the CMTS to send
Type-Length-Value (TLV) Type 9 in the DOCSIS RNG-RSP MAC management messages. The TLV
Type 9 helps CMs come online if the TLV Type 4 convolved method causes CMs to go offline.
For details about this command, see the Cisco IOS CMTS Cable Command Reference at the following
URL:
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_10_cable_u_to_cable_w.html
Three Step Dynamic Modulation
Cisco IOS Release 12.3(33)BC7 introduces Three Step Dynamic Modulation, which allows you to create
and use a third modulation profile in the Dynamic Upstream Modulation feature, as against the existing
16-QAM and quadrature phase-shift keying (QPSK) modulation profiles. The feature now permits
64-QAM based modulation profile to increase the upstream throughput and to satisfy the demand for
new spectrum management.
The 64-QAM modulation profile is a more bandwidth-efficient modulation scheme and has a higher
throughput than the other two modulation profiles.
For more details on Three Step Dynamic Modulation and the Dynamic Upstream Modulation feature,
refer to Spectrum Management and Advanced Spectrum Management for the Cisco CMTS guide at the
following location: http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_spec.html
The Cisco IOS Release 12.3(23)BC7 introduces or modifies the following commands:
The cable upstream threshold hysteresis command was introduced to allow configurable hysteresis
values for spectrum management channel upgrade thresholds.
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The cable upstream modulation command was enhanced to accept up to three profiles, instead of the
existing two.
The show cable hop history command was enhanced to display the modulation profile number when a
change occurs.
New Hardware Features in Cisco IOS Release 12.3(23)BC6
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC6.
New Software Features in Cisco IOS Release 12.3(23)BC6
There are no new software features supported in Cisco IOS Release 12.3(23)BC6.
New Hardware Features in Cisco IOS Release 12.3(23)BC5
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC5.
New Software Features in Cisco IOS Release 12.3(23)BC5
The following command is modified in Cisco IOS Release 12.3(23)BC5:
•
show cable logging
The command output was modified to display the linecard’s CPU revision number.
New Hardware Features in Cisco IOS Release 12.3(23)BC4
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC4.
New Software Features in Cisco IOS Release 12.3(23)BC4
There are no new software features supported in Cisco IOS Release 12.3(23)BC4.
New Hardware Features in Cisco IOS Release 12.3(21a)BC8
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC8.
New Software Features in Cisco IOS Release 12.3(21a)BC8
There are no new software features supported in Cisco IOS Release 12.3(21a)BC8.
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New Hardware Featues in Cisco IOS Release 12.3(23)BC3
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC3.
New Software Features in Cisco IOS Release 12.3(23)BC3
There are no new software features supported in Cisco IOS Release 12.3(23)BC3.
New Hardware Features in Cisco IOS Release 12.3(23)BC2
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC2.
New Software Features in Cisco IOS Release 12.3(23)BC2
The following software features are new in Cisco IOS Release 12.3(23)BC2.
Subscriber Traffic Management Version 1.2
The STM feature enables service providers to identify and control subscribers who exceed the maximum
bandwidth allowed under their registered quality of service (QoS) profiles. STM works as a low CPU
alternative to Network-Based Application Recognition (NBAR) and access control lists (ACLs),
however, using STM does not mean that NBAR and ACLs have to be turned off; STM can be applied
along with NBAR and ACLs. STM also works in conjunction with the Cisco Broadband Troubleshooter
to support additional network management and troubleshooting functions in the Cisco CMTS.
The STM Version 1.2 feature is enhanced in Cisco IOS Release 12.3(23)BC2 with the following support
on the Cisco uBR7246VXR and Cisco uBR10012 Universal Broadband Routers:
•
Support was added for the Cisco Wideband SPA (Cisco uBR10012 router only).
•
Support for suspension of the cable modem (CM) penalty period at a certain time of day.
•
Support for weekday and weekend traffic monitoring.
•
Support of up to 40 total enforce rules.
•
Support for service providers to change subscriber service classes for a particular modem using the
cable modem service-class-name command.
Addition of the following SNMP objects to the CISCO-CABLE-QOS-MONITOR-MIB:
•
ccqmCmtsEnfRulePenaltyEndTime
•
ccqmCmtsEnfRuleWkndOff
•
ccqmCmtsEnfRuleWkndMonDuration
•
ccqmCmtsEnfRuleWkndAvgRate
•
ccqmCmtsEnfRuleWkndSampleRate
•
ccqmCmtsEnfRuleWkndFirstPeakTime
•
ccqmCmtsEnfRuleWkndFirstDuration
•
ccqmCmtsEnfRuleWkndFirstAvgRate
•
ccqmCmtsEnfRuleWkndSecondPeakTime
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•
ccqmCmtsEnfRuleWkndSecondDuration
•
ccqmCmtsEnfRuleWkndSecondAvgRate
•
ccqmCmtsEnfRuleWkndOffPeakDuration
•
ccqmCmtsEnfRuleWkndOffPeakAvgRate
•
ccqmCmtsEnfRuleWkndAutoEnforce
The following commands are new or modified:
•
cable modem service-class-name
•
penalty-period
•
show cable qos enforce-rule verbose
•
weekend duration
•
weekend off
•
weekend peak-time1
For detailed information about this feature, see the Subscriber Traffic Management on the Cisco CMTS
Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_sbsbr_tfmgt.html
Upstream Utilization Optimization
The Upstream (US) Utilization Optimization feature on the Cisco Cable Modem Termination System
(CMTS) routers provides higher upstream throughput. It provides the following benefits and functions
on a Cisco CMTS router:
•
Group configuration mode enables rate-adapt eligibility on all cable modem upstream flows.
•
Local configuration mode enables rate-adapt eligibility on a specific upstream, provides
configuration of selective parameters, and provides that local configuration overrides any global
configuration.
The following commands are new or modified:
•
cable upstream rate-adapt (global)
•
cable upstream rate-adapt (interface)
•
show cable rate-adapt
•
show interface cable sid
•
show interface cable upstream
For detailed information about this feature, see the Upstream Utilization Optimization on the Cisco
CMTS Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_upstream_rate_adapt.html
New Hardware Features in Cisco IOS Release 12.3(21a)BC7
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC7.
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New Software Features in Cisco IOS Release 12.3(21a)BC7
There are no new software feature supported in Cisco IOS Release 12.3(21a)BC7.
New Hardware Features in Cisco IOS Release 12.3(23)BC1
There are no new hardware features supported in Cisco IOS Release 12.3(23)BC1.
New Software Features in Cisco IOS Release 12.3(23)BC1
The following software feature is new in Cisco IOS Release 12.3(23)BC1.
PacketCable Subscriber ID Support
Subscriber ID is added to all Gate Control messages and enhances error codes returned from the Cable
Modem Termination System (CMTS).
Previously, the Gate ID was unique only to individual CMTS systems, with the CMTS proxying all CMS
(Call Management Server) Gate control messaging through a central device which manages the CMTS
connections on the behalf of the CMS. The CMS had a single Common Open Policy Service (COPS)
association to the proxy device. Therefore, the Gate IDs could be duplicated when using multiple CMTS
systems.
The new PacketCable Subscriber ID feature adds a Subscriber ID to each Gate Control message to
disambiguate the Gate IDs between the CMS and proxy device. The Subscriber ID parameter is added
to the following COPS messages:
•
GATE-INFO
•
GATE-DELETE
•
GATE-OPEN
•
GATE-CLOSE
The Subscriber ID is available at the CMS and is used in the Gate-Set messages. Additionally, the error
codes returned from CMTS or its proxy are enhanced to include more specific information about gate
operation failures.
To enable this feature, a new command is introduced: packetcable gate send-subscriberID used in
global configuration mode. For more information, see the Cisco IOS CMTS Cable Command Reference
Guide.
New Hardware Features in Cisco IOS Release 12.3(21a)BC6
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC6.
New Software Features in Cisco IOS Release 12.3(21a)BC6
There are no new software features supported in Cisco IOS Release 12.3(21a)BC6.
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New Hardware Features in Cisco IOS Release 12.3(21a)BC5
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC5.
New Software Features in Cisco IOS Release 12.3(21a)BC5
There are no new software features supported in Cisco IOS Release 12.3(21a)BC5.
New Hardware Features in Cisco IOS Release 12.3(23)BC
The following software features are new in Cisco IOS Release 12.3(21)BC:
DOCSIS Timing & Control Card (DTCC)
On the Cisco uBR10012 universal broadband router, the DOCSIS Timing & Control Card (DTCC) acts
as a secondary processor that performs the following functions:
•
In the default DTI mode, a 10.24 MHz clock and 32-bit DOCSIS timestamp are generated by the
DTI Server, propagated to DTI client using DTI protocol, and distributed by DTI client to each cable
interface line card.
•
Allows software to independently power off any or all cable interface line cards.
•
Drives the LCD panel used to display system configuration and status information.
•
Monitors the supply power usage of the chassis.
•
Two RJ-45 cables with the DTI server, which, in turn, can generate the clock using its own oscillator
or external timing reference inputs such as GPS or network clock.
When two DTCC cards are installed, they are configured as active (primary) and backup (redundant). If
the DTCC card in the first slot is working at system power-up, it automatically becomes the active card
and the DTCC card in the second slot becomes the backup card. The DTCC cards monitor each other’s
priority information, so that if the active card fails, the active card role is transferred to the redundant
backup card without loss of data.
Each DTCC card contains two RJ-45 connectors labeled Primary and Secondary, on the front panel. See
Xref_Colorparanum[FC_FigureCap,FCW_FigureCapW]on page *. These connectors are for a primary
and secondary (redundant) Stratum 3 external clock reference source that is traceable to a Stratum 1
clock source. The external reference source allows the Cisco uBR10012 router’s reference clock to be
synchronized to the Stratum 1 clock source, providing a free-running DOCSIS-quality clock reference
and time stamp to the cable interface line cards.
If present, the primary DTI link is used. If it is lost, the secondary DTI link (if present) on the active
DTCC card is used. If the active DTCC card stops functioning, control is transferred to the backup
DTCC card, which then uses its primary and secondary clock reference sources. If neither card has a
valid clock reference source, In DTI mode, all M-CMTS elements should have common timing source.
The internal clock of DTI client cannot be used to provide DOCSIS clock and timestamp. High
availability strategies (active/backup card, active/backup ports) should be used to prevent loss of
common timing source.
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New Software Features in Cisco IOS Release 12.3(23)BC
There are no new software features supported in Cisco IOS Release 12.3(23)BC.
New Hardware Features in Cisco IOS Release 12.3(21a)BC4
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC4.
New Software Features in Cisco IOS Release 12.3(21a)BC3
There are no new software features supported in Cisco IOS Release 12.3(21a)BC4.
New Hardware Features in Cisco IOS Release 12.3(21a)BC3
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC3.
New Software Features in Cisco IOS Release 12.3(21a)BC3
The following software features are new in Cisco IOS Release 12.3(21a)BC3:
Control Point Discovery (CPD)
The Control Point Discovery (CPD) can be used to discover the IP address of a control point between
the requestor and a media endpoint. It can be used by CMS (call management server), DF (delivery
function for CALEA), or PS (policy server for Packetcable multimedia) to discover the IP address of the
CMTS connected to the media endpoint. The CMTS needs to interpret and respond to the CPD messages.
New Hardware Features in Cisco IOS Release 12.3(21a)BC2
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC2.
New Software Features in Cisco IOS Release 12.3(21a)BC2
There are no new software features supported in Cisco IOS Release 12.3(21a)BC2.
New Hardware Features in Cisco IOS Release 12.3(21a)BC1
There are no new hardware features supported in Cisco IOS Release 12.3(21a)BC1.
New Software Features in Cisco IOS Release 12.3(21a)BC1
There are no new software features supported in Cisco IOS Release 12.3(21a)BC1.
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New Hardware Features in Cisco IOS Release 12.3(21)BC
There are no new hardware features supported in Cisco IOS Release 12.3(21)BC.
New Software Features in Cisco IOS Release 12.3(21)BC
The following software features are new in Cisco IOS Release 12.3(21)BC:
Automatic Virtual Interface Bundles
All cable bundles are now automatically converted and configured to be in a virtual bundle, and
standalone cable interfaces must be manually configured to be in a virtual bundle to operate properly.
Previously, new virtual interface bundles and bundle members required reconfiguration, and there could
also be standalone interfaces not part of a bundle at all.
The following guidelines describe the automatic virtual interface bundling:
•
The former rules for bundle master are applicable to the new virtual bundle interface.
•
The former rules for bundle slaves are applicable to the new virtual bundle members.
•
All cable bundles are automatically converted and configured to be in a virtual bundle after loading
the software image.
•
The virtual bundle interface accumulates the counters from members; counters on member links are
not cleared when they are added to the bundle. If a bundle-only counter is desired, clear the bundle
counter on the members before loading the image.
•
A maximum of 40 virtual interface bundles are supported, with the numeric range from 1 to 255.
•
The virtual bundle interface remains configured unless specifically deleted, even if all members in
the bundle are deleted.
•
This feature supports subinterfaces on the virtual bundle interface.
•
Bundle-aware configurations are supported on the virtual bundle interface.
•
Bundle-unaware configurations are supported on each bundle member.
•
If the bundle interface existed in earlier Cisco IOS releases, the earlier cable configurations
re-appear after upgrade.
For more information, see the “Cable Interface Bundling and Virtual Interface Bundling for the
Cisco CMTS” chapter in the Cisco CMTS Feature Guide.
Cable DHCP Enhancements
When using an external DHCP server, the Cisco CMTS supports a number of options that can enhance
operation of the cable network in certain applications.
Dynamic Cable Helper Address Selection
The cable helper-address command has been expanded to further specify where to forward DHCP
packets based on origin: from a cable modem, MTA, STB, or other cable devices:
cable helper-address address [ cable-modem | host | mta | stb ]
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This enables load-balancing of DHCP requests from cable modems and CPE devices by specifying
different DHCP servers according to the cable interface or subinterface. You can also specify separate
servers for cable modems and CPE devices.
When the mta or stb option is used, you must also use the cable dhcp-parse option-optnum command to parse
the DHCP options.
If you specify only one option, the other types of devices (cable modem, host, mta, or stb) will not be
able to connect with a DHCP server. You must specify each desired option in a separate command.
You may specify more than one helper address on each cable interface by repeating the command. You
can specify more than 16 helper addresses, but the Cisco IOS software uses only the first 16 valid
addresses.
If you do not specify an option, the helper-address will support all cable devices, and the associated
DHCP server will accept DHCP packets from all cable device classes.
Cable Node Location Reporting
The DHCP Relay Agent can now be used to identify cloned modems or gather geographical information
for E911 and other applications. Using the cable dhcp-insert command, users configure the CMTS to
insert downstream, upstream, or hostname descriptors into DHCP packets:
cable dhcp-insert {downstream-description | hostname | upstream-description}
A DHCP server can then utilize such information to detect cloned modems or extract geographical
information. Multiple types of strings can be configured as long as the maximum relay information
option size is not exceeded.
Multiple types of descriptor strings can be configured as long as the maximum relay information option
size is not exceeded.
show cable modem docsis device-class
The show cable modem docsis device-class command is now supported.
For more information on these enhancements and related commands, see theCisco Broadband Cable
Command Reference Guide and the "DHCP, ToD, and TFTP Services for the Cisco Cable Modem
Termination System" chapter in the Cisco CMTS Feature Guide.
Cable Duplicate MAC Address Reject
Cisco IOS Release 12.3(21)BC introduces a DOCSIS 1.1-compliant and above security enhancement
that helps to eliminate denial-of-service (DOS) attacks that are caused by cloned cable modems. A clone
is presumed to be one of two physical cable modems on the same Cisco CMTS chassis with the same
HFC interface MAC address. The cloned cable modem may be DOCSIS 1.0 or greater, and may be
semi-compliant or non-compliant with portions of the DOCSIS specifications.
This feature is enabled by default on the Cisco CMTS, and has no associated command-line interface
(CLI) configuration commands. This feature creates a new log message. By default, this message
appears in the syslog, but may be moved into the cable layer2 event log using the configuration command
cable logging layer2events.
For additional information about this feature, its causes, and the introduction of the new
cable privacy bpi-plus-enforce command, which enforces DOCSIS 1.1 BPI+ on the cable network,
refer to the following documents on Cisco.com and the Internet:
•
Cable Duplicate MAC Address Reject for the Cisco CMTS
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http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/cmtsfg.html
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
PacketCable Client Accept Timeout
Cisco IOS Release 12.3(21)BC introduces support for setting timeout values for COPS Telnet
connections on the Cisco CMTS, and for clearing COPS telnet sessions.
Network or Cisco CMTS telnet errors can cause incomplete COPS sessions to be created. This new
timeout timer enables the clearing and cleaning of allocated resources for the stale COPS Telnet sessions
on the Cisco CMTS. This feature supports COPS for PacketCable on the Cisco CMTS.
If the Connection between a PacketCable CMS and the Cisco CMTS is not completely established, and
the PacketCable CMS does not correctly terminate the session by sending a TCP FIN message, the
connection otherwise shows a COPS server in the output of the show cops server command.
The timeout timer applies to each COPS Telnet connection on the Cisco CMTS, and expiration of this
timeout setting triggers the termination of the Telnet session and clears supporting resources on the
Cisco CMTS.
To set the timeout timer for Telnet COPS sessions on the Cisco CMTS, use the following command in
global configuration mode. To remove this timeout timer, use the no form of this command.
packetcable timer client-accept seconds
no packetcable timer client-accept seconds
Syntax Description
seconds
The timeout value in seconds, beyond which the Telnet COPS session is
terminated, and associated resources on the Cisco CMTS are cleared.
Range from 300 seconds (five minutes) to 1800 seconds (30 minutes).
To clear all COPS Telnet sessions and associated resources on the Cisco CMTS, use the following
command in global configuration mode:
clear cops connection
For additional information, refer to the following documents on Cisco.com:
•
PacketCable and PacketCable MultiMedia for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_pkcb.html.
•
COPS Engine Operation on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cops.html
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
Per Downstream Static Multicast
The IOS IGMP Static-Group feature was first introduced back in Release 11.2, while the Source Specific
Multicast (SSM) extension was added in Release 12.0(6)T. This allows network administrators to
configure the router to be a statically connected member of the specified group on the interface. All
multicast traffic destined to that particular group will be forwarded out on that configured interface.
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Beginning in Cisco IOS Release 12.3(21)B, the Cisco uBR10012 universal broadband router supports
the Per Downstream Static Multicast feature. This feature provides several multicast enhancements and
makes it possible to control the replication of static IP multicast streams within a cable bundle using the
cable igmp static-group command on the physical cable downstream interface.
For additional information, refer to the following documents on Cisco.com:
Advanced-mode DOCSIS Set-Top Gateway 1.1 for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubradsg.html
SAMIS Source Address Management
Cisco IOS Release 12.3(21)BC introduces Subscriber Account Management Interface Specification
(SAMIS) enhancements which will provide the ability to set the source of the usage based billing packets
originated by the router using the cable metering command. This enables the ip address to be set as the
source of the loopback interface, similar to what is done for telnet or ftp (ip ftp source-interfacelo0).
For additional information about Subscriber Account Management Interface Specification (SAMIS),
refer to the following document on Cisco.com:
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubrsamis.html
Service Flow Admission Control
Cisco IOS Release 12.3(21)BC introduces Service Flow Admission Control (SFAC) on the Cisco Cable
Modem Termination System.
SFAC on the Cisco CMTS is a mechanism that gracefully manages service flow admission requests when
one or more resources are not available to process and support the incoming service request. Lack of
such a mechanism not only causes the new request to fail with unexpected behavior but could potentially
cause the flows that are in progress to have quality related problems. SFAC monitors such resources
constantly, and accepts or denies requests depending on the resource availability.
SFAC enables you to provide a reasonable guarantee about the Quality of Service (QoS) to subscribers
at the time of call admission, and to enable graceful degradation of services when resource consumption
approaches critical levels. SFAC reduces the impact of unpredictable traffic demands in circumstances
that would otherwise produce degraded QoS for subscribers.
SFAC uses two event types for resource monitoring and management—cable modem registration and
dynamic service (voice call) requests. When either of these two events occurs on the Cisco CMTS, SFAC
verifies that the associated resources conform to the configured limits prior to admitting and supporting
the service call request.
SFAC is not a mechanism to apply QOS to the traffic flows. Scheduling and queuing are some of the
mechanisms used for implementing the QOS. The QOS is applied on per packet basis. SFAC checks are
performed before the flow is admitted.
SFAC in Cisco IOS Release 12.3(21)BC monitors the following resources on the Cisco CMTS.
•
CPU utilization—SFAC monitors CPU utilization on the Cisco CMTS, and preserves QoS for
existing service flows when new traffic would otherwise compromise CPU resources on the Cisco
CMTS.
•
Memory resource utilization (I/O, Processor, and combined total)—SFAC monitors one or both
memory resources and their consumption, and preserves QoS in the same way as with CPU
utilization.
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•
Bandwidth utilization for upstream and downstream—SFAC monitors upstream and downstream
bandwidth utilization, and associated service classes, whether for data or dynamic service traffic.
For complete configuration and operation information, refer to the following documents on Cisco.com:
•
Service Flow Admission Control for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_sfac.html
•
Cisco CMTS MIB Specifications Guide
http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_technical_reference_list.html
New Hardware Features in Cisco IOS Release 12.3(17b)BC9
There are no new hardware features supported in Cisco IOS Release 12.3(17b)BC9.
New Software Features in Cisco IOS Release 12.3(17b)BC9
There are no new software features supported in Cisco IOS Release 12.3(17b)BC9.
New Hardware Features in Cisco IOS Release 12.3(17b)BC8
There are no new hardware features supported in Cisco IOS Release 12.3(17b)BC8.
New Software Features in Cisco IOS Release 12.3(17b)BC8
There are no new software features supported in Cisco IOS Release 12.3(17b)BC8.
New Hardware Features in Cisco IOS Release 12.3(17b)BC7
There are no new hardware features supported in Cisco IOS Release 12.3(17b)BC7.
New Software Features in Cisco IOS Release 12.3(17b)BC7
There are no new software features supported in Cisco IOS Release 12.3(17b)BC7.
New Hardware Features in Cisco IOS Release 12.3(17b)BC6
There are no new hardware features supported in Cisco IOS Release 12.3(17b)BC6.
New Software Features in Cisco IOS Release 12.3(17b)BC6
There are no new software features supported in Cisco IOS Release 12.3(17b)BC6.
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New Hardware Features in Cisco IOS Release 12.3(17b)BC5
There are no new hardware features supported in Cisco IOS Release 12.3(17b)BC5.
New Software Features in Cisco IOS Release 12.3(17b)BC5
There are no new software features supported in Cisco IOS Release 12.3(17b)BC5.
New Hardware Features in Cisco IOS Release 12.3(17b)BC4
There are no new hardware features supported in Cisco IOS Release 12.3(17b)BC4.
New Software Features in Cisco IOS Release 12.3(17b)BC4
Cisco IOS Release 12.3(17b)BC4 introduces the following new features or enhancements:
Downstream Load Balancing Distribution with Upstream Load Balancing
Cisco IOS Release 12.3(17b)BC4 introduces further enhancements to downstream load balancing,
resulting in equalized upstream load balancing group members. This enhancement synchronizes the
pending statistic between different cable interface line cards in the load balancing group.
This enhancement performs downstream load balancing that accounts for loads on upstream channels in
the same upstream load balancing group, rather than on the basis of the entire downstream channel load.
Prior Cisco IOS releases may not have distributed cable modems evenly over individual upstream
channels, nor in a way that accounted for downstream and upstream segment loads that account for one
another.
This enhancement applies when downstream load balancing occurs on a headend system with separate
upstream load balancing segments; the upstream segments are spread over multiple downstreams
segments. This enhancement provides an alternative downstream load balancing scheme that accounts
and makes use of per-upstream loads rather than total downstream loads.
For additional information about Load Balancing on the Cisco CMTS, refer to the following documents
on Cisco.com:
•
Load Balancing and Dynamic Channel Change on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/troubleshooting_batch9/cmtslbg.html.
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
New Hardware Features in Cisco IOS Release 12.3(17b)BC3
There are no new hardware features supported in Cisco IOS Release 12.3(17b)BC3.
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New Software Features in Cisco IOS Release 12.3(17b)BC3
There are no new software features supported in Cisco IOS Release 12.3(17b)BC3.
New Hardware Features in Cisco IOS Release 12.3(17a)BC2
There are no new hardware features supported in Cisco IOS Release 12.3(17a)BC2.
New Software Features in Cisco IOS Release 12.3(17a)BC2
Cisco IOS Release 12.3(17a)BC2 introduces the following new features or enhancements:
Advanced-Mode DOCSIS Set-Top Gateway Issue 1.2
Cisco IOS Release 12.3(17a)BC2 introduces certified support for DOCSIS Set-Top Gateway (DSG)
Issue 1.2. Advanced-mode DSG Issue 1.2 introduces support for the latest DOCSIS Set-Top
specification from CableLabs™:
•
DOCSIS Set-top Gateway (DSG) Interface Specification
Advanced-mode DSG 1.2 is certified by CableLabs™, and is a powerful tool in support of latest industry
innovations. Advanced-mode DSG 1.2 offers substantial support for enhanced DOCSIS implementation
in the Broadband Cable environment. The set-top box dynamically learns the overall environment from
the Cisco Cable Modem Termination System (CMTS), to include MAC address, traffic management
rules, and classifiers. DSG 1.2 supports the DOCS-DSG-IF-MIB as one component of this functionality:
For additional information about this feature, refer to the following document on Cisco.com:
•
Advanced-mode DOCSIS Set-Top Gateway 1.2 for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubrdsg12.html.
For additional information about the DOCS-DSG-IF-MIB, feature, refer to the following document on
Cisco.com:
•
Cisco CMTS Universal Broadband Router MIB Specifications Guide, Rel 12.3(17a)BC2
http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_technical_reference_list.html
DOCSIS1.0 ToS Overwrite
Currently, type-of-service (ToS) overwrite requires the creation of static cable quality if service (QoS)
profiles, which are then assigned to the ToS fields. This implementation works well if only a few
different service types are offered. However, scalability issues arise when large numbers of service types
are presented; each requiring a static QoS profile in order to perform ToS overwrite.
The Default DOCSIS 1.0 ToS Overwrite feature eliminates the need to create multiple QoS profiles in
order to perform ToS overwrite by automatically bounding all DOCSIS 1.0 Cable Modem (CM) created
profiles to a default ToS overwrite.
New Hardware Features in Cisco IOS Release 12.3(17a)BC1
There are no new hardware features supported in Cisco IOS Release 12.3(17a)BC1:
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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New Software Features in Cisco IOS Release 12.3(17a)BC1
There are no new software features supported in Cisco IOS Release 12.3(17a)BC1.
New Hardware Features in Cisco IOS Release 12.3(17a)BC
There are no new hardware features supported in Cisco IOS Release 12.3(17a)BC.
New Software Features in Cisco OS Release 12.3(17a)BC
The Cisco IOS Release 12.3(17a)BC is the third major feature release in the Cisco 12.3 BC release train.
This release introduces the following new features or enhancements:
•
Cable Monitor Enhancements
•
Configurable Leasequery Server
•
Dynamic Channel Change (DCC) for Load Balancing
•
DOCSIS 2.0 SAMIS ECR Data Set
•
DSX Messages and Synchronized PHS Information
•
High Availability Support for Encrypted IP Multicast
•
IPv6 over L2VPN
•
Management Information Base (MIB) Changes and Enhancements
•
Pre-equalization Control for Cable Modems
•
show cable modem Command Changes
Cable Monitor Enhancements
Cisco IOS Release 12.3(17a)BC introduces the following enhancements to the cable monitor feature:
•
Access Control Lists are now supported on the Cisco uBR-MC5X20U/D and Cisco uBR-MC28U
cable interface line cards
•
Unconditional downstream sniffing now enables downstream packets to be monitored, either for
MAC or data packets. This enhancement supports both DOCSIS and Ethernet packet encapsulation.
For additional information about this enhancements to the cable monitor feature, refer to the following
documents on Cisco.com:
•
Cable Monitor and Intercept Features on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cmon.html.
Configurable Leasequery Server
Previously, lease query requests could only be sent to the Dynamic Host Configuration Protocol (DHCP)
server. Beginning with Cisco IOS Release 12.3(17a)BC, an alternate server may be configured to receive
the requests.
There are a few restrictions:
•
Lease queries are sent to the DHCP server unless an alternate server is configured.
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•
Only one alternate server may be configured.
•
Users are responsible for the synchronization of the DHCP server and configured alternate server.
•
If the configured alternate server fails, lease query requests will not be diverted back to the DHCP
server.
Regardless of which server is configured (DHCP or alternate), unknown IP addresses that are found in
packets for customer premises equipment (CPE) devices that use the cable modems on the cable interface
are verified. The DHCP server or configured alternate server returns a DHCP ACK message with the
MAC address of the CPE device that has been assigned this IP address, if any.
To configure the Cisco CMTS router to send DHCP LEASEQUERY requests to an alternate server, use
the cable source-verify dhcp server ipaddress and no cable arp commands. (To configure the DHCP
server instead, use the cable source-verify dhcp and no cable arp commands.)
For additional information about this feature, refer to the following documents on Cisco.com:
•
Filtering Cable DHCP Lease Queries on Cisco CMTS Routers
http://www.cisco.com/en/US/docs/cable/cmts/feature/cblsrcvy.html.
Dynamic Channel Change (DCC) for Load Balancing
Cisco IOS Release 12.3(17a)BC introduces Dynamic Channel Change (DCC) and DCC for Load
Balancing on the Cisco CMTS.
DCC in DOCSIS 1.1 dynamically changes cable modem upstream or downstream channels without
forcing a cable modem to go offline, and without re-registration after the change. DCC supports four
different initializations, instead of one, as in earlier DOCSIS support.
DCC and DCC for load balancing is supported on the Cisco uBR7246VXR router with distributed cable
interface line cards, including the Cisco MC28U and the Cisco MC5X20S/U/H.
•
Load Balancing techniques allow for moving cable modems with DCC by using configurable
initialization techniques.
•
DCC allows line card channel changes across separate downstream channels in the same cable
interface line card, with the DCC initialization techniques ranging from 0 to 4.
•
DCC transfers cable modem state information from the originating downstream channel to the target
downstream channel, and maintains synchronization of the cable modem information between the
cable interface line card and the Network Processing Engine (NPE) or Route Processor (RP).
•
When the target channel is in ATDMA mode, only DOCSIS 2.0-capable modems can be
successfully load balanced. (Only DOCSIS 2.0-capable modems can operate on an ATDMA-only
upstream channel.) Cisco recommends identical channel configurations in a load balancing group.
Dynamic Channel Change for Load Balancing entails the following new or enhanced commands in
Cisco IOS Release 12.3(17a)BC, and later releases:
Global Configuration Commands
•
cable load-balance group group-num dcc-init-technique <0-4>
•
cable load-balance group group-num policy { pcmm | ugs }
•
cable load-balance group group-num threshold {load | pcmm | stability | ugs} <1-100>
•
cable load-balance group group-num threshold load <1-100> {minimum}
•
cable load-balance group group-num threshold load <1-100> {enforce}
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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New and Changed Information
Testing Command
•
test cable dcc mac-addr {slot/port | slot/subslot/port} target-us-channel-id ranging-technique
For configuration, command reference, testing, and examples for DCC on the Cisco CMTS, refer to the
following documents on Cisco.com:
•
Load Balancing and Dynamic Channel Change (DCC) on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/troubleshooting_batch9/cmtslbg.html.
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
DOCSIS 2.0 SAMIS ECR Data Set
The Usage-Based Billing feature for the Cisco Cable Modem Termination System (CMTS) provides
subscriber account and billing information in the Subscriber Account Management Interface
Specification (SAMIS) format. The SAMIS format is specified by the Data-over-Cable Service Interface
Specifications (DOCSIS) Operations Support System Interface (OSSI) specification.
Cisco IOS Release 12.3(17a)BC provides enhancements to the OSSI specifications, and billing reports
(billing record format), added support to the CISCO-CABLE-METERING-MIB, which contains objects
that provide subscriber account and billing information in the SAMIS format, added support for DCC
and DCC for Load balancing and Downstream LLQ.
For additional information, refer to the following document on Cisco.com:
•
Usage-Based Billing for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubrsamis.html.
DSX Messages and Synchronized PHS Information
Cisco IOS Release 12.3(17a)BC introduces support for payload header suppression (PHS) rules in a
High Availability environment. In this release, and later releases, PHS rules synchronize and are
supported during a switchover event of these types:
•
Route Processor Redundancy Plus (RPR+), with Active and Standby Performance Routing Engines
(PREs) on Cisco uBR10012 universal broadband routers.
•
Hot Standby Connection-to-Connection Protocol (HCCP) N+1 Redundancy, with Working and
Protect cable interface line cards
For additional information about these enhancements, and related High Availability features, refer to the
following documents on Cisco.com:
•
N+1 Redundancy for the Cisco Cable Modem Termination System
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/uFGnpls1.html.
High Availability Support for Encrypted IP Multicast
Cisco IOS Release 12.3(17a)BC introduces support for IP Multicast streams during switchover events
in a High Availability environment. This feature is supported for Route Processor Redundancy Plus
(RPR+), N+1 Redundancy, and encrypted Baseline Privacy Interface Plus (BPI+) streams.
For additional information about IP Multicast and High Availability, refer to these documents on
Cisco.com:
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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•
Cisco CMTS Universal Broadband Router MIB Specifications Guide
http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_technical_reference_list.html
•
Dynamic Shared Secret for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubrdmic.html.
•
IP Multicast in Cable Networks, White Paper
http://www.cisco.com/en/US/tech/tk828/technologies_case_study0900aecd802e2ce2.shtml
•
N+1 Redundancy for the Cisco Cable Modem Termination System
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/uFGnpls1.html.
IPv6 over L2VPN
Beginning with Cisco IOS Release 12.3(17a)BC, the Cisco uBR7246VXR router now supports IPv6
using Layer 2 VPNs based on SID to 802.1q mapping. The Cisco uBR7246VXR router already
supported Transparent LAN service with Layer 2 VPNs in Cisco IOS Release 12.3(13a)BC and later
releases. As more Internet users switch to IPv6, the Cisco IPv6 protocol support helps enable the
transition. IPv6 fixes a number of limitations in IPv4, such as limited numbers of available IPv4
addresses in addition to improved routing and network autoconfiguration. This feature allows customers
to introduce IPv6 into their network with minimal operational impact.
For additional information about this feature, refer to the following documents on Cisco.com:
•
IPv6 Documentation: overview, technology, design and configuration information
http://www.cisco.com/en/US/tech/tk872/tsd_technology_support_protocol_home.html
Management Information Base (MIB) Changes and Enhancements
MIB enhancements in Cisco IOS Release 12.3(17a)BC provide enhanced management features that
enable the Cisco uBR 7246VXR router to be managed through the Simple Network Management
Protocol (SNMP). These enhanced management features allow you to:
•
Use SNMP set and get requests to access information in Cisco CMTS universal broadband routers.
•
Reduce the amount of time and system resources required to perform functions like inventory
management.
•
A standards-based technology (SNMP) for monitoring faults and performance on the router.
•
Support for SNMP versions (SNMPv1, SNMPv2c, and SNMPv3).
•
Notification of faults, alarms, and conditions that can affect services.
For additional information about these MIB changes, refer to the following document on Cisco.com:
•
Cisco CMTS Universal Broadband Router MIB Specifications Guide
http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_technical_reference_list.html.
Pre-equalization Control for Cable Modems
Cisco IOS Release 12.3(17a)BC introduces pre-equalization control for cable modems on a per-modem
basis. This feature enhances support for pre-equalization control on an interface basis with the
Organizational Unique Identifier (OUI), which is also supported.
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New and Changed Information
When pre-equalization is enabled on an upstream interface, this feature allows you to disable
pre-equalization adjustment selectively, for a specific cable modem or a group of cable modems. This
feature prevents cable modems from flapping when processing pre-equalization requests sent from the
Cisco CMTS.
Restrictions
This feature observes the following restrictions in Cisco IOS Release 12.3(17a)BC:
•
For pre-equalization to be supported on a per-modem basis, the cable modem must send verification
of pre-equalization after it registers with the Cisco CMTS.
•
The option of excluding the OUI is a global configuration. For the cable modem on which OUI is
excluded, the excluded OUI is disabled for all interfaces. This method uses a list of OUI values,
recording which modems are sent and not sent pre-equalization.
•
To remove this exclusion, use the no cable pre-equa exclude {modem|oui} form.
cable pre-equalization exclude
To exclude a cable modem from pre-equalization during registration with the Cisco CMTS, use the
cable pre-equalization exclude command in global configuration mode. Exclusion is supported for a
specified cable modem, or for a specified OUI value for the entire interface. To remove exclusion for the
specified cable modem or interface, use the no form of this command. Removing this configuration
returns the cable modem or interface to normal pre-equalization processes during cable modem
registration.
cable pre-equalization exclude {oui | modem} mac-addr
no cable pre-equalization exclude {oui | modem} mac-addr
Syntax Description
oui
Organizational Unique identifier for the interface specified. Using this
keyword excludes the specified OUI during cable modem registration for
the associated interface.
modem
Cable Modem identifier for the cable modem specified. Using this keyword
excludes the cable modem.
mac-addr
Identifier for the OUI or cable modem to be excluded.
Command Default
Pre-equalization is enabled by default on the Cisco router, and for cable modems that have a valid and
operational DOCSIS configuration file. When enabled, pre-equalization sends ranging messages for the
respective cable modems. When disabled with the new exclude command, pre-equalization is excluded
for the respective cable modems.
Command Modes
Global configuration mode
Command History
Release
Modification
12.3(17a)BC
This command was introduced to the Cisco uBR10012 router and the
Cisco uBR7246VXR router.
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Usage Guidelines
The pre-equalization exclusion feature should be configured for the running configuration of the
Network Processing Engine (NPE), the Performance Routing Engine (PRE), and the line card console.
Examples
The following example configures pre-equalization to be excluded for the specified cable modem.
Pre-equalization data is not sent for the corresponding cable modem:
Router(config)# cable pre-equalization exclude modem mac-addr
The following example configures pre-equalization to be excluded for the specified OUI value of the
entire interface. Pre-equalization data is not sent for the corresponding OUI value of the entire interface:
Router(config)# cable pre-equalization exclude oui mac-addr
The following series of commands configures pre-equalization on the Cisco uBR7246VXR router with
MC5X20U BPEs. On the PRE Console, configure the following commands.
Router# conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# cable pre-equalization exclude oui 00.09.04
Router(config)# end
Router# show run
Router# show running-config | inc oui
cable pre-equalization exclude oui 00.09.04
On the line card console for the same Cisco uBR7246VXR router, verify the configuration with the
following command:
Router# show running-config | inc oui
cable pre-equalization exclude oui 00.09.04
The following example removes pre-equalization exclusion for the specified OUI and interface. This
results in the cable modem or OUI to return to normal pre-equalization functions. Ranging messages
resume sending pre-equalization data.
Router(config)# no cable pre-equalization exclude { oui | modem } mac-addr
Removal of this feature can be verified with the following debug command:
•
debug cable interface cx/x/x mac-ad—Verifies the ranging message for all non-excl modems
include pre-eq data, and for the excluded modems ranging messages do not include pre-eq data.
For additional information about this feature, refer to the following documents on Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
show cable modem Command Changes
Cisco IOS Release 12.3(17a)BC introduces changes for two versions of the show cable modem
command.
•
show cable modem mac summary
The information displayed with this command is revised. The DOCSIS 2.0 column in the quality of
service (QoS) Provision Mode field has been removed, as this field is not applicable to QoS
provisioning in DOCSIS 2.0.
Command Output in Cisco IOS Release 12.3(17a)BC and Later Releases
Router# show cable modem mac summary
Cable Modem Summary
------------------Mac Version
Interface
Total
DOC2.0 DOC1.1 DOC1.0
QoS Provision Mode
Reg/Online
DOC1.1 DOC1.0
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New and Changed Information
Cable5/1/0/U0
10
0
2
8
10
0
10
Command Output in Cisco IOS Release 12.3(13a)BC and Earlier Releases
Router# show cable modem mac summary
Cable Modem Summary
------------------Mac Version
Interface
Total
DOC2.0 DOC1.1 DOC1.0
Cable8/0/0/U0
8
0
5
3
•
QoS Provision Mode
Reg/Online
DOC2.0 DOC1.1
5
0
5
DOC1.0
0
show cable modem phy
The information displayed with this command is revised. The MicroReflec column
(MicroReflections) has been removed, and the DOCSIS Prov (DOCSIS Provider) column has been
added in its place. This new column contains DOCSIS version information.
Command Output in Cisco IOS Release 12.3(17a)BC and Later Releases
Router# show cable modem phy
MAC Address
I/F
Sid
0003.e350.9a3f
0050.734e.c1a1
0007.0e01.1749
0007.0e00.90dd
0003.e350.9ad3
0003.e38f.f4e5
0003.e350.9b97
0003.e350.9bed
0003.e308.455d
0003.6bd6.bfaf
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
C5/1/0/U0
1
2
3
4
5
6
7
8
9
10
USPwr
(dBmV)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
USSNR
(dB)
30.23
30.47
30.65
30.66
30.47
30.36
30.44
30.16
30.79
30.40
Timing
Offset
2811
2811
2808
2806
2810
2813
2812
2814
2811
2813
DSPwr
(dBmV)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
DSSNR
(dB)
-----------------------------------------
Mode
DOCSIS
Prov
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
tdma
tdma
tdma
tdma
tdma
tdma
tdma
tdma
tdma
tdma
Command Output in Cisco IOS Release 12.3(13a)BC and Earlier Releases
Router# show cable modem phy
MAC Address
I/F
Sid
0008.0e06.7b14
0050.f112.5977
0090.837b.b0b9
0007.0e03.6e99
0007.0e04.5091
0006.5314.81d9
0003.6b1b.ee63
0030.eb15.84e7
C8/0/0/U0
C8/0/0/U0
C8/0/0/U0
C8/0/0/U0
C8/0/0/U0
C8/0/0/U0
C8/0/0/U0
C8/0/0/U0
1
2
3
5
6
7
8
12
USPwr
(dBmV)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
USSNR
(dB)
30.36
30.36
30.64
30.36
30.94
30.36
31.26
30.36
Timing MicroReflec DSPwr
Offset (dBc)
(dBmV)
1938
0
0.00
1695
0
0.00
1187
0
0.00
2747
0
0.00
2746
0
0.00
2745
0
0.00
2745
0
0.00
1157
0
0.00
DSSNR
(dB)
---------------------------------
Mode
tdma
tdma
tdma
tdma
tdma
tdma
tdma
tdma
For additional information about either of these commands, refer to the following document on
Cisco.com
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
New Hardware Features in Cisco IOS Release 12.3(13a)BC6
There are no new hardware features supported in Cisco IOS Release 12.3(13a)BC6.
New Software Features in Cisco IOS Release 12.3(13a)BC6
There are no new software features supported in Cisco IOS Release 12.3(13a)BC6.
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New Hardware Features in Cisco IOS Release 12.3(13a)BC5
There are no new hardware features supported in Cisco IOS Release 12.3(13a)BC5.
New Software Features in Cisco IOS Release 12.3(13a)BC5
There are no new software features supported in Cisco IOS Release 12.3(13a)BC5.
New Hardware Features in Cisco IOS Release 12.3(13a)BC4
There are no new hardware features supported in Cisco IOS Release 12.3(13a)BC4.
New Software Features in Cisco IOS Release 12.3(13a)BC4
There are no new software features supported in Cisco IOS Release 12.3(13a)BC4.
New Hardware Features in Cisco IOS Release 12.3(13a)BC3
There are no new hardware features supported in Cisco IOS Release 12.3(13a)BC3.
New Software Features in Cisco IOS Release 12.3(13a)BC3
There are no new software features supported in Cisco IOS Release 12.3(13a)BC3.
New Hardware Features in Cisco IOS Release 12.3(13a)BC2
There are no new hardware features supported in Cisco IOS Release 12.3(13a)BC2.
New Software Features in Cisco IOS Release 12.3(13a)BC2
There are no new software features supported in Cisco IOS Release 12.3(13a)BC2.
New Hardware Features in Cisco IOS Release 12.3(13a)BC1
There are no new hardware features supported in Cisco IOS Release 12.3(13a)BC1.
New Software Features in Cisco IOS Release 12.3(13a)BC1
There are no new software features supported in Cisco IOS Release 12.3(13a)BC1.
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New and Changed Information
New Hardware Features in Cisco IOS Release 12.3(13a)BC
There are no new hardware features supported in Cisco IOS Release 12.3(13a)BC.
New Software Features in Cisco IOS Release 12.3(13a)BC
The Cisco IOS Release 12.3(13a)BC is the second major feature release in the Cisco 12.3BC release
train. This release introduces the following new features or enhancements on the Cisco uBR7200 series
routers:
•
Access Control List Support for COPS Intercept
•
Admission Control for the Cisco CMTS
•
Advanced-Mode DOCSIS Set-Top Gateway Issue 1.1
•
COPS TCP Support for the Cisco Cable Modem Termination System
•
DOCSIS 1.0 Concatenation Override Featurette
•
Dynamic SID/VRF Mapping Support
•
Enhanced Rate Bandwidth Allocation (ERBA) Support for DOCSIS 1.0 Cable Modems
•
High Availability Features in Cisco IOS Release 12.3(13a)BC
•
Multicast QoS Support
•
MLPPP Support
•
Optional Upstream Scheduler Modes
•
PacketCable Multimedia
•
Service Independent Intercept (SII) Support on the Cisco uBR7200 Series
•
Transparent LAN Service and Layer 2 Virtual Private Networks
•
Virtual Interface Bundling on the Cisco uBR-MC28/U BPE
Access Control List Support for COPS Intercept
Cisco IOS Release 12.3(13a)BC introduces enhanced command-line interface for the Common Open
Policy Service (COPS) feature.
To configure access control lists (ACLs) for inbound connections to all COPS listener applications on
the Cisco CMTS, user the cops listeners access-list command in global configuration mode. To remove
this setting from the Cisco CMTS, us the no form of this command.
cops listeners access-list {acl-num | acl-name}
no cops listeners access-list {acl-num | acl-name}
Syntax Description
acl-num
Alphanumeric identifier of up to 30 characters, beginning with a letter that
identifies the ACL to apply to the current interface.
acl-name
Numeric identifier that identifies the access list to apply to the current
interface. For standard access lists, the valid range is 1 to 99; for extended
access lists, the valid range is 100 to 199.
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Additional Information
For additional information, see the “Service Independent Intercept (SII) Support on the Cisco uBR7200
Series” section on page 62.
For additional information, refer to the following documents on Cisco.com:
•
COPS Engine Operation on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cops.html.
•
Configuring COPS for RSVP, Cisco IOS Versions 12.2 and 12.3
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfcops_ps1835_TSD_Produ
cts_Configuration_Guide_Chapter.html.
•
Cable Monitor and Intercept Features for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cmon.html.
•
PacketCable and PacketCable Multimedia on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_pkcb.html.
•
Cisco PacketCable Primer White Paper
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_white_paper09186a0080179138
.shtml
Admission Control for the Cisco CMTS
Admission Control for the Cisco Cable Modem Termination System (CMTS) is a multifaceted feature
that implements a Quality of Service (QoS) policy on the CMTS Headend. Admission Control
establishes efficient resource and bandwidth utilization in a way that was not possible in prior Cisco IOS
releases.
Admission Control monitors multiple system-level resources on the Cisco CMTS, and performs
automatic resource allocation on a service-request basis. Admission Control maintains optimal
system-level operation by preventing resource consumption that would otherwise degrade the
performance for the entire Cisco CMTS. Furthermore, Admission Control can allocate upstream or
downstream bandwidth resources to specific DOCSIS traffic types, and maintain such prioritization
amidst very dynamic traffic conditions.
Admission Control uses two event types for resource monitoring and management—cable modem
registration and dynamic service (voice call) requests. When either of these two events occurs on the
Cisco CMTS, Admission Control verifies that the associated resources conform to the configured limits
prior to admitting and supporting the service call request.
Admission Control is not a mechanism to apply QOS to the traffic flows. Scheduling and queuing are
some of the mechanisms used for implementing the QOS. The QOS is applied on per packet basis.
Admission Control checks are performed before the flow is committed.
Admission Control in Cisco IOS Release 12.3(13)BC monitors the following resources on the
Cisco CMTS.
•
CPU utilization—Admission Control monitors CPU utilization on the Cisco CMTS, and preserves
QoS for existing service flows when new traffic would otherwise compromise CPU resources on the
Cisco CMTS.
•
Memory resource utilization (I/O, Processor, and combined total)—Admission Control monitors
one or both memory resources and their consumption, and preserves QoS in the same way as CPU
utilization.
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•
Bandwidth utilization for upstream and downstream—Admission Control monitors upstream and
downstream bandwidth utilization, and associated service classes, whether for data or dynamic
service traffic.
Cisco IOS Release 12.3(13a)BC introduces new configuration, debug and show commands for
Admission Control on the Cisco CMTS. For additional information, refer to the following document on
Cisco.com:
•
Admission Control for the Cisco Cable Modem Termination System
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_adm.html.
Advanced-Mode DOCSIS Set-Top Gateway Issue 1.1
Cisco IOS Release 12.3(13a)BC introduces support for DOCSIS Set-Top Gateway (DSG) Issue 1.1 on
the Cisco uBR7246VXR router. DOCSIS Set-Top Gateway (DSG) 1.1 introduces Advanced mode DSG
functionality based on Cablelabs specification CM-SP-DSG-I03-041124.
DSG 1.1 introduces support for several DOCSIS 1.1 networks and their multiple service operators
(MSOs):
•
Supports advanced mode capabilities such as DCD, Regionalization, Fragmentation, and Quality of
Service (QoS).
•
Retains the essential nature of out of band (OOB) messaging, but moves it to a modern technology
base, offering enhanced security for Multicast delivery of OOB messages dynamically to Set-top
boxes.
•
Replaces single-vendor, low-density, special-purpose equipment on the network, with significantly
increased subscriber bandwidth and traffic.
•
Consolidates cable modem and STB data traffic on a shared DOCSIS channel.
•
Increases high-speed data (HSD) services to cable TV subscribers over the DOCSIS 1.1
infrastructure,
•
Extends support for DOCSIS 1.1 digital video broadcast traffic.
•
Enables shared or dedicated support for either HSD or video traffic.
•
Supports one- or two-way operations, and advanced, two-way interactive applications such as
streaming video, Web browsing, email, real-time chat applications, and targeted advertising
services.
These powerful advantages maximize the performance and return of hybrid fiber-coaxial (HFC) plant
investments.
Changes from Cisco DSG 1.0
DSG Issue 1.0 is oriented to the DOCSIS DSG-I01 specifications, while DSG Issue 1.1 is oriented
towards DOCSIS DSG-I02 specifications, to include the new Advanced Mode DSG (A-DSG).
The following DSG 1.1 features are supported in Cisco IOS Release 12.3(13a)BC while continuing
support for Basic Mode DSG:
•
DSG 1.1 enables the learning of dynamic tunnel definitions. DSG 1.0 only had static tunnel
definitions (programmed into the set-top box).
•
DSG 1.1 features new Cisco IOS command-line interface (CLI) configuration and show commands
for A-DSG configuration and network information.
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Unlike earlier issues of DSG, Advanced-mode DSG (A-DSG) uses a DOCSIS MAC Management
Message called the Downstream Channel Descriptor (DCD) message, and this DCD message manages
the DSG Tunnel traffic. The DCD message is sent once per second on each downstream and is used by
the DSG Client to determine which tunnel and classifier to use.
The DCD has a DSG address table located in the DOCSIS MAC management message. The primary
difference between DSG 1.0 (and earlier issues) and A-DSG 1.1 is that advanced mode uses DCD
messages to manage the DSG tunnels.
The DCD message contains a group of DSG Rules and DSG Classifiers, including the following:
•
DSG rules and rule priority
•
DSG classifiers
•
DSG channel list type/length value (TLV)
•
DSG client identifier (whether broadcast, CA System, application, or MAC-level)
•
DSG timer list
•
DSG upstream channel ID (UCID) list
•
Vendor-specific information field
Prerequisites for DSG 1.1
•
Cisco IOS Release 12.3(13a)BC or a later release are required.
Restrictions and Caveats for DSG 1.1
Cisco DSG 1.1 has the following restrictions:
•
Cisco DSG 1.1 does not support Service Flow Quality of Service (QoS), which is available at Layer
3.
•
Cisco DSG 1.1 does not support tunnel security, but strictly access control lists (ACLs).
•
Cisco DSG 1.1 does not support subinterfaces.
•
Cisco DSG 1.1 does not support HCCP N+1 interoperability.
•
Cisco DSG 1.1 does not support SNMP MIBS for A-DSG.
Additional Information about DSG 1.1
For additional information, refer to the following documents on Cisco.com:
•
Advanced-mode DOCSIS Set-Top Gateway Issue 1.1 for the Cisco CMTS
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_docsis_gw12_ps2209_TSD
_Products_Configuration_Guide_Chapter.html
•
DOCSIS Set-Top Gateway (DSG) for the Cisco CMTS
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a00802065c
8.html
•
Cisco DOCSIS Set-top Gateway White Paper
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_white_paper09186a00801b3f0f.
shtml
•
CableLabs DOCSIS Set-top Gateway (DSG) Interface Specification SP-DSG-I03
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Cable Monitor Support for Cisco MC28U Broadband Processing Engines
Cisco IOS Release 12.3(13a)BC introduces support for the Cisco MC28U Broadband Processing
Engines for the Cisco uBR7246VXR routers. This feature enables intercept and monitoring capabilities
for DOCSIS-compliant frames. The Cable Monitor and Intercept features for Cisco Cable Modem
Termination System (CMTS) routers provide a software solution for monitoring and intercepting traffic
coming from a cable network. This feature also gives service providers Lawful Intercept capabilities,
such as those required by the Communications Assistance for Law Enforcement Act (CALEA).
Note
The cable monitor feature does not support access lists for intelligent cable interface line cards such as
the Cisco MC28U or Cisco MC16U in the Cisco uBR7246VXR router.
The Cable Monitor and Intercept features for Cisco Cable Modem Termination System (CMTS) routers
provide a software solution for monitoring and intercepting traffic coming from a cable network that is
based on monitoring and intercepting of DOCSIS frames. This feature can be used for Lawful Intercept
capabilities, such as those required by the Communications Assistance for Law Enforcement Act
(CALEA).
To enable the forwarding of selected packets on the cable interface to an external LAN analyzer, use the
cable monitor command in cable interface configuration mode. To disable this function, use the no form
of this command.
cable monitor [incoming | outbound] [timestamp]
interface interface {access-list {name | number} | mac-address address | sid sid-number}
[packet-type {data docsis | data ethernet | mac [type type] } ]
no cable monitor
Syntax Description
incoming
Forwards only packets being received on the upstream.
outbound
Forwards only packets being transmitted on the downstream.
timestamp
Enables packet time-stamping by appending a four-byte value to the
forwarded packets. The timestamp value is in hundredths of a second.
interface interface
Specifies the WAN interface to which an external LAN analyzer is attached,
and to which packets should be forwarded. You can forward packets only to
an Ethernet, Fast Ethernet, or Gigabit Ethernet interface.
access-list name|
number
Specifies the IP access list name or number (1 to 2699).
mac-address address
Specifies the MAC address of the device being monitored.
sid sid-number
Specifies the service ID for the packets that should be forwarded (1 to
16384). NOTE This option is supported only in Cisco IOS releases that
support DOCSIS 1.1 operations.
packet-type
(Optional) Specifies whether data or MAC packets are forwarded.
data docsis
Specifies that complete DOCSIS packets (both the DOCSIS header and the
complete Ethernet frame) should be forwarded. Note Enabling this option
can result in %LINK-4-TOOBIG messages being generated if the original
Ethernet frame is at or near the maximum Ethernet size of 1500 bytes. This
is because this option adds additional bytes (the DOCSIS header) to the
Ethernet frame, which can result in a total frame size that exceeds the
maximum size that is allowed for standard Ethernet frames.
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data ethernet
Specifies that the DOCSIS header should be stripped from the packet and
that only the Ethernet frame should be forwarded.
mac [type type]
Specifies that only DOCSIS MAC-layer packets should be forwarded. If
you are using the sid option, you can also optionally specify the type option
with one of the following keywords to indicate that only the specific type of
MAC-layer traffic should be forwarded: dsa—Dynamic service addition
dsc—Dynamic service change dsd—Dynamic service deletion
map-grant—Grants map-req—Requests
The following example configures cable monitor for the specified interface and the associated MAC
address:
Router(config)# interface Cable3/0
Router(config-if)# cable monitor interface GigabitEthernet0/1
mac-address 000e.5cc8.fa5f
packet-type data ethernet
Router(config-if)#
mac-address 000e.5cac.59f8
packet-type data ethernet
To display cable monitor configuration and status information, use the show interfaces command in
Privileged EXEC mode:
Router# show interfaces cable 3/0 monitor
US/ Time Outbound Flow
Flow Type
DS Stmp Interface Type
Identifier
all no
Gi0/1
mac-addr 000e.5cc8.fa5f
all no
Gi0/1
mac-addr 000e.5cac.59f8
Flow
Extn.
yes
yes
Packet
Type
data
data
MAC
MACEncap
Extn. TypeType
no
-ethernet
no
-ethernet
To display and monitor traffic statistics and counters over time, use the show cable modem counters
and the show interfaces commands in Privileged EXEC mode, as illustrated:
Router# show interfaces cable 3/0 monitor
US/ Time Outbound Flow
Flow Type
Flow Packet MAC
MACEncap
DS Stmp Interface Type
Identifier
Extn. Type
Extn. TypeType
all no
Gi0/1
mac-addr 000e.5cc8.fa5f yes
data
no
-ethernet
all no
Gi0/1
mac-addr 000e.5cac.59f8 yes
data
no
-ethernet
Router# show cable modem 000e.5cac.59f8 counters
MAC Address
US Packets
US Bytes
DS Packets
DS Bytes
000e.5cac.59f8 7537986
3828867645 7199188
3711248288
Router# show interfaces GigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is BCM1250 Internal MAC, address is 000e.d6bd.2001 (bia 000e.d6bd.2001)
Description: ***Sonde_analyse_trafic***
Internet address is 82.216.52.1/30
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is RJ45
output flow-control is XON, input flow-control is XON
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:08, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/5/0 (size/max/drops/flushes); Total output drops:361
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1094862 packets input, 70425672 bytes, 0 no buffer
Received 0 broadcasts, 5 runts, 0 giants, 0 throttles
0 input errors, 10 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 37 multicast, 0 pause input
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0 input packets with dribble condition detected
188665 packets output, 29355747 bytes, 0 underruns
0 output errors, 0 collisions, 6 interface resets
0 babbles, 0 late collision, 0 deferred
12 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
<<< 188665 packets
When cable monitor is active, counters for the above commands should increase over time. For
additional information about cable monitoring on the Cisco CMTS, refer to these documents on
Cisco.com:
•
Cable Monitor and Intercept Features for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cmon.html.
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
COPS TCP Support for the Cisco Cable Modem Termination System
Cisco IOS Release 12.3(13a)BC introduces optimized support for the Common Open Policy Service
(COPS) feature for the Cisco uBR7200 series router. This feature supports two new configuration
commands for enabling and setting COPS processes. The COPS feature in Cisco IOS
Release 12.3(13a)BC enables the following COPS functions:
COPS DSCP Marking for the Cisco CMTS
This feature allows you to change the DSCP marking for COPS messages that are transmitted or received
by the Cisco router. Differentiated Services Code Point (DSCP) values are used in Quality of Service
(QoS) configurations on a Cisco router. DSCP summarizes the relationship between DSCP and IP
precedence.
Cisco IOS Release 12.3(13a)BC supports this function with the cops ip dscp command in global
configuration mode.
COPS TCP Window Size for the Cisco CMTS
This feature allows you to override the default TCP receive window size that is used by COPS processes.
This setting can be used to prevent the COPS server from sending too much data at one time.
Cisco IOS Release 12.3(13a)BC supports this function with the cops tcp window-size command in
global configuration mode.
Note
These two commands affect all TCP connections with all COPS servers.
cops ip dscp
To specify the marking for COPS messages that are transmitted by the Cisco router, use the cops ip dscp
command in global configuration mode. To remove this configuration, use the no form of this command.
cops ip dscp x
no cops ip dscp
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Syntax Description
Defaults
Usage Guidelines
Examples
x
This value specifies the markings with which COPS messages are transmitted. The
following values are supported:
•
0-63—DSCP value ranging from 0-63.
•
af11—Use AF11 dscp (001010)
•
af12—Use AF12 dscp (001100)
•
af13—Use AF13 dscp (001110)
•
af21—Use AF21 dscp (010010)
•
af22—Use AF22 dscp (010100)
•
af23—Use AF23 dscp (010110)
•
af31—Use AF31 dscp (011010)
•
af32—Use AF32 dscp (011100)
•
af33—Use AF33 dscp (011110)
•
af41—Use AF41 dscp (100010)
•
af42—Use AF42 dscp (100100)
•
af43—Use AF43 dscp (100110)
•
cs1—Use CS1 dscp (001000) [precedence 1]
•
cs2—Use CS2 dscp (010000) [precedence 2]
•
cs3—Use CS3 dscp (011000) [precedence 3]
•
cs4—Use CS4 dscp (100000) [precedence 4]
•
cs5—Use CS5 dscp (101000) [precedence 5]
•
cs6—Use CS6 dscp (110000) [precedence 6]
•
cs7—Use CS7 dscp (111000) [precedence 7]
•
default—Use default dscp (000000)
•
ef—Use EF dscp (101110)
•
For messages transmitted by the Cisco router, the default DSCP value is 0.
•
For incoming connections to the Cisco router, by default, the COPS engine takes the DSCP value
used by the COPS server that initiates the TCP connection.
•
The cops ip dscp command allows the Cisco router to re-mark the COPS packets for either incoming
or outbound connections.
•
This command affects all TCP connections with all COPS servers.
•
This command does not affect existing connections to COPS servers. Once you issue this command,
this function is supported only for new connections after that point in time.
The following example illustrates the cops ip dscp command with supported command variations:
Router(config)# cops ip dscp ?
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<0-63>
af11
af12
af13
af21
af22
af23
af31
af32
af33
af41
af42
af43
cs1
cs2
cs3
cs4
cs5
cs6
cs7
default
ef
DSCP value
Use AF11 dscp (001010)
Use AF12 dscp (001100)
Use AF13 dscp (001110)
Use AF21 dscp (010010)
Use AF22 dscp (010100)
Use AF23 dscp (010110)
Use AF31 dscp (011010)
Use AF32 dscp (011100)
Use AF33 dscp (011110)
Use AF41 dscp (100010)
Use AF42 dscp (100100)
Use AF43 dscp (100110)
Use CS1 dscp (001000) [precedence
Use CS2 dscp (010000) [precedence
Use CS3 dscp (011000) [precedence
Use CS4 dscp (100000) [precedence
Use CS5 dscp (101000) [precedence
Use CS6 dscp (110000) [precedence
Use CS7 dscp (111000) [precedence
Use default dscp (000000)
Use EF
dscp (101110)
1]
2]
3]
4]
5]
6]
7]
Additional COPS Information
Cisco IOS Release 12.3(13a)BC also supports Access Control Lists (ACLs) for use with COPS. Refer
to the “Access Control List Support for COPS Intercept” section on page 46.
For additional information about configuring COPS on the Cisco CMTS, refer to the following
documents on Cisco.com:
•
COPS Engine Operation on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cops.html.
•
Cable Monitor and Intercept Features for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cmon.html.
•
Configuring COPS for RSVP
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfcops_ps1835_TSD_Produ
cts_Configuration_Guide_Chapter.html.
cops tcp window-size
To override the default TCP receive window size on the Cisco CMTS, use the cops tcp window-size
command in global configuration mode. This setting allows you to prevent the COPS server from
sending too much data at one time. To return the TCP window size to a default setting of 4K, use the no
form of this command.
cops tcp window-size bytes
no cops tcp window-size
Syntax Description
bytes
This is the TCP window size setting in bytes. This value can range from 516
to 65535 bytes.
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Defaults
The default COPS TCP window size is 4000 bytes.
Usage Guidelines
This command does not affect existing connections to COPS servers. Once you issue this command, this
function is supported only for new connections after that point in time.
Examples
The following example configures the TCP window size to be 64000 bytes.
Router(config)# cops tcp window-size 64000
The following example illustrates online help for this command:
Router(config)# cops tcp window-size ?
<516-65535> Size in bytes
Additional COPS Information
Cisco IOS Release 12.3(13a)BC also supports Access Control Lists (ACLs) for use with COPS. Refer
to the “Access Control List Support for COPS Intercept” section on page 46.
For additional information about configuring COPS on the Cisco CMTS, refer to the following
documents on Cisco.com:
•
COPS Engine Operation on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cops.html
•
Cable Monitor and Intercept Features for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cmon.html.
•
Configuring COPS for RSVP
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfcops_ps1835_TSD_Produ
cts_Configuration_Guide_Chapter.html.
DOCSIS 1.0 Concatenation Override Featurette
Cisco IOS Release 12.3(13a)BC introduces support for the DOCSIS 1.0 concatenation override feature
on the Cisco uBR7200 router. This feature provides the ability to disable concatenation on DOCSIS 1.0
cable modems, even in circumstances where concatenation is otherwise supported for the upstream
channel.
DOCSIS 1.0 concatenation allows the cable modem to make a single-time slice request for multiple
packets, and to send all packets in a single large burst on the upstream. Concatenation was introduced in
the upstream receive driver in the previous Cisco IOS releases that supported DOCSIS 1.0 +. Per-SID
counters were later added in Cisco IOS Release 12.1(4)CX for debugging concatenation activity.
In some circumstances, overriding concatenation on DOCSIS 1.0 cable modems may be preferable, and
Cisco IOS Release 12.3(13a)BC supports either option.
Note
Even when DOCSIS 1.0 concatenation is disabled with this feature, concatenation remains enabled for
cable modems that are compliant with DOCSIS 1.1 or DOCSIS 2.0.
To enable DOCSIS 1.0 concatenation override with Cisco IOS Release 12.3(13a)BC and later releases,
use the new docsis10 keyword with the previously supported cable upstream <n> concatenation
command in privileged EXEC mode:
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cable upstream <n> concatenation docsis10
Syntax Description
n
Examples
The following example illustrates DOCSIS 1.0 concatenation override on the Cisco uBR7246VXR
router:
Specifies the upstream port number. Valid values start with 0 for the first
upstream port on the cable interface line card.
Router# no cable upstream 0 concatenation docsis10
In this example, DOCSIS 1.0 cable modems are updated with REG-RSP so that they are not permitted
to use concatenation.
For additional information about this command, refer to the following document on Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
Dynamic SID/VRF Mapping Support
Cisco IOS Release 12.3(13a)BC introduces support for dynamic service ID (SID) and VRF mapping on
the Cisco CMTS, to support VoIP with MPLS. Formerly, the MPLS SID mapping feature only applied
to provisioned service flows. This feature enables the mapping of all PacketCable DQoS service flows
to one particular VRF.
For additional information about dynamic SID to VRF mapping, refer to the following document on
Cisco.com:
•
Mapping Service Flows to MPLS VPN on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_serv.html
Enhanced Rate Bandwidth Allocation (ERBA) Support for DOCSIS 1.0 Cable Modems
Cisco IOS Release 12.3(13a)BC introduces Enhanced Rate Bandwidth Allocation (ERBA) support for
DOCSIS 1.0 cable modems and the Cisco uBR7200 series router. ERBA allows DOCSIS1.0 modems to
burst their temporary transmission rate up to the full line rate for short durations of time. This capability
provides higher bandwidth for instantaneous bandwidth requests, such as those in Internet downloads,
without having to make changes to existing service levels in the QoS Profile.
This feature enables MSOs to set the DOCSIS 1.0 cable modems burst transmissions, with mapping to
overriding DOCSIS 1.1 QoS profile parameters on the Cisco CMTS. DOCSIS 1.0 cable modems require
DOCSIS 1.0 parameters when registering to a matching QoS profile. This feature enables maximum
downstream line rates, and the ERBA setting applies to all cable modems that register to the
corresponding QoS profile.
Note
QoS definitions must previously exist on the Cisco CMTS headend to support this feature.
ERBA for DOCSIS 1.0 cable modems is supported with these new or enhanced commands or keywords
in Cisco IOS Release 12.3(13a)BC:
•
cable qos pro max-ds-burst burst-size
•
show cable qos profile n [verbose]
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To define ERBA on the downstream for DOCSIS 1.0 cable modems, use the cable qos promax-ds-burst
command in global configuration mode. To remove this ERBA setting from the QoS profile, use the no
form of this command.
cable qos pro max-ds-burst burst-size
no cable qos pro max-ds-burst
Syntax Description
burst-size
The QoS profile’s downstream burst size in bytes.
To display ERBA settings as applied to DOCSIS 1.0 cable modems and QoS profiles on the
Cisco CMTS, use the show cable qos profile command in Privileged EXEC mode.
The following example of the cable qos profile command in global configuration mode illustrates
changes to the cable qos profile command. Fields relating to the ERBA feature are shown in bold for
illustration:
Router(config)# cable qos pro 10 ?
grant-interval
Grant interval
grant-size
Grant size
guaranteed-upstream Guaranteed Upstream
max-burst
Max Upstream Tx Burst
max-ds-burst
Max Downstream Tx burst (cisco specific)
max-downstream
Max Downstream
max-upstream
Max Upstream
name
QoS Profile name string (cisco specific)
priority
Priority
privacy
Cable Baseline Privacy Enable
tos-overwrite
Overwrite TOS byte by setting mask bits to value
The following example of the show cable qos profile command illustrates that the maximum
downstream burst has been defined, and is a management-created QoS profile:
Router# show cable
ID Prio Max
upstream
bandwidth
1
0
0
2
0
64000
3
7
31200
4
7
87200
6
1
90000
10 1
90000
50 0
0
51 0
0
qos pro
Guarantee
upstream
bandwidth
0
0
31200
87200
0
0
0
0
Max
downstream
bandwidth
0
1000000
0
0
90000
90000
96000
97000
Max
tx
burst
0
0
0
0
1522
1522
0
0
TOS TOS
Create
mask value by
0xFF
0xFF
0xFF
0xFF
0xFF
0x1
0xFF
0xFF
0x0
0x0
0x0
0x0
0x0
0xA0
0x0
0x0
B
priv
enab
cmts(r) no
cmts(r) no
cmts
yes
cmts
yes
mgmt
yes
mgmt
no
mgmt
no
mgmt
no
IP prec.
rate
enab
no
no
no
no
no
no
no
no
The following example illustrates the maximum downstream burst size in sample QoS profile 10 with
the show cable qos prof verbose command in privileged EXEC mode:
Router# show cable qos pro 10 ver
Profile Index
10
Name
Upstream Traffic Priority
1
Upstream Maximum Rate (bps)
90000
Upstream Guaranteed Rate (bps)
0
Unsolicited Grant Size (bytes)
0
Unsolicited Grant Interval (usecs)
0
Upstream Maximum Transmit Burst (bytes) 1522
Downstreamam Maximum Transmit Burst (bytes) 100000
IP Type of Service Overwrite Mask
0x1
IP Type of Service Overwrite Value
0xA0
Downstream Maximum Rate (bps)
90000
Created By
mgmt
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Baseline Privacy Enabled
Usage Guidelines
no
If a cable modem registers with a QoS profile that matches one of the existing QoS profiles on the
Cisco CMTS, then the maximum downstream burst size, as defined for that profile, is used instead of the
default DOCSIS QoS profile of 1522.
For example, a DOCSIS 1.0 configuration that matches QoS profile 10 in the previous examples would
be as follows:
03 (Net Access Control)
= 1
04 (Class of Service Encodings Block)
S01 (Class ID)
= 1
S02 (Maximum DS rate)
= 90000
S03 (Maximum US rate)
= 90000
S06 (US burst)
= 1522
S04 (US Channel Priority)
= 1
S07 (Privacy Enable)
= 0
The maximum downstream burst size (as well as the ToS overwrite values) are not explicitly defined in
the QoS configuration file because they are not defined in DOCSIS. However, because all other
parameters are a perfect match to profile 10 in this example, then any cable modem that registers with
these QoS parameters has a maximum downstream burst of 100000 bytes applied to it.
For further illustration, consider a scenario in which packets are set in lengths of 1000 bytes at 100
packets per second (pps). Therefore, the total rate is a multiplied total of 1000, 100, and 8, or 800kbps.
To change these settings, two or more traffic profiles are defined, with differing downstream QoS
settings as desired. Table 6 provides two examples of such QoS profiles for illustration:
Table 6
Sample QoS Profiles with Differing ERBA (Maximum Downstream) Settings
QoS Profile Setting
QoS Profile 101
QoS Profile 102
Maximum Downstream Transmit Burst (bytes) max-burst 4000
max-burst 4000
Maximum Downstream Burst (bps)
max-ds-burst 20000
max-ds-burst 5000
Maximum Downstream Bandwidth
max-downstream 100
max-downstream 100
In this scenario, both QoS profiles are identical except for the max-ds-burst size, which is set to 5000 in
QoS profile 101 and 5000 in QoS profile 102.
Optimal Settings for DOCSIS 1.0 Downstream Powerburst
DOCSIS allows the setting different token bucket parameters for each service flow, including the token
bucket burst size. When burst sizes are closer to 0, QoS is enforced in a stricter manner, allowing a more
predictable sharing of network resources, and as a result easier network planning.
When burst sizes are larger, individual flows can transmit information faster (lower latency), although
the latency variance can be larger as well.
For individual flows, a larger burst size is likely to be better. As long as the system is not congested, a
large burst size reduces the chances of two flows transmitting at the same time, because each burst is
likely to take less time to transmit. However, as channel bandwidth consumption increases, it is probably
that large burst traffic would exceed the thresholds of buffer depths, and latency is longer than with well
shaped traffic.
For additional information about the cable qos profile command and configuring QoS profiles, refer to
the following documents on Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
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http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
•
DOCSIS 1.1 for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_docs.html.
High Availability Features in Cisco IOS Release 12.3(13a)BC
Cisco IOS Release 12.3(13a)BC removes support for HCCP N+1 Redundancy on the Cisco uBR7200
series routers. Associated configuration, show, and debug commands are not supported in this release.
Note
The latest release to support HCCP N+1 Redundancy for the Cisco uBR7200 series is Cisco IOS
Release 12.3(9a)BC. When upgrading from this or earlier supporting Cisco IOS releases to Cisco IOS
Release 12.3(13a)BC, the HCCP configurations are discarded and not retained.
HCCP N+1 Redundancy for the Cisco CMTS is described for earlier releases in this and additional
documents on Cisco.com:
•
N+1 Redundancy for the Cisco Cable Modem Termination System
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/uFGnpls1.html.
Multicast QoS Support
Cisco IOS Release 12.3(13a)BC introduces support for Multicast downstream QoS feature. This feature
provides the ability to assign static mapping to a multicast group. The Multicast downstream QoS feature
uses the existing infrastructure (DOCSIS 1.1 service flow) to assign a multicast service identifier (SID)
to a multicast group used in the Baseline Privacy Interface (BPI) encryption feature.
When disabled, the Multicast downstream QoS feature does not impact any other features. The multicast
packets to downstream cable interfaces are sent to the default service flow.
This feature is being implemented in response to CSCeg22989 which states, multicast traffic is not
classified to any service flow, and therefore ends up queued on the default service flow. The default
service flow has no specific QoS guarantees assigned to it. So once the interface approaches congestion
level, multicast packets may be dropped.
Restrictions
•
The multicast definitions are per-bundle, not per interface. This means that all downstreams in a
bundle share the same multicast to QoS association. The downstreams will create their own service
flows according to the same QoS parameters.
•
Multicast to QoS definitions can not be assigned per sub-interface
•
Multicast SIDs are not deleted when a group becomes idle (no response to IGMP reports).
•
The QoS assignments for a multicast group can not be changed dynamically. If the user wishes to
change them then a new “cable match” command must be configured.
New and Changed Commands
cable match address
Use the existing “cable match” command to assign QoS to a multicast group, with BPI either enabled or
disabled.
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Router# cable match address <number>|<name> [service-class <name> [bpi-enable]]
Router# no cable match address [<number>|<name> [service-class <name> [bpi-enable]]]
debug cable mcast-qos
Use this command to turn on CMTS Multicast Qos debugging.
router# debug cable mcast-qos
MLPPP Support
The Cisco IOS Multilink Point-to-Point Protocol (MLPPP) feature is now supported for selected line
cards and port adapters on the Cisco uBR7200 series. There is no new hardware or software for MLPPP
in this release.
Note
MLPPP combines one or more physical interfaces into a virtual “bundle” interface. The bandwidth of
the bundle interface is equal to the sum of the component links’ bandwidth. This allows service providers
to make the step from T1 and E1 lines to affordable T3 and E3 speeds.
MLPPP is configured not on a cable interface, but on the T1/E1 link.
Line Cards and Port Adapters Supporting MLPPP on the Cisco uBR7200 Series
Table 7 lists the line cards and port adapters on the Cisco uBR7200 series, in conjunction with the
applicable network processing engine (NPE), that are supported for MLPPP at the time Cisco IOS
Release 12.3(13a)BC was released.
Table 7
Model
Line Cards and Port Adapters Supporting MLPPP on the Cisco uBR7200 Series for
Cisco IOS Release 12.3(13a)BC
NPE
Cisco uBR7246VXR NPE-400, NPE-G1
Line Card
Port Adapter
MC16C, MC16S,
MC28C, MC28U
PA-4T+,
PA-MC-2E1/120,
PA-MC-4T1
PacketCable Multimedia
Cisco IOS Release 12.3(13a)BC introduces support for PacketCable Multimedia (PCMM) on the
Cisco uBR7200 universal broadband router, and supports the CableLabs PacketCable Multimedia
Specification, PKT-SP-MM-I02-040930. As described by CableLabs, some key features of the PCMM
service delivery framework include the following:
•
Simple, powerful access to DOCSIS 1.1 QoS mechanisms supporting both time and volume-based
network resource authorizations
•
Abstract, event-based network resource auditing and management mechanisms
•
A robust security infrastructure that provides integrity and appropriate levels of protection across all
interfaces
Packet Cable Multimedia functionality on the Cisco CMTS enables Cable Operators to offer multimedia
services over their cable networks by harnessing the power of Dynamic QoS (DQoS). When used in
conjunction with compliant Policy Servers and Application Managers, PCMM gives operators the means
of tailoring their networks to accomplish these advantages:
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•
Deliver bandwidth dynamically and selectively
•
Support applications that require guaranteed bandwidth
•
Sustain a broad services mix and achieve optimal oversubscription
PCMM on the Cisco CMTS enhances several basic PacketCable functions, including the following:
•
Additional COPS Decision Messages—PCMM supports additional COPS decision messages, such
as the following. The new objects for messages, such as Gate-Set, Gate-Set-Ack and Gate-Info,
include different traffic profile definitions, different gate object formats, with additional objects for
gate state reporting and flow utilization.
– Gate-Set
– Gate-Set-Ack
– Gate-Set-Err
– Gate-Info
– Gate-Info-Ack
– Gate-Info-Err
– Gate-Delete
– Gate-Delete-Ack
– Gate-Delete-Err
– State-Report
•
Different COPS client and UDP port for COPS sessions—PCMM uses a different COPS client
type than does basic PacketCable, and PCMM uses a different UDP port for its COPS sessions. This
can help to distinguish between PacketCable and PCMM COPS sessions on the Cisco CMTS.
•
MultiMedia State Machine—PCMM supports a different MultiMedia state machine than does
PacketCable. The following are machine state changes introduced in PCMM with Cisco IOS
Release 12.3(13a)BC:
– PCMM gates are all unidirectional. In PacketCable, each gate is associated with both an
upstream and downstream service flow. Although unidirectional flows are allowed, a
bidirectional phone connection only has one gate.
PCMM differs in that each gate is now unidirectional, and is associated with only one service
flow. As a result, the gate info element structure in PCMM differs significantly from that of
PacketCable. PCMM only needs to maintain one set of service flow information, rather than
maintaining both upstream and downstream information as does PacketCable.
– DOCSIS DSX service flow information is now maintained on the Cisco CMTS. With
PacketCable, gates are authorized, reserved, or committed first on the Cisco CMTS with a
specific gate ID, and then the Cisco CMTS initiates a DSX exchange using the reserved or
committed gate ID in the message. With PacketCable, the cable modem must issue the DSX
message and create the service flows. However, with PCMM, when a gate is reserved or
committed, the DSX message is generated and sent immediately by the Cisco CMTS.
Therefore, the Policy Server sends all of the service flow information necessary to setup the
service flow to the Cisco CMTS instead of the cable modem. This causes a major change in the
state machine that controls the gate allocation procedures.
– New timer definitions and event actions are supported on PCMM. New timer definitions and
timer event actions are supported for proper behavior of the net state machine. Some of the
timers used with PacketCable have been eliminated, while the events associated with other
times have changed for PCMM.
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– New state transitions that did not exist in PacketCable 1.x have been added to PCMM.
Specifically, a gate can now be transitioned back from Committed to Authorized or Reserved
state.
– Cable interface line cards and broadband processing engines perform distributed DOCSIS
functions. The Cisco MC28U cable interface line card on the Cisco uBR7200 series routers, are
considered distributed, because the DOCSIS functionality is performed by the line card
processor. The GCP signaling for PCMM and the gate state machine will executed on the NPE
or RP processor. Because of the split in this functionality, IPC signaling resides between the
gate state machine and the DOCSIS layer processing.
•
Event management—Event management messages have been modified to include information on
the modified traffic profiles, and to match changes in the PCMM state machine. In addition, objects
have been added to help support Gate usage and Gate commit time objects, used for usage limit
based and time based gates.
For additional information about PacketCable and PacketCable Multimedia on the Cisco CMTS, refer to
the following documents on Cisco.com:
•
PacketCable and PacketCable Multimedia on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_pkcb.html.
•
Cisco PacketCable Primer White Paper
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_white_paper09186a0080179138
.shtml
“PacketCable is a CableLabs®-led initiative that is aimed at developing interoperable interface
specifications for delivering advanced, real-time multimedia services over two-way cable plant. Built on
top of the industry's highly successful cable modem infrastructure, PacketCable networks use Internet
protocol (IP) technology to enable a wide range of multimedia services, such as IP telephony,
multimedia conferencing, interactive gaming, and general multimedia applications.” (PacketCable.com)
CableLabs® describes key features of the PacketCable Multimedia IP service delivery framework as
follows:
•
Simple, powerful access to DOCSIS® 1.1 QoS mechanisms supporting both time and volume-based
network resource authorizations
•
Abstract, event-based network resource auditing and management mechanisms
•
A robust security infrastructure that provides integrity and appropriate levels of protection across all
interfaces
PacketCable™ is a registered trademark of CableLabs®. Additional information and specifications are
available online at the following CableLabs websites:
•
CableLabs PacketCable website
http://www.cablelabs.com/packetcable/
•
CableLabs PacketCable Multimedia specifications
http://www.cablelabs.com/packetcable/specifications/multimedia.html
Service Independent Intercept (SII) Support on the Cisco uBR7200 Series
The Cisco CMTS supports the Communications Assistance for Law Enforcement Act (CALEA) for
voice and data. Cisco IOS Release 12.3(13a)BC introduces support for Service Independent Intercept
(SII) on the Cisco uBR7200 CMTS. Cisco SII provides a more robust level of the lawful intercept (LI)
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options offered in the Packet Intercept feature. Cisco SII is the next level of support for judicially
authorized electronic intercept, to include dial access, mobile wireless, tunneled traffic, and Resilient
Transport Protocol (RTP) for voice and data traffic on the Cisco CMTS.
SII on the Cisco CMTS in Cisco IOS Release 12.3(13a)BC includes these functions:
•
Packet intercept on specified or unspecified interfaces or ports, including port lists
•
Packet intercept on virtual interface bundles
•
Corresponding SNMP MIB enhancements for each of these functions, as intercept requests are
initiated a mediation device (MD) using SNMPv3
Note
At the time of publication, the Cisco IOS Release 12.3BC release train does not support virtual private
networks with the SII feature. The CISCO-TAP-MIB does not specify any particular VPN, so this MIB
is not assigned to a particular instance of VPN routing/forwarding (VRF). For restrictions on this
platform, see “Overview of CISCO-TAP-MIB” in Cable Monitor and Intercept Features for the
Cisco CMTS. See Related Documentation, page 354.
Note
No new CLI commands are provided for this feature in Cisco IOS Release 12.3(13a)BC.
Cisco IOS Release 12.3(13a)BC enables full Multiple Service Operator (MSO) compliance with SII and
LI regulations. Service providers worldwide are legally required to allow government agencies to
conduct surveillance on the service provider's traditional telephony equipment. The objective of the SII
feature is to enable service providers with New World networks that legally allow government agencies
to conduct electronic network surveillance.
Lawful Intercept (LI) describes the process and judicial authority by which law enforcement agencies
conduct electronic surveillance of circuit and packet-mode communications. LI is authorized by judicial
or administrative order and implemented for either voice or data traffic on the Cisco CMTS.
Table 8 lists the differences between packet intercept and SII features
Table 8
Differences Between Packet Intercept and SII Features
Feature
Packet Intercept
Service Independent Intercept
Interface Type
Cable
Any
IP Masks
255.255.255.255 or 0.0.0.0
Any
L4 Ports
Any single port or 0-65535
Any port range
Protocol
UDP
Any
TOS/DSCP
Not supported
Supported
Additional Information
For additional information, refer to the following documents on Cisco.com:
•
Configuring COPS for RSVP, Cisco IOS Versions 12.2 and 12.3
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfcops_ps1835_TSD_Produ
cts_Configuration_Guide_Chapter.html.
•
Cable Monitor and Intercept Features for the Cisco CMTS
hhttp://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cmon.html.
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New and Changed Information
•
PacketCable and PacketCable Multimedia on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_pkcb.html.
•
Cisco PacketCable Primer White Paper
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_white_paper09186a0080179138
.shtml
Optional Upstream Scheduler Modes
With this feature, the user is able to select either Unsolicited Grant Services (UGS) or Real Time Polling
Service (rtPS) scheduling types, as well as packet-based or TDM-based scheduling. Low latency
queueing (LLQ) emulates a packet-mode-like operation over the Time Division Multiplex (TDM)
infrastructure of DOCSIS. As such, the feature provides the typical trade-off between packets and TDM:
with LLQ, the user has more flexibility in defining service parameters for UGS or rtPS, but with no
guarantee (other than statistical distribution) regarding parameters such as delay and jitter.
Restrictions
•
To ensure proper operation, Call Admission Control (CAC) must be enabled. When the Low Latency
Queueing (LLQ) option is enabled, it is possible for the upstream path to be filled with so many calls
that it becomes unusable, making voice quality unacceptable. CAC must be used to limit the number
of calls to ensure acceptable voice quality, as well as to ensure traffic other than voice traffic.
•
Even if CAC is not enabled, the default (DOCSIS) scheduling mode blocks traffic after a certain
number of calls.
•
Unsolicited Grant Services with Activity Detection (UGS-AD) and Non Real Time Polling Service
(nrtPS) are not supported.
cable upstream n scheduling type
Use this new command to turn the various scheduling modes on or off, where n specifies the upstream
port.
Router(config-if)# [no] cable upstream n scheduling type [ugs | rtps] mode [llq | docsis]
For additional information about scheduler enhancements on the Cisco CMTS, refer to the following
documents on Cisco.com:
•
Cisco CMTS Feature Guide — Configuring Upstream Scheduler Modes on the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/cmtsfg.html.
•
DOCSIS 1.1 for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/cmtsfg.html.
Transparent LAN Service and Layer 2 Virtual Private Networks
Cisco IOS Release 12.3(13a)BC introduces the following changes or requirements for the TLS feature
with Layer 2 VPNs:
•
When the TLS feature is used with Layer 2 VPNs, the participating cable modems must have the
Baseline Privacy Interface security feature (BPI) enabled. Otherwise, the Cisco CMTS drops such
Layer 2 traffic in the upstream or downstream.
•
Information about customer premises equipment (CPE) does not display in the output of the
show cable modem command.
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Note
Configuring ATM L2VPN or 802.1q for a particular cable modem removes any previous cable modem
configuration on the Cisco uBR7246VXR router. For example, if TLS with 802.1q is configured on the
router for a particular cable modem, and then you configure ATM L2VPN for the same cable modem,
the Cisco uBR7246VXR router supports the latter and removes the former with no additional warning
or system messages.
Refer to the following documents on Cisco.com for additional TLS information:
•
Transparent LAN Service Over Cable (configuration)
http://www.cisco.com/en/US/docs/cable/cmts/feature/tls-cmts.html.
•
TLS Over Cable (TAC Document #60027)
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_configuration_example09186a0
08029160d.shtml
Virtual Interface Bundling on the Cisco uBR-MC28/U BPE
Cisco IOS Release 12.3(13a)BC introduces support for virtual interface bundling on the
Cisco uBR72046VXR universal broadband router and the Cisco uBR-MC28/U Broadband Processing
Engine (BPE).
In prior Cisco IOS releases, cable interface bundling was limited to physical interfaces as master or slave
interfaces, and show commands did not supply bundle information.
Virtual interface bundling removes the prior concepts of master and slave interfaces, and introduces
these additional changes:
•
Virtual interface bundling uses bundle interface and bundle members instead of master and slave
interfaces.
•
The virtual bundle interface is virtually defined, as with IP loopback addresses, for example.
•
Virtual interface bundling supports bundle information in multiple show ip interface commands.
Virtual interface bundling prevents loss of connectivity on physical interfaces should there be a failure,
problematic online insertion and removal (OIR) of one line card in the bundle, or erroneous removal of
configuration on the master interface.
Virtual interface bundling supports and governs the following Layer 3 settings for the bundle member
interfaces:
Note
•
IP address
•
IP helper-address
•
source-verify and lease-timer functions
•
cable dhcp-giaddr (The giaddr field is set to the IP address of the DHCP client.)
•
Protocol Independent Multicast (PIM)
•
Access control lists (ACLs)
•
Sub-interfaces
This virtual interface for the bundle should always remain on (enabled with no shutdown), but the
Cisco CMTS provides warning messages prior to execution of the shutdown command.
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For configuration, examples, and general guidelines for virtual interface bundling on the Cisco CMTS,
refer to the following documents on Cisco.com:
•
Cable Interface Bundling and Virtual Interface Bundling for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/tls-cmts.html.
•
Virtual Interfaces and Frequency Stacking Configuration on MC5x20S and MC28U Line Cards
http://www.cisco.com/en/US/tech/tk86/tk804/technologies_white_paper09186a0080232b49.shtml
New Hardware Features in Cisco IOS Release 12.3(9a)BC8
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC8.
New Software Features in Cisco IOS Release 12.3(9a)BC8
There are no new software features supported in Cisco IOS Release 12.3(9a)BC8.
New Hardware Features in Cisco IOS Release 12.3(9a)BC7
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC7.
New Software Features in Cisco IOS Release 12.3(9a)BC7
There are no new software features supported in Cisco IOS Release 12.3(9a)BC7.
New Hardware Features in Cisco IOS Release 12.3(9a)BC6
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC6.
New Software Features in Cisco IOS Release 12.3(9a)BC6
There are no new software features supported in Cisco IOS Release 12.3(9a)BC6.
New Hardware Features in Cisco IOS Release 12.3(9a)BC5
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC5.
New Software Features in Cisco IOS Release 12.3(9a)BC5
There are no new software features supported in Cisco IOS Release 12.3(9a)BC5.
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New Hardware Features in Cisco IOS Release 12.3(9a)BC4
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC4.
New Software Features in Cisco IOS Release 12.3(9a)BC4
There are no new software features supported in Cisco IOS Release 12.3(9a)BC4.
New Hardware Features in Cisco IOS Release 12.3(9a)BC3
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC3.
New Software Features in Cisco IOS Release 12.3(9a)BC3
There are no new software features supported in Cisco IOS Release 12.3(9a)BC3.
New Hardware Features in Cisco IOS Release 12.3(9a)BC2
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC2.
New Software Features in Cisco IOS Release 12.3(9a)BC2
There are no new software features supported in Cisco IOS Release 12.3(9a)BC2.
New Hardware Features in Cisco IOS Release 12.3(9a)BC1
There are no new hardware features supported in Cisco IOS Release 12.3(9a)BC1.
New Software Features in Cisco IOS Release 12.3(9a)BC1
There are no new software features supported in Cisco IOS Release 12.3(9a)BC1.
New Hardware Features in Cisco IOS Release 12.3(9a)BC
There are no new hardware features in Cisco IOS Release 12.3(9a)BC.
New Software Features for Cisco IOS Release 12.3(9a)BC
This section describes the following new software features and CLI command changes for Cisco IOS
Release 12.3(9a)BC and the Cisco uBR7246VXR router:
•
Cable ARP Filter Enhancement, page 68
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•
Cisco Broadband Troubleshooter (CBT) 3.2, page 69
•
Cisco CMTS Static CPE Override, page 70
•
Cisco DDC (Dual DOCSIS Channel), page 70
•
Cisco IOS Release 12.3(9a)BC Command-Line Interface (CLI) Enhancements, page 71
•
DOCSIS Set-top Gateway (DSG) 1.0, page 71
•
Dynamic Shared Secret (DMIC) with OUI Exclusion for DOCSIS, page 71
•
MIBs Changes and Updates in Cisco IOS Release 12.3(9a)BC, page 72
•
Load Balancing Support, page 74
•
Spectrum Management Enhancements in Cisco IOS Release 12.3(9a)BC, page 75
•
Subscriber Traffic Management (STM) Version 1.1, page 75
•
Transparent LAN Services (TLS) and L2 Tunneling ATM/SIDs, page 75
•
Usage Based Billing (SAMIS), page 76
•
Virtual Interface Support and Frequency Stacking Support, page 76
Cable ARP Filter Enhancement
The cable arp filter command, introduced with Cisco IOS Release 12.2(15)BC2b, enables service
providers to filter ARP request and reply packets. This prevents a large volume of such packets from
interfering with the other traffic on the cable network.
Cisco IOS Release 12.3(9a)BC introduces enhanced command option syntax for the cable arp filter
command, where number and window-size values are optional for reply-accept and request-send
settings.
To control the number of Address Resolution Protocol (ARP) packets that are allowable for each Service
ID (SID) on a cable interface, use the cable arp command in cable interface configuration mode. To stop
the filtering of ARP broadcasts for CMs, use the no form of this command.
cable arp filter {reply-accept number window-size | request-send number window-size}
no cable arp filter {reply-accept | request-send}
default cable arp filter {reply-accept | request-send}
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Syntax Description
reply-accept number
window-size
request-send number
window-size
Configures the cable interface to accept only the specified number of ARP
reply packets every window-size seconds for each active Service ID (SID) on
that interface. The cable interface drops ARP reply packets for a SID that
would exceed this number.
•
number = (Optional) Number of ARP reply packets that is allowed for
each SID within the window time period. The allowable range is 0 to 20
packets, with a default of 4 packets. If number is 0, the cable interface
drops all ARP reply packets. If not specified, this value uses default.
•
window-size = (Optional) Size of the window time period, in seconds, in
which to monitor ARP replies. The valid range is 1 to 5 seconds, with a
default of 2 seconds.
Configures the cable interface to send only the specified number of ARP
request packets every window-size seconds for each active SID on that
interface. The cable interface drops ARP requests for a SID that would
exceed this number.
•
number = (Optional) Number of ARP request packets that is allowed for
each SID within the window time period. The allowable range is 0 to 20
packets, with a default of 4 packets. If number is 0, the cable interface
does not send any ARP request packets.
•
window-size = (Optional) Size of the window time period, in seconds, in
which to monitor ARP requests. The valid range is 1 to 5 seconds, with
a default of 2 seconds.
Cisco IOS Release 12.3(9a)BC also removes a prior caveat with HCCP Protect interfaces. Previously, in
the event of a revert-back HCCP N+1 switchover, manual removal of cable arp filter reply and
cable arp filter request configurations may have been required afterward on Protect interfaces.
For more information about ARP Filtering, refer to the following document on Cisco.com:
•
Cable ARP Filtering
http://www.cisco.com/en/US/docs/cable/cmts/feature/cblarpfl.html.
Cisco Broadband Troubleshooter (CBT) 3.2
Multiple Service Operators (MSOs) provide a variety of services such as TV, video on demand, data, and
voice telephony to subscribers. Cable companies provide a variety of services such as TV, video on
demand, data, and voice telephony to subscribers. Network Administrators and radio frequency (RF)
technicians need specialized tools to resolve RF problems in the cable plant. Cisco Broadband
Troubleshooter 3.2 (CBT 3.2) is a simple, easy-to-use tool designed to accurately recognize and resolve
such issues.
Cisco IOS Release 12.3(9a)BC enhances support for the Cisco Broadband Troubleshooter (CBT)
Version 3.2 on the Cisco uBR7246VXR universal broadband, with newly supported interoperability for
the following additional software features:
•
Spectrum Management Enhancements in Cisco IOS Release 12.3(9a)BC, page 75
•
Subscriber Traffic Management (STM) Version 1.1, page 75
CBT 3.2 offers the following enhancements on the Cisco uBR7246VXR router:
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New and Changed Information
•
CBT 3.2 resolves the former caveat CSCee03388. This enable users to compare an upstream and
cable modem on the same trace window.
Formerly, trace windows could support the selection of up to three upstream or cable modems, but
the upstream(s) and cable modems could not be mixed. CBT 3.2 now supports three upstreams or
cable modems to be selected and mixed in the trace window.
For additional information about CBT 3.2, spectrum management and STM 1.1, refer to the following
documents on Cisco.com:
•
Release Notes for Cisco Broadband Troubleshooter Release 3.2
http://www.cisco.com/en/US/products/sw/netmgtsw/ps530/prod_release_notes_list.html.
•
Spectrum Management for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_spec.html.
•
Subscriber Traffic Management for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubsubmon.html.
Cisco CMTS Static CPE Override
The cable submgmt default command enables Multiple Service Operators (MSOs) to override network
DHCP settings on CPE devices when performing troubleshooting with a laptop computer and console
connection to the Cisco universal broadband router.
For additional information about using the cable submgmt default command, refer to these documents
on Cisco.com:
•
Cisco CMTS Static CPE Override
http://www.cisco.com/en/US/docs/cable/cmts/feature/stat_cpe.html.
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
Cisco DDC (Dual DOCSIS Channel)
The Cisco Dual DOCSIS Channel (DDC) feature provides redundancy to cable voice and data customers
by using two or three CMTSs with connected RF upstreams and downstreams. Redundancy is provided
by controlling each CMTS on which the cable modems register, and by allowing movement of the cable
modems between the Cisco CMTS systems.
Cisco DDC provides redundancy during planned downtime, especially during software upgrades, with
minimal configuration or control external to the Cisco CMTS.
For information about configuring, maintaining and troubleshooting DDC on the Cisco uBR7246VXR
router, refer to the following document on Cisco.com:
•
Cisco Dual DOCSIS Channel (DDC) on the Cisco uBR7246VXR Universal Broadband Router
http://www.cisco.com/en/US/docs/cable/cmts/feature/docs_DDC.html.
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Cisco IOS Release 12.3(9a)BC Command-Line Interface (CLI) Enhancements
Cisco IOS Release 12.3(9a)BC supports the following new or enhanced command-line interface:
•
cable logging layer2events
•
cable source-verify
•
show cable tech-support
•
show controllers cable
•
show tech-support
For additional information about these command changes, refer to these resources:
•
“New and Changed Command Reference for Cisco IOS Release 12.3(9a)BC” section on page 92
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
DOCSIS Set-top Gateway (DSG) 1.0
The following DSG 1.0 features were added for multiple Cisco CMTS platforms:
•
Vendor names are supported to 20 characters per SNMP requirements (all platforms).
•
SNMP MIB support introduced for the DSG-IF-MIB.
•
Multicast MAC addresses are supported for DSG tunnels. DSG tunnel MAC addresses are no longer
limited only to unicast addresses.
•
DSG 1.0 prevents the configuration of any reserved or otherwise inappropriate IP multicast
addresses.
For additional information about configuring and using DSG 1.0 on the Cisco uBR7246VXR router,
refer to the following document on Cisco.com:
•
DOCSIS Set-Top Gateway for the Cisco CMTS
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a00802065c
8.html
Dynamic Shared Secret (DMIC) with OUI Exclusion for DOCSIS
Cisco IOS Release 12.3(9a)BC introduces the option of excluding the Organizational Unique Identifiers
(OUIs) from being subjected to the DMIC check. The new cable dynamic-secret exclude command
allow specific cable modems to be excluded from the Dynamic Shared Secret feature on the following
Cisco CMTS platforms:
•
Cisco uBR7246VXR universal broadband router
The Dynamic Shared Secret feature automatically creates a unique DOCSIS shared secret on a
per-modem basis, creating a one-time use DOCSIS configuration file that is valid only for the current
session. This ensures that a DOCSIS configuration file that has been downloaded for one cable modem
can never be used by any other modem, nor can the same modem reuse this configuration file at a later
time.
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This patent-pending feature is designed to guarantee that all registered modems are using only the
quality of service (QoS) parameters that have been specified by the DOCSIS provisioning system for
that particular modem at the time of its registration.
For additional command information, refer to the following documents on Cisco.com:
•
Configuring a Dynamic Shared Secret for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubrdmic.html
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
MIBs Changes and Updates in Cisco IOS Release 12.3(9a)BC
Cisco IOS Release 12.3(9a)BC adds the following new MIB support for the Cisco uBR7246VXR router.
•
CISCO-CABLE-QOS-MONITOR MIB
•
CISCO-CABLE-SPECTRUM-MIB
•
CISCO-PROCESS-MIB
•
DOCS-IF-MIB
•
DOCS-QOS-MIB
•
DSG-IF-MIB
For additional information about MIBs for the Cisco CMTS, refer to the following resources on
Cisco.com:
•
Cisco CMTS Universal Broadband Router MIB Specifications Guide
http://www.cisco.com/en/US/docs/cable/cmts/mib/reference/guide/ubrmib3.html
•
SNMP Object Navigator
http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en
CISCO-CABLE-QOS-MONITOR MIB
Cisco IOS Release 12.3(9a)BC introduces additional features for the CISCO-CABLE-QOS-MONITOR
MIB, including the following:
•
Clarified the descriptions of a number of objects.
•
Added a number of objects in the ccqmCmtsEnforceRuleTable to support DOCSIS 1.1 and DOCSIS
2.0 cable modems and to support peak and off-peak monitoring.
•
Added the ccqmCmtsIfBwUtilTable to provide thresholds for downstream/upstream bandwidth
utilization.
•
Deprecated and removed ccqmCmtsEnfRuleByteCount.
CISCO-CABLE-SPECTRUM-MIB
Cisco IOS Release 12.3(9) introduces support for the CISCO-CABLE-SPECTRUM-MIB on the
Cisco uBR7246VXR universal broadband router, with these additional MIB object enhancements:
•
ccsFlapListMaxSize and ccsFlapListCurrentSize SNMP objects provide additional description for
cable flap lists.
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•
Added the ccsCmFlapTable to replace the ccsFlapTable. The new object uses downstream, upstream
and Mac as indices to replace the ccsFlapTable object.
•
The enhanced ccsSNRRequestTable object provides a table of SNR requests with modified
description.
•
Added the ccsUpSpecMgmtUpperBoundFreq object to assist with spectrum management on the
Cisco CMTS.
•
Added the ccsCompliance5 object.
•
Added ccsCmFlapResetNow to reset the flap list for a particular cable modem.
•
Updated the descriptions for ccsFlapListMaxSize, ccsFlapListCurrentSize, and
ccsSNRRequestTable.
The following objects are also now deprecated:
•
ccsFlapPowerAdjustThreshold
•
ccsFlapMissThreshold
•
ccsFlapResetAll
•
ccsFlapClearAll
•
ccsFlapLastClearTime
The maximum number of entries in the flap-list was changed from a maximum of 8191 for the entire
router, to the following:
•
8191 entries for each Broadband Processing Engine (BPE) cable interface, such as the
Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U.
•
8191 maximum flap-list entries for all non-BPE cable interfaces, such as the Cisco uBR-MC16C,
Cisco uBR-MC16S, and Cisco uBR-MC28C.
Two objects are now used to track the flap list size:
•
ccsFlapListMaxSize—Reflects the flap list size, as configured by the cable flap-list size command.
•
ccsFlapListCurrentSize—Reflects the current size of the flap list for each MAC domain
(downstream).
CISCO-PROCESS-MIB
The CISCO-PROCESS-MIB enables you to monitor CPU and memory utilization for RF cards, cable
interface line cards and broadband processing engines on the Cisco CMTS. This information is collected
via SNMP.
DOCS-IF-MIB
The DOCS-IF-MIB (released as RFC 2670) has been updated to conform to the version 5 of the DOCSIS
2.0 RF MIB Specification (draft-ietf-ipcdn-docs-rfmibv2-05.txt).
DOCS-QOS-MIB
Cisco IOS Release 12.3(9a)BC introduces additional MIB object enhancements for the
DOCS-QOS-MIB on the Cisco uBR7246VXR routers:
•
Updated with the DOCSIS operations support system interface (OSSI) v2.0-N-04.0139-2.
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•
The default values of docsQosPktClassIpSourceMask and docsQosPktClassIpDestMask objects are
set to 0xFFFFFFFF.
DSG-IF-MIB
The DSG-IF-MIB defines objects that are used to configure, control, and monitor the operation of the
DOCSIS Set-top Gateway (DSG) 1.0 feature on Cisco uBR7200 series routers.
Note
The MODULE-IDENTITY for the DSG-IF-MIB is dsgIfMib, and its top-level OID is
1.3.6.1.4.1.9.9.999 (iso.org.dod.internet.private.enterprises.cisco.ciscoMgmt.dsgIfMib). Because this is
an experimental MIB, its top-level OID is expected to change when the DSG specifications are finalized.
MIB Constraints
The DSG-IF-MIB has the following constraints:
•
This is an experimental MIB that can be obsoleted and replaced without prior notice, when the DSG
specification is finalized.
•
This MIB is supported only in Cisco IOS Release 12.3(9a)BC and later releases. It is not supported
for the version of DSG that was implemented in Cisco IOS Release 12.2(15)BC1.
•
This MIB is not supported in Cisco IOS Release 12.1 EC.
Load Balancing Support
Cisco IOS Release 12.3(9a)BC introduces support for Load Balancing on the Cisco uBR7246VXR
router. The Load Balancing feature allows system operators to distribute cable modems across radio
frequency (RF) downstreams and upstreams, to maximize bandwidth and usage of the cable plant.
The Load Balancing feature allows service providers to optimally use both downstream and upstream
bandwidth, enabling the deployment of new, high-speed services such as voice and video services. This
feature also can help reduce network congestion due to the uneven distribution of cable modems across
the cable network and due to different usage patterns of individual customers.
By default, the Cisco CMTS platforms use a form of load balancing that attempts to equally distribute
the cable modems to different upstreams when the cable modems register. You can refine this form of
load balancing by imposing a limit on the number of cable modems that can register on any particular
upstream, using the cable upstream admission-control command.
However, this default form of load balancing affects the cable modems only when they initially register
with the Cisco CMTS. It does not dynamically rebalance the cable modems at later times, such as when
they might change upstream channels in response to RF noise problems, or when bandwidth conditions
change rapidly because of real-time traffic such as Voice over IP (VoIP) and video services. It also does
not affect how the cable modems are distributed among downstream channels.
For additional information about configuring Load Balancing on the Cisco CMTS, refer to the following
document on Cisco.com:
•
Configuring Load Balancing for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/troubleshooting_batch9/cmtslbg.html.
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Spectrum Management Enhancements in Cisco IOS Release 12.3(9a)BC
Cisco IOS Release 12.3(9a)BC introduces enhancements to spectrum management for the
Cisco uBR7246VXR router:
•
Supports the Cisco Broadband Troubleshooter (CBT) 3.2, page 69 (with caveats)
•
Supports Subscriber Traffic Management (STM) Version 1.1, page 75 (with caveats)
For additional information about CBT 3.2, spectrum management and STM 1.1, refer to the following
documents on Cisco.com:
•
Release Notes for Cisco Broadband Troubleshooter Release 3.2
http://www.cisco.com/en/US/products/sw/netmgtsw/ps530/prod_release_notes_list.html.
•
Spectrum Management for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_spec.html.
•
Subscriber Traffic Management for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubsubmon.html.
Subscriber Traffic Management (STM) Version 1.1
Cisco IOS Release 12.3(9a)BC introduces support for Subscriber Traffic Management (STM) Version
1.1 with the Cisco Broadband Troubleshooter (CBT) Version 3.2 on the Cisco uBR7246VXR universal
broadband router.
STM 1.1 extends earlier STM functions to monitor a subscriber's traffic on DOCSIS 1.1 primary service
flows and supports these additional features:
•
Cisco Broadband Troubleshooter (CBT) 3.2 supports STM 1.1.
•
DOCSIS 1.0-compliant and DOCSIS 1.1-compliant cable modem are supported.
•
Monitoring and application of traffic management policies are applied on a service-flow basis.
•
Monitoring window duration increased from seven to 30 days.
For additional information about STM 1.1 and Cisco CBT 3.2, refer to the following documents on
Cisco.com:
•
Subscriber Traffic Management for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubsubmon.html.
•
Release Notes for Cisco Broadband Troubleshooter Release 3.2
hhttp://www.cisco.com/en/US/products/sw/netmgtsw/ps530/prod_release_notes_list.html.
Transparent LAN Services (TLS) and L2 Tunneling ATM/SIDs
Cisco IOS Release 12.3(9a)BC introduces support for the Transparent LAN Service over Cable feature
on the Cisco uBR7246VXR router. This feature enhances existing Wide Area Network (WAN) support
to provide more flexible Managed Access for multiple Internet service provider (ISP) support over a
hybrid fiber-coaxial (HFC) cable network.
This feature allows service providers to create a Layer 2 tunnel by mapping an upstream service
identifier (SID) to an ATM permanent virtual connection (PVC) or a Virtual Local Area Network
(VLAN).
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MIBs
For additional information about configuring TLS on the Cisco uBR7246VXR router, refer to the
following document on Cisco.com:
•
Transparent LAN Service over Cable
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_configuration_example09186a0
08029160d.shtml
Usage Based Billing (SAMIS)
Cisco IOS Release 12.3(9a)BC introduces the Usage-Based Billing feature on the Cisco uBR7246VXR
universal broadband router. This feature provides subscriber account and billing information in the
Subscriber Account Management Interface Specification (SAMIS) format. SAMIS is specified by the
Data-over-Cable Service Interface Specifications (DOCSIS) Operations Support System Interface
(OSSI) specification.
For additional information about configuring and monitoring Usage-Based Billing (SAMIS) on the
Cisco uBR7246VXR CMTS, refer to the following document on Cisco.com:
•
Usage Based Billing for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/ubrsamis.html.
Virtual Interface Support and Frequency Stacking Support
Cisco IOS Release 12.3(9a)BC supports virtual interfaces and frequency stacking on the
Cisco uBR7246VXR router. Virtual interfaces allows a DS interface to be configured with up to 8 USs.
Frequency stacking allows two frequencies to be configured on one physical connector.
For additional information about frequency stacking and virtual interfaces on the Cisco uBR7246VXR
router, refer to the following document on Cisco.com:
•
Virtual Interfaces and Frequency Stacking Configuration on MC5x20S and MC28U Linecards
http://www.cisco.com/en/US/tech/tk86/tk804/technologies_white_paper09186a0080232b49.shtml.
MIBs
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use
Cisco MIB Locator found at the following URL:
http://tools.cisco.com/ITDIT/MIBS/servlet/index
If Cisco MIB Locator does not support the MIB information that you need, you can also obtain a list of
supported MIBs and download MIBs from the Cisco MIBs page at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
To access Cisco MIB Locator, you must have an account on Cisco.com. If you have forgotten or lost your
account information, send a blank e-mail to [email protected]. An automatic check will verify
that your e-mail address is registered with Cisco.com. If the check is successful, account details with a
new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com
by following the directions found at this URL:
http://tools.cisco.com/RPF/register/register.do
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Important Notes
MIB Changes and Enhancements for Cisco IOS Release 12.3(17a)BC:
MIB enhancements in Cisco IOS Release 12.3(17a)BC provide enhanced management features that
enable the Cisco uBR 7200 Series router to be managed through the Simple Network Management
Protocol (SNMP). These enhanced management features allow you to:
•
Use SNMP set and get requests to access information in Cisco CMTS universal broadband routers
•
Reduce the amount of time and system resources required to perform functions like inventory
management
•
A standards-based technology (SNMP) for monitoring faults and performance on the router
•
Support for SNMP versions (SNMPv1, SNMPv2c, and SNMPv3)
•
Notification of faults, alarms, and conditions that can affect services
To access the Cisco CMTS Universal Broadband Router MIB Specifications Guide, go to:
http://www.cisco.com/en/US/products/hw/cable/ps2217/prod_technical_reference_list.html.
Important Notes
The following sections contain important notes about Cisco IOS Release 12.3(23)BC6 that apply to
Cisco uBR7200 series universal broadband routers.
How to Upgrade to Cisco IOS Release 12.3(21)BC
In circumstances in which non-volatile memory (NVRAM) becomes corrupted on the Cisco CMTS,
configurations and feature behavior may become corrupted or lost, looping behavior in NVRAM may
result, and additional measures to resolve corrupted NVRAM and lost configurations would be required.
This issue can be generated by upgrading to later Cisco IOS releases from prior Cisco IOS releases that
do not contain resolution to a specific and known issue. This issue is not limited to Cisco IOS releases
installed on the Cisco universal broadband routers.
Symptoms of Corrupted NVRAM
This issue is displayed with the following symptoms in the case of the Cisco CMTS:
•
A router may display the following error message:
– NV: Invalid Pointer value(6357F3CC) in private configuration structure
This error message is displayed either when the router boots, or when you enter one of the following
commands:
•
write memory
•
copy running-config startup-config
•
copy file
•
nvram:startup-config
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Important Notes
Conditions of Corrupted NVRAM
This symptom is observed under the following conditions:
•
The Cisco router runs one of the following Cisco IOS Releases, as the outgoing image to be
upgraded:
– Interim Cisco IOS Release 12.3(19.7)
– Interim Cisco IOS Release 12.4(6.5)
– Interim Cisco IOS Release 12.4(6.5)T
– Certain later releases
When upgrading to Cisco IOS Release 12.3(21)BC, the following upgrade procedure prevents corruption
to NVRAM, retains configurations made in earlier releases, and successfully installs Cisco IOS Release
12.3(21)BC images. This procedure is subject to the feature restrictions and prerequisites of Cisco IOS
Release 12.3(21)BC, described in these release notes.
Prerequisites
Cisco strongly recommends that you back up your configuration files prior to performing this upgrade,
or any upgrade.
SUMMARY STEPS
Perform these steps to upgrade to Cisco IOS 12.3(21)BC, after TFTP file transfer operations are
complete.
1.
enable
2.
configure terminal
3.
erase /all nvram:
4.
write memory
5.
copy file
6.
reload
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Important Notes
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
erase /all nvram:
or
erase nvram:
The first command option for this step erases the entire
NVRAM.
Either of the final two command options erase only the
configuration files in NVRAM.
or
write erase
Example:
Router# erase /all nvram:
Step 4
(Optional) Copies the running configuration to startup
configuration.
write memory
Example:
Router# write memory
Step 5
This general step copies a saved configuration, if different
from the running configuration, to the startup configuration.
copy file
•
Example:
Router# copy ubr10k-k8p6-mz
Step 6
file—Cisco IOS image file for Cisco IOS Release
12.3(21)BC
Boots the router with the latest Cisco IOS release image.
reload
Example:
Router# reload
New Command Information for Cisco IOS Release 12.3(21)BC3
Cisco IOS Release 12.3(21)BC introduces support and modifications to the following commands for
Cisco Cable Modem Termination System (CMTS) universal broadband routers.
Refer to the following sections for more information:
•
controller modular-cable
•
clear cable modem reset
•
hw-module shutdown
•
show cable modem summary
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Important Notes
controller modular-cable
To enter controller configuration mode to configure the Cisco 1-Gbps Wideband SPA controller, use the
controller modular-cable command in global configuration mode.
controller modular-cable slot/subslot/bay
Syntax Description
slot
The slot where the Wideband SIP resides. On the Cisco uBR10012 router,
slots 1 and 3 can be used for the Wideband SIP.
subslot
The subslot where the Wideband SIP resides. On the Cisco uBR10012
router, subslot 0 is always specified.
bay
The bay in the Wideband SIP where the Wideband SPA is located. Valid
values are 0 (upper bay) and 1 (lower bay).
Defaults
No Wideband SPA controller is configured.
Command Modes
Global configuration mode.
Command History
Release
Modification
12.3(21)BC
This command was introduced on the Cisco uBR10012 universal broadband
router.
Usage Guidelines
This command indicates where the Wideband SPA that will be configured is located and enters controller
configuration mode.
Examples
The following example shows how to enter controller configuration mode for the Wideband SPA in
slot 1, subslot 0, and bay 0.
Router# configure terminal
Router(config)# controller modular-cable 1/0/0
Router(config-controller)#
Router#
Related Commands
Command
Description
annex modulation
Sets the annex and modulation for the Wideband SPA.
ip-address
Sets the IP address of the Wideband SPA’s FPGA
rf-channel
Configures an RF channel on a Wideband SPA.
rf-channel cable downstream
channel-id
Assigns a downstream channel ID to an RF channel.
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Important Notes
Command
Description
cable rf-channel
Associates an RF channel on a Wideband SPA with a wideband
channel.
modular-host subslot
Specifies the modular-host line card for Wideband protocol
operations.
clear cable modem reset
To remove one or more CMs from the Station Maintenance List and reset them, use the clear cable
modem reset command in privileged EXEC mode.
clear cable modem {mac-addr | ip-addr | [cable slot/port] {all | oui string | reject} } reset
clear cable modem {mac-addr | ip-addr | [cable slot/subslot/port] {all | oui string | reject |
wideband registered-traditional-docsis} } reset
Syntax Description
mac-addr
Specifies the 48-bit hardware address (MAC address) of an
individual CM, or of any CPE devices or hosts behind that CM.
ip-addr
Specifies the IP address of an individual CM, or of any CPE devices
or hosts behind that CM.
cable slot/port
(Optional) Identifies the a interface and downstream port on the
Cisco uBR7100 series and Cisco uBR7200 series routers.
On the Cisco uBR7100 series router, the only valid value is 1/0. On
the Cisco uBR7200 series router, slot can range from 3 to 6, and port
can be 0 or 1, depending on the cable interface.
cable slot/subslot/port
Defaults
(Optional) Identifies a cable interface on the Cisco uBR10012
router. The following are the valid values:
•
slot = 5 to 8
•
subslot = 0 or 1
•
port = 0 to 4 (depending on the cable interface)
all
Removes all the CMs from the Station Maintenance List. (This
option is valid only on the Release 12.1 EC train.)
oui string
Removes and resets all CMs that match the specified Organization
Unique Identifier (OUI). The string parameter can be either the three
byte hexadecimal string (such as 00.00.0C) or a vendor name that
has been defined using the cable modem vendor command.
reject
Removes and resets all CMs that are currently in one of the reject
states (see the description of these states in the show cable modem
command).
wideband
registered-traditional-docsis
If you specify wideband, removes and resets all wideband CMs. If
you specify wideband registered-traditional-docsis, removes and
resets all wideband CMs that are registered as traditional DOCSIS
modems.
No default behavior or values
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Important Notes
Command Modes
Privileged EXEC
Command History
Release
Modification
12.1(2) EC
This command was introduced.
12.2(4)BC1
Support was added to the Release 12.2 BC train.
12.2(11)BC2
Support was added for the oui and reject options.
12.2(11)BC3
The all option was removed from the Release 12.2 BC train, and replaced
with the interface option.
12.2(15)BC1
The cable interface was made an optional keyword for this command.
12.3(21)BC
Support was added for the wideband and registered-traditional-docsis
keywords.
Usage Guidelines
This command instructs the Cisco CMTS to stop sending DOCSIS station maintenance messages to one
or more CMs, which effectively terminates the link to those CMs. A CM responds to this by resetting
itself. Depending on when the CM received the last station maintenance message, it can take up to 30
seconds before the CM detects the missing station maintenance messages and resets itself.
In some circumstances, the customer premises equipment (CPE) devices behind a CM stops receiving
traffic after the CM is reset. This is because the CMTS still has the CPE device listed in its address tables,
but the CM does not after being reset, so the traffic passes through the CMTS but is dropped by the CM.
To resolve this situation, the CPE device should simply send some type of traffic to the CM, such as a
ping packet. (You can also resolve this situation by using the clear arp-cache command on the
Cisco CMTS router to clear the router’s address table, but this is not recommended, because it
temporarily interrupts all traffic on the router.)
Note
Caution
Tip
Examples
The clear cable modem all reset command can result in the CPU utilization temporarily reaching
100 percent for a couple of minutes, as the CPU processes the command for all CMs. The CPU
utilization will return to normal within a couple of minutes.
The clear cable modem all reset command should normally be used only on a test or lab network. If
used on a large network, it could impact service for a significant period of time, as it would force all
CMs to simultaneously reset and reregister with the Cisco CMTS.
You can also specify the MAC address or IP address for a CPE device or host, and the Cisco CMTS resets
the CM that is associated with that CPE device in its internal database.
The following example shows how to reset the CM at 172.23.45.67:
Router# clear cable modem 172.23.45.67 reset
Router#
The following example shows how to reset all CMs that have a OUI that has been defined as having the
vendor name of Cisco using the cable modem vendor command:
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Important Notes
Router# clear cable modem oui Cisco reset
Router#
The following example shows how to reset all CMs that are currently in one of the reject states:
Router# clear cable modem reject reset
Router#
The following example shows how to reset all wideband CMs that are registered as traditional DOCSIS
modems.:
Router# clear cable modem wideband registered-traditional-docsis reset
MAC Address
IP Address
I/F
MAC
Prim BG DSID
State
Sid
ID
0018.6852.825c 80.18.0.9
C5/0/0/U0 online
1
0
256
0018.6852.8286 80.18.0.10
C5/0/0/U0 online
2
0
264
0016.92fb.55be 80.18.0.7
C5/0/0/U0 online
3
0
288
0016.92f0.9104 80.18.0.5
C5/0/0/U0 online
4
0
280
0016.92fb.55c0 80.18.0.6
C5/0/0/U0 online
5
0
272
MD-DS-SG
N/A
N/A
N/A
N/A
N/A
Router#
Related Commands
Command
Description
clear cable flap-list
Resets the flap-list table for a specific CM or for all CMs.
clear cable modem
counters
Resets the flapping counters of a CM to zero.
clear cable modem
delete
Removes one or more CMs from the internal address and routing tables.
clear cable modem
lock
Resets the lock on one or more CMs.
clear cable modem
offline
Removes all offline CMs from the internal address and routing tables, or
clears all flap list counters for offline CMs.
show cable modem
Displays the current status for one or more CMs.
hw-module shutdown
To shut down a particular Performance Routing Engine (PRE1) module, line card, Wideband SIP or
Wideband SPA, use the hw-module shutdown command in global configuration mode. To activate a
specific PRE1, line card, Wideband SIP or Wideband SPA, use the no form of this command.
hw-module {main-cpu | pre {A|B} | sec-cpu | slot slot-number | subslot slot/subslot |
bay slot/subslot/bay} shutdown [unpowered]
no hw-module {main-cpu | pre {A|B} | sec-cpu | slot slot-number | subslot slot/subslot |
bay slot/subslot/bay} shutdown
Syntax Description
main-cpu
Shuts down the PRE1 module that is currently acting as the active PRE1
module.
pre {A|B}
Shuts down the PRE1 module that is physically in either PRE slot A (left
slot) or PRE slot B (right slot).
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Important Notes
sec-cpu
Shuts down the PRE1 module that is currently acting as the standby PRE1
module.
slot slot-number
Shuts down the line cards that are physically present in the specified
slot-number (valid range is 1 to 8).
subslot slot/subslot
Shuts down the line card or SIP that is physically present in the slot with the
specified slot and subslot numbers. The following are the valid values:
bay slot/subslot/bay
unpowered
•
slot = 1 to 8
•
subslot = 0 or 1
Shuts down the SPA in the location specified by the slot/subslot/bay
argument. The following are the valid values:
•
slot = 1 to 3
•
subslot = 0 or 1 (0 is always specified)
•
bay = 0 (upper bay) or 1 (lower bay)
Used with the Wideband SPA, shuts down the SPA and its interfaces, and
leaves them in an administratively down state without power.
Defaults
No default behavior or values
Command Modes
Global configuration
Command History
Release
Modification
12.2(4)XF
This command was introduced for the Cisco uBR10012 router.
12.3(21)BC
Support was added for the Cisco Wideband SIP and Cisco 1-Gbps
Wideband SPA.
Usage Guidelines
Caution
Examples
The hw-module shutdown command shuts down a particular Performance Routing Engine (PRE1)
module, line card, Wideband SIP or Wideband SPA. To activate a specific PRE1, line card, Wideband
SIP, or Wideband SPA, use the no form of this command.
Shutting down the active PRE1 module will trigger a switchover, so that the standby PRE1 module
becomes the active PRE1 module.
The following example shows the standby PRE1 module being shut down:
Router(config)# hw-module sec-cpu shutdown
Router(config)#
The following example shows the active PRE1 module being shut down (which will trigger a switchover
to the standby PRE1 module):
Router(config)# hw-module main-cpu shutdown
Router(config)#
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Important Notes
The following example shows the PRE1 module in PRE1 slot B being shut down:
Router(config)# hw-module pre B shutdown
Router(config)#
Note
The hw-module pre B shutdown command shuts down the PRE1 module that is physically present in
slot B, regardless of whether the module is the active or standby PRE1 module.
The following example shows how to deactivate and verify deactivation for the Cisco Wideband SPA
located in slot 1, subslot 0, bay 0. In the output of the show hw-module bay oir command, notice the
“admin down” in the Operational Status field.
Router# configure terminal
Router(config)# hw-module bay 1/0/0 shutdown unpowered
%SPAWBCMTS-4-SFP_MISSING: Wideband-Cable 1/0/0, 1000BASE-SX SFP missing from port 0
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:1, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:2, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:3, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:4, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:5, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:6, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:7, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:8, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:9, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:10, changed state to down
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:11, changed state to down
...
Router# show hw-module bay 1/0/0 oir
Module
Model
Operational Status
-------------- ------------------ ------------------------bay 1/0/0
SPA-24XDS-SFP
admin down
The following example shows how to activate and verify activation for the Cisco Wideband SPA located
in slot 1, subslot 0, bay 0. In the output of the show hw-module bay oir command, notice the “ok” in
the Operational Status field.
Router# configure terminal
Router(config)# no hw-module bay 1/0/0 shutdown
%SPAWBCMTS-4-SFP_OK: Wideband-Cable 1/0/0, 1000BASE-SX SFP inserted in port 0
%SPAWBCMTS-4-SFP_LINK_OK: Wideband-Cable 1/0/0, port 0 link changed state to up
%SNMP-5-LINK_UP: LinkUp:Interface Wideband-Cable1/0/0:0 changed state to up
%LINK-3-UPDOWN: Interface Cable1/0/0:0, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:1, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:2, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:3, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:4, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:5, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:6, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:7, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:8, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:9, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:10, changed state to up
%LINK-3-UPDOWN: Interface Wideband-Cable1/0/0:11, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Wideband-Cable1/0/0:0, changed state to up
...
Router# show hw-module bay 1/0/0 oir
Module
Model
Operational Status
-------------- ------------------ ------------------------bay 1/0/0
SPA-24XDS-SFP
ok
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Important Notes
Related Commands
Command
Description
hw-module reset
Resets a PRE1 module or line card.
hw-module reload
Reloads the software in and restarts a Cisco 1-Gbps Wideband SPA.
redundancy
force-failover
main-cpu
Forces a manual switchover between the active and standby PRE1 modules.
show cable modem summary
To display a summary of CMs on one or more cable interfaces, use the show cable modem command in
privileged EXEC mode.
show cable modem summary [total]
show cable modem summary interface1 [interface2] total
show cable modem summary interface1 [interface2] upstream port1 port2 total
show cable modem cable slot/port [upstream port] summary
show cable modem cable slot/subslot/port [upstream port] summary
Syntax Description
total
(Optional) Displays a footer line showing the totals for each column.
interface1
(Optional) Cable interface to be summarized. The interface1 parameter can
take the following forms:
interface2
•
cable slot/port—On the Cisco uBR7100 series router, the only valid
value is 1/0. On the Cisco uBR7200 series router, slot can range from 3
to 6, and port can be 0 or 1, depending on the cable interface.
•
cable slot/subslot/port—On the Cisco uBR10012 router, slot can range
from 5 to 8, subslot can be either 0 or 1, and port can range from 0 to 4
(depending on the interface).
(Optional) Second cable interface, specifying a range of cable interfaces to
be summarized. The interface2 parameter has the same form as interface1.
Note
Command Modes
When specifying a range of cable interfaces, interface1 must be the
lower-numbered interface and interface2 must be the
higher-numbered interface.
upstream port1 port2
(Optional) Specifies a range of upstream ports on the cable interfaces to be
summarized. The port1 and port2 parameters can start at 0, and port2 must
be a higher-numbered port than port1.
upstream port
(Optional) Specifies a specific upstream port to be summarized. This option
can be specified only when summarizing a single cable interface.
Privileged EXEC
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Important Notes
Command History
Usage Guidelines
Examples
Release
Modification
11.3XA
This command was introduced.
12.1(4)CX and
12.2(4)BC1
Support was added for the Cisco uBR10012 router.
12.1(6)EC
The total option was supported for the Cisco uBR7100 series and
Cisco uBR7200 series routers.
12.1(11b)EC
The upstream Description field was added to the show cable modem
summary display in Cisco IOS Release 12.1 EC.
12.2(8)BC1
The total option was supported for the Cisco uBR10012 universal
broadband router.
12.2(15)BC2
The upstream Description field was added to the show cable modem
summary display in Cisco IOS Release 12.2 BC.
12.3(21)BC
Support was added for wideband modem output.
This command displays a summary of CMs for a single cable interface or upstream, or for a range of
cable interfaces or upstreams. The following possible combinations are possible for this command:
•
show cable modem summary total—Displays a summary and a total for all CMs on the chassis.
•
show cable modem summary cable x/0 total—Displays a summary of CMs on a specified card.
•
show cable modem summary cable x/0 upstream port1 port2 total—Displays a summary of CMs
on the specified card and specified range of ports. The port1 value must be less than the port2 value.
•
show cable modem summary cable x/0 cable y/0 total—Displays a summary of CMs on the
specified range of cards.
•
show cable modem summary cable x/0 cable y/0 upstream port1 port2 total—Displays a
summary of CMs on the specified range of ports on the specified range of cards.
The following example shows typical output for the default form of the show cable modem summary
command on a Cisco uBR7200 series router:
Router# show cable modem summary
Interface
Cable3/0/U0
Cable3/0/U1
Cable3/0/U2
Cable3/0/U3
Cable5/0/U0
Cable6/0/U0
Total
Modems
165
209
262
256
746
806
Active
Modems
141
172
207
194
714
764
Registered
Modems
141
170
203
188
711
759
Description
Line
Line
Line
Line
Line
Line
32/1
32/2
32/3
32/4
41/1
42/2
Router#
Note
The Description field appears in Cisco IOS Release 12.1(11b)EC, 12.2(15)BC2, and later releases, and
shows the string configured for the upstream using the cable upstream description command.
The following example shows typical output for the show cable modem summary command with the
total option on a Cisco uBR7200 series router:
Router# show cable modem summary total
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Important Notes
Interface
Cable5/0/U0
Cable6/0/U1
Total
Modems
746
806
Active
Modems
714
764
1552
1478
Total:
Registered
Modems
711
759
Description
Node1
Node3
1470
Router#
The following example shows sample output for the show cable modem summary command with the
total option for a Cisco uBR10012 router:
Router# show cable modem summary total
Interface
Cable Modem
Total Reg
Unreg Offline Wideband
C5/0/0/U0
84
84
0
0
84
C5/0/0/U1
84
84
0
0
84
C5/0/0/U2
83
83
0
0
83
C5/0/0/U3
83
83
0
0
83
<<output omitted>>
Total:
8020
8020
0
0
8016
initRC
0
0
0
0
initD
0
0
0
0
Description
initIO initO
0
0
0
0
0
0
0
0
0
0
0
0
Router#
The following example shows sample output for the show cable modem summary total command for
a range of interfaces on the Cisco uBR10012 router:
Router# show cable modem summary c5/1/1 c5/1/2
Interface
Cable Modem
Total Reg
Unreg Offline Wideband
C5/1/1/U0
84
84
0
0
84
C5/1/1/U1
84
84
0
0
83
C5/1/1/U2
83
83
0
0
83
C5/1/1/U3
83
83
0
0
83
C5/1/2/U0
84
84
0
0
84
C5/1/2/U1
84
84
0
0
84
C5/1/2/U2
83
83
0
0
83
C5/1/2/U3
83
83
0
0
83
total
initRC
0
0
0
0
0
0
0
0
initD
0
0
0
0
0
0
0
0
Description
initIO initO
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Total:
0
0
0
668
668
0
0
667
0
Router#
The following example shows sample output for the show cable modem summary total command for
a range of interfaces and upstreams on the Cisco uBR10012 router:
Router# show cable modem summary c5/1/1 c5/1/2
Interface
Cable Modem
Total Reg
Unreg Offline Wideband
C5/1/1/U0
84
84
0
0
84
C5/1/1/U1
84
84
0
0
83
C5/1/2/U0
84
84
0
0
84
C5/1/2/U1
84
84
0
0
84
upstream 0 1 total
Description
initRC initD initIO initO
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Total:
0
336
336
0
0
335
0
0
0
Router#
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Important Notes
Note
When displaying a summary for a range of ports or cable interfaces, the first port or cable interface (for
example, u0 or c4/0) must be lower-numbered than the second port or interface (for example, u6 or c6/0).
If you specify the higher-numbered port or interface first, the display shows no CMs connected.
Table 10 describes the fields shown in the show cable modem summary displays:
Table 9
Descriptions for the show cable modem summary Fields
Field
Description
Interface
The cable interface line card providing the upstream for the CMs.
Total Modems or Total Total number of CMs, registered, unregistered, and offline for this interface.
Registered Modems or Total number of CMs that have registered and are online on this interface.
Reg
This number might be different from the Total Modems number if some
modems are offline or not fully registered.
Unregistered Modems
Total number of CMs that are either offline and not currently communicating
with the CMTS, or attempting to come online but are not yet registered.
Offline
Total number of CMs that were online or attempted to register but are no
longer communicating with the CMTS.
Wideband
CM is registered as a wideband CM.
init(rc)
MAC state of CM is init(rc).
init(d)
MAC state of CM is init(d).
init(io)
MAC state of CM is init(io).
init(o)
MAC state of CM is init(o).
Description
Description entered for this upstream using the cable upstream description
command.
Note
For information on MAC states, see the show cable modem command.
Tip
In Cisco IOS Release 12.1(12)EC, Release 12.2(8)BC1, and later releases, you can add a timestamp to
show commands using the exec prompt timestamp command in line configuration mode.
Related Commands
Command
Description
show cable modem
Displays information for the registered and unregistered CMs.
show cable modem
access-group
Displays the access groups for the CMs on a particular cable interface.
show cable modem
calls
Displays voice call information for a particular CM, identified either by its
IP address or MAC address.
show cable modem
connectivity
Displays connectivity statistics for one or more CMs.
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Important Notes
Command
Description
show cable modem
counters
Displays downstream and upstream traffic counters for one or more CMs.
show cable modem
cpe
Displays the CPE devices accessing the cable interface through a particular
CM.
show cable modem
offline
Displays a list of the CMs that are marked as offline with the Cisco CMTS.
show cable modem
registered
Displays a list of the CMs that are marked as registered with the
Cisco CMTS.
show cable modem
remote-query
Displays information collected by the remote-query feature.
show cable modem
unregistered
Displays a list of the CMs that are marked as unregistered with the
Cisco CMTS.
show cable modem
vendor
Displays the vendor name or Organizational Unique Identifier (OUI) for the
CMs on each cable interface.
show interface cable
modem
Displays information about the CMs connected to a particular cable
interface.
show interface cable
sid
Displays cable interface information.
show cable modem
wideband
Displays information for a wideband CMs.
Restriction for Cisco IOS Release 12.3(17a)BC
Cisco IOS Release 12.3(17a)BC with the Cisco uBR7246VXR router does not support overlapping IP
addresses with MPLS-VPN.
For additional information about the Cable Intercept feature, cable interface bundling, or virtual master
interfaces in cable interface bundling, refer to the following documents on Cisco.com:
•
Cable Interface Bundling and Virtual Interface Bundling for the Cisco CMTS
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_bund.html.
•
Cable Monitor and Intercept Features for the Cisco CMTS
hhttp://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_cmon.html.
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
New Command Information for Cisco IOS Release 12.3(13a)BC3
Cisco IOS Release 12.3(13a)BC3 introduces support for the debug cable classifier command, which
displays debugging information supporting DOCSIS packet classifiers.
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debug cable classifiers
To display debugging messages for DOCSIS packet classifiers, use the debug cable classifiers
command in privileged EXEC mode. To stop the display of debugging messages, use the no form of this
command.
debug cable classifiers
no debug cable classifiers
Syntax Description
No additional keywords or syntax components are required.
Command Modes
Privileged EXEC mode
Defaults
DOCSIS packet classifier debugging is disabled by default.
Command History
Release
Modification
12.3(13a)BC3
This command was introduced on the Cisco uBR10012 and
Cisco uBR7246VXR universal broadband routers.
Usage Guidelines
The debug cable classifiers command provides detailed information about the allocation, removal,
activation and deactivation of packet classifiers. Generally, classifiers are used to identify IP packets by
source port, destination port, or type of service. Classifiers are associated with service flows. For
example, packet classifiers are dynamically created in most VOIP deployments and this debug command
can be used to troubleshoot issues related to these classifiers as VOIP calls are created and torn down.
Because this command can produce a large volume of debug information, use this command only when
you have also enabled debugging for a particular MAC address, set of MAC addresses, or a MAC address
mask, using the debug cable mac-address command.
For additional debug command information, refer to the following document on Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
Examples
The following example enables classifier debugging for a single MAC address:
Router# debug cable mac-address 000a.73fa.dbaa
Router# debug cable classifiers
CMTS Packet Classifiers debugging is on
The following enables classifier debugging for all MAC addresses with Organizational Unique Identifier
(OUI) OUI 0013.11:
Router# debug cable mac-addr 0013.1100.0000 ffff.ff00.0000
Router# debug cable classifiers
CMTS Packet Classifiers debugging is on
The following example illustrates sample output of the debug cable classifiers command for the given
MAC addresses:
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Feb 7 18:43:50.181: CFR cmts_deactivate_us_srv_flow_act_cfrs 000a.73fa.dbaa sid 1 sfid 3
st 2 dir 0 prov 1 adm 1 act 1
Feb 7 18:43:50.181: CFR cmts_remove_cm_srv_flow_cfrs 000a.73fa.dbaa sid 1 sfid 3 st 2 dir
0 prov 1 adm 0 act 0
Feb 7 18:43:50.181: CFR cmts_deactivate_ds_srv_flow_act_cfrs 000a.73fa.dbaa sid 0 sfid 4
st 2 dir 1 prov 2 adm 2 act 2
Feb 7 18:43:50.181: CFR cmts_remove_cm_srv_flow_cfrs 000a.73fa.dbaa sid 0 sfid 4 st 2 dir
1 prov 2 adm 0 act 0
Feb 7 18:43:50.181: CFR cmts_deactivate_us_srv_flow_act_cfrs 000a.73fa.dbaa sid 1 sfid 3
st 2 dir 0 prov 3 adm 0 act 0
Feb 7 18:43:50.181: CFR cmts_deactivate_us_srv_flow_act_cfrs 000a.73fa.dbaa sid 1 sfid 3
st 1 dir 0 prov 3 adm 3 act 0
Feb 7 18:43:50.181: CFR cmts_activate_us_srv_flow_act_cfrs 000a.73fa.dbaa sid 1 sfid 3 st
2 dir 0 prov 3 adm 3 act 3
Feb 7 18:43:50.181: CFR cmts_deactivate_ds_srv_flow_act_cfrs 000a.73fa.dbaa sid 0 sfid 4
st 2 dir 1 prov 4 adm 0 act 0
Feb 7 18:43:50.181: CFR cmts_deactivate_ds_srv_flow_act_cfrs 000a.73fa.dbaa sid 0 sfid 4
st 1 dir 1 prov 4 adm 4 act 0
Feb 7 18:43:50.181: CFR cmts_activate_ds_srv_flow_act_cfrs 000a.73fa.dbaa sid 0 sfid 4 st
2 dir 1 prov 4 adm 4 act 4
Feb 7 18:43:50.181: CFR cmts_set_cfr_params 000a.73fa.dbaa cfrid 1 pri 0 ord 0 dir 0 st 2
phsi 0
Feb 7 18:43:50.181: CFR cmts_activate_cfr 000a.73fa.dbaa cfrid 1 pri 1 ord 0 dir 0 st 2
Feb 7 18:43:50.181: CFR cmts_add_pkt_cfr 000a.73fa.dbaa cfrid 1 pri 1 ord 0 dir 0 st 1
phsi 0
Feb 7 18:43:50.181: CFR cmts_handle_cfr_parsed_data CFR_ADD 000a.73fa.dbaa sfid 0 action
0 dir 0 type 0 cfrid 0 pri 1 ord 0 dir 0 st 1 phsi 0
Feb 7 18:43:50.181: CFR cmts_set_cfr_params 000a.73fa.dbaa cfrid 2 pri 0 ord 0 dir 1 st 2
phsi 0
Feb 7 18:43:50.181: CFR cmts_activate_cfr 000a.73fa.dbaa cfrid 2 pri 1 ord 0 dir 1 st 2
Feb 7 18:43:50.181: CFR cmts_add_pkt_cfr 000a.73fa.dbaa cfrid 2 pri 1 ord 1 dir 1 st 1
phsi 0
Feb 7 18:43:50.181: CFR cmts_handle_cfr_parsed_data CFR_ADD 000a.73fa.dbaa sfid 0 action
0 dir 1 typ
Related Commands
Command
Description
debug cable dynsrv
Displays information about DOCSIS 1.1 dynamic service flow messages.
debug cable qos
Activates quality-of-service (QoS) debugging.
New and Changed Command Reference for Cisco IOS Release 12.3(9a)BC
Cisco IOS Release 12.3(9a)BC introduces support or enhanced performance for the following Cisco IOS
command-line interface (CLI) commands on the Cisco uBR7246VXR router:
•
cable logging layer2events
•
cable source-verify
•
cable submgmt default
•
show cable tech-support
•
show controllers cable
•
show tech-support
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cable logging layer2events
To save DOCSIS events that are specified in Cable Device MIB to the cable logging buffer (instead of
to the general logging buffer), use the cable logging layer2events command in global configuration
mode. To disable the logging of DOCSIS events to the cable logging buffer, use the no form of this
command.
cable logging layer2events
no cable logging layer2events
Syntax Description
This command has no additional arguments or keywords.
Defaults
DOCSIS events are saved to the general logging buffer on the Cisco CMTS by default.
Command Modes
Global configuration mode
Command History
Release
Modification
12.3(9a)BC
This command was introduced on the Cisco uBR10012 and
Cisco uBR7246VXR universal broadband routers.
Usage Guidelines
Use the show cable logging command to check whether the logging feature is enabled and the status of
the logging buffer.
Examples
The following example shows how to clear the log buffer that contains a bad IP source address error
messages:
Router# show cable logging summary
Cable logging: BADIPSOURCE Enabled
Total buffer size (bytes): 1000000
Used buffer size (bytes) : 36968
Logged messages : 231
Router# clear cable logging badipsource
Router# show cable logging summary
Cable logging: BADIPSOURCE Enabled
Total buffer size (bytes): 1000000
Used buffer size (bytes) : 0
Logged messages : 0
Related Commands
Command
Description
cable logging badipsource
Logs error messages about bad IP source addresses on the cable
interfaces to a separate log buffer,
show cable logging
Indicates whether the logging feature is enabled and the status of the
logging buffer.
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Important Notes
For additional information about logging events on the Cisco CMTS, refer to the following document on
Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
cable source-verify
To enable verification of IP addresses or service IDs (SIDs) for CMs and CPE devices on the upstream,
use the cable source-verify command in global configuration, cable interface configuration or
subinterface configuration modes. To disable verification, use the no form of this command.
Cable Interface and Subinterface Configuration Modes
cable source-verify [dhcp | leasetimer value | leasequery-filter upstream query-num interval]
no cable source-verify
Global Configuration Mode
cable source-verify leasequery-filter downstream query-num interval
no cable source-verify
Syntax Description
dhcp
(Optional) Specifies that queries will be sent to verify unknown source IP
addresses in upstream data packets.
Note
leasetimer value
(Optional) Specifies the time, in minutes, for how often the router should
check its internal CPE database for IP addresses whose lease times have
expired. The valid range for value is 1 to 240 minutes, with a default of
60 minutes.
Note
leasequery-filter
upstream query-num
interval
leasequery-filter
downstream
query-num interval
Do not enable the local DHCP server on the Cisco CMTS and
configure local DHCP address pools, using the ip dhcp pool
command, when using this option, because this prevents DHCP
address validation.
The leasetimer option takes effect only when the dhcp option is
also used on an interface. Also, this option is supported only on the
master interface and cannot be configured on subinterfaces.
Configuring it for a master interface automatically applies it to all
subinterfaces.
(Optional) Enables upstream lease queries to be defined on a per-SID basis
to reduce the chance of Denial of Service attacks.
•
query-num— Number of leased queries per SID.
•
interval—Size of timer window in seconds.
(Optional) Enables downstream lease queries to be defined on a per-SID
basis to reduce the chance of Denial of Service attacks.
•
query-num— Number of leased queries for an unknown SID.
•
interval—Size of timer window in seconds.
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Defaults
Disabled. When the dhcp option is specified, the leasetimer option is set by default to 60 minutes.
Command Modes
Global configuration, Cable interface configuration or subinterface configuration
Note
Command History
Configuring the cable source-verify command on the master interface of a bundle will
configure it for all of the slave interfaces in the bundle as well.
Release
Modification
11.3 XA
This command was introduced.
12.0(7)T
The dhcp keyword was added.
12.0(10)SC, 12.1(2)EC Support was added for these trains.
12.1(3a)EC
Subinterface support was added.
12.1(13)EC,
12.2(11)BC1
The leasetimer keyword was added.
12.2(15)BC1
The verification of CPE devices was changed when using the dhcp keyword.
12.2(15)BC2
Support for verifying CMs and CPE devices that are on a different subnet
than the cable interface was enhanced to use Reverse Path Forwarding
(RFP).
12.3(9a)BC
In order to protect the Cisco CMTS from denial of service attacks,
Cisco IOS Release 12.3(9a)BC adds the option of using a per SID basis for
deriving lease queries from CPE devices. This release also introduces a
global rate limit for lease queries initiated by downstream traffic. These
enhancements reduce the CPU utilization of DHCP Receive and ISR
processes when the Cisco CMTS is configured with the cable source-verify
dhcp and no cable arp commands.
For additional information about this and other commands, refer to the following document on
Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
cable submgmt default
To enable the Cisco CMTS Static CPE Override feature on the Cisco CMTS, use the cable submgmt
default command in global configuration mode. This command enables field technicians to add a
temporary CPE device behind the subscriber’s cable modem. The temporary CPE device shares the same
SID settings as the original CPE device, even though the temporary CPE device has a different MAC
address. The original CPE device automatically changes from dhcp cpe to static cpe in the CMTS host
routing tables, and the CPE device continues to receive service with the same SID. To disable
Cisco CMTS Static CPE Override on the Cisco CMTS, use the no form of this command. This
automatically updates the routing tables and enables the MAC address from the technician’s laptop for
a future field service connection at a different location.
cable submgmt default {active | filter-group {cm | cpe} | learnable | max-cpe}
no cable submgmt default
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Important Notes
Syntax Description
active
Keyword enables Cisco CMTS Static CPE Override, granting local CPE
control for subscriber management filtering (as defined by existing SID
settings).
filter-group {cm | cpe}
Keyword enables one ore more temporary CPE devices to inherit the
characteristics of an existing filter group, either on the downstream or the
upstream of the cable modem (cm) or the CPE device (cpe).
•
filter-group cm {downstream | upstream}—This keyword
combination enables one or more temporary CPE devices to inherit and
filter by the default downstream cable modem group, or by the default
upstream cable modem group.
•
filter-group cpe {downstream | upstream}—This keyword
combination enables one or more temporary CPE devices to inherit and
filter by the default downstream CPE group, or by the default upstream
CPE group.
learnable
Keyword automatically enables one or more temporary CPE devices to
learn and to operate within the CPE IP address(es) in the Cisco CMTS
routing table.
max-cpe
Keyword sets the maximum number of IP addresses to be permitted behind
a cable modem while the Cisco CMTS Static CPE Override feature is
enabled. This keyword enables multiple temporary CPE devices in the
range of 0 to 1024.
Defaults
This command is disabled by default.
Command Modes
Global configuration mode.
Command History
Release
Modification
12.3(9a)BC
This feature was introduced on Cisco uBR10012 and Cisco uBR7200 series
universal broadband routers.
Usage Guidelines
Prior to using this command, the first (existing) DHCP CPE device maintains its DHCP dynamic MAC
address behind the cable modem. The SID is assigned to this IP address.
However, by enabling Static CPE override, you gain the following states and options on two CPE devices
behind the cable modem.
•
The SID definition on the first CPE device is assigned a different static IP address. This enables you
to change the existing (dynamic) DHCP IP address to a static IP address without first clearing the
DHCP CPE host entries from the Cisco CMTS. The CPE IP state changes from dhcp to static cpe.
•
This static override allows a second CPE device with a second MAC address behind the same cable
modem with SID1 to be assigned same IP address as the first CPE device.
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Note
Examples
The second CPE device changes from dhcp cpe to static CPE in the CMTS host tables.
The following example enables Cisco CMTS Static CPE Override in the field, enabling more or more
additional CPE devices to be added behind a subscriber’s cable modem:
Router(config)# cable submgmt default active
The following example configures the Cisco CMTS to accept a temporary CPE device, which inherits
and filters by the subscriber’s default downstream cable modem group:
Router(config)# cable submgmt default filter-group cm downstream
The following example configures the Cisco CMTS to accept a temporary CPE device, and to update the
temporary CPE device with the current routing table from the Cisco CMTS:
Router(config)# cable submgmt default learnable
The following example configures the Cisco CMTS to accept a maximum of five temporary CPE devices
behind a subscriber’s cable modem:
Router(config)# cable submgmt default max-cpe 5
Related Commands
Command
Description
show cable host
Displays the CPE devices (hosts) residing behind a specified cable modem
(MAC address).
show cable tech-support
Cisco IOS Release 12.3(9a)BC introduces changes to the output of the show cable tech-support
command. This change allows users with large numbers of online cable modems to collect the necessary
information without consuming the console session for a long period of time.
To display general information about the router when reporting a problem, use the show cable
tech-support command in privileged EXEC mode.
show cable tech-support
Syntax Description
This command has no additional arguments or keywords.
Defaults
This command has no default behavior or values.
Command Modes
Privileged EXEC
Command History
Release
Modification
11.2
This command was introduced.
12.1(1a)T1
This command was modified to include information about the cable clock
card.
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Important Notes
Release
Modification
12.2(15)BC2
This command added several show pxf commands to the display on the
Cisco uBR10012 router.
12.3(9a)BC
The output of the command was significantly shortened by moving a
number of show commands (the ones that display information about
individual cable modems) to the show tech-support command. This release
also adds support for an option to display information about only one
specific cable interface.
The output of the command was significantly shortened by moving a
number of show commands (the ones that display information about
individual cable modems) to the show tech-support command. Also, added
support for an option to display information about only one specific cable
interface.
Examples
The following example illustrates the cable modem and interface information from a
Cisco uBR7246VXR router on which Cisco IOS Release 12.3(9a)BC is installed.
Router# show cable tech-support
For additional information about this and other commands, refer to the following document on
Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
show controllers cable
Cisco IOS Release 12.3(9a)BC removes the tech-support keyword from the show controllers cable
command. This change allows users with large numbers of online cable modems to collect the necessary
information without consuming the console session for a long period of time.
Additional and related improvements are also available for the show tech-support command.
To display information about the interface controllers for a cable interface on the Cisco CMTS router,
use the show controllers cable command in user EXEC or privileged EXEC mode.
show controllers cable {slot/port | slot/subslot/port} [downstream | upstream [port] | [mem-stat]
[memory] [proc-cpu] [tech-support]
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Important Notes
Syntax Description
slot/port
Identifies the cable interface and downstream port on the
Cisco uBR7100 series and Cisco uBR7200 series routers.
On the Cisco uBR7100 series router, the only valid value is 1/0. On the
Cisco uBR7200 series router, slot can range from 3 to 6, and port can
be 0 or 1, depending on the cable interface.
slot/port
Identifies the cable interface on the Cisco uBR7246VXR router.
The syntax for the Cisco uBR10012 router is slot/subslot/port, where
the following are the valid values:
•
slot = 5 to 8
•
subslot = 0 or 1
•
port = 0 to 4 (depending on the cable interface)
downstream
(Optional) Displays downstream interface status.
upstream
(Optional) Displays upstream interface status.
port
(Optional) Specifies the desired upstream port. Valid values start with
0 for the first upstream port on the cable interface line card.
mem-stat
(Optional) Displays the output from the show memory statistics
command to display a summary of memory statistics for a Broadband
Processing Engine (BPE) cable interface line card.
memory
(Optional) Displays the output from the show memory command to
display a summary of memory statistics, including the memory as it is
allocated per process, for a Broadband Processing Engine (BPE) cable
interface line card.
proc-cpu
(Optional) Displays the output from the show processes cpu command
to display the processor status for a Broadband Processing Engine
(BPE) cable interface line card.
tech-support
(Optional) Displays information from a number of different show
commands for technical support purposes. The exact output depends
on the platform, configuration, and type of protocols being used
Command Modes
User EXEC, Privileged EXEC
Command History
Release
Modification
11.3 NA
This command was introduced.
12.0(2)XC
This command was modified to show a number of additional fields.
12.1(5)EC1
Support was added for the Cisco uBR7100 series router, including
information about the Cisco uBR7100 series integrated upconverter.
12.2(1)XF1
Support was added for the Cisco uBR10012 router.
12.0(16)SC2,
12.1(10)EC1,
12.2(4)BC1b
The algorithm for calculating the SNR value was enhanced for a more
accurate value.
12.2(15)CX
Support was added for the Cisco uBR-MC28U/X cable interface line card,
including the display of the number of packets dropped because they were
for a Service Flow ID (SFID) of 0.
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Important Notes
Usage Guidelines
Note
Examples
Release
Modification
12.2(15)BC2b
The mem-stat, memory, and proc-cpu options were added to obtain
processor information from the onboard processor on Broadband Processing
Engine (BPE) cable interface line cards, such as the Cisco uBR-MC16U/X,
Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U cards.
12.3(9a)BC
Adds the tech-support option to improve information required during
technical support.
The mem-stat, memory, and proc-cpu keywords execute the related command on the processor that
runs on added to obtain the relevant information from the onboard processor on Broadband Processing
Engine (BPE) cable interface line cards, such as the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and
Cisco uBR-MC5X20S/U cards. This allows you to obtain information that is specific for that particular
cable interface card, as opposed to having to run these commands on the entire router.
The mem-stat, memory, and proc-cpu options are not available for cable interface line cards that do not
contain an onboard processor (for example, the Cisco uBR-MC16C card).
The following is sample output for the downstream connection for slot 3 on port 0 on Cisco CMTS router
from the show controllers cable downstream command:
CMTS01# show controllers cable 3/0 downstream
Cable 3/0 Downstream is up
Frequency not set, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 Msps
FEC ITU-T J.83 Annex A, R/S Interleave I=12, J=17
Table 10 describes the fields displayed by the show controllers cable downstream command.
Table 10
Examples
show controllers cable downstream Field Descriptions
Field
Description
Cable
Slot number/port number indicating the location of the Cisco cable
interface line card.
Downstream is up
Indicates that the RF downstream interface is enabled.
Frequency
Transmission frequency of the RF downstream. (This information
may not match the current transmission frequency, which is
external on CMTS platforms that use an external upconverter.)
Channel Width
Indicates the width of the RF downstream channel.
QAM
Indicates the modulation scheme.
Symbol Rate
Indicates the transmission rate (in number of symbols per second).
FEC ITU-T
Indicates the Motion Picture Experts Group (MPEG) framing
standard.
R/S Interleave I/J
Indicates Reed Solomon framing based on ITU S.83-B.
The following example illustrates the information from the show controllers cable command on a
Cisco uBR7246VXR router on which Cisco IOS Release 12.3(9a)BC is installed.
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Router# show controllers cable x/y
For additional information about this and other commands, refer to the following document on
Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
show tech-support
Cisco IOS Release 12.3(9a)BC shortens the output of the show tech-support command on the
Cisco uBR7246VXR routers. This change allows users with large numbers of online cable modems to
collect information without consuming the console session for a long period of time.
To display general information about the Cisco CMTS router when reporting a problem to Cisco
technical support, use the show tech-support command in privileged EXEC mode.
show tech-support [page] [password] [cef | ipc | ipmulticast | isis | mpls | ospf | rsvp]
Note
The show tech-support command automatically displays the output of a number of different show
commands. The exact output depends on the platform, configuration, and type of protocols being used.
Note
The show tech-support includes most of the information shown in the show cable tech-support
command.
Syntax Description
page
(Optional) Causes the output to display a page of information at a time. Use the
Return key to display the next line of output or use the space bar to display the next
page of information. If not used, the output scrolls (that is, does not stop for page
breaks).
password
(Optional) Leaves passwords and other security information in the output. If not used,
passwords and other security-sensitive information in the output are replaced with the
label “<removed>” (this is the default).
cef
(Optional) Displays information about the Cisco Express Forwarding (CEF) protocol
configuration and status.
ipc
(Optional) Displays information about interprocess communications on the Cisco
router.
ipmulticast
(Optional) Displays information about the IP multicast configuration and status.
isis
(Optional) Displays information about the Connectionless Network Service (CLNS)
and Intermediate System-to-Intermediate System (IS-IS) routing protocol
configuration and status.
Note
mpls
IS-IS support is provided only on CMTS platforms running Cisco IOS images
that have a “-p-” as part of the image name.
(Optional) Displays information about Multiprotocol Label Switching (MPLS) on the
Cisco router, which instructs the routers and the switches in the network on where to
forward the packets based on preestablished IP routing information.
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Caveats for Cisco IOS Release 12.3 BC
ospf
(Optional) Displays information about the Open Shortest Path First (OSPF) routing
algorithm and status on the Cisco router.
rsvp
(Optional) Displays information about the IP Resource Reservation Protocol (RSVP)
configuration and status.
For additional information about this and other commands, refer to the following document on
Cisco.com:
•
Cisco Broadband Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html.
Caveats for Cisco IOS Release 12.3 BC
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most
serious caveats; severity 2 caveats are less serious. Severity 3 caveats are moderate caveats, and only
selected severity 3 caveats are included in the caveats document.
Caveat numbers and brief descriptions for each Cisco IOS Release 12.3(17b)BCx-, 12.3(21a)BCx-, and
12.3(23)BCx-based releases are listed in this section.
This section is updated with corresponding headings for open and closed caveats for each release.
Cisco IOS Release 12.3M is the parent release train for Cisco IOS Release 12.3(21a)BC9. Unless
otherwise noted, Cisco IOS Release 12.3(21a)BC9 maintains support for the changes and caveat
resolutions introduced in earlier releases of Cisco IOS Release 12.3M.
Note
If you have an account on Cisco.com, you can use the Bug Toolkit to find select caveats of any severity.
To reach the Bug Toolkit, log in to Cisco.com and click Technical Support: Tools & Utilities: Software
BUG TOOLKIT (under Configuration Tools). Another option is
http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl
Open Caveats for Cisco IOS Release 12.3(23)BC10
There are no open caveats for Cisco IOS Release 12.3(23)BC10.
Resolved Caveats for Cisco IOS Release 12.3(23)BC10
Table 12 lists only severity 1 and 2 caveats and select severity 3 caveats for the
Cisco IOS Release 12.3(23)BC10.
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Table 11
Resolved Caveats for Cisco IOS Release 12.3(23)BC10
DDTS ID Number
Description
CSCsz45567
A device running Cisco IOS Software, Cisco IOS XE Software, or Cisco IOS XR
Software is vulnerable to a remote denial of service condition if it is configured
for Multiprotocol Label Switching (MPLS) and has support for Label Distribution
Protocol (LDP).
A crafted LDP UDP packet can cause an affected device running Cisco IOS
Software or Cisco IOS XE Software to reload. On devices running affected
versions of Cisco IOS XR Software, such packets can cause the device to restart
the mpls_ldp process.
A system is vulnerable if configured with either LDP or Tag Distribution Protocol
(TDP).
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at:
http://www.cisco.com/warp/public/707/cisco-sa-20100324-ldp.shtml
CSCsz75186
Cisco IOS Software is affected by a denial of service vulnerability that may allow
a remote unauthenticated attacker to cause an affected device to reload or hang.
The vulnerability may be triggered by a TCP segment containing crafted TCP
options that is received during the TCP session establishment phase. In addition
to specific, crafted TCP options, the device must have a special configuration to
be affected by this vulnerability.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at:
http://www.cisco.com/warp/public/707/cisco-sa-20100324-tcp.shtml
CSCtc44253
Symptoms: The accumulated timing offset of a modem goes to a negative value.
The following error message is displayed on the CMTS:
"%UBR10000-4-BADTXOFFSET: Bad timing offset -182443 detected for cable
modem 000a.73cc.c7b7. "
Conditions: This issue occurs on the Cisco uBR10-MC5X20 line card.
Workaround: There is no workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
103
Caveats for Cisco IOS Release 12.3 BC
Table 11
Resolved Caveats for Cisco IOS Release 12.3(23)BC10 (continued)
DDTS ID Number
Description
CSCti25339
Symptoms: Cisco IOS device may experience a device reload.
Conditions: This issue occurs when the Cisco IOS device is configured for SNMP
and receives certain SNMP packets from an authenticated user. Successful
exploitation causes the affected device to reload. This vulnerability could be
exploited repeatedly to cause an extended DoS condition.
Workaround: There is no workaround.
PSIRT Evaluation:
The Cisco PSIRT has assigned this bug the following CVSS version 2 score. The
Base and Temporal CVSS scores as of the time of evaluation are 6.8/5.6:
https://intellishield.cisco.com/security/alertmanager/cvssCalculator.do?dispatch
=1&version=2&vector=AV:N/AC:L/Au:S/C:N/I:N/A:C/E:F/RL:OF/RC:C
CVE ID CVE-2010-3050 has been assigned to document this issue.
Additional information on Cisco's security vulnerability policy can be found at the
following URL:
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.ht
ml
CSCti81896
Symptoms: When the ingress cancellation feature is enabled, all modems on an
upstream may momentarily go offline and then recover within minutes. This
problem is not observed when the ingress cancellation feature is disabled.
Conditions: This issue occurs because the Rogue modems may transmit during
ingress cancellation idle period. During this period, modems should not transmit.
One or more modems consistently transmitting at this time period can create poor
ingress cancellation performance for the burst receiver, and in the worst case
situation, it can cause all modems to go offline momentarily until the upstream
receiver re-adapts.
Workaround: Disable the ingress cancellation feature for that upstream, for which
the rogue modems failures are encountered.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
104
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(23)BC9
Table 12 lists only severity 1 and 2 caveats and select severity 3 caveats for the
Cisco IOS Release 12.3(23)BC9.
Table 12
Open Caveats for Cisco IOS Release 12.3(23)BC9
DDTS ID Number
Description
CSCta03480
Symptoms: A configuration synchronization issue is observed between the
Cisco uBR7200-NPE-G1 processor and a line card.
Workaround: Execute the cable dynamic-secret exclude oui command.
CSCeh33888
Symptoms: The Cisco uBR7246VXR router reloads with a last reset from the
watchdog reset.
Conditions: This issue occurs when the Cisco uBR7246VXR router has a
Cisco uBR7200-NPE-G1 processor board and runs other Cisco IOS BC releases.
Workaround: There is no workaround.
Resolved Caveats for Release 12.3(23)BC9
Table 13 lists only severity 1 and 2 caveats and select severity 3 caveats for the
Cisco IOS Release 12.3(23)BC9.
Table 13
Resolved Caveats for Cisco IOS Release 12.3(23)BC9
DDTS ID Number
Description
CSCsg67817
Symptoms: Malformed H.245 packets crash the IOS-based H.323 gateway.
Conditions: This issue occurs when the H.323 gateway is configured.
Workaround: There is no workaround.
CSCsw14622
Symptoms: For deleted service flows, the last character in the “Service Class
Name” field is dropped from the Subscriber Account Management Interface Specification (SAMIS) records and the “docsQosServiceFlowLogServiceClassName”
SNMP MIB object.
Workaround: There is no workaround.
CSCsw26713
Symptoms: The Cisco uBR7200 series universal broadband router experiences
cable line card memory leaks.
Workaround: There is no workaround.
CSCsx70889
Symptoms: Cisco devices running affected versions of Cisco IOS Software are
vulnerable to a denial of service (DoS) attack if configured for IP tunnels and
Cisco Express Forwarding.
Workaround: Cisco has released free software updates that address this vulnerability.
This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090923-tunnels.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
105
Caveats for Cisco IOS Release 12.3 BC
Table 13
Resolved Caveats for Cisco IOS Release 12.3(23)BC9 (continued)
DDTS ID Number
Description
CSCsz38104
Symptoms: The H.323 implementation in the Cisco IOS software contains a vulnerability that can be exploited remotely to cause a device running a
Cisco IOS software to reload.
Workaround: Cisco has released free software updates that address this vulnerability. You can disable H.323, if the device that is running the Cisco IOS Software
does not need it for VoIP services.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-h323.shtml
CSCsz44822
Symptoms: A Cisco uBR7200 series universal broadband router crashes indicating the following error:
*Apr 22 22:40:50.363: %SYS-2-CHUNKBADREFCOUNT: Bad chunk reference
count, chunk 92B3A70 data 92BB3C4 refcount FFFFFFFF alloc pc 69AFF4.
-Process= "CMTS SID mgmt task", ipl= 3, pid= 74
-Traceback= B5CB14 B5D334 CAB9F0 CABE1C 69BC50 73A850 762C38 641FF4
641C4C 641E80 646CE0 917318
chunk_diagnose, code = 3
chunk name is CMTSPCTYPE
Conditions: This issue occurs when the cable helper-address command is configured with the same IP address as the bundle IP address.
Workaround: There is no workaround.
CSCsz72547
Symptoms: The Cisco uBR7200 series universal broadband router reboots.
Conditions: This issue occurs on a Cisco uBR7246VXR router (with a
Cisco uBR7200-NPE-G1 processor) running Cisco IOS Release 12.3(21a)BC4
and later releases.
Workaround: There is no workaround.
CSCta39725
Symptoms: After the Cisco CMTS reload, samis-cable metering source-interface configuration is removed from the running configuration.
Conditions: This issue occurs on the Cisco uBR7200 series broadband router
running Cisco IOS Release 12.2(33)SCB.
Workaround: Reconfigure the samis-cable metering source-interface.
CSCtb23412
Symptoms: There are no known symptoms for this issue.
Conditions: This issue is very unlikely to occur. This issue occurs only if the
device is in the wrong chain beyond the second position.
Workaround: There is no workaround for this issue.
CSCtb28349
Symptoms: If a cable modem sends a Dynamic Channel Change response
(DCC-RSP) to confirm the Dynamic Channel Change request (DCC-REQ) indicating that the target channel is exactly the one that the modem gets online, and
the technique is larger than 0, the line card crashes when it processes this
DCC-RSP.
Conditions: This issue occurs only when the DPC3000 modem responds to the
DCC_RSP to confirm the DCC-REQ.
Workaround: Do not use the test command on the DPC3000 modem to trigger this
issue.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
106
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 13
Resolved Caveats for Cisco IOS Release 12.3(23)BC9 (continued)
DDTS ID Number
Description
CSCtb66848
Symptoms: After an upgrade to Cisco IOS Release 12.3(23)BC8,
Cisco uBR-MC28U line cards continue to crash.
Workaround: There is no workaround.
CSCtb82697
Symptoms: The CloseLogicalChannel (CLC) CPU revision is displayed in the
output of the show tech command.
Workaround: There is no workaround.
CSCtc17575
Symptoms: The command cable privacy hotlist cm <a.a.a> command does not
block CMs from coming online.
Conditions: This issue occurs when the modems do not have the appropriate certificates.
Workaround: There is no workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
107
Caveats for Cisco IOS Release 12.3 BC
Table 13
Resolved Caveats for Cisco IOS Release 12.3(23)BC9 (continued)
DDTS ID Number
Description
CSCtc45156
Symptoms: The cable modem (CM) is found stuck in the reject(c) state. If you run
the debug cable tlv and debug cable mac-address <cm-mac> verb commands,
the log displays the following:
......
SLOT 4: Oct 8 15:19:59.098
^D
......
SLOT 4: Oct 8 15:19:59.098
^D
......
SLOT 4: Oct 8 15:19:59.098
SLOT 4: Oct 8 15:19:59.098
SLOT 4: Oct 8 15:19:59.098
SLOT 4: Oct 8 15:19:59.098
0019.474e.e0b6 on interface
CoS/Sflow/Cfr/PHS failed in
CST:
Service Class Name : us_sc
CST:
Service Class Name : ds_sc
CST: Can't find service class name.
CST: Can't find service class name.
CST: MDF DISABLE for CM 0019.474e.e0b6
CST: Registration failed for Cable Modem
Cable4/0/U5:
REG-REQ
Conditions: This issue occurs when the CM configuration file includes the
service class name command for upstream (US) and downstream (DS) service
flows.
Workaround: There is no workaround.
CSCtc58147
Symptoms: The CM is found stuck in the reject(c) state. If you run the
debug cable tlv and debug cable mac-address <cm-mac> verb commands, the
log displays the following:
......
SLOT 4: Oct 15 13:16:23.379: Found Upstream Service Flow TLV
SLOT 4: Oct 15 13:16:23.379:
Service Flow Reference : 1
SLOT 4: Oct 15 13:16:23.379:
Service Class Name String Length 16,
Exceeds Limit of 15
SLOT 4: Oct 15 13:16:23.379: PARSER-ERROR: TLV 4 has bad length 16
SLOT 4: Oct 15 13:16:23.379: Primary CoS/Sflow encodings missing.
CoSs:0 Sflows[US, DS]: [1, 0]
SLOT 4: Oct 15 13:16:23.379: Registration failed for Cable Modem
001a.c3ff.d77e on interface Cable4/0/U1:
CoS/Sflow/Cfr/PHS failed in REG-REQ-MP
Conditions: This issue occurs when the CM configuration file includes the
service class name command with a value of 15 bytes for upstream (US) and
downstream (DS) service flows.
Workaround: Change the service class name string to less than 15 bytes.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
108
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(21a)BC9
Table 14 lists nly severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(21a)BC9
release.
Table 14
Open Caveats for Cisco IOS Release 12.3(21a)BC9
DDTS ID Number
Description
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets
and the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
Resolved Caveats for Release 12.3(21a)BC9
Table 15 lists nly severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(21a)BC9
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
109
Caveats for Cisco IOS Release 12.3 BC
Table 15
Resolved Caveats for Cisco IOS Release 12.3(21a)BC9
DDTS ID Number
Description
CSCse85652
Symptom: Access to the Cisco IOS HTTP server is denied if the enable password
is not configured.
Conditions: This issue is seen in the following conditions:
•
Enable password is not present in the device configuration
•
Cisco HTTP server or Cisco HTTPS server is enabled
•
No other authentication mechanism such as Remote Authentication Dial In
User Service (RADIUS), or Terminal Access Controller Access-Control
System (TACACS+)or is configured to access the Cisco HTTP or Cisco
HTTPS servers
Workaround: The following workaround can be used:
•
CSCsg00102
Enable the authentication to the Cisco HTTp server or Cisco HTTPS server
by configuring the enable password or enable secret commands to configure
the password. Use the following steps the configure the enable password
using the enable secret command:
1.
Replace “mypassword” with the new password.
2.
For information on the differences on configuring the enable secret and
enable passwords, refer to the Cisco IOS Password Encryption Facts at
http://www.cisco.com/en/US/tech/tk59/technologies_tech_note09186a0
0809d38a7.shtml
•
Enable authentication mechanisms such as RADIUS or TACACS+. For
information on configuration, refer to
http://www.cisco.com/en/US/tech/tk59/technologies_tech_note09186a00800
94e99.shtml
•
Disable the Cisco HTTP server or the Cisco HTTPS server using no ip http
server and no ip http secure-sever commands.
Symptoms: The SSLVPN service stops accepting any new SSLVPN connections.
Conditions: A device configured for SSLVPN may stop accepting any new
SSLVPN connections, due to a vulnerability in the processing of new TCP
connections for SSLVPN services. If “debug ip tcp transactions” is enabled and
this vulnerability is triggered, debug messages with connection queue limit
reached will be observed.
Workaround: Clear TCP connections using the clear tcp tcb command.
CSCsh97579
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
110
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 15
Resolved Caveats for Cisco IOS Release 12.3(21a)BC9
DDTS ID Number
Description
CSCsi13344
Symptom: Three separate Cisco IOS Hypertext Transfer Protocol (HTTP)
cross-site scripting (XSS) vulnerabilities and a cross-site request forgery (CSRF
vulnerability have been reported to Cisco by three independent researchers.
The Cisco Security Response is posted at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-2
0090114-http
Conditions: See “Additional Information” section in the posted response for
further details.
Workarounds: See “Workaround” section in the posted response for further
details.
CSCsj10593
Symptom: A terminating gateway (TGW) that is configured for Cisco ISDN
Interconnect for Voice Gateways Solution may crash.
Conditions: This occurs when the ISDN test call interface Serial1:23 22222 is
issued at the Call Starter. This happens with Switch Types: OGW: primary-ni
TGW: primary-dms100.
Workaround: There is no workaround.
CSCsk64158
Symptoms: Several features within Cisco IOS software are affected by a crafted
UDP packet vulnerability. If any of the affected features are enabled, a successful
attack will result in a blocked input queue on the inbound interface. Only crafted
UDP packets destined for the device could result in the interface being blocked,
transit traffic will not block the interface.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available in the workarounds
section of the advisory. This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml.
CSCsm27071
A vulnerability in the handling of IP sockets can cause devices to be vulnerable to
a denial of service attack when any of several features of Cisco IOS software are
enabled. A sequence of specially crafted TCP/IP packets could cause any of the
following results:
•
The configured feature may stop accepting new connections or sessions.
•
The memory of the device may be consumed.
•
The device may experience prolonged high CPU utilization.
•
The device may reload. Cisco has released free software updates that address
this vulnerability.
Workarounds that mitigate this vulnerability are available in the “workarounds”
section of the advisory. The advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
111
Caveats for Cisco IOS Release 12.3 BC
Table 15
Resolved Caveats for Cisco IOS Release 12.3(21a)BC9
DDTS ID Number
Description
CSCso04657
Symptoms: SSLVPN service stops accepting any new SSLVPN connections.
Conditions: A device configured for SSLVPN may stop accepting any new
SSLVPN connections, due to a vulnerability in the processing of new TCP
connections for SSLVPN services. If “debug ip tcp transactions” is enabled and
this vulnerability is triggered, debug messages with connection queue limit
reached will be observed.
Workaround: There is no workaround.
CSCso90058
Symptoms: The Multilayer Switch Feature Card (MSFC) crashes with RedZone
memory corruption.
Conditions: This occurs while processing an Auto-RP packet with Network
Address Translation (NAT) enabled.
Workaround: There is no workaround.
CSCsq31776
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding. Cisco has released free software updates that address this
vulnerability. This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsr72301
Symptom: Three separate Cisco IOS Hypertext Transfer Protocol (HTTP)
cross-site scripting (XSS) vulnerabilities and a cross-site request forgery (CSRF)
vulnerability have been reported to Cisco by three independent researchers.
The Cisco Security Response is posted at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-2
0090114-http
CSCsv30595
Symptoms: The OSPF process may crash.
Conditions: The OSPF crash may be seen when the router receives invalid OSPF
messages.
Workaround: There is no workaround.
CSCsv34656
Symptom: A particular malformed OSPF message may cause the device to crash
or operate unpredictably. The possible effects of this are:
•
The router may crash.
•
Routing loops may form in the network.
•
OSPF may controls the CPU and drop adjacencies.
•
The show ip ospf database net command output displays unwanted lines.
Conditions: This is seen when the OSPF receives a malformed OSPF message.
Workaround: None. Using OSPF authentication may help mitigate this issue.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
112
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 15
Resolved Caveats for Cisco IOS Release 12.3(21a)BC9
DDTS ID Number
CSCsv04836
Description
Multiple Cisco products are affected by denial of service (DoS)
vulnerabilities that manipulate the state of Transmission Control Protocol
(TCP) connections. By manipulating the state of a TCP connection, an
attacker could force the TCP connection to remain in a long-lived state,
possibly indefinitely. If enough TCP connections are forced into a long-lived
or indefinite state, resources on a system under attack may be consumed,
preventing new TCP connections from being accepted. In some cases, a
system reboot may be necessary to recover normal system operation. To
exploit these vulnerabilities, an attacker must be able to complete a TCP
three-way handshake with a vulnerable system.
In addition to these vulnerabilities, Cisco Nexus 5000 devices contain a TCP
DoS vulnerability that may result in a system crash. This additional
vulnerability was found as a result of testing the TCP state manipulation
vulnerabilities.
Cisco has released free software updates for download from the Cisco website
that address these vulnerabilities. Workarounds that mitigate these
vulnerabilities are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20090908-tcp24.shtml.
CSCsv73509
Symptom: Terminal Access Controller Access-Control System (TACACS) or
XTACACS is broken.
Conditions: This occurs when no aaa new-model command is configured and the
authentication happens through the local when TACACS is configured. This
happens for the exec users under vty configuration.
Workaround: There is no workaround.
CSCsw24700
Cisco IOS software contains two vulnerabilities within the Cisco IOS WebVPN or
Cisco IOS SSLVPN feature (SSLVPN) that can be remotely exploited without
authentication to cause a denial of service condition. Both vulnerabilities affect
both Cisco IOS WebVPN and Cisco IOS SSLVPN features:
Crafted HTTPS packet will crash device - Cisco Bug ID CSCsk62253.
SSLVPN sessions cause a memory leak in the device - Cisco Bug ID
CSCsw24700.
Cisco has released free software updates that address these vulnerabilities. There
are no workarounds that mitigate these vulnerabilities. This advisory is posted at
the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml
CSCsx70889
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
113
Caveats for Cisco IOS Release 12.3 BC
Table 15
Resolved Caveats for Cisco IOS Release 12.3(21a)BC9
DDTS ID Number
Description
CSCsy15227
Cisco IOS Software configured with Authentication Proxy for HTTP(S), Web
Authentication or the consent feature, contains a vulnerability that may allow an
unauthenticated session to bypass the authentication proxy server or bypass the
consent webpage.
There are no workarounds that mitigate this vulnerability.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090923-auth-proxy.shtml
CSCsy56311
Symptom: The CPE fails to acquire an IP address using Dynamic Host
Configuration Protocol (DHCP).
Conditions: This issue is seen when the CPE host is first connected to a wrong CM
and fails to acquire an DHCP address. If the CPE is connected later to the correct
CM, the CPE still does not acquire the IP address.
Workaround: Execute clear cable host command on the MAC address of the CPE.
Open Caveats for Release 12.3(23)BC8
Table 16 lists nly severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC8
release.
Table 16
Open Caveats for Cisco IOS Release 12.3(23)BC8
DDTS ID Number
Description
CSCeh33888
Symptom: A Cisco uBR7246VXR router may reload with Last reset from the
watchdog reset.
Condition: This issue may occur when the router has a UBR7200-NPE-G1
processor board and may run other BC releases.
Workaround: There is no workaround.
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets
and the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
CSCsv16701
Symptom: Power supply information is not displayed when running the show
inventory command on the CiscouBR7200VXR series rotuers.
Conditions: This issue is observed in a Cisco uBR7200VXR series routers.
Workaround: Use show environment all command to view the power supply
information.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
114
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 16
Open Caveats for Cisco IOS Release 12.3(23)BC8
DDTS ID Number
Description
CSCsv58913
Symptom: Address resolution fails for downstream packet when running cable
source-verify dhcp command.
Condition: This issue occurs when a Cisco uBR Series router configured to verify
a CPE device’s IP address to MAC address resolution, through the use of DHCP
LEASEQUERY messages instead of using ARP.
Workaround: Temporarily allow downstream ARP resolution using cable bundle
interface commands cable arp and cable proxy-arp.
CSCsw14622
Symptom: For deleted service flows the last character in the Service Class Name
field is dropped in SAMIS records as well as in the SNMP MIB
docsQosServiceFlowLogServiceClassName.
Workaround: There is no workaround.
CSCsw49188
Symptom: Cable metering fails and enters a ‘hung’ state.
Condition: This issue is observed when the ip tcp timestamp command is
configured globally.
Workaround: Do not use the ip tcp timestamp command.
CSCsz72547
Symptom: The Cisco uBR7200 router reboots.
Conditions: This issue occurs in a Cisco uBR7246VXR (UBR7200-NPE-G1)
router running Cisco IOS Release 12.3(21a)BC4 and later.
Workaround: There is no workaround.
CSCsz74979
Symptom: The Cisco uBR router may crash due to a bus error and reload on
changing the Subscriber Traffic Management (STM) configuration.
Conditions: The issue has been reported on a Cisco uBR7246VXR
(UBR7200-NPE-G1) router running Cisco IOS Release12.3(23)BC2.
Workaround: There is no workaround.
CSCta03480
Symptom: The modem is stuck in reject(m) state after removal of cable
dynamic-secret exclude oui command
Conditions: There is no condition.
Workaround: Execute the command twice.
Resolved Caveats for Release 12.3(23)BC8
Table 17 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC8
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
115
Caveats for Cisco IOS Release 12.3 BC
Table 17
Resolved Caveats for Cisco IOS Release 12.3(23)BC8
DDTS ID Number
Description
CSCsh97579
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsq31776
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding. Cisco has released free software updates that address this
vulnerability. This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsx43002
Symptom: The output of show tech-support command contains snmp community
string passwords.
Conditions: This issue occurs in the output of the show tech-support command.
Workaround: These passwords must be removed. Replace the show tech-support
snmp community string show cable modem remote-query 30 mypassword with
show cable modem remote-query 30.
CSCsx69395
Symptom: The Cisco uBR7246VXR router may keep crashing after an upgrade
from Cisco IOS Release 12.2(15)BC to Cisco IOS Release 12.3(23)BC.
Conditions: This issue is seen after an upgrade.
Workaround:
CSCsy15227
1.
Remove ip ftp username/password configuration lines.
2.
Upgrade to an intermediate Cisco IOS version, say Cisco IOS Release
12.3(21)BC6 and then upgrade to Cisco IOS Release12.3(23)BC.
Cisco IOS Software configured with Authentication Proxy for HTTP(S), Web
Authentication or the consent feature, contains a vulnerability that may allow an
unauthenticated session to bypass the authentication proxy server or bypass the
consent webpage.
There are no workarounds that mitigate this vulnerability.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090923-auth-proxy.shtml
CSCsy28426
Symptom: When a wideband interface has w-online modems on it and the primary
channel is shut down, an error is seen in the modems counter in load-balancing,
and the modems go offline. This issue has an affect on the load balancing.
Conditions: The issue is seen when a wideband interface with w-online modems
and a primary channel is shut down.
Workaround: Configure the modem's primary channel such that it is not part of
channels in wideband interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
116
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 17
Resolved Caveats for Cisco IOS Release 12.3(23)BC8
DDTS ID Number
Description
CSCsh97579
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsq31776
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding. Cisco has released free software updates that address this
vulnerability. This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsy56311
Symptom: The CPE fails to acquire the IP address using DHCP.
Conditions: This issue occurs if the CPE host is first connected to a wrong CM
and it fails to get a DHCP address as the CPE is behind the wrong CM. The CPE
fails to get an IP address after it is connected to the correct CM.
Workaround: Run clear cable host command on the MAC address of the CPE.
CSCsy73726
Symptoms: The cable metering options “flow-aggregate” and “cpe-list-suppress”
get lost from the cable metering configuration if cable metering data-per-session
x timer y is present.
Condition: This is seen in the cable metering command.
Workaround: Reconfigure the metering options “flow-aggregate” and
“cpe-list-suppress” in the command.
CSCsy79541
Symptom: The Cisco uBR7200 router freeze when enabling the cable monitor
command.
Conditions: This is seen when cable monitor command is configured for an
unknown MAC address.
Workaround: Use cable intercept command.
CSCsy85008
Symptom: A “ifInOcters item” after a normal roll-over closely follows a abnormal
roll-over.
2009-03-24
2009-03-24
roll-over
2009-03-24
2009-03-24
2009-03-24
roll-over
2009-03-24
15:15:39 - 4076758789
15:20:39 - 524459145
15:25:46 - 726658247
15:31:08 - 939124784
15:35:39 - 583325062
<========== a normal
<===========an abnormal
15:41:11 - 801102043
Condition: This is seen when there is a roll-over between the first and second polls
on this list. This is a normal roll-over for a 32-bit counter. However, there is
another roll-over between the fourth and fifth polls.
Workaround: There is no workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
117
Caveats for Cisco IOS Release 12.3 BC
Table 17
Resolved Caveats for Cisco IOS Release 12.3(23)BC8
DDTS ID Number
Description
CSCsh97579
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsq31776
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding. Cisco has released free software updates that address this
vulnerability. This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsz05250
Symptom: When setting a CA certificate to ‘untrusted’, any CM that uses an issuer
of the same name is rejected, including the legitimate modems.
Conditions: The issue is found because of a newly created software “Haxorware”
which generates these CA certificates that conflict with the existing CA
certificates.
Workaround: The recommended method is always to not allow self-signed
certificates on the CMTS and explicitly set specific self-signed certificates to
trusted. This is the ‘opt-in’ model, rather than the ‘opt-out’ model.
CSCsz21661
Symptoms: The Gigabit Ethernet output for a 24 downstream wideband and
narrowband SPA can get isolated from the port after repeated online insertion and
removal (OIR) of the SPA within a short duration of time.
Conditions: This issue is seen with repeated OIR of the SPA within a short
duration of time and with repeated line protocol off and on within a short duration
of time.
Workaround: Reload the SPA using the hw-module bay reload command.
CSCsz22819
Symptoms: When using a wideband SIP, the total count for the SPA in slot 1/1/0
is a sum of both SPAs, rather than the sum of itself. This can be found using the
show hw-module bay all counters rf-channel command.
Conditions: This issue is seen in a wideband SIP when more than one SPA is
inserted in one SIP.
Workaround: There is no workaround.
CSCsz25465
Symptom: On an OIR or hw-module reset, some of the cable modems stuck at
reject(pk) or w-reject(pk) permanently.
Conditions: This is seen when BPI is enabled.
Workaround: Power cycle the cable modem to bring the cable modem to online(pt)
or w-online(pt) state.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
118
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 17
Resolved Caveats for Cisco IOS Release 12.3(23)BC8
DDTS ID Number
Description
CSCsh97579
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsq31776
Cisco devices running affected versions of Cisco IOS Software are vulnerable to
a denial of service (DoS) attack if configured for IP tunnels and Cisco Express
Forwarding. Cisco has released free software updates that address this
vulnerability. This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
090923-tunnels.
CSCsz52508
Symptom: The test cable dcc frequencycommand to move one modem to target
frequency does not work when the upstream channel id of the modem does not
belong to the target downstream channel.
Conditions: This issue is seen in test cable dcc frequency command.
Workaround: Use the test cable dcc frequency command when the upstream
channel id belongs to the target downstream channel.
CSCsz52617
Symptom: The cdxIfUpChannelAvgUtil reports incorrect numbers when rate
adapt is enabled on router
Conditions: This is seen when using SNMP to poll cdxIfUpChannelAvgUtil with
rate adapt enabled.
Workaround:
1) Use CLI to obtain numbers
2) Disable rate-adapt
CSCsz60620
Symptom: The cable line card silently reloads.
Conditions: The issue is seen when there is an endless loop in ISR.
Workaround: There is no workaround.
CSCta16416
Symptom: The Cisco uBR- MC28U cable line card crashes with data bus error
exception.
Conditions: This issue is seen in Cisco uBR-MC28U line cards running with
Cisco IOS Release 12.3(23)BC8.
Workaround: There is no workaround.
Open Caveats for Release 12.2(23)BC7
Table 18 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC7
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
119
Caveats for Cisco IOS Release 12.3 BC
Table 18
Open Caveats for Cisco IOS Release 12.3(23)BC7
DDTS ID Number
Description
CSCeh33888
Symptom: A Cisco uBR7246VXR router may reload with Last reset from the
watchdog reset.
Condition: This issue may occur when the router has a UBR7200-NPE-G1
processor board and may run other BC releases.
Workaround: There is no workaround.
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets
and the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
CSCsv16701
Symptom: Power supply information is not displayed when running the show
inventory command on the CiscouBR7200VXR series rotuers.
Conditions: This issue is observed in a Cisco uBR7200VXR series routers.
Workaround: Use show environment all command to view the power supply
information.
CSCsv58913
Symptom: Address resolution fails for downstream packet when running cable
source-verify dhcp command.
Condition: This issue occurs when a Cisco uBR Series router configured to verify
a CPE device’s IP address to MAC address resolution, through the use of DHCP
LEASEQUERY messages instead of using ARP.
Workaround: Temporarily allow downstream ARP resolution using cable bundle
interface commands cable arp and cable proxy-arp.
CSCsv82736
Symptom: The cable modem (CM) is unable to come online on the upstream port.
The modem reach init(r1) and init(r2) but fails to initilaize further. Most of the
polls to the CM fail on that upstream port.
Conditions: This issue first appeared at customer site in Cisco IOS Release
12.3(21a)BC6. It is a very rare conditon
Workaround: Use Shut/no shut command to fix the issue.
CSCsw14622
Symptom: For deleted service flows the last character in the Service Class Name
field is dropped in SAMIS records as well as in the SNMP MIB
docsQosServiceFlowLogServiceClassName.
Workaround: There is no workaround.
CSCsw49188
Symptom: Cable metering fails and enters a ‘hung’ state.
Condition: This issue is observed when the ip tcp timestamp command is
configured globally.
Workaround: Do not use the ip tcp timestamp command.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
120
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.2(23)BC7
Table 19 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC7
release.
Table 19
Resolved Cavests for Cisco IOS Release 12.2(23)BC7
DDTS ID Number
Description
CSCei05676
Symptom: The interface goes down and back up again which results in an
interruption of traffic for up to 5 seconds.
Condition: This issue occus when Cisco Discovery Protocol (CDP) is enabled or
disabled on a 1-port Gigabit Ethernet half-height (ESR-HH-1GE) interface.
Workaround: There is no workaround.
CSCsj10593
Symptom: A Terminating Gateway (TGW) configured for Cisco ISDN
Interconnect for Voice Gateways Solution may crash.
Conditions: This issue occurs in routers running Cisco IOS Release 12.4(15.6) and
functions as a TGW with all PRI switch types from the user to the network side.
This occurs when isdn test call interface command, serial1:23 22222 is issued at
at the start of the call. It occurs in switch types such as Originating Gateway
(OGW) configured as the primary-ni and TGWconfigured as the primary-dms100.
Workaround: There is no workaround.
CSCsk50429
Symptom: The Cisco uBR Series router crashes by an illegal access to a low
address.
Conditions: The issue occurs in routers is running Cisco IOS Release 12.3BC and
has Ospf configured.
Workaround: There is no known workaround.
CSCsm55365
Symptom: When configuring a new interface, either cable or Gigabit Ethernet, on
a uBR10000 router with a PRE2 running Cisco IOS Release
ubr10k2-k8p6u2-mz.123-17b.BC3, some of the secondary addresses fail to install
in the RIP database, and as a result are not advertised by RIP.
Condition: This issue is seen on a uBR10000 router with a PRE2 running Cisco
IOS Release ubr10k2-k8p6u2-mz.123-17b.BC3 and has configured secondary IP
addresses and advertised major network under RIP v2.
Workaround: Remove and reconfigure secondary IP addresses under the interface,
and flap the interface.
CSCso90058
Symptom: Multilayer Switch Feature Card (MSFC) crashes with RedZone
memory corruption.
Conditions: This problem is seen when processing an auto-RP packet and
Network Address Translation (NAT) is enabled.
Workaround: There is no known workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
121
Caveats for Cisco IOS Release 12.3 BC
Table 19
Resolved Cavests for Cisco IOS Release 12.2(23)BC7 (continued)
DDTS ID Number
Description
CSCsr72301
Symptom: Three separate Cisco IOS Hypertext Transfer Protocol (HTTP)
cross-site scripting (XSS) vulnerabilities and a cross-site request forgery (CSRF)
vulnerability have been reported to Cisco by three independent researchers.
Condition: The Cisco Security Response is posted at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-2
0090114-http
See “Additional Information” section in the posted response for further details.
Workaround: See “Workaround” section in the posted response for further details.
CSCsv73509
Symptom: User authentication is possible through a local server, although
Terminal Access Controller Access Control System (TACACS) is configured.
Conditions: This issue occurs for the exec users under vty configuration.
Workaround: There is no workaround.
CSCsw52539
Symptom: Cable metering collection enters ‘write-error’ state and doesn't recover.
Condition: Cable metering configured with default TCP parameters.
Workaround: Run the ip tcp path-mtu-discovery command to help prevent
occurances of the issue. Run the test cable metering abort command to clear the
"hung" state and to allow the next iteration of cable metering to occur.
CSCsw79768
Symptom: SNMP GetNext requests for docsQosServiceFlowPrimary (also known
as 1.3.6.1.2.1.10.127.7.1.3.1.8 or docsQosServiceFlowEntry.8) are rejected. Still,
if a certain docsQosServiceFlowPrimary entry is polled with SNMP Get directly
(after some additional calculations are performed to determine the index value),
the value is returned as expected.
Conditions: This issue first occured in Cisco uBR7114E running Cisco IOS
Release 12.3(21a)BC3.
Workaround: Poll the individual values following the steps of the procedure
suggested in SR 610144513.
CSCsx35612
Symptom: Cable metering is stuck in “in progress” state and no collection data is
transmitted despite show cable meter verbose command displays the current
export status as “in Progress” and the show tcp tcb xxxxx command displays the
TCP session is “ESTAB”.
Conditions: This issue first occured in Cisco uBR10000 roouter with ESR-PRE2
module running Cisco IOS Release 12.3(23)BC2 and cable metering enabled.
Workaround: Issue a test cable meter abort to clear the problem and force the
cable meter process to restart.
CSCsx51619
Symptom : The MAC destination address based classifier acts like a default
catch-all classifier on Cisco uBR7200 routers. That is, when this classifier is
checked (after the ones with higher rule priority) it matches all the packets.
Condition: This problem exists since Cisco IOS Release 12.3(23)BC6 release on
Cisco uBR7225 and Cisco uBR7100 platforms.
Workaround: There is no workaround except avoiding using the MAC classifier
on the Cisco UBR720 router.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
122
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 19
Resolved Cavests for Cisco IOS Release 12.2(23)BC7 (continued)
DDTS ID Number
Description
CSCsx64397
Symptom: L1 ISIS router does not install default route to a L1L2 router into its
routing table.
Conditions: This issue first occured in Cisco IOS Release 12.3BC and in some
later Cisco IOS 12.3 releases.
Workaround: Use clear ip route or clear isis commands.
CSCsx77978
Symptom: The downstream load is not balanced when downstream load balancing
group is configured with us-across-ds policy.
Conditions: This issue occurs when us-groups-across-ds policy is configured on
downstream load balancing group.
Workaround: Do not configure us-groups-across-ds policy on the downstream
load balancing group.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
123
Caveats for Cisco IOS Release 12.3 BC
Table 19
Resolved Cavests for Cisco IOS Release 12.2(23)BC7 (continued)
DDTS ID Number
Description
CSCsx79863
Symptom: The calculated channel utilization percents can become inaccurate.
The short term utilization seen via the output of the command show interface
cable X/Y/Z mac-scheduler, labelled “Avg upstream channel utilization” may
show a value that is much larger than the actual channel usage. The longer term
utilization used by the load-balancing module may also be much larger than the
actual channel usage.
Conditions: When ‘rate-adapt’ is configured for a particular upstream channel,
under certain configurable conditions the MAC schedular for that upstream will
allocate additional data grants to one or more cable modems in a given MAP
message. When the data grants go unused by the cable modem(s), the utilization
calculations made by the scheduler become skewed.
Workaround: There is no workaround for determining the correct utilizations.
The solution to the inaccuraccy of the upstream utilization calculations based
upon calculating grants when rate-adapt is configured is to instead calcalute the
data bytes received when rate-adapt is configured for a given upstream channel.
The number of bytes received is divided by the number of bytes that could have
been received (upstream channel capacity) in order to deterine the percentage of
utilization.
Note
Note that this new calculation will vary from the old calculation under
certain conditions:
1.
In the presence of upstream errors, the data bytes received will undermeasure
the US utilization as compared to the previous calculation.
2.
When an upstream is configured for mixed-mode (tdma-atdma), depending
upon the mode in which a particular CM is capable of transmitting, the byte
based calculation can undermeasure the US utilization as compared to the
previous calculation.
This is due to the fact that the new calculation uses the faster of the two channel
rates. Thus when only CMs capable of transmitting at the lower rates do so for an
extended period of time, the CMs will not appear to utilize the upstream channel
as fully as the previous calculation shown. While the above two issues will cause
the byte-based US utilization percent to vary from the previous data grant based
calculation, the variation is not expected to be significant under normal
conditions.
CSCsy13636
Symptom: A silent reload occurred on the Cisco uBR-MC28X line card and no
crash information was written on the boot flash.
Condition: This issue occurred on the Cisco uBR-MC28X line card.
Workaround: Unconfigure load balancing on the affected line card.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
124
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(23)BC6
Table 20 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC6
release.
Table 20
Open Caveats for Cisco IOS Release 12.3(23)BC6
DDTS ID Number
Description
CSCsv94276
Symptom: The Traffic Priority DOCSIS QoS parameter is not effective on the
Cisco uBR7200 series router.
Condition: This parameter does not seem to take effect on a Cisco uBR7200 series
router with Cisco uBR-MC28U or Cisco uBR-MC28C line cards.
Workaround: There is no workaround.
CSCsw35379
Symptom: Periodic 1-second delays between the CMTS transmission of SAMIS
packets; enough of these are occurring to make a significant impact on overall
SAMIS transfer time.
Workaround: There is no workaround.
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets
and the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
CSCsw49188
Symptom: Cable metering fails and enters a ‘hung’ state.
Condition: This issue is observed when the ip tcp timestamp command is
configured globally.
Workaround: Do not use the ip tcp timestamp command.
CSCsw52539
Symptom: Cable metering collection enters ‘write-error’ state and doesn't recover.
Condition: Cable metering configured with default TCP parameters.
Workaround: Run the ip tcp path-mtu-discovery command to help prevent
occurances of the issue. Run the test cable metering abort command to clear the
"hung" state and to allow the next iteration of cable metering to occur.
CSCsv16701
Symptom: Power supply information is not displayed when running the show
inventory command on the CiscouBR7200VXR series rotuers.
Conditions: This issue is observed in a Cisco uBR7200VXR series routers.
Workaround: Use show environment all command to view the power supply
information.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
125
Caveats for Cisco IOS Release 12.3 BC
Table 20
Open Caveats for Cisco IOS Release 12.3(23)BC6
DDTS ID Number
Description
CSCsl50455
Symptom: A customer premises equipment (CPE) is deleted from the cable
modem termination systems (CMTS) database, and the network connectivity is
lost.
Condition: This happens in an MPLS-VPN setup, where cable modem (CM) and
CPE are in different virtual private network (VPN) routing/forwarding instances
(VRF) and source verification with lease query is enabled.
If a legitimate CPE is removed from the CMTS database, and an upstream packet
is initiated from CPE, a lease query is generated by the CMTS and sent to the
dynamic host configuration protocol (DHCP) server. The lease query response is
received from the DHCP server but, the CMTS fails to add the CPE into the
database. As a result, the CPE loses its network connectivity.
Workaround: The CPE has to go through the DHCP cycle again. The CPE is added
to the CMTS database and network connectivity at the CPE is restored.
CSCeh33888
Symptom: A Cisco uBR7246VXR router may reload with Last reset from the
watchdog reset.
Condition: This issue may occur when the router has a UBR7200-NPE-G1
processor board and may run other BC releases.
Workaround: There is no workaround.
CSCsw14622
Symptom: For deleted service flows the last character in the Service Class Name
field is dropped in SAMIS records as well as in the SNMP MIB
docsQosServiceFlowLogServiceClassName.
Workaround: There is no workaround.
Resolved Caveats for Release 12.3(23)BC6
Table 21 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC6
release.
Table 21
Resolved Caveats for Cisco IOS Release 12.3(23)BC6
DDTS ID Number
Description
CSCsu44606
Symptom: Duplicate traps are generated when configuring SNMP traps for cable
billing operations.
Workaround: There is no workaround.
CSCsu84946
Symptom: Cisco uBR7200 series router crashes due to Block Overrun (Red Zone
Corrupted).
Workaround: There is no workaround.
CSCsv11927
Symptom: The Cisco uBR7200 series router may hang when using the cable
monitor command and inserting an unknown MAC address (the address not
available in the CMTS database) as an argument.
Workaround: Use the correct MAC address.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
126
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 21
Resolved Caveats for Cisco IOS Release 12.3(23)BC6
DDTS ID Number
Description
CSCsv18798
Symptom: Changing the frequency stacking configuration causes the upstream
minislot sizes to differ from running configuration.
Condition: When enabling or disabling the frequency stacking configuration, the
upstream minislot sizes revert to system defaults based on the upstream DOCSIS
mode.
Workaround: Reload the line card or chassis.
CSCsv04836
Multiple Cisco products are affected by denial of service (DoS)
vulnerabilities that manipulate the state of Transmission Control Protocol
(TCP) connections. By manipulating the state of a TCP connection, an
attacker could force the TCP connection to remain in a long-lived state,
possibly indefinitely. If enough TCP connections are forced into a long-lived
or indefinite state, resources on a system under attack may be consumed,
preventing new TCP connections from being accepted. In some cases, a
system reboot may be necessary to recover normal system operation. To
exploit these vulnerabilities, an attacker must be able to complete a TCP
three-way handshake with a vulnerable system.
In addition to these vulnerabilities, Cisco Nexus 5000 devices contain a TCP
DoS vulnerability that may result in a system crash. This additional
vulnerability was found as a result of testing the TCP state manipulation
vulnerabilities.
Cisco has released free software updates for download from the Cisco website
that address these vulnerabilities. Workarounds that mitigate these
vulnerabilities are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20090908-tcp24.shtml.
CSCsm27071
Symptom: Memory reduces over time with certain socket applications such as
skinny socket server.
Conditions: An increasing memory hold is seen in the Skinny socket server
process after repeated rejected ephone registrations.
Workaround: There is no workaround.
CSCsr74835
Symptom:There may be an overflow of destination buffer due to unspecified
bounding length.
Workaround: There is no workaround.
Open Caveats for Release 12.3(23)BC5
Table 22 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC5
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
127
Caveats for Cisco IOS Release 12.3 BC
Table 22
Open Caveats for Cisco IOS Release 12.3(23)BC5
DDTS ID Number
Description
CSCsu44606
Symptom: Duplicate traps are generated when configuring SNMP traps for Cable
billing operations.
Workaround: There is no workaround.
CSCsu84946
Symptom: Cisco uBR7200 series router crashes due to Block Overrun (Red Zone
Corrupted).
Workaround: There is no workaround.
CSCsk86687
Symptom: The ARP filter functionality does not work and the IP ARP request
counters do not increment.
Workaround: There is no workaround.
CSCsl50455
Symptom: A customer premises equipment (CPE) is deleted from the cable
modem termination systems (CMTS) database, and the network connectivity is
lost.
Condition: This happens in an MPLS-VPN setup, where cable modem (CM) and
CPE are in different virtual private network (VPN) routing/forwarding instances
(VRF) and source verification with lease query is enabled.
If a legitimate CPE is removed from the CMTS database, and an upstream packet
is initiated from CPE, a lease query is generated by the CMTS and sent to the
dynamic host configuration protocol (DHCP) server. The lease query response is
received from the DHCP server but, the CMTS fails to add the CPE into the
database. As a result, the CPE loses its network connectivity.
Workaround: The CPE has to go through the DHCP cycle again. The CPE is added
to the CMTS database and network connectivity at the CPE is restored.
CSCsu74681
Symptom: The show cable load-balance command displays details of the
wideband cable interfaces (upstream and downstream) twice in the command
output.
Condition: This issue is observed in a wideband cable setup with 3.0 DOCSIS
cable modems and non-DOCSIS 3.0 cable modems.
Workaround: You can keep track of the aggregate statistics for the interface
manually.
CSCsu65409
Symptom: Cable modems are penalized at random for a few seconds into the
maintenance window, much before they exceed the traffic limits.
Condition: This occurs in CMTS environments using Subscriber Traffic
Management (STM).
Workaround: There is no workaround.
Resolved Caveats for Release 12.3(23)BC5
Table 23 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC5
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
128
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 23
Resolved Caveats for Cisco IOS Release 12.3(23)BC5
DDTS ID Number
Description
CSCsr91209
Symptom: The value of SNMP MIB object
DOCS-IF-MIB::docsIfCmtsChannelUtilizationInterval does not persist after a
reload of a Cisco uBR7200 series CMTS.
Condition: The issue becomes apparent after the CMTS is reloaded or reset.
Workaround: There is no workaround.
CSCsg81770
Symptom: A subinterface with ifIndex=62 does not show up in ifMIB output.
Condition: This occurs during router configuration. If the ifIndex value=62 is
assigned to a subinterface (non hardware interface descriptor block (HWIDB)),
then the subinterface may not show up in the ifMIB output.
Workaround: Enabling snmp ifindex persist on the router such that ifIndex=62 is
assigned to a HWIDB, or configuring the router's interfaces in an order such that
ifIndex=62 is assigned to a HWIDB. The router remains in this state until a reload.
CSCek74598
Symptom: Following warning message is logged in the CMTS router log report:
%UBR10000-3-SEMLOCKFAIL: Unable to lock the semaphore
Condition: Changing the modulation or frequency often triggers this warning
message.
Workaround: There is no workaround.
CSCsu27822
Symptom: While performing an online insertion and removal (OIR) operation on
the Cisco uBR7246VXR router or the Cisco uBR7246 router, the Network
Processing Engine (NPE) crashes.
This occurs since an Inter-Process Communication (IPC) is sent to a removed
linecard.
Workaround: Add a flag to avoid sending IPC to the removed linecards.
CSCsu77134
Symptom: Service class name field is empty in SAMIS records for deleted PCMM
flow. SNMP MIB docsQosServiceFlowLogServiceClassName is also empty for
these flows.
Workaround: There is no workaround.
Open Caveats for Release 12.3(23)BC4
Table 24 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC4
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
129
Caveats for Cisco IOS Release 12.3 BC
Table 24
Open Caveats for Cisco IOS Release 12.3(23)BC4
DDTS ID Number
Description
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets
and the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
CSCsl50455
Symptom: A customer premises equipment (CPE) is deleted from the cable
modem termination systems (CMTS) database, and the network connectivity is
lost.
Condition: This happens in an MPLS-VPN setup, where cable modem (CM) and
CPE are in different virtual private network (VPN) routing/forwarding instances
(VRF) and source verification with lease query is enabled.
If a legitimate CPE is removed from the CMTS database, and an upstream packet
is initiated from CPE, a lease query is generated by the CMTS and sent to the
dynamic host configuration protocol (DHCP) server. The lease query response is
received from the DHCP server but, the CMTS fails to add the CPE into the
database. As a result, the CPE loses its network connectivity.
Workaround: The CPE has to go through the DHCP cycle again. The CPE is added
to the CMTS database and network connectivity at the CPE is restored.
CSCsk97436
Symptom: Spurious memory access traceback is observed.
Condition: This is observed after changing the cable bundle command on a cable
interface with a cable bundle that has ip vrf forwarding command configured.
Workaround: Disable multicast on the cable bundle interface.
Resolved Caveats for Release 12.3(23)BC4
There are no resolved caveats for Cisco IOS Release 12.3(23)BC4.
Open Caveats for Release 12.3(21a)BC8
Table 25 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(21a)BC8
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
130
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 25
Open Caveats for Cisco IOS Release 12.3(21a)BC8
DDTS ID Number
Description
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets and
the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
Resolved Caveats for Release 12.3(21a)BC8
Table 26 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(21a)BC8
release.
Table 26
Resolved Caveats for Cisco IOS release 12.3(21a)BC8
DDTS ID Number
Description
CSCso63914
Symptom: The Cisco uBR-MC28U cards are not sending SNMP cable modem
on/off traps messages.
Condition: This issue only happens on Cisco uBR-MC28U cable cards and routers
configured with bundle subinterface.
Workaround: Use bundle interface rather than subinterface.
CSCsk00618
Symptom: The cable interfaces are in shutdown state.
Condition: This occurs during booting. This issue was first detected in routers
running Cisco IOS release 12.3(21a)BC7 and later found on routers running later
Cisco IOS releases.
Workaround: There is no workaround.
CSCsl87023
Symptom: Different values of upstream center frequency are seen in the output of
show running-config and show controllers commands. The 16 KHz resolution
configured on the new line card is not correct.
Condition: This occurs when fixed upstream center frequency is configured.
Workaround: This error is cosmetic and has no effect on the behavior of the line
card.
CSCso48916
Symptom: The Cisco uBR-MC28U cable interface line card reloads after every
software upgrade.
Condition: This occurs during an upgrade.
Workaround: There is no workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
131
Caveats for Cisco IOS Release 12.3 BC
Table 26
Resolved Caveats for Cisco IOS release 12.3(21a)BC8
DDTS ID Number
Description
CSCsi05373
Symptom: A Cisco uBR7246VXR router may unexpectedly reload due to bus error
(Signal = 10, Code = 0x10) and spurious accesses may be observed.
Condition: This issue may occur under the following conditions:
•
The router is running Cisco IOS Release 12.3(21)BC. This issue also exists on
routers running later Cisco IOS releases
•
The cable modems used were exclusively “Scientific Atlanta EPC2203” and
have issue to get grant from the router
Workaround: Do not ping or telnet to the modem while a phone call is crossing it.
CSCek52673
Symptom: A router reloads after receiving a malformed UDP packet.
Condition: Dynamic Host Configuration Protocol (DHCP) is enabled on the router.
Workaround: There is no workaround.
CSCsq05487
Symptom: DHCPDISCOVER message received from the client to the cable modem
termination systems (CMTS) relay agent fails to reach the CMTS, and the Dynamic
Host Configuration Protocol (DHCP) server. As a result, the cable modem fail to
complete DHCP, and fails to get online.
Condition: Another router exists between the CMTS relay agent and server.
Workaround: Configure ip proxy-arp on the network interface of the router that
faces the CMTS.
CSCso35102
Symptom: Cable modems may not go online on certain upstream interfaces on
routers running Cisco IOS Release 12.3(21a)BC6. The modems do not reach the
init(rc) state as well.
Condition: The issue is was first detected routers running Cisco IOS Release
12.3(21a)BC6 and later found on routers running later Cisco IOS Releases.
Workaround: Use the shut/no shut command to fix the issue.
CSCsg81770
Symptom: A subinterface with ifIndex=62 does not show up in ifMIB output.
Condition: This occurs during router configuration. If the ifIndex value=62 is
assigned to a subinterface (non hardware interface descriptor block (HWIDB)),
then the subinterface may not show up in the ifMIB output.
Workaround: Enabling snmp ifindex persist on the router such that ifIndex=62 is
assigned to a HWIDB, or configuring the router's interfaces in an order such that
ifIndex=62 is assigned to a HWIDB. The router remains in this state until a reload.
CSCsm77199
Symptom: If the HTTP secure server is configured on the switch, the error message
"%DATACORRUPTION-1-DATAINCONSISTENCY: copy error" is displayed
with tracebacks. This happens after the initialization of the supervisor.
Condition: This occurs when ip http server command is configured.
Workaround: Execute the no ip http server command. The switch functionality is
not affected by this error message. The problem is cosmetic.
CSCsj46707
Symptom: Normal operation of the router is suspended during bootup.
Condition: This occurs as a result of a race condition caused by the order of
operations in console_init(). The router hangs and gives traceback.
Workaround: There is no workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
132
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 26
Resolved Caveats for Cisco IOS release 12.3(21a)BC8
DDTS ID Number
Description
CSCsq37824
Symptom: Memory overflow risk may occur with string overflow.
Condition: This occurs during source code analysis.
Workaround: There is no workaround.
CSCsh69471
Symptom: AAA accounting requests are being sent with empty user name. This
user name is not displayed using the show command and the show accounting
commands for the affected accounting traffic.
Condition: This occurs when commands are executed from a remote host using
remote shell.
Workaround: There is no workaround.
CSCsg91306
Multiple vulnerabilities exist in the Session Initiation Protocol (SIP)
implementation in Cisco IOS that can be exploited remotely to trigger a memory
leak or to cause a reload of the Cisco IOS device.
Cisco has released free software updates that address these vulnerabilities. Fixed
Cisco IOS software listed in the Software Versions and Fixes section contains fixes
for all vulnerabilities addressed in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself, if administrators
do not require the Cisco IOS device to provide voice over IP services.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml.
CSCsk42759
Multiple vulnerabilities exist in the Session Initiation Protocol (SIP)
implementation in Cisco IOS that can be exploited remotely to trigger a memory
leak or to cause a reload of the Cisco IOS device.
Cisco has released free software updates that address these vulnerabilities. Fixed
Cisco IOS software listed in the Software Versions and Fixes section contains fixes
for all vulnerabilities addressed in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself, if administrators
do not require the Cisco IOS device to provide voice over IP services.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml.
CSCsg91306
Symptom: The access server may reload due to software forced crash, causing
memory corruption in the processor memory pool of the router.
Condition: This occurs when SIP and VoIP protocols are configured on the router
and the erroneous message is received.
Workaround: There is no workaround.
Open Caveats for Release 12.3(23)BC3
Table 27 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC3
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
133
Caveats for Cisco IOS Release 12.3 BC
Table 27
Open Caveats for Cisco IOS release 12.3(23)BC3
DDTS ID Number
Description
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets and
the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
CSCsl50455
Symptom: A customer premises equipment (CPE) is deleted from the cable modem
termination systems (CMTS) database, and the network connectivity is lost.
Condition: This happens in an MPLS-VPN setup, where cable modem (CM) and
CPE are in different virtual private network (VPN) routing/forwarding instances
(VRF) and source verification with lease query is enabled.
If a legitimate CPE is removed from the CMTS database, and an upstream packet
is initiated form the CPE, a lease query is generated by the CMTS and sent to the
dynamic host configuration protocol (DHCP) server. The lease query response is
received from the DHCP server but, the CMTS fails to add the CPE into the
database. As a result, the CPE loses its network connectivity.
Workaround: The CPE has to go through the DHCP cycle again. The CPE is added
to the CMTS database and network connectivity at the CPE is restored.
CSCsk97436
Symptom: Spurious memory access traceback is observed.
Condition: This is observed after changing the cable bundle command on a cable
interface with a cable bundle that has ip vrf forwarding command configured.
Workaround: Disable multicast on the cable bundle interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
134
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(23)BC3
Table 28 ists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco 12.3(23)BC3
release.
Table 28
Resolved Caveats for Cisco IOS release 12.3(23)BC3
DDTS ID Number
Description
CSCso63914
Symptom: The Cisco uBR-MC28U cards are not sending SNMP cable modem
on/off traps messages.
Condition: This issue only happens on Cisco uBR-MC28U cable cards and routers
configured with bundle subinterface.
Workaround: Use bundle interface rather than subinterface.
CSCsl87023
Symptom: Different values of upstream center frequency are seen in while
executing show running-config and show controllers commands. The 16 KHz
resolution configured on the new linecard is not correct.
Condition: This occurs when fixed upstream center frequency is configured.
Workaround: This error is cosmetic and has no effect on the behaviour of the line
card.
CSCsm77199
Symptom: If the HTTP secure server is configured on the switch, the error message
"%DATACORRUPTION-1-DATAINCONSISTENCY: copy error" is displayed
with tracebacks. This happens after the initialization of the supervisor.
Condition: This occurs when ip http server command is configured.
Workaround: Execute the no ip http server command. The switch functionality is
not affected by this error message. The problem is cosmetic.
CSCsq37824
Symptom: Memory overflow risk may occur with string overflow.
Condition: This occurs during source code analysis.
Workaround: There is no workaround for this.
Open Caveats for Release 12.3(23)BC2
Table 29 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(23)BC2
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
135
Caveats for Cisco IOS Release 12.3 BC
Table 29
Open Caveats for Cisco IOS Release 12.3(23)BC2
DDTS ID Number
Description
CSCso35102
Cable modems may not go online on certain upstream interfaces on routers running
Cisco IOS Release 12.3(21a)BC6. The modems do not reach the init(rc) state as
well.
The issue is found on routers running Cisco IOS Release 12.3(21a)BC6.
Workaround: Use the shut/no shut command to fix the issue.
CSCsl50455
A CPE loses network connectivity when it is deleted from the CMTS database.
This is observed in an MPLS-VPN setup, where cable modems and the CPE are in
different VPN routing/ forwarding (VRF) route tables and source verification with
lease query is enabled.
Workaround: If the CPE goes through the DHCP cycle again, it will be added to the
CMTS database and the CPE's network connectivity is restored.
CSCso13213
The IP Detail Record (IPDR) document may contain corrupt characters at random
locations and may parse incorrectly.
This is observed on theCisco uBR7246 router configured with the Subscriber
Account Management Interface Specification (SAMIS) feature running Cisco IOS
Release 12.3(17b)BC4.
There are no known workarounds.
CSCso63914
The Cisco uBR-MC28U cable interface line card does not send snmp cable modem
on/off traps.
This issue occurs only on routers with the MC28U line cards.
There are no known workarounds.
Resolved Caveats for Release 12.3(23)BC2
Table 30 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(23)BC2
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
136
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 30
Resolved Caveats for Cisco IOS Release 12.3(23)BC2
DDTS ID Number
Description
CSCso81854
Multiple Cisco products are vulnerable to DNS cache poisoning attacks due to their
use of insufficiently randomized DNS transaction IDs and UDP source ports in the
DNS queries that they produce, which may allow an attacker to more easily forge
DNS answers that can poison DNS caches.
To exploit this vulnerability an attacker must be able to cause a vulnerable DNS
server to perform recursive DNS queries. Therefore, DNS servers that are only
authoritative, or servers where recursion is not allowed, are not affected.
Cisco has released free software updates that address these vulnerabilities.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080708-dns.shtml.
This security advisory is being published simultaneously with announcements from
other affected organizations.
CSCsm50944
A high CPU value is observed when many host IP addresses of modems are
registered with static IP addresses. This is observed when some subinterfaces are
configured using cable source-verify command and other subinterfaces in the
same bundle are configured using cable source-verify dhcp command.
Workaround: Use cable source-verify dhcp command on both the subinterfaces.
As for the static IP addresses, reserve these addresses in the DHCP server.
CSCsg35077
A device that is running Cisco IOS software may crash during processing of an
Internet Key Exchange (IKE) message.
Workaround: Customers that do not require IPsec functionality on their devices can
use the no crypto isakmp enable command in global configuration mode to
disable the processing of IKE messages and eliminate device exposure.
If IPsec is configured, this bug may be mitigated by applying access control lists
that limit the hosts or IP networks that are allowed to establish IPsec sessions with
affected devices. This assumes that IPsec peers are known. This workaround may
not be feasible for remote access VPN gateways where the source IP addresses of
VPN clients are not known in advance. ISAKMP uses port UDP/500 and can also
use UDP/848 (the GDOI port) when GDOI is in use.
CSCsi05373
A Cisco UBR7246 router may unexpectedly reload due to bus error (Signal = 10,
Code = 0x10) and spurious accesses may be observed.
This issue may occur under the following conditions:
•
The UBR is running Cisco IOS Release 12.3(21)BC
•
The Modems used were exclusively “Scientific Atlanta EPC2203” and have
issue to get grant from the UBR
Workaround: Do not ping or telnet to the modem while a phone call is crossing it.
CSCsi95211
The Tunnel maximum transmission unit (MTU) value is reset to 1514 bytes.
This occurs when the ip mtu value that is configured on a tunnel interface is greater
than 1514 bytes and an IP address is subsequently assigned to the Tunnel interface.
Workaround: Re-configuring the ip mtu value after the IP address has been
configured restores the ip mtu value.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
137
Caveats for Cisco IOS Release 12.3 BC
Table 30
Resolved Caveats for Cisco IOS Release 12.3(23)BC2 (continued)
DDTS ID Number
Description
CSCsm87826
The SNMP polling ccqmEnfRuleViolateTable result is different from the output of
the show cable subscriber over command. Both values should match.
Workaround: When the SF ID value is greater than 8000, use the command and not
the ccqmEnfRuleViolateTable parameter.For SF ID values less than 8000, the
SNMP parameter works fine.
CSCso48916
The Cisco uBR-MC28U cable interface line card reloads after every software
upgrade.
There are no known workarounds.
CSCsj85065
A Cisco IOS device may crash while processing an SSL packet. This can happen
during the termination of an SSL-based session. The offending packet is not
malformed and is normally received as part of the packet exchange.
Cisco has released free software updates that address this vulnerability.
Aside from disabling affected services, there are no available workarounds to
mitigate an exploit of this vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml.
Open Caveats for Release 12.3(21a)BC7
Table 31 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC7
release.
Table 31
Open Caveats for Cisco IOS Release 12.3(21a)BC7
DDTS ID Number
Description
CSCsi43840
Symptom: In the Cisco uBR7246VXR, the Cisco uBR-MC28U line card resets and
the crash file is not generated in the bootflash.
Condition: This occurs on a Cisco uBR7246VXR router with multiple Cisco
uBR-MC28U line cards. The problem was first detected on a router running Cisco
IOS Release 12.3(17b)BC4, but also exists in routers running later Cisco IOS
software releases.
Workaround: There is no workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
138
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 31
Open Caveats for Cisco IOS Release 12.3(21a)BC7 (continued)
DDTS ID Number
Description
CSCsl50455
A CPE loses network connectivity when it is deleted from the CMTS database.
This is observed in an MPLS-VPN setup, where cable modems and the CPE are in
different VPN routing/ forwarding (VRF) route tables and source verification with
lease query is enabled.
Workaround: If the CPE goes through the DHCP cycle again, it will be added to the
CMTS database and the CPE's network connectivity is restored.
CSCso13213
The IP Detail Record (IPDR) document may contain corrupt characters at random
locations and may parse incorrectly.
This is observed on theCisco uBR7246 router configured with the Subscriber
Account Management Interface Specification (SAMIS) feature running Cisco IOS
Release 12.3(17b)BC4.
There are no known workarounds.
Resolved Caveats for Release 12.3(21a)BC7
Table 32 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC7
release.
Table 32
Resolved Caveats for Cisco IOS Release 12.3(21a)BC7
DDTS ID Number
Description
CSCsm50944
A high CPU value is observed when many host IP addresses of modems are
registered with static IP addresses. This is observed when some subinterfaces are
configured using cable source-verify command and other subinterfaces in the
same bundle are configured using cable source-verify dhcp command.
Workaround: Use cable source-verify dhcp command on both the subinterfaces.
As for the static IP addresses, reserve these addresses in the DHCP server.
CSCsl82266
Loop occurs between uBR and CNR during leasequery. At the loop condition, you
can see several leasequeries per second and after a while, the loop ends
automatically.
This issue occurs on following conditions:
•
source-verify dhcp is enabled.
•
CNR failover setup (Redundant CNR).
•
The target IP of the leasequery loop should be a CPE which is connected to
currently offline CM and ARP entry for the CPE aged out.
There are no known workarounds.
CSCsk74962
Router is experiencing spurious memory access while running the show buffer
assigned dump command.
This issue does not cause any operational problems.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
139
Caveats for Cisco IOS Release 12.3 BC
Table 32
Resolved Caveats for Cisco IOS Release 12.3(21a)BC7 (continued)
DDTS ID Number
Description
CSCsl73391
CMTS sysUpTime parameter remains unchanged in IPDR document for all records
thus making it unreliable for stop records. Similarly, IPDRcreationTime parameters
are the same for interim records and are set to the data collection start time for the
IPDR document. These may cause certain accounting issues.
This issue occurs when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
Workaround: Poll the DOCS-QOS-MIB object directly.
CSCsl61201
CMTS generates duplicate IPDR records for same service identifier (SID). This
creates accounting issues for usage-based billing of cable modems.
This issue occurs on uBR10k and uBR7k platforms running Cisco IOS Release
12.3(17b)BC4 when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
CSCsm87826
The SNMP polling ccqmEnfRuleViolateTable result is different from the output of
the show cable subscriber over command. Both values should match.
Workaround: When the SF ID value is greater than 8000, use the command and not
the ccqmEnfRuleViolateTable parameter.For SF ID values less than 8000, the
SNMP parameter works fine.
CSCsj85065
A Cisco IOS device may crash while processing an SSL packet. This can happen
during the termination of an SSL-based session. The offending packet is not
malformed and is normally received as part of the packet exchange.
Cisco has released free software updates that address this vulnerability.
Aside from disabling affected services, there are no available workarounds to
mitigate an exploit of this vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml.
Open Caveats for Release 12.3(23)BC1
Table 33 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(23)BC1
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
140
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 33
Open Caveats for Cisco IOS Release 12.3(23)BC1
DDTS ID Number
Description
CSCsm50944
A high CPU value is observed when many host IP addresses of modems are
registered with static IP addresses. This is observed when some subinterfaces are
configured using cable source-verify command and other subinterfaces in the
same bundle are configured using cable source-verify dhcp command.
Workaround: Use cable source-verify dhcp command on both the subinterfaces.
As for the static IP addresses, reserve these addresses in the DHCP server.
CSCsi43840
A 28u Card resets with no unexpected reloads file being generated in bootflash.
This may occur on a router with multiple 28u cards and running Cisco IOS Release
12.3(17b)BC4.
There are no known workarounds.
CSCsl50455
A CPE loses network connectivity when it is deleted from the CMTS database.
This is observed in an MPLS-VPN setup, where cable modems and the CPE are in
different VPN routing/ forwarding (VRF) route tables and source verification with
lease query is enabled.
Workaround: If the CPE goes through the DHCP cycle again, it will be added to the
CMTS database and the CPE's network connectivity is restored.
Resolved Caveats for Release 12.3(23)BC1
Table 34 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(23)BC1
release.
Table 34
Resolved Caveats for Cisco IOS Release 12.3(23)BC1
DDTS ID Number
Description
CSCsl73391
CMTS sysUpTime parameter remains unchanged in IPDR document for all records
thus making it unreliable for stop records. Similarly, IPDRcreationTime parameters
are the same for interim records and are set to the data collection start time for the
IPDR document. These may cause certain accounting issues.
This issue occurs when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
Workaround: Poll the DOCS-QOS-MIB object directly.
CSCsl61201
CMTS generates duplicate IPDR records for same service identifier (SID). This
creates accounting issues for usage-based billing of cable modems.
This issue occurs on uBR10k and uBR7k platforms running Cisco IOS Release
12.3(17b)BC4 when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
141
Caveats for Cisco IOS Release 12.3 BC
Table 34
Resolved Caveats for Cisco IOS Release 12.3(23)BC1 (continued)
DDTS ID Number
Description
CSCsd71318
Cisco 2800 series router crashes when the connection to the URL filter server is
reset, either due to network congestion or during a warm/cold reload.
This issue occurs with external Websense or N2H2 server.
Workaround: There are no known workarounds for cold/warm reload. For crash due
to network congestion or WAN reset, remove the condition that causes the
connection to the URL filter to flap.
CSCsk74962
Router is experiencing spurious memory access while running the show buffer
assigned dump command.
This issue does not cause any operational problems.
There are no known workarounds.
CSCsh69471
AAA accounting requests are being sent with empty user name. This issue occurs
while using the show command to see the executor of the show accounting
commands for the affected accounting traffic.
Workaround: No workaround is required as it is only a display issue.
CSCsl32567
When executing show aaa attribute protocol radius command, the router running
Cisco IOS may crash or display junk characters.
There are no known workarounds.
CSCsl82266
Loop occurs between uBR and CNR during leasequery. At the loop condition, you
can see several leasequeries per second and after a while, the loop ends
automatically.
This issue occurs on following conditions:
•
source-verify dhcp is enabled.
•
CNR failover setup (Redundant CNR).
•
The target IP of the leasequery loop should be a CPE which is connected to
currently offline CM and ARP entry for the CPE aged out.
There are no known workarounds.
CSCsk70446
Traceback observed while using long URLs to configure a device using the Cisco
IOS HTTP web parser.
This issue occurs while trying to configure commands that have a single keyword
or parameter greater than N characters in length, where N is:
•
50 for Cisco IOS Release 12.0 and above
•
128 for Cisco IOS Release 12.2 and above
•
256 for Cisco IOS Release 12.2(25) and above
Workaround: Avoid using the Cisco IOS HTTP web parser for commands with long
keywords or arguments.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
142
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 34
Resolved Caveats for Cisco IOS Release 12.3(23)BC1 (continued)
DDTS ID Number
Description
CSCsj93719
A Cisco uBR7246VXR router with an NPE-G1 reboots. The system returns to
ROM with the following error:
Software forced crash, PC 0x6094918C
The crash occurs because the redzone is overwritten in the I/O memory pool.
There are no known workarounds.
CSCsk10579
A slow leak may occur on a UBR7200 in the CMTS MAC Parser process.
There are no known workarounds.
CSCsl73702
The uBR7246VXR CMTS router crashes with a bus error at 0x0 address.
There are no known workarounds.
CSCsh29217
Cisco 10000, uBR10012 and uBR7200 series devices use a User Datagram
Protocol (UDP) based Inter-Process Communication (IPC) channel that is
externally reachable. An attacker could exploit this vulnerability to cause a denial
of service (DoS) condition on affected devices. No other platforms are affected.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml.
Open Caveats for Release 12.3(21a)BC6
Table 35 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC6
release.
Table 35
Open Caveats for Cisco IOS Release 12.3(21a)BC6
DDTS ID Number
Description
CSCsl73391
CMTS sysUpTime parameter remains unchanged in IPDR document for all records
thus making it unreliable for stop records. Similarly, IPDRcreationTime parameters
are the same for interim records and are set to the data collection start time for the
IPDR document. These may cause certain accounting issues.
This issue occurs when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
Workaround: Poll the DOCS-QOS-MIB object directly.
CSCsl61201
CMTS generates duplicate IPDR records for same service identifier (SID). This
creates accounting issues for usage-based billing of cable modems.
This issue occurs on uBR10k and uBR7k platforms running Cisco IOS Release
12.3(17b)BC4 when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
CSCsi46184
IOS crashes, when you remove a PCMCIA card that is in use.
Workaround: Do NOT remove the flash card when it is in use.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
143
Caveats for Cisco IOS Release 12.3 BC
Table 35
Open Caveats for Cisco IOS Release 12.3(21a)BC6 (continued)
DDTS ID Number
Description
CSCek76143
DOCSIS dynamic state queue can be corrupted and cause a CMTS RP or LC
unexpected reload in cmts_get_dyn_transc_state. This is a suspected cause of
unexpected reloads in CSCek70406.
This issue occurs with dynamic service flows created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsh41532
PCMM volume-based-usage exceeded should send up a gate-report-state but this is
not working as expected.
The volume-based-usage counter is supposed to be reset when a modification is
made to it on an existing gate. This should send gate-report-state after the new
value has been reached. The counter seems to be retaining the original value in a
test case.
There are no known workarounds.
CSCsh68970
Samis tries to use bpe address as source address, which result in connection failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
144
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 35
Open Caveats for Cisco IOS Release 12.3(21a)BC6 (continued)
DDTS ID Number
Description
CSCsi68543
TLS is working OK right after is configured originally. If TLS is deconfigured and
then reactivated again, the corresponding Ethernet interface is not set to
promiscuous mode
Before the configuration changes:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E29
Promiscuous mode ON
After the TLS configuration was reapplied:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E28
Promiscuous mode OFF
This issue occurs with TLS configuration.
Workaround: Do not disable TLS once it is enabled.
CSCsi59988
Downstream prioritization on cable interfaces during cable interface congestion is
not working when the default downstream token bucket rate-limiting with shaping
scheme is in use.
Workaround: Make use of token bucket limiting without shaping.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
145
Caveats for Cisco IOS Release 12.3 BC
Table 35
Open Caveats for Cisco IOS Release 12.3(21a)BC6 (continued)
DDTS ID Number
Description
CSCsi44396
The maximum number of virtual bundle interfaces that can be created on a CMTS
is 40. While trying to create the 41st virtual bundle interface via the CLI command,
the following error message is displayed:
Vegas-VXR(config)#int bundle 41
Exceeding maximum number of virtual bundle interfaces allowed: 40
^
% Invalid input detected at '^' marker.
Vegas-VXR(config)#
However, by using the following procedure, the CMTS allowed 41 Virtual Bundle
Interfaces. The expected result is the CMTS should not allow the 41st virtual
bundle interface to be created.
1.
Create virtual interface bundle 254 and then assign bundle254 to cable
interface 3/0 and 3/1
2.
Issue the following command hw-module slot 3 shutdown powered (This
powers down the card)
3.
Delete virtual interface bundle 254 (no interface bundle 254)
4.
Create virtual interface bundle 1-40
5.
Bring up the card that was shutdown in step 2 with no hw-module slot 3
shutdown powered
6.
You will now see 41 interface bundles.
There are no known workarounds.
CSCsk60162
Voice assigned to an Unsolicited Grant Services (UGS) flow is not seen on the
sniffer, intercepted packet.
This issue occurs sporadically on an MC28X card.
Workaround: Execute a shut/no shut of the cable interface.
CSCsl73298
On a uBR7246VXR CMTS router, the ifHCInUcastPkts (1.3.6.1.2.1.31.1.1.1.7)
and ifInBroadcastPkts (1.3.6.1.2.1.31.1.1.1.3) MIB counters appear to be
decrementing.
There are no known workarounds.
CSCsi43840
A 28u Card resets with no unexpected reloads file being generated in bootflash.
This may occur on a router with multiple 28u cards and running Cisco IOS Release
12.3(17b)BC4.
There are no known workarounds.
CSCsl73702
The uBR7246VXR CMTS router crashes with a bus error at 0x0 address.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
146
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 35
Open Caveats for Cisco IOS Release 12.3(21a)BC6 (continued)
DDTS ID Number
Description
CSCsl50133
A uBR7200 will reload with following:
No crashinfo
No tracebacks
Last reload reason: Unknown reason
Last reset from watchdog reset
There are no known workarounds.
CSCsk43650
SNMPwalk of docsIfCmtsCmStatusValue does not show results for all the
available modems. The deviation can be identified by comparing the results from
the command line interface with those from the SNMPwalk.
There are no known workarounds.
Resolved Caveats for Release 12.3(21a)BC6
There are no resolved caveats for the Cisco IOS 12.3(21a)BC6 release.
Open Caveats for Release 12.3(21a)BC5
Table 36 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC5
release.
Table 36
Open Caveats for Cisco IOS Release 12.3(21a)BC5
DDTS ID Number
Description
CSCsl73391
CMTS sysUpTime parameter remains unchanged in IPDR document for all records
thus making it unreliable for stop records. Similarly, IPDRcreationTime parameters
are the same for interim records and are set to the data collection start time for the
IPDR document. These may cause certain accounting issues.
This issue occurs when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
Workaround: Poll the DOCS-QOS-MIB object directly.
CSCsl61201
CMTS generates duplicate IPDR records for same service identifier (SID). This
creates accounting issues for usage-based billing of cable modems.
This issue occurs on uBR10k and uBR7k platforms running Cisco IOS Release
12.3(17b)BC4 when Subscriber Account Management Interface Specification
(SAMIS) feature is used.
CSCsi46184
IOS crashes, when you remove a PCMCIA card that is in use.
Workaround: Do NOT remove the flash card when it is in use.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
147
Caveats for Cisco IOS Release 12.3 BC
Table 36
Open Caveats for Cisco IOS Release 12.3(21a)BC5 (continued)
DDTS ID Number
Description
CSCek76143
DOCSIS dynamic state queue can be corrupted and cause a CMTS RP or LC
unexpected reload in cmts_get_dyn_transc_state. This is a suspected cause of
unexpected reloads in CSCek70406.
This issue occurs with dynamic service flows created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsh41532
PCMM volume-based-usage exceeded should send up a gate-report-state but this is
not working as expected.
The volume-based-usage counter is supposed to be reset when a modification is
made to it on an existing gate. This should send gate-report-state after the new
value has been reached. The counter seems to be retaining the original value in a
test case.
There are no known workarounds.
CSCsh68970
SAMIS tries to use bpe address as source address, which result in connection
failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
148
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 36
Open Caveats for Cisco IOS Release 12.3(21a)BC5 (continued)
DDTS ID Number
Description
CSCsi68543
TLS is working OK right after is configured originally. If TLS is deconfigured and
then reactivated again, the corresponding Ethernet interface is not set to
promiscuous mode
Before the configuration changes:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E29
Promiscuous mode ON
After the TLS configuration was reapplied:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E28
Promiscuous mode OFF
This issue occurs with TLS configuration.
Workaround: Do not disable TLS once it is enabled.
CSCsi59988
Downstream prioritization on cable interfaces during cable interface congestion is
not working when the default downstream token bucket rate-limiting with shaping
scheme is in use.
Workaround: Make use of token bucket limiting without shaping.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
149
Caveats for Cisco IOS Release 12.3 BC
Table 36
Open Caveats for Cisco IOS Release 12.3(21a)BC5 (continued)
DDTS ID Number
Description
CSCsi44396
The maximum number of virtual bundle interfaces that can be created on a CMTS
is 40. While trying to create the 41st virtual bundle interface via the CLI command,
the following error message is displayed:
Vegas-VXR(config)#int bundle 41
Exceeding maximum number of virtual bundle interfaces allowed: 40
^
% Invalid input detected at '^' marker.
Vegas-VXR(config)#
However, by using the following procedure, the CMTS allowed 41 Virtual Bundle
Interfaces. The expected result is the CMTS should not allow the 41st virtual
bundle interface to be created.
1.
Create virtual interface bundle 254 and then assign bundle254 to cable
interface 3/0 and 3/1
2.
Issue the following command hw-module slot 3 shutdown powered (This
powers down the card)
3.
Delete virtual interface bundle 254 (no interface bundle 254)
4.
Create virtual interface bundle 1-40
5.
Bring up the card that was shutdown in step 2 with no hw-module slot 3
shutdown powered
6.
You will now see 41 interface bundles.
There are no known workarounds.
CSCsk60162
Voice assigned to an Unsolicited Grant Services (UGS) flow is not seen on the
sniffer, intercepted packet.
This issue occurs sporadically on an MC28X card.
Workaround: Execute a shut/no shut of the cable interface.
CSCsl73298
On a uBR7246VXR CMTS router, the ifHCInUcastPkts (1.3.6.1.2.1.31.1.1.1.7)
and ifInBroadcastPkts (1.3.6.1.2.1.31.1.1.1.3) MIB counters appear to be
decrementing.
There are no known workarounds.
CSCsi43840
A 28u Card resets with no unexpected reloads file being generated in bootflash.
This may occur on a router with multiple 28u cards and running Cisco IOS Release
12.3(17b)BC4.
There are no known workarounds.
CSCsl73702
The uBR7246VXR CMTS router crashes with a bus error at 0x0 address.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
150
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 36
Open Caveats for Cisco IOS Release 12.3(21a)BC5 (continued)
DDTS ID Number
Description
CSCsl50133
A uBR7200 will reload with following:
No crashinfo
No tracebacks
Last reload reason: Unknown reason
Last reset from watchdog reset
There are no known workarounds.
CSCsk43650
SNMPwalk of docsIfCmtsCmStatusValue does not show results for all the
available modems. The deviation can be identified by comparing the results from
the command line interface with those from the SNMPwalk.
There are no known workarounds.
Resolved Caveats for Release 12.3(21a)BC5
Table 37 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC5
release.
Table 37
Resolved Caveats for Cisco IOS Release 12.3(21a)BC5
DDTS ID Number
Description
CSCsj93719
A Cisco uBR7246VXR router with an NPE-G1 reboots. The system returns to
ROM with the following error:
Software forced crash, PC 0x6094918C
The crash occurs because the redzone is overwritten in the I/O memory pool.
There are no known workarounds.
CSCsk10579
A slow leak may occur on a UBR7200 in the CMTS MAC Parser process.
There are no known workarounds.
CSCsl32567
When executing show aaa attribute protocol radius command, the router running
Cisco IOS may crash or display junk characters.
There are no known workarounds.
CSCsk70446
Traceback observed while using long URLs to configure a device using the Cisco
IOS HTTP web parser.
This issue occurs while trying to configure commands that have a single keyword
or parameter greater than N characters in length, where N is:
•
50 for Cisco IOS Release 12.0 and above
•
128 for Cisco IOS Release 12.2 and above
•
256 for Cisco IOS Release 12.2(25) and above
Workaround: Avoid using the Cisco IOS HTTP web parser for commands with long
keywords or arguments.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
151
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(23)BC
Table 38 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(23)BC
release.
Table 38
Open Caveats for Cisco IOS Release 12.3(23)BC
DDTS ID Number
Description
CSCsi43840
A 28u Card resets with no unexpected reloads file being generated in bootflash.
This may occur on a router with multiple 28u cards and running Cisco IOS Release
12.3(17b)BC4.
There are no known workarounds.
CSCsi59988
Downstream prioritization on cable interfaces during cable interface congestion is
not working when the default downstream token bucket rate-limiting with shaping
scheme is in use.
Workaround: Make use of token bucket limiting without shaping.
CSCsj14143
ifHCOutOctets and ifHCInOctets values retrieved from the IF-MIB are not correct.
There are no known workarounds.
CSCsj81080
Two Cisco uBR7246VXR routers with NPE-G1s both show negative input queue
values on the cable interface. The two routers are passing traffic. The bundled
virtual interfaces on the devices have a non-decreasing positive input queue.
Workaround: The negative input queue values issue is cosmetic; the interface still
passes traffic. The continuously growing input queue on the bundled interface can
be cleared by reloading the device.
CSCsk10579
A slow leak may occur on a UBR7200 in the CMTS MAC Parser process.
There are no known workarounds.
CSCsk59791
A Cisco router running Cisco IOS Release 12.3(17a)BC2 may have all CM
connected on the cable interface go offline.
Workaround: Use the shut/no shut cable interface.
CSCsk60162
Voice assigned to an Unsolicited Grant Services (UGS) flow is not seen on the
sniffer, intercepted packet.
This issue occurs sporadically on an MC28X card.
Workaround: Execute a shut/no shut of the cable interface.
CSCsk97436
After changing the cable bundle <x> command on a cable interface with a cable
bundle that has ip vrf forwarding configured, a spurious memory access traceback
was observed.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
152
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 38
Open Caveats for Cisco IOS Release 12.3(23)BC (continued)
DDTS ID Number
Description
CSCsl49015
After replacing the MC16 card, they cannot see the interface values return through
SNMP.
All the cable interfaces that was involved in hot-swapping had this issue. CU
swapped the following:
MC16 to new MC16
MC16 to new MC28
This is different to the bug CSCsc07829 as only the upstream and downstream port
indexes for a certain cable interface are not getting registered.
Workaround: Rebooting the device resolved the issue.
CSCsl50133
A uBR7200 will reload with following:
No crashinfo
No tracebacks
Last reload reason: Unknown reason
Last reset from watchdog reset
There are no known workarounds.
CSCsk86886
A Cisco router running IOS version 123(17b)BC8 may reload unexpectedly.
There are no known workarounds.
Resolved Caveats for Release 12.3(23)BC
Table 39 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(23)BC
release.
Table 39
Resolved Caveats for Cisco IOS Release 12.3(23)BC
DDTS ID Number
Description
CSCek76143
DOCSIS dynamic state queue can be corrupted and cause a CMTS RP or LC
unexpected reload in cmts_get_dyn_transc_state. This is a suspected cause of
unexpected reloads in CSCek70406.
This issue occurs with dynamic service flows created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCsd65958
Packets per second is far greater than bytes per sec on some of the line
cardinterfaces, which should not be possible.
This issue occurs when the layer 2 traffic contains broadcast traffic.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
153
Caveats for Cisco IOS Release 12.3 BC
Table 39
Resolved Caveats for Cisco IOS Release 12.3(23)BC (continued)
DDTS ID Number
Description
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsh04686
With X25 over TCP (XOT) enabled on a router or catalyst switch, malformed traffic
sent to TCP port 1998 will cause the device to reload. This was first observed in
IOS 12.2(31)SB2.
Workarounds: Use IPSEC or other tunneling mechanisms to protect XOT traffic.
Also, apply ACLs on affected devices so that traffic is only accepted from trusted
tunnel endpoints.
CSCsh41532
PCMM volume-based-usage exceeded should send up a gate-report-state but this is
not working as expected.
The volume-based-usage counter is supposed to be reset when a modification is
made to it on an existing gate. This should send gate-report-state after the new
value has been reached. The counter seems to be retaining the original value in a
test case.
There are no known workarounds.
CSCsh68970
SAMIS tries to use bpe address as source address, which result in connection
failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
154
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 39
Resolved Caveats for Cisco IOS Release 12.3(23)BC (continued)
DDTS ID Number
Description
CSCsi44396
The maximum number of virtual bundle interfaces that can be created on a CMTS
is 40. While trying to create the 41st virtual bundle interface via the CLI command,
the following error message is displayed:
Vegas-VXR(config)#int bundle 41
Exceeding maximum number of virtual bundle interfaces allowed: 40
^
% Invalid input detected at '^' marker.
Vegas-VXR(config)#
However, by using the following procedure, the CMTS allowed 41 Virtual Bundle
Interfaces. The expected result is the CMTS should not allow the 41st virtual
bundle interface to be created.
1.
Create virtual interface bundle 254 and then assign bundle254 to cable
interface 3/0 and 3/1
2.
Issue the following command hw-module slot 3 shutdown powered (This
powers down the card)
3.
Delete virtual interface bundle 254 (no interface bundle 254)
4.
Create virtual interface bundle 1-40
5.
Bring up the card that was shutdown in step 2 with no hw-module slot 3
shutdown powered
6.
You will now see 41 interface bundles.
There are no known workarounds.
CSCsi68543
TLS is working OK right after is configured originally. If TLS is deconfigured and
then reactivated again, the corresponding Ethernet interface is not set to
promiscuous mode
Before the configuration changes:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E29
Promiscuous mode ON
After the TLS configuration was reapplied:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E28
Promiscuous mode OFF
This issue occurs with TLS configuration.
Workaround: Do not disable TLS once it is enabled.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
155
Caveats for Cisco IOS Release 12.3 BC
Table 39
Resolved Caveats for Cisco IOS Release 12.3(23)BC (continued)
DDTS ID Number
Description
CSCsl34893
ARP table entries are incorrect for a CPE. This can result in CPE traffic being sent
to the wrong modem.
The ARP table issue occurs for CPEs that move from one modem to another or
when one CPE goes away and the IP address is allocated to another CPE by the
DHCP server.
There are no known workarounds.
CSCsl23947
The MC11C, MC12C and MC14C cable line cards have been “End of software
maintenance release” in July 2006 or earlier. These cards will not be recognized on
the uBR7200 running a 12.3(23)BC image.
There are no known workarounds.
CSCsl61679
The MC16E and MC16S cards reached “End of software maintenance release” and
“End of routine failure analysis” on July 5, 2006 as per the EOL notice:
http://www.cisco.com/en/US/partner/products/hw/modules/ps4302/prod_eol_
notice0900aecd801e8a41.html
Note that even though these cards will be recognized on the uBR7200 running a
12.3(23)BC image, these cards are no longer supported in the software and are
subjected to minimal testing.
There are no known workarounds.
CSCsh29217
Cisco 10000, uBR10012 and uBR7200 series devices use a User Datagram
Protocol (UDP) based Inter-Process Communication (IPC) channel that is
externally reachable. An attacker could exploit this vulnerability to cause a denial
of service (DoS) condition on affected devices. No other platforms are affected.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml.
Open Caveats for Release 12.3(21a)BC4
Table 40 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC4
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
156
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 40
Open Caveats for Cisco IOS Release 12.3(21a)BC4
DDTS ID Number
Description
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsh41532
PCMM volume-based-usage exceeded should send up a gate-report-state but this is
not working as expected.
The volume-based-usage counter is supposed to be reset when a modification is
made to it on an existing gate. This should send gate-report-state after the new
value has been reached. The counter seems to be retaining the original value in a
test case.
There are no known workarounds.
CSCsh68970
Samis tries to use bpe address as source address, which result in connection failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
CSCsi43840
A 28u Card resets with no unexpected reloads file being generated in bootflash.
This may occur on a router with multiple 28u cards and running Cisco IOS Release
12.3(17b)BC4.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
157
Caveats for Cisco IOS Release 12.3 BC
Table 40
Open Caveats for Cisco IOS Release 12.3(21a)BC4 (continued)
DDTS ID Number
Description
CSCsi44396
The maximum number of virtual bundle interfaces that can be created on a CMTS
is 40. While trying to create the 41st virtual bundle interface via the CLI command,
the following error message is displayed:
Vegas-VXR(config)#int bundle 41
Exceeding maximum number of virtual bundle interfaces allowed: 40
^
% Invalid input detected at '^' marker.
Vegas-VXR(config)#
However, by using the following procedure, the CMTS allowed 41 Virtual Bundle
Interfaces. The expected result is the CMTS should not allow the 41st virtual
bundle interface to be created.
1.
Create virtual interface bundle 254 and then assign bundle254 to cable
interface 3/0 and 3/1
2.
Issue the following command hw-module slot 3 shutdown powered (This
powers down the card)
3.
Delete virtual interface bundle 254 (no interface bundle 254)
4.
Create virtual interface bundle 1-40
5.
Bring up the card that was shutdown in step 2 with no hw-module slot 3
shutdown powered
6.
You will now see 41 interface bundles.
There are no known workarounds.
CSCsi59988
Downstream prioritization on cable interfaces during cable interface congestion is
not working when the default downstream token bucket rate-limiting with shaping
scheme is in use.
Workaround: Make use of token bucket limiting without shaping.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
158
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 40
Open Caveats for Cisco IOS Release 12.3(21a)BC4 (continued)
DDTS ID Number
Description
CSCsi68543
TLS is working OK right after is configured originally. If TLS is deconfigured and
then reactivated again, the corresponding Ethernet interface is not set to
promiscuous mode
Before the configuration changes:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E29
Promiscuous mode ON
After the TLS configuration was reapplied:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E28
Promiscuous mode OFF
This issue occurs with TLS configuration.
Workaround: Do not disable TLS once it is enabled.
CSCsi83966
Multiple tracebacks are observed:
313861: Apr 10 07:16:06.784 UTC: %REQGRP-3-SYSCALL: System call for
command 72 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B35B0 60C5A09C 60C5B7E0 60C58980 61005A70
610093CC 60FF9910 6101FE0C 60916AC4 60916AA8
314045: Apr 10 08:16:39.940 UTC: %REQGRP-3-SYSCALL: System call for
command 42 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606AC4A8 606AEED4 60C898A0 60C89B34 60C5AD40
60C5B188 60C5B834 60C58980 61005A70 610093CC 60FF9910 6101FE0C 60916AC4
60916AA8
313868: Apr 10 07:18:35.833 UTC: %REQGRP-3-SYSCALL: System call for
command 47 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B3D0C 606B4930 6069D1EC 6053BEC4 60886370
60897D40 60916AC4 60916AA8
This issue occurs on a Cisco uBR7246VXR router with an MC28U card. BPI and
VPN are not configured. No crashinfo is seen on PRE or line card.
Workaround: Reset affected line card with hardware module stop/start.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
159
Caveats for Cisco IOS Release 12.3 BC
Table 40
Open Caveats for Cisco IOS Release 12.3(21a)BC4 (continued)
DDTS ID Number
Description
CSCsj81080
Two Cisco uBR7246VXR routers with NPE-G1s both show negative input queue
values on the cable interface. The two routers are passing traffic. The bundled
virtual interfaces on the devices have a non-decreasing positive input queue.
Workaround: The negative input queue values issue is cosmetic; the interface still
passes traffic. The continuously growing input queue on the bundled interface can
be cleared by reloading the device.
CSCsk10579
A slow leak may occur on a UBR7200 in the CMTS MAC Parser process.
There are no known workarounds.
CSCsk17493
A slow memory leak exists in Request di and SNMP ENGINE.
This issue occurs on a router running Cisco IOS Release 12.3(17b)BC4 and the
Simple Network Management Protocol (SNMP).
There are no known workarounds.
CSCsk43650
SNMPwalk of docsIfCmtsCmStatusValue does not show results for all the
available modems. The deviation can be identified by comparing the results from
the command line interface with those from the SNMPwalk.
There are no known workarounds.
CSCsk49540
A line card memory allocation failure is causing a system slowdown. The show
cable modem, show run, and show tech commands all experience noticeable
performance slowdowns.
This issue occurs because a cable line card is running out of memory; Pool Manager
Free shows as 0, and holdong shows a large value.
There are no known workarounds.
CSCsk59791
A Cisco router running Cisco IOS Release 12.3(17a)BC2 may have all CM
connected on the cable interface go offline.
Workaround: Use the shut/no shut cable interface.
CSCsk60162
Voice assigned to an Unsolicited Grant Services (UGS) flow is not seen on the
sniffer, intercepted packet.
This issue occurs sporadically on an MC28X card.
Workaround: Execute a shut/no shut of the cable interface.
CSCsk86886
A Cisco router running IOS version 123(17b)BC8 may reload unexpectedly.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
160
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(21a)BC4
Table 41 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC4
release.
Table 41
Resolved Caveats for Cisco IOS Release 12.3(21a)BC4
DDTS ID Number
Description
CSCsa79984
When using the line subcommand login, it may be possible for a vty to get into a
state where the user will not be able to log in to the IOS router. The user will be
presented with password followed immediately by “Bad passwords”.
The line in this state can be seen with the exec command show line <line number>.
In the “Status” line, if “Ctrl-c Enabled” appears, then you may see this problem on
that line.
Workaround: To clear this condition follow these sequence of steps.
CSCsd65958
1.
First remove the login from the line.
2.
Telnet into the router on the line which is in this state.
3.
From enable mode, run the command setup. When prompted with
“Continue with configuration dialog”, type no.
4.
Add the login back to the vty line.
Packets per second is far greater than bytes per sec on some of the line card
interfaces, which should not be possible.
This issue occurs when the layer 2 traffic contains broadcast traffic.
There are no known workarounds.
CSCsg39295
Password information may be displayed in a Syslog message as follows:
%SYS-5-CONFIG_I: Configured from
scp://userid:[email protected]/config.txt by console
This issue occurs when using SNMP to modify a configuration by means of the
CISCO-CONFIG-COPY-MIB, selection of ConfigCopyProtocol of SCP or FTP
may result in the password being exposed in a syslog message.
Workaround: When using SNMP to modify a configuration by means of the
CISCO-CONFIG-COPY-MIB, use the ConfigCopyProtocol of RCP to avoid
exposure of the password.
CSCsg58537
The CLI show cable modem <mac/ip> cnr output does not have snr/cnr values.
The output shows “-----” instead of snr/cnr, even though traffic is passed through
modem.
This issue occurs in when spectrum-group is not configured on Cisco IOS Release
12.3(13a)BC or later.
Workaround: Use show cable modem <mac/ip> phy command to monitor the snr
value.
CSCsi91974
With STM1.0, the cable modem can be set in penalty even during Offpeak periods.
This issue occurs on a Cisco router running Cisco IOS Release 12.3(17b)BC5. This
issue is not seen in Cisco IOS Release 12.3(13)BC.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
161
Caveats for Cisco IOS Release 12.3 BC
Table 41
Resolved Caveats for Cisco IOS Release 12.3(21a)BC4 (continued)
DDTS ID Number
Description
CSCsj14143
ifHCOutOctets and ifHCInOctets values retrieved from the IF-MIB are not correct.
There are no known workarounds.
CSCsj43368
IP connectivity issues or observed when running Baseline Privacy Interface (BPI).
This issue occurs when running Cisco IOS Release 12.3(21a)BC1 using an MC16U
card.
Workaround: Downgrade to Cisco IOS Release 12.3(13a)BC6.
CSCsj66692
Data corruption copy error tracebacks are seen on the console or output from the
show logging command:
%DATACORRUPTION-1-DATAINCONSISTENCY: copy error, -PC= 0x41224EFC,
Traceback= 0x4153A7D0 0x4155BA0C 0x4157FAF0 0x41224EFC 0x41DDC0A8
0x41DDC198
0x41DC6D84 0x41DF3B0C 0x41DC506C 0x41DCE5A4 0x41D91AF8 0x41D90F88
0x41D9BEFC
0x41D9C0C0 0x41DAEA68
-
Refer to CSCsj44081 for more information.
There are no known workarounds.
CSCsj74381
A UBR that uses 127.x.x.x prefixes for internal management will include these
prefixes in its LDP/TDP address and label mapping messages. Peering routers that
have a fix for CSCdx08804 or CSCdx88897 will display error messages such as the
following:
%TAGCON-3-TDPID: peer 192.168.254.253:0, TDP Id/Addr mapping problem
(rcvd invalid address in TDP
address PIE, ignored)
%TAGCON-3-TDPID: peer 192.168.254.253:0, TDP Id/Addr mapping problem
(rcvd TDP address PIE, bind failed)
%TIB-3-REMOTETAG: 127.3.0.0/255.255.0.0, peer 192.168.254.253:0; tag 1;
add tag failure
The error messages are harmless. They indicate that the peer has advertised invalid
host/network IP addresses, and the receiving router has accordingly ignored the
associated advertisements.
There are no known workarounds.
CSCsk10639
CMTS router received an ARP packet with zero mac-addr for source. CMTS asked
IOS software not to create an ARP entry. IOS software still goes ahead and creates
an ARP entry with zero mac-addr.
This issue occurs when a virus attack has been mounted on the CMTS.
There are no known workarounds.
CSCsk19693
When cable source-verify dhcp is configured on the bundle interface and a static IP
is assigned to a CPE behind a cable modem, the CMTS fails to send a dhcp
lease-query and the CPE is able to get network access
Workaround: Move layer 3 configuration from a bundle interface to a subinterface.
For example, remove ip address, dhcp, and cable source-verify configuration from
“interface bundle 1” to “interface bundle 1.1”.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
162
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 41
Resolved Caveats for Cisco IOS Release 12.3(21a)BC4 (continued)
DDTS ID Number
Description
CSCsk27453
The show cable modem vendor summary total clc command does not display any
totals.
There are no known workarounds.
CSCsk85060
Replicated packets for LI so that when configured by the cable intercept CLI
command, it will not always have the same number of bytes included in the MAC
header.
This issue occurs when Mediation Devices and collection functions at law
enforcement cannot decode replicated packets when packet replication is done
using the cable intercept command. Depending upon the VoIP call, different
numbers of bytes are included in the MAC header portion.
There are no known workarounds.
Open Caveats for Release 12.3(21a)BC3
Table 42 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC3
release.
Table 42
Open Caveats for Cisco IOS Release 12.3(21a)BC3
DDTS ID Number
Description
CSCeh33888
A Cisco uBR7246VXR router may reload with Last reset from the watchdog reset.
This issue may occur when the router has a UBR7200-NPE-G1 processor board and
is running Cisco IOS 12.3(9a)BC.
There are no known workarounds.
CSCek70406
MC28U line cards can unexpectedly reload in cmts_get_dyn_transc_state.
This issue occurs when dynamic service flows are created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCek76143
DOCSIS dynamic state queue can be corrupted and cause a CMTS RP or LC
unexpected reload in cmts_get_dyn_transc_state. This is a suspected cause of
unexpected reloads in CSCek70406.
This issue occurs with dynamic service flows created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCsg13683
Dynamic Service Change (DSC) refresh messages cause out-of-order downstream
(DS) voice packets.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
163
Caveats for Cisco IOS Release 12.3 BC
Table 42
Open Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsg58537
The CLI show cable modem <mac/ip> cnr output does not have snr/cnr values.
The output shows “-----” instead of snr/cnr, even though traffic is passed through
modem.
This issue occurs in when spectrum-group is not configured on Cisco IOS Release
12.3(13a)BC or later.
Workaround: Use show cable modem <mac/ip> phy command to monitor the snr
value.
CSCsh41532
PCMM volume-based-usage exceeded should send up a gate-report-state but this is
not working as expected.
The volume-based-usage counter is supposed to be reset when a modification is
made to it on an existing gate. This should send gate-report-state after the new
value has been reached. The counter seems to be retaining the original value in a
test case.
There are no known workarounds.
CSCsh68970
Samis tries to use bpe address as source address, which result in connection failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
164
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 42
Open Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsi44396
The maximum number of virtual bundle interfaces that can be created on a CMTS
is 40. While trying to create the 41st virtual bundle interface via the CLI command,
the following error message is displayed:
Vegas-VXR(config)#int bundle 41
Exceeding maximum number of virtual bundle interfaces allowed: 40
^
% Invalid input detected at '^' marker.
Vegas-VXR(config)#
However, by using the following procedure, the CMTS allowed 41 Virtual Bundle
Interfaces. The expected result is the CMTS should not allow the 41st virtual
bundle interface to be created.
1.
Create virtual interface bundle 254 and then assign bundle254 to cable
interface 3/0 and 3/1
2.
Issue the following command hw-module slot 3 shutdown powered (This
powers down the card)
3.
Delete virtual interface bundle 254 (no interface bundle 254)
4.
Create virtual interface bundle 1-40
5.
Bring up the card that was shutdown in step 2 with no hw-module slot 3
shutdown powered
6.
You will now see 41 interface bundles.
There are no known workarounds.
CSCsi59988
Downstream prioritization on cable interfaces during cable interface congestion is
not working when the default downstream token bucket rate-limiting with shaping
scheme is in use.
Workaround: Make use of token bucket limiting without shaping.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
165
Caveats for Cisco IOS Release 12.3 BC
Table 42
Open Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsi68543
TLS is working OK right after is configured originally. If TLS is deconfigured and
then reactivated again, the corresponding Ethernet interface is not set to
promiscuous mode
Before the configuration changes:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E29
Promiscuous mode ON
After the TLS configuration was reapplied:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E28
Promiscuous mode OFF
This issue occurs with TLS configuration.
Workaround: Do not disable TLS once it is enabled.
CSCsi78768
ubr7246VXR modems that are online may not be able to be polled through the CLI
show cable modem.
The following message may be seen:
System called for common <xx>; slot <x/y>, could not send blocked IPC
message
%REQGRP-3-SYSCALL: System call for command <xx> (slotx/y)
: Could not send blocked IPC message (Cause: timeout)
-Traceback= <values omitted>
If the CMTS tries to reload the router through the CLI, a message will indicate that
it cannot reload because it is updating the startup configuration:
CMTS1#reload
Proceed with reload? [confirm]
The startup configuration is currently being updated. Try again.
This issue has been observed on 12.3(17b)BC4 & 12.3(21)BC.
Workaround: Reload the CMTS on sight.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
166
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 42
Open Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsi83966
Multiple tracebacks are observed:
313861: Apr 10 07:16:06.784 UTC: %REQGRP-3-SYSCALL: System call for
command 72 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B35B0 60C5A09C 60C5B7E0 60C58980 61005A70
610093CC 60FF9910 6101FE0C 60916AC4 60916AA8
314045: Apr 10 08:16:39.940 UTC: %REQGRP-3-SYSCALL: System call for
command 42 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606AC4A8 606AEED4 60C898A0 60C89B34 60C5AD40
60C5B188 60C5B834 60C58980 61005A70 610093CC 60FF9910 6101FE0C 60916AC4
60916AA8
313868: Apr 10 07:18:35.833 UTC: %REQGRP-3-SYSCALL: System call for
command 47 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B3D0C 606B4930 6069D1EC 6053BEC4 60886370
60897D40 60916AC4 60916AA8
This issue occurs on a UBR7246VXR with MC28U card. BPI and VPN are not
configured. No crashinfo is seen on PRE or line card.
Workaround: Reset affected line card with hardware module stop/start.
CSCsi91974
With STM1.0, the CM can be set in penalty even during Offpeak period.
This issue occurs on a uBR7200 running 12.3(17b)BC5. This issue is not seen in
12.3(13)BC.
There are no known workarounds.
CSCsj43368
IP connectivity issues or observed when running BPI.
This issue occurs when running Cisco IOS Release 12.3(21a)BC1 using MC16U.
Workaround: Downgrade to Cisco IOS Release 12.3(13a)BC6.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
167
Caveats for Cisco IOS Release 12.3 BC
Table 42
Open Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsj56573
A Cisco uBR7246VXR (UBR7200-NPE-G1) with
disk2:ubr7200-ik9su2-mz.123-17b.BC4.bin Crashed with the following:
IOS (tm) 7200 Software (UBR7200-IK9SU2-M), Version 12.3(17b)BC4,
RELEASE
SOFTWARE (fc1)
074243: Jul 1 03:41:27.042 UTC: %SYS-3-OVERRUN: Block overrun at
634F8418 (red zone 00000000)
-Traceback= 6092C0D4 6092CCE4 6092E554 6092E7A4
074244: Jul 1 03:41:27.042 UTC: %SYS-6-MTRACE: mallocfree: addr, pc
669319D4,60939814 669319D4,30000052 669319D4,60939D80
669319D4,60939814
669319D4,30000052 669319D4,60939D80 6693232C,60AD5728
66932708,60000638
074245: Jul 1 03:41:27.042 UTC: %SYS-6-MTRACE: mallocfree: addr, pc
669326A0,60AD5720 669327FC,600005BE 66932708,5000003C
669327A8,60FFA024
6693293C,6000051E 669327FC,50000062 669328E8,60FFA024
66934CD0,60000288
074246: Jul 1 03:41:27.042 UTC: %SYS-6-BLKINFO: Corrupted redzone blk
634F8418, words 131072, alloc 604FC9D4, InUse, dealloc 0, rfc
nt 1
-Traceback= 60922818 6092C0E8 6092CCE4 6092E554 6092E7A4
074247: Jul 1 03:41:27.042 UTC: %SYS-6-MEMDUMP: 0x634F8418: 0xAB1234CD
0xFFFFFFFE 0x0 0x61A5B1C0
074248: Jul 1 03:41:27.042 UTC: %SYS-6-MEMDUMP: 0x634F8428: 0x604FC9D4
0x63538440 0x634B8400 0x80020000
074249: Jul 1 03:41:27.042 UTC: %SYS-6-MEMDUMP: 0x634F8438: 0x1 0x0
0x0
0x0
%Software-forced reload
03:41:27 UTC Sun Jul 1 2007: Breakpoint exception, CPU signal 23, PC =
0x6094872C
-------------------------------------------------------------------Possible software fault. Upon reccurence, please collect
crashinfo, "show tech" and contact Cisco Technical Support.
-------------------------------------------------------------------PC Value for redzone is: cmts_bundle_mcast_init(0x604fc998)+0x3c
This issue occurs under the following conditions:
cisco uBR7246VXR (UBR7200-NPE-G1) with
ubr7200-ik9su2-mz.123-17b.BC4.bin
CRASH :
074243: Jul 1 03:41:27.042 UTC: %SYS-3-OVERRUN: Block overrun at
634F8418 (red zone 00000000)
-Traceback= 6092C0D4 6092CCE4 6092E554 6092E7A4
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
168
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 42
Open Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsj74381
A UBR that uses 127.x.x.x prefixes for internal management will include these
prefixes in its LDP/TDP address and label mapping messages. Peering routers that
have a fix for CSCdx08804 or CSCdx88897 will display error messages such as the
following:
%TAGCON-3-TDPID: peer 192.168.254.253:0, TDP Id/Addr mapping problem
(rcvd invalid address in TDP
address PIE, ignored)
%TAGCON-3-TDPID: peer 192.168.254.253:0, TDP Id/Addr mapping problem
(rcvd TDP address PIE, bind failed)
%TIB-3-REMOTETAG: 127.3.0.0/255.255.0.0, peer 192.168.254.253:0; tag 1;
add tag failure
The error messages are harmless. They indicate that the peer has advertised invalid
host/network IP addresses, and the receiving router has accordingly ignored the
associated advertisements.
There are no known workarounds.
Resolved Caveats for Release 12.3(21a)BC3
Table 43 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC3
release.
Table 43
Resolved Caveats for Cisco IOS Release 12.3(21a)BC3
DDTS ID Number
Description
CSCed95187
RST packets may contain a non-randomized identification value on the IP header.
This issue is observed on a Cisco platform that receives a TCP SYN packet on a
non-listening port.
There are no known workarounds.
CSCeh48684
Identification field is always 0 in the tacacs+ packet with SYN flag. The tacacs
packet goes from a cat6509 through a FW to the AAA server. The FW construes
this as a Fragment Overlap Attack and drops additional new connections.
There are no known workarounds.
CSCsb79076
%SYS-3-TIMERNEG errors and tracebacks are observed while making MGCP
RSVP calls on a analog (RGW) setups.
This is observed in 12.4(3.9)T1 IOS version.
There are no known workarounds.
CSCsh92986
The latency for the RSH command could increase when they are flowing through
an FWSM module.
The following issue was observed on an FWSM that is running 2.2 software: (1)
The long delay was triggered by using either Cisco IOS Release 12.3(13a)BC1 or
(2) Release 12.3(17a)BC1 on routers toward which those RSH commands were
sent.
Workaround: Either bypass the FWSM module or downgrade to Cisco IOS Release
12.3(9a)BC3, which is not affected by this extra delay issue.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
169
Caveats for Cisco IOS Release 12.3 BC
Table 43
Resolved Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsi69173
A certain sequence of upstream connector commands appears to be able to put an
upstream channel in a state where it will not come “up” until the cable line card or
CMTS is reset.
Workaround: Always ensure that before any manipulation of cable upstream
connector commands takes place, that any involved connectors are totally
disassociated from upstream channels before configurations changes occur.
CSCsi70106
In some circumstances the “Curr Resv” / Current Reservation counter for Best
Effort traffic does not decrease when modems with a reservation are moved away
from an upstream channel by dynamic load balancing.
There are no known workarounds.
CSCsi78162
A router that has the SNASwitch feature enabled may generate several of the
following messages along with tracebacks:
%DATACORRUPTION-1-DATAINCONSISTENCY: copy of xx bytes should be xx
bytes
This issue is observed on a Cisco router that runs a Cisco IOS software image that
contains the fix for caveat CSCsh87705. A list of the affected releases can be found
at: http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl
Cisco IOS software releases that are not listed in the “First Fixed-in Version” field
at this location are not affected.
There are no known workarounds.
CSCsj05744
System crash when the piggy back, fragmentation, multi grants and rate limit are
enabled on the upstream.
Workaround: As the test piggy back and multi grants are only be enabled by the test
command, and those commands are not documented in the user documents, keep
them not be used in the field.
CSCsj06951
Traceback is seen on the terminal.
This issue is seen when configuring user-locale and generating a CNF file under
telephony-service.
There are no known workarounds.
CSCsj13380
Data corruption messages may be displayed, and show isdn active may show
incorrect information for calling number on outgoing calls.
This problem is inconsistent, and shows up most frequently with the isdn test call
command.
There are no known workarounds.
CSCsj16292
Following an upgrade to 12.2(18)SXF9, the following message may be displayed:
%DATACORRUPTION-1-DATAINCONSISTENCY: copy error
-Traceback=
This message may appear as a result of SNMP polling of PAgP variables, but does
not appear to be service impacting.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
170
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 43
Resolved Caveats for Cisco IOS Release 12.3(21a)BC3 (continued)
DDTS ID Number
Description
CSCsj18014
A caller ID may be received with extra characters.
This issue is observed when caller ID is enabled on both routers and when the
station ID and station name are configured on the FXS side.
There are no known workarounds.
CSCsj26808
When trying to snmpwalk docsIfCmtsCmStatusMacAddress, the device does not
get the MAC address associated with the node.
The port the node is on is:
UBR 1 card 5
Downstream 0
Upstream 0, 1, & 2
This issue occurs during normal customer use.
Root cause of the issue is the erratic "total active devices" of
Cable5/0.
------------------ show interface Cable5/0 downstream
-----------------Cable5/0: Downstream is up
3810767406 packets output, 2447284803 bytes, 3584 discarded
0 output errors
-594 total active devices, 311 active modems
<=========== The
negtive devices counter will make the snmp code skip all entries on
C5/0.
Total downstream bandwidth: 42884 Kbps
Total downstream reserved/reservable bandwidth: 1177/38595 Kbps
Estimated usable bandwidth: 37500 Kbps
Worst case latency for low latency queue: 0 usecs
Current Upper limit for worst case latency: 0 usecs
Ranging lists counts
Maintainence list 310, max 312
Continous list 1, max 10
Pending list 0, max 3
There are no known workarounds.
CSCsj43430
DS PHS suppression does not occur on the uBR7200.
There are no known workarounds.
Open Caveats for Release 12.3(21a)BC2
Table 44 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC2
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
171
Caveats for Cisco IOS Release 12.3 BC
Table 44
Open Caveats for Cisco IOS Release 12.3(21a)BC2
DDTS ID Number
Description
CSCeh33888
A Cisco uBR7246VXR router may reload with Last reset from the watchdog reset.
This issue may occur when the router has a UBR7200-NPE-G1 processor board and
is running Cisco IOS 12.3(9a)BC.
There are no known workarounds.
CSCek70406
MC28U line cards can unexpectedly reload in cmts_get_dyn_transc_state.
This issue occurs when dynamic service flows are created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCek76143
DOCSIS dynamic state queue can be corrupted and cause a CMTS RP or LC
unexpected reload in cmts_get_dyn_transc_state. This is a suspected cause of
unexpected reloads in CSCek70406.
This issue occurs with dynamic service flows created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsh41532
PCMM volume-based-usage exceeded should send up a gate-report-state but this is
not working as expected.
The volume-based-usage counter is supposed to be reset when a modification is
made to it on an existing gate. This should send gate-report-state after the new
value has been reached. The counter seems to be retaining the original value in a
test case.
There are no known workarounds.
CSCsh68970
Samis tries to use bpe address as source address, which result in connection failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
CSCsi06219
Modems with UGS flows are moved after a while, even though the default of no
move in 123(17)BC was not changed.
There are no known workarounds.
CSCsi43840
A 28u Card resets with no unexpected reloads file being generated in bootflash.
This may occur on a router with multiple 28u cards and running Cisco IOS Release
12.3(17b)BC4.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
172
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 44
Open Caveats for Cisco IOS Release 12.3(21a)BC2 (continued)
DDTS ID Number
Description
CSCsi44396
The maximum number of virtual bundle interfaces that can be created on a CMTS
is 40. While trying to create the 41st virtual bundle interface via the CLI command,
the following error message is displayed:
Vegas-VXR(config)#int bundle 41
Exceeding maximum number of virtual bundle interfaces allowed: 40
^
% Invalid input detected at '^' marker.
Vegas-VXR(config)#
However, by using the following procedure, the CMTS allowed 41 Virtual Bundle
Interfaces. The expected result is the CMTS should not allow the 41st virtual
bundle interface to be created.
1.
Create virtual interface bundle 254 and then assign bundle254 to cable
interface 3/0 and 3/1
2.
Issue the following command hw-module slot 3 shutdown powered (This
powers down the card)
3.
Delete virtual interface bundle 254 (no interface bundle 254)
4.
Create virtual interface bundle 1-40
5.
Bring up the card that was shutdown in step 2 with no hw-module slot 3
shutdown powered
6.
You will now see 41 interface bundles.
There are no known workarounds.
CSCsi48575
A mc28u card unexpected reload is related to the pointer in the IOS related to arp
filters.
This issue occurs on a uBR7246VXR running 12.3(17b)BC4 with 28u cards.
There are no known workarounds.
CSCsi59988
Downstream prioritization on cable interfaces during cable interface congestion is
not working when the default downstream token bucket rate-limiting with shaping
scheme is in use.
Workaround: Make use of token bucket limiting without shaping.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
173
Caveats for Cisco IOS Release 12.3 BC
Table 44
Open Caveats for Cisco IOS Release 12.3(21a)BC2 (continued)
DDTS ID Number
Description
CSCsi68543
TLS is working OK right after is configured originally. If TLS is deconfigured and
then reactivated again, the corresponding Ethernet interface is not set to
promiscuous mode
Before the configuration changes:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E29
Promiscuous mode ON
After the TLS configuration was reapplied:
show run
cable l2-vpn-service dot1q
cable dot1q-vc-map <#>.<#>.<#> Ethernet<#> <#>
show controllers
Ethernet<#>
<..>
mac_adfilter_cfg = 0x0000000000000E28
Promiscuous mode OFF
This issue occurs with TLS configuration.
Workaround: Do not disable TLS once it is enabled.
CSCsi69173
A certain sequence of upstream connector commands appears to be able to put an
upstream channel in a state where it will not come “up” until the cable line card or
CMTS is reset.
Workaround: Always ensure that before any manipulation of cable upstream
connector commands takes place, that any involved connectors are totally
disassociated from upstream channels before configurations changes occur.
CSCsi78768
ubr7246VXR modems that are online may not be able to be polled through the CLI
show cable modem.
The following message may be seen:
System called for common <xx>; slot <x/y>, could not send blocked IPC
message
%REQGRP-3-SYSCALL: System call for command <xx> (slotx/y)
: Could not send blocked IPC message (Cause: timeout)
-Traceback= <values omitted>
If the CMTS tries to reload the router through the CLI, a message will indicate that
it cannot reload because it is updating the startup configuration:
CMTS1#reload
Proceed with reload? [confirm]
The startup configuration is currently being updated. Try again.
This issue has been observed on 12.3(17b)BC4 & 12.3(21)BC.
Workaround: Reload the CMTS on sight.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
174
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 44
Open Caveats for Cisco IOS Release 12.3(21a)BC2 (continued)
DDTS ID Number
Description
CSCsi83966
Multiple tracebacks are observed:
313861: Apr 10 07:16:06.784 UTC: %REQGRP-3-SYSCALL: System call for
command 72 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B35B0 60C5A09C 60C5B7E0 60C58980 61005A70
610093CC 60FF9910 6101FE0C 60916AC4 60916AA8
314045: Apr 10 08:16:39.940 UTC: %REQGRP-3-SYSCALL: System call for
command 42 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606AC4A8 606AEED4 60C898A0 60C89B34 60C5AD40
60C5B188 60C5B834 60C58980 61005A70 610093CC 60FF9910 6101FE0C 60916AC4
60916AA8
313868: Apr 10 07:18:35.833 UTC: %REQGRP-3-SYSCALL: System call for
command 47 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B3D0C 606B4930 6069D1EC 6053BEC4 60886370
60897D40 60916AC4 60916AA8
This issue occurs on a UBR7246VXR with MC28U card. BPI and VPN are not
configured. No crashinfo is seen on PRE or line card.
Workaround: Reset affected line card with hardware module stop/start.
CSCsi91974
With STM1.0, the CM can be set in penalty even during Offpeak period.
This issue occurs on a uBR7200 running 12.3(17b)BC5. This issue is not seen in
12.3(13)BC.
There are no known workarounds.
CSCsi96501
Objects from docsQosParamSetEntry are causing loop when polling the table with
snmpwalk. The RESPONSE to a GET-NEXT gives a lower index.
This issue has been seen for the objects docsQosParamSetServiceClassName and
docsQosParamSetMaxTrafficRate
This has been seen on a uBR7246VXR running Cisco IOS Software version
12.3(21)BC
There are no known workarounds.
Resolved Caveats for Release 12.3(21a)BC2
Table 45 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC2
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
175
Caveats for Cisco IOS Release 12.3 BC
Table 45
Resolved Caveats for Cisco IOS Release 12.3(21a)BC2
DDTS ID Number
Description
CSCsd81407
Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of
which is also shared with Cisco Unified Communications Manager. These
vulnerabilities pertain to the following protocols or features:
•
Session Initiation Protocol (SIP)
•
Media Gateway Control Protocol (MGCP)
•
Signaling protocols H.323, H.254
•
Real-time Transport Protocol (RTP)
•
Facsimile reception
Cisco has made free software available to address these vulnerabilities for affected
customers. Fixed Cisco IOS software listed in the Software Versions and Fixes
section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
CSCeg62070
Tracebacks or unexpected reloads are seen during a HTTP transactions with long
URLs.
The unexpected reload is seen when the length of any token in the URL of the
request is excessively long.
Workaround: Disable HTTP server using the no ip http server command.
CSCse56501
A device running Cisco IOS software that has Internet Protocol version 6 (IPv6)
enabled may be subject to a denial of service (DoS) attack. For the device to be
affected by this vulnerability the device also has to have certain Internet Protocol
version 4 (IPv4) User Datagram Protocol (UDP) services enabled. To exploit this
vulnerability an offending IPv6 packet must be targeted to the device. Packets that
are routed throughout the router can not trigger this vulnerability. Successful
exploitation will prevent the interface from receiving any additional traffic. The
only exception is Resource Reservation Protocol (RSVP) service, which if
exploited, will cause the device to crash. Only the interface on which the
vulnerability was exploited will be affected.
Cisco is providing fixed software to address this issue. There are workarounds
available to mitigate the effects of the vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
176
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 45
Resolved Caveats for Cisco IOS Release 12.3(21a)BC2 (continued)
DDTS ID Number
Description
CSCsf08998
Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of
which is also shared with Cisco Unified Communications Manager. These
vulnerabilities pertain to the following protocols or features:
•
Session Initiation Protocol (SIP)
•
Media Gateway Control Protocol (MGCP)
•
Signaling protocols H.323, H.254
•
Real-time Transport Protocol (RTP)
•
Facsimile reception
Cisco has made free software available to address these vulnerabilities for affected
customers. Fixed Cisco IOS software listed in the Software Versions and Fixes
section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
CSCsg40567
Malformed SSL packets may cause a router to leak multiple memory blocks.
This issue is observed on a Cisco router that has the ip http secure server
command enabled.
Workaround: Disable the ip http secure server command.
CSCsh14796
Under the DOCSIS1.1 or DOCSISI 2.0 model, the CMTS cannot trigger the CM to
re-send SA-MAP/TEK request unless the CM is reset or the CPE re-starts the
multicast session by IGMP-leave and IGMP-join again.
There are no known workarounds.
CSCsh59672
Cable filter groups are not correctly updated in the MC28U CLC if changes are
made in the CLI.
Specific test cases concerned the IP TOS filtering capabilities:
•
1) Cable filter group 2 is initially configured to block IP TOS 0x40.
•
2) The cable filter is then changed to filter based on IP TOS 0x20.
•
3) Show cable filter group command from CLI indicates that the changed has
been made.
•
4) Same command on the MC28U indicates that is was not changed. The
original value of 0x40 remains.
•
5) To complicate matters more, the filter group work correctly in
12.3(17b)BC4 despite the discrepancy between CLI and CLC. However, in the
upcoming 12.3(21)BC release, they do not. The filter behaves based on the
CLC config, which never updates unless the CMTS is rebooted after config
change is made.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
177
Caveats for Cisco IOS Release 12.3 BC
Table 45
Resolved Caveats for Cisco IOS Release 12.3(21a)BC2 (continued)
DDTS ID Number
Description
CSCsi01470
A vulnerability in the Cisco implementation of Multicast Virtual Private Network
(MVPN) is subject to exploitation that can allow a malicious user to create extra
multicast states on the core routers or receive multicast traffic from other
Multiprotocol Label Switching (MPLS) based Virtual Private Networks (VPN) by
sending specially crafted messages.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml.
CSCsi01961
A slow leak may occur on a UBR7200 in the CMTS MAC Parser process.
There are no known workarounds.
CSCsi17390
Certain Cable commands are unavailable underneath the cable interface:
no cable arp
no cable proxy
cable arp filters
cable dhcp-giaddr policy/primary
The IOS will not print out that the commands have been removed or a unsupported
after bootup. The commands will just be missing.
This issue occurs on a uBR7100 running 12.3(21)BC.
Workaround: Configuring sub-interfaces will allow you to configure:
no cable arp
no cable proxy
cable dhcp-giaddr policy/primary
Cable bundle interface- virtual interfaces are not supported.
CSCsi32107
During normal operations, a bus error forced reload occurs due to SNMP activity
on the router.
There are no known workarounds.
CSCsi33899
The CMTS unexpected reloads when snmp set the cdxCmtsCmQosProfile.
This issue occurs when setting the cdxCmtsCmQosProfile with boundary value
16383.
Workaround: Do not set the cdxCmtsCmQosProfile with value bigger than 255.
CSCsi41855
ubr7200 unexpected reloads when 28U card OIR/test reloads while polling
ccsFlapEntry.
This issue occurs when the OIR/LC unexpected reloads.
There are no known workarounds.
CSCsi74305
GigE promiscuous mode reset.
This issue is seen when removing and re-adding a TLS configuration.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
178
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(21a)BC1
Table 46 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC1
release.
Table 46
Open Caveats for Cisco IOS Release 12.3(21a)BC1
DDTS ID Number
Description
CSCeh33888
A Cisco uBR7246VXR router may reload with Last reset from the watchdog reset.
This issue may occur when the router has a UBR7200-NPE-G1 processor board and
is running Cisco IOS 12.3(9a)BC.
There are no known workarounds.
CSCej89390
On an ubr7200 CMTS platform with MC28U/MC16U cable line cards, if a CLC
interface has bundle slave configured, and the interface bundle slave is brought
in/out of bundle slave cfg, CMTS features like “cable source-verify dhcp” and
“cable arp” will not work properly.
There are no known workarounds.
CSCek70406
MC28U line cards can unexpectedly reload in cmts_get_dyn_transc_state.
This issue occurs when dynamic service flows are created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCsd92405
A router crashes when receiving multiple malformed Transparent LAN Service
(TLS) and/or Secure Socket Layer (SSL) 3 finished messages. A valid username
and password are not required for the crash to occur.
This issue occurs when a router has an Hypertext Transport Protocol (HTTP)
secure server enabled and has an open, unprotected HTTP port.
Workaround: There are no known workarounds. You can minimize the chances of
the condition occurring by permitting only legitimate hosts to access HTTP on the
router.
CSCse11646
Spurious memory access are produced when monitoring MAC packets with the
DSG configuration.
There are no known workarounds.
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsh14796
Under the DOCSIS1.1 or DOCSISI 2.0 model, the CMTS cannot trigger the CM to
resend SA-MAP/TEK request unless the CM is reset or the CPE re-starts the
multicast session by IGMP-leave and IGMP-join again.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
179
Caveats for Cisco IOS Release 12.3 BC
Table 46
Open Caveats for Cisco IOS Release 12.3(21a)BC1 (continued)
DDTS ID Number
Description
CSCsh41532
PCMM volume-based-usage exceeded should send up a gate-report-state but this is
not working as expected.
The volume-based-usage counter is supposed to be reset when a modification is
made to it on an existing gate. This should send gate-report-state after the new
value has been reached. The counter seems to be retaining the original value in a
test case.
There are no known workarounds.
CSCsh59672
Cable filter groups are not correctly updated in the MC28U CLC if changes are
made in the CLI.
Specific test cases concerned the IP TOS filtering capabilities:
•
1) Cable filter group 2 is initially configured to block IP TOS 0x40.
•
2) The cable filter is then changed to filter based on IP TOS 0x20.
•
3) Show cable filter group command from CLI indicates that the changed has
been made.
•
4) Same command on the MC28U indicates that is was not changed. The
original value of 0x40 remains.
•
5) To complicate matters more, the filter group work correctly in
12.3(17b)BC4 despite the discrepancy between CLI and CLC. However, in the
upcoming 12.3(21)BC release, they do not. The filter behaves based on the
CLC config, which never updates unless the CMTS is rebooted after config
change is made.
There are no known workarounds.
CSCsh68970
Samis tries to use bpe address as source address, which result in connection failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
CSCsh70337
When upgrading from 12.3(13a)BC4 to 12.3(17b)BC5, the tunnel group and tunnel
numbers are not preserved and are re-numbered starting from 1.
This issue occurs when upgrading from 12.3(13a)BC4 to 12.3(17b)BC5.
Workaround: Renumber the tunnel numbers.
CSCsh95155
Deleting snmp private RW from 10K still allows RF Switch to Toggle.
This issue occurs when using the RF switch for line card high availability, and the
private RW string is removed from the CMTS.
Workaround: Do not delete/remove the private rw snmp string from the CMTS, or
be sure to configure the same RW string on the RF S witch(s) and 10K. The
HCCP/SNMP string can be changed on the 10K with 12.3(13) code and >.
CSCsi01961
A slow leak may occur on a UBR7200 in the CMTS MAC Parser process.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
180
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Caveats for Cisco IOS Release 12.3 BC
Table 46
Open Caveats for Cisco IOS Release 12.3(21a)BC1 (continued)
DDTS ID Number
Description
CSCsi05373
A CiscoUBR7246 may unexpectedly reload due to bus error (Signal = 10, Code =
0x10) and spurious accesses may be observed.
This issue may occur under the following conditions:
•
The UBR is running Cisco IOS Release 12.3(21)BC
•
The Modems used were exclusively “Scientific Atlanta EPC2203” and have
issue to get grant from the UBR
Workaround: Do not ping or telnet to the modem while a phone call is crossing it.
CSCsi06219
Modems with UGS flows are moved after a while, even though the default of no
move in 123(17)BC was not changed.
There are no known workarounds.
Resolved Caveats for Release 12.3(21a)BC1
Table 47 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21a)BC1
release.
Table 47
Resolved Caveats for Cisco IOS Release 12.3(21a)BC1
DDTS ID Number
Description
CSCek70834
CMTS Cable Line Card (CLC) can unexpectedly reload due to a dangling pointer
reference in SID database of the CMTS on CLC. In particular, it has been seen on
a 520 CLC in a ubr10000 CMTS chassis.
No HA or multicast needs to be configured on the CMTS to see this issue.
There are no known workarounds.
CSCsd30267
The Authentication, Authorization, and Accounting (AAA) per user process is
holding memory, and the router is running out of memory.
This issue occurs on a Cisco uBR7114E router running Cisco IOS
Release 12.3(13a)BC2 with PPP over Ethernet (PPPOE) dialing and dynamic
access control lists (ACLs).
There are no known workarounds
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
181
Caveats for Cisco IOS Release 12.3 BC
Table 47
Resolved Caveats for Cisco IOS Release 12.3(21a)BC1 (continued)
DDTS ID Number
Description
CSCsd85587
A vulnerability has been discovered in a third party cryptographic library
which is used by a number of Cisco products. This vulnerability may be
triggered when a malformed Abstract Syntax Notation One (ASN.1) object is
parsed. Due to the nature of the vulnerability it may be possible, in some cases,
to trigger this vulnerability without a valid certificate or valid application-layer
credentials (such as a valid username or password).
Successful repeated exploitation of any of these vulnerabilities may lead to a
sustained Denial-of-Service (DoS); however, vulnerabilities are not known to
compromise either the confidentiality or integrity of the data or the device.
These vulnerabilities are not believed to allow an attacker will not be able to
decrypt any previously encrypted information.
The vulnerable cryptographic library is used in the following Cisco products:
– Cisco IOS, documented as Cisco bug ID CSCsd85587
– Cisco IOS XR, documented as Cisco bug ID CSCsg41084
– Cisco PIX and ASA Security Appliances, documented as Cisco bug ID
CSCse91999
– Cisco Unified CallManager, documented as Cisco bug ID CSCsg44348
– Cisco Firewall Service Module (FWSM)
This vulnerability is also being tracked by CERT/CC as VU#754281.
Cisco has made free software available to address this vulnerability for
affected customers. There are no workarounds available to mitigate the effects
of the vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-crypto.shtml.
Note
CSCse05736
Another related advisory is posted together with this Advisory. It also
describes vulnerabilities related to cryptography that affect Cisco IOS. A
combined software table for Cisco IOS only is available at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-cry-bundle.sht
ml and can be used to choose a software release which fixes all security
vulnerabilities published as of May 22, 2007. The related advisory is
published at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml.
A router running RCP can be reloaded by a specific packet.
This issue is seen under the following conditions:
•
The router must have RCP enabled.
•
The packet must come from the source address of the designated system
configured to send RCP packets to the router.
•
The packet must have a specific data content.
Workaround: Put access lists on the edge of your network blocking RCP packets to
prevent spoofed RSH packets. Use another protocol such as SCP. Use VTY ACLs.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
182
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Caveats for Cisco IOS Release 12.3 BC
Table 47
Resolved Caveats for Cisco IOS Release 12.3(21a)BC1 (continued)
DDTS ID Number
Description
CSCsg48884
When Subscriber Account Management Interface Specification (SAMIS) cable
metering is configured for streaming every 15 minutes, the Cisco uBR router
streams twice within a 15 minutes period.
This issue occurs in Cisco OS Release 12.3(17a)BC2.
There are no known workarounds.
CSCsh11476
The Cisco uBR7100 series router crashes with the following the watchdog timeout
message:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = CMTS
METERING EXPORT Process.
The issue occurs after a Subscriber Account Management Interface Specification
(SAMIS) outage. When the SAMIS server is down, the Cisco uBR router is
supposed to hold a file in flash and then send one update when the server is back
online. However, when the server came back online, the router crashed when
reading/writing a file to flash.
There are no known workarounds.
CSCsh30009
A Cisco Router running an IOS version that has contains the bug fix for
CSCsg21394 may fail to resolve Canonical Names (CNAME) DNS queries.
Router#ping http://www.google.com
Translating "http://www.google.com"...domain server (x.x.x.x)
Translating "http://www.google.com"...domain server (x.x.x.x)
Domain: Using source interface FastEthernet4
Domain: query for http://www.google.com type 1 to x.x.x.x
DOM: dom2cache: hostname is http://www.google.com, RR type=5, class=1,
ttl=0, n=8
DOM: Answer hostname doesn't match query hostnameReply received empty
Domain: query for http://www.google.com.domain.com type 1 to
x.x.x.xReply received no such name
Domain: Using source interface FastEthernet4
Domain: query for h
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
183
Caveats for Cisco IOS Release 12.3 BC
Table 47
Resolved Caveats for Cisco IOS Release 12.3(21a)BC1 (continued)
DDTS ID Number
Description
CSCsh73925
A Cisco uBR7200 or uBR10000 series CMTS may lose ip connectivity to CM/CPE
devices after removing a secondary IP address on a cable or bundle interface.
Removing a secondary ip address causes all ARP entries (associated with primary
ip address and remaining secondary ip addresses) on that bundle interface to be
deleted. Until the ARP table is rebuilt there could be loss of ip connectivity.
Workaround: Ensure that secondary IP addresses are removed during a
maintenance window.
Another potential workaround would be to segment the CMTS into smaller cable
interface bundle groups or to use separate subinterfaces so that a lower number of
modems and CPE ARP entries are linked to each subinterface.
CSCsh86171
Source verification does not work for packets received on MC28U line cards on
uBR7200 running 12.3(21)BC image.
If source verification is enabled on the bundle interface including the MC28C line
card, using cable source-verify ..., the packets are not source verified.
There are no known workarounds.
Open Caveats for Release 12.3(21)BC
Table 48 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21)BC
release.
Table 48
Open Caveats for Cisco IOS Release 12.3(21)BC
DDTS ID Number
Description
CSCeh33888
A Cisco uBR7246VXR router may reload with Last reset from the watchdog reset.
This issue may occur when the router has a UBR7200-NPE-G1 processor board and
is running Cisco IOS 12.3(9a)BC.
There are no known workarounds.
CSCej89390
On an ubr7200 CMTS platform with MC28U/MC16U cable line cards, if a CLC
interface has bundle slave configured, and the interface bundle slave is brought
in/out of bundle slave cfg, CMTS features like “cable source-verify dhcp” and
“cable arp” will not work properly.
There are no known workarounds.
CSCsd26691
When tdma-atdma docsis mode is configured on the interface, the current reserved
value shown on admission control CLI is incorrect.
This issue is observed whenever tdma-atdma is configured.
There are no known workarounds.
CSCse11646
Spurious memory access are produced when monitoring MAC packets with the
DSG configuration.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
184
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 48
Open Caveats for Cisco IOS Release 12.3(21)BC (continued)
DDTS ID Number
Description
CSCse33368
A reloaded router reloaded may display the following message:
Last reset from watchdog nmi
System was restarted by watchdog timer expired
7200 Software (UBR7200-IK9S-M), Experimental Version
12.3(20051018:202204) [kishoreg-cassatt-bc7 111]
Compiled Mon 31-Oct-05 23:27 by kishoreg
Image text-base: 0x60008E3C, data-base: 0x6172E00
There are no known workarounds.
CSCsg46637
When an invalid DSX (DSA, DSD, or DSC) message is received, only a vague
message is printed out.
There are no known workarounds.
CSCsg84570
The CMTS (UBR) may unexpectedly reload.
This issue occurs when the “interface bundleX” is used in configuration mode.
There are no known workarounds.
CSCsg84837
When IPX packets are sent to cable upstream, the ifInUnknownPkts for upstream
remains at 0.
There are no known workarounds.
CSCsh14796
Under the DOCSIS1.1 or DOCSISI 2.0 model, the CMTS cannot trigger the CM to
resend SA-MAP/TEK request unless the CM is reset or the CPE re-starts the
multicast session by IGMP-leave and IGMP-join again.
There are no known workarounds.
CSCsh40987
Under certain conditions, UBR7200 with NPE-G1 may unexpectedly reload with a
software forced reload after memory corruptions.
There are no known workarounds.
Resolved Caveats for Release 12.3(21)BC
Table 49 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(21)BC
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
185
Caveats for Cisco IOS Release 12.3 BC
Table 49
Resolved Caveats for Cisco IOS Release 12.3(21)BC
DDTS ID Number
Description
CSCed62867
After a CMTS reload, a BAD/WRONG BCM3138 FFT error message is logged.
This issue occurs with Spectrum management configuration on MC28U card.
Workaround: FFT data collection is working after the error is logged, so no manual
workaround is required.
CSCej87157
If only DS BW is saturated while there is s still US BW available, e911 calls will
be rejected.
Workaround: Stop running applications manually to free up DS BW. and turn off
automatic DS BW for preemption to occur.
CSCek43268
A QoS profile being used by a CM is able to be deleted.
There are no known workarounds.
CSCek43887
When src-ip of a cfr is edited, the tunnel stats does reset and retain the stats of the
previous flow.
There are no known workarounds.
CSCsb27648
Multiple Qos_reserve Qos_commit are seen on radius packet while intercepting
packet in packetcable.
The cmts needs to be configure for packetcable and an Gate_set needs to be receive.
There are no known workarounds.
CSCsc27292
Integrated Customer Premise Equipment (CPE) inside of certain brands of Cable
Modem and Set Top Box units are unable to acquire an IP address via a Cisco uBR
CMTS.
The issue tends to occur when cable interface bundling is configured. The issue
occurs in 12.3(13a)BC IOS but not in earlier IOS releases.
Workaround: Revert to an earlier release of IOS for the Cisco uBR CMTS or
unconfigure cable interface bundling.
CSCsc63687
When service flows are generated for multicast traffic through the use of the cable
and bundle interface command cable match address n a Cisco uBR series CMTS,
the docsQosMIBObjects SNMP objects do not report details of the multicast
service flows.
Workaround: Revert to the use of the IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc86355
When CPEs are joining and leaving multicast groups on a bundle interface at a very
fast rate, and the show interface bundle x multicast command is issued, it is
possible that an alignment error or a bus error reload may occur.
There are no known workarounds.
CSCsd30319
Modems get stuck in the init(o) state following an OIR operation if the replacement
card type is not identical to the original card.
This issue is related to virtual interface bundling and only occurs on interfaces that
are members of a cable bundle.
Workaround: Reboot the router.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
186
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 49
Resolved Caveats for Cisco IOS Release 12.3(21)BC (continued)
DDTS ID Number
Description
CSCsd39821
The VID data in entPhysicalHardwareRev MIB displays the wrong value if the data
field in EEPROM is missing.
This issue will affect the Entity MIB in all uBR7246 and uBR10000 software
releases if the VID data field is not programmed.
There are no known workarounds.
CSCsd39843
The MIBs entPhysicalSoftwareRev and entPhysicalMfgName for the
UBR7200-I/O-2FE/E controller card displays the wrong data.
This issue will affect the Entity MIB for the uBR7200 software releases.
There are no known workarounds.
CSCsd40636
The show ip vrf ? command does not display the WORD option. The show
inventory raw ? command does not display options.
There are no known workarounds.
CSCsd59963
The IP ToS/DSCP byte is always set to 0x00 for PacketCable CALEA replicated
packets, even when the original packets have a higher value.
There are no known workarounds.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should be able to
return information about all upstream bandwidth request queues on a cisco uBR
series CMTS. however, only information about the Committed Information Rate
(CIR) and the non-exist are shown.
There are no known workarounds.
CSCse06619
When changing a bundle member from one bundle to another, the service class
information is not there in show cable dsg tunnel <no> statistics CLI.
There are no known workarounds.
CSCse56676
Some of the traps may be sent to SNMP management stations, even when those
traps are not configured to be sent to those stations.
This issue can occur to any trap sent out, even when it is not associated with snmp
host.
There are no known workarounds.
CSCse77050
On a cisco uBR series CMTS, the defaults for the cable upstream <us-channel>
admission-control <percentage> command have changed from enforcing over
subscription, to 100% of the available upstream bandwidth, to not enforcing any
over subscription level.
In addition, if the command cable upstream <us-channel> admission-control
100 is configured, the command will not be properly saved and will not be
maintained after a CMTS reload.
Workaround: If upstream channel over subscription enforcement for minimum
reserved rate services is desired at 100% of upstream bandwidth, then the
workaround is to manually configure a slightly different value.
For example:
cable upstream <us-channel> admission-control 99
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
187
Caveats for Cisco IOS Release 12.3 BC
Table 49
Resolved Caveats for Cisco IOS Release 12.3(21)BC (continued)
DDTS ID Number
Description
CSCse95886
A duplicate of the following error message is seen:
This service class has not been configured yet.
This issue occurs when the no cable admission-control us-bandwidth
service-class <name> CLE is used when is no service class existing by name
<name>.
There are no known workarounds.
CSCsf04754
Multiple Cisco products contain either of two authentication vulnerabilities in the
Simple Network Management Protocol version 3 (SNMPv3) feature. These
vulnerabilities can be exploited when processing a malformed SNMPv3 message.
These vulnerabilities could allow the disclosure of network information or may
enable an attacker to perform configuration changes to vulnerable devices. The
SNMP server is an optional service that is disabled by default. Only SNMPv3 is
impacted by these vulnerabilities. Workarounds are available for mitigating the
impact of the vulnerabilities described in this document.
The United States Computer Emergency Response Team (US-CERT) has assigned
Vulnerability Note VU#878044 to these vulnerabilities.
Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-0960 has been
assigned to these vulnerabilities.
This advisory will be posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080610-snmpv3.shtml
CSCek57932
Cisco uBR10012 series devices automatically enable Simple Network
Management Protocol (SNMP) read/write access to the device if configured for
linecard redundancy. This can be exploited by an attacker to gain complete control
of the device. Only Cisco uBR10012 series devices that are configured for linecard
redundancy are affected.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml.
Open Caveats for Release 12.3(17b)BC9
Table 50 lists only severity 1 and 2 caveats and select severity 3 caveats for Cisco IOS Release
12.3(17b)BC9.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
188
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 50
Open Caveats for Cisco IOS Release 12.3(17b)BC9
DDTS ID Number
Description
CSCed62867
After a CMTS reload, a BAD/WRONG BCM3138 FFT error message is logged.
This issue occurs with Spectrum management configuration on MC28U card.
Workaround: FFT data collection is working after the error is logged, so no manual
workaround is required.
CSCej87157
All e911 calls are rejected if downstream (DS) bandwidth is saturated, even though
upstream (US) bandwidth is still available.
Workaround: Stop running applications manually to free up DS bandwidth; no
automatic DS bandwidth preemption occurs.
CSCek43268
You can now delete a quality of service (QoS) profile that is being used by a cable
modem.
CSCek43887
When the src-ip field of a Confirmation to Receive (CFR) is edited, the tunnel
statistics do not get reset and retain the statistics of the previous flow.
There are no known workarounds.
CSCek70406
MC28U line cards can unexpectedly reload in cmts_get_dyn_transc_state.
This issue occurs when dynamic service flows are created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsb27648
Multiple Qos_reserve Qos_commits occur on a RADIUS packet while intercepting
packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc86355
When customer premises equipment (CPE) devices are joining and leaving
multicast groups on a bundle interface at a very fast rate, and the show interface
bundle x multicast command is issued, an alignment error or a bus error reload
occurs.
There are no known workarounds.
CSCsd39821
The VID data in the entPhysicalHardwareRev MIB displays the wrong value if the
data field in EEPROM is missing.
This issue affects the Entity MIB in all Cisco uBR7100 software releases if the VID
data field is not programmed.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
189
Caveats for Cisco IOS Release 12.3 BC
Table 50
Open Caveats for Cisco IOS Release 12.3(17b)BC9 (continued)
DDTS ID Number
Description
CSCsd39843
The entPhysicalSoftwareRev and entPhysicalMfgName MIBs for the
Cisco uBR7100-I/O-2FE/E controller card display the wrong data.
This issue affects the Entity MIB for the Cisco uBR7100 software releases
There are no known workarounds.
CSCsd40636
The show ip vrf ? command does not display the WORD option, and the show
inventory raw ? does not display options at all.
There are no known workarounds.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should return
information about all upstream bandwidth request queues on a Cisco uBR series
cable modem termination system (CMTS). However, only information about the
Committed Information Rate (CIR) and the existent Tiered Best Effort (TBE)
queue is available.
There are no known workarounds.
CSCsd84554
The not in service quality of service (QoS) profile can be enforced to the modem
using the cdxCmtsCmQosProfile MIB, but the not in service QoS profile cannot be
enforced to the modem using the CLI.
There are no known workarounds.
CSCse06619
When changing a bundle member from one bundle to another, the service class
information is not displayed in the show cable dsg tunnel no statistics command.
There are no known workarounds.
CSCse14247
The cable quality of service (QoS) profile that is created using the
cdxCmtsCmQosProfile MIB can be modified or deleted when the profile is active
and in use by modems.
There are no known workarounds.
CSCse77050
On a Cisco uBR series cable modem termination system (CMTS), the defaults for
the cable upstream us-channel admission-control percentage command have
changed from enforcing over subscription to 100% of the available upstream
bandwidth, to not enforcing any over subscription level. In addition, if the cable
upstream us-channel admission-control 100 command is configured, the
command is not properly saved and is not maintained after a CMTS reload.
Workaround: If upstream channel over subscription enforcement for minimum
reserved rate services is desired at 100% of upstream bandwidth, then manually
configure a slightly different value. For example: cable upstream us-channel
admission-control 99.
CSCse95886
When you use the no cable admission-control us-bandwidth service-class name
command to disable Admission Control upstream bandwidth for a non-existing
service class, duplicate error messages are generated stating:
This service class has not been configured yet.
There are no known workarounds.
CSCsg13683
Dynamic Service Change (DSC) refresh messages cause out-of-order downstream
(DS) voice packets.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
190
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 50
Open Caveats for Cisco IOS Release 12.3(17b)BC9 (continued)
DDTS ID Number
Description
CSCsh59672
Cable filter groups are not correctly updated in the MC28U cable line card if
changes are made in the command line interface (CLI).
Specific test cases concerned the IP TOS filtering capabilities:
•
Cable filter group 2 is initially configured to block IP TOS 0x40.
•
The cable filter is then changed to filter based on IP TOS 0x20.
•
Show cable filter group command from CLI indicates that the changed has
been made.
•
Same command on the MC28U indicates that is was not changed. The original
value of 0x40 remains.
•
To complicate matters more, the filter group work correctly in Cisco IOS
Release 12.3(17b)BC4 despite the discrepancy between CLI and CLC.
However, in the upcoming Cisco IOS Release 12.3(21)BC release, they do not.
The filter behaves based on the CLC configuration, which never updates unless
the cable modem termination system (CMTS) is rebooted after a configuration
change is made.
There are no known workarounds.
CSCsi83966
Multiple tracebacks are observed:
313861: Apr 10 07:16:06.784 UTC: %REQGRP-3-SYSCALL: System call for
command 72 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B35B0 60C5A09C 60C5B7E0 60C58980 61005A70
610093CC 60FF9910 6101FE0C 60916AC4 60916AA8
314045: Apr 10 08:16:39.940 UTC: %REQGRP-3-SYSCALL: System call for
command 42 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606AC4A8 606AEED4 60C898A0 60C89B34 60C5AD40
60C5B188 60C5B834 60C58980 61005A70 610093CC 60FF9910 6101FE0C 60916AC4
60916AA8
313868: Apr 10 07:18:35.833 UTC: %REQGRP-3-SYSCALL: System call for
command 47 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B3D0C 606B4930 6069D1EC 6053BEC4 60886370
60897D40 60916AC4 60916AA8
This issue occurs on a Cisco uBR7246VXR router with an MC28U card. BPI and
VPN are not configured. No crashinfo is seen on PRE or line card.
Workaround: Reset affected line card with hardware module stop/start.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
191
Caveats for Cisco IOS Release 12.3 BC
Table 50
Open Caveats for Cisco IOS Release 12.3(17b)BC9 (continued)
DDTS ID Number
Description
CSCsj26808
When trying to snmpwalk docsIfCmtsCmStatusMacAddress, the device does not
get the MAC address associated with the node.
The port the node is on is:
UBR 1 card 5
Downstream 0
Upstream 0, 1, & 2
This issue occurs during normal customer use.
Root cause of the issue is the erratic "total active devices" of
Cable5/0.
------------------ show interface Cable5/0 downstream
-----------------Cable5/0: Downstream is up
3810767406 packets output, 2447284803 bytes, 3584 discarded
0 output errors
-594 total active devices, 311 active modems
<=========== The
negtive devices counter will make the snmp code skip all entries on
C5/0.
Total downstream bandwidth: 42884 Kbps
Total downstream reserved/reservable bandwidth: 1177/38595 Kbps
Estimated usable bandwidth: 37500 Kbps
Worst case latency for low latency queue: 0 usecs
Current Upper limit for worst case latency: 0 usecs
Ranging lists counts
Maintainence list 310, max 312
Continous list 1, max 10
Pending list 0, max 3
There are no known workarounds.
CSCsj81080
Two Cisco uBR7246VXR routers with NPE-G1s both show negative input queue
values on the cable interface. The two routers are passing traffic. The bundled
virtual interfaces on the devices have a non-decreasing positive input queue.
Workaround: The negative input queue values issue is cosmetic; the interface still
passes traffic. The continuously growing input queue on the bundled interface can
be cleared by reloading the device.
CSCsj93719
A Cisco uBR7246VXR router with an NPE-G1 reboots. The system returns to
ROM with the following error:
Software forced crash, PC 0x6094918C
The crash occurs because the redzone is overwritten in the I/O memory pool.
There are no known workarounds.
CSCsk17493
A slow memory leak exists in Request di and SNMP ENGINE.
This issue occurs on a router running Cisco IOS Release 12.3(17b)BC4 and the
Simple Network Management Protocol (SNMP).
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
192
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 50
Open Caveats for Cisco IOS Release 12.3(17b)BC9 (continued)
DDTS ID Number
Description
CSCsk49540
A line card memory allocation failure is causing a system slowdown. The show
cable modem, show run, and show tech commands all experience noticeable
performance slowdowns.
This issue occurs because a cable line card is running out of memory; Pool Manager
Free shows as 0, and holdong shows a large value.
There are no known workarounds.
CSCsk60162
Voice assigned to an Unsolicited Grant Services (UGS) flow is not seen on the
sniffer, intercepted packet.
This issue occurs sporadically on an MC28X card.
Workaround: Execute a shut/no shut of the cable interface
Resolved Caveats for Release 12.3(17b)BC9
Table 51 lists only severity 1 and 2 caveats and select severity 3 caveats for Cisco IOS
Release 12.3(17b)BC9.
Table 51
Resolved Caveats for Cisco IOS Release 12.3(17b)BC9
DDTS ID Number
Description
CSCed95187
RST packets may contain a non-randomized identification value on the IP header.
This issue is observed on a Cisco platform that receives a TCP SYN packet on a
non-listening port.
There are no known workarounds.
CSCeh48684
Identification field is always 0 in the tacacs+ packet with SYN flag. The tacacs
packet goes from a cat6509 through a FW to the AAA server. The FW construes
this as a Fragment Overlap Attack and drops additional new connections.
There are no known workarounds.
CSCsh92986
The latency for the RSH command could increase when they are flowing through
an FWSM module.
The following issue was observed on an FWSM that is running 2.2 software: (1)
The long delay was triggered by using either Cisco IOS Release 12.3(13a)BC1 or
(2) Cisco IOS Release 12.3(17a)BC1 on routers toward which those RSH
commands were sent.
Workaround: Either bypass the FWSM module or downgrade to Cisco IOS
Release 12.3(9a)BC3, which is not affected by this extra delay issue.
CSCsi91974
With STM1.0, the cable modem can be set in penalty even during Offpeak period.
This issue occurs on a Cisco router running Cisco IOS Release 12.3(17b)BC5. This
issue is not seen in Cisco IOS Release 12.3(13)BC.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
193
Caveats for Cisco IOS Release 12.3 BC
Table 51
Resolved Caveats for Cisco IOS Release 12.3(17b)BC9 (continued)
DDTS ID Number
Description
CSCsj16292
Following an upgrade to Cisco IOS Release 12.2(18)SXF9, the following message
may be displayed:
%DATACORRUPTION-1-DATAINCONSISTENCY: copy error
-Traceback=
This message may appear as a result of Simple Network Management Protocol
(SNMP) polling of PAgP variables, but does not appear to be service impacting.
There are no known workarounds.
CSCsj18014
A caller ID may be received with extra characters.
This issue is observed when caller ID is enabled on both routers and when the
station ID and station name are configured on the FXS side.
There are no known workarounds.
CSCsj43368
IP connectivity issues or observed when running Baseline Privacy Interface (BPI).
This issue occurs when running Cisco IOS Release 12.3(21a)BC1 using an MC16U
card.
Workaround: Downgrade to Cisco IOS Release 12.3(13a)BC6.
CSCsj52927
DATACORRUPTION-1-DATAINCONSISTENCY messages appear in the show
log output when the router comes up.
There are no known workarounds.
Open Caveats for Release 12.3(17b)BC8
Table 52 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC8
release.
Table 52
Open Caveats for Cisco OS Release 12.3(17b)BC8
DDTS ID Number
Description
CSCed62867
After a cable modem termination system (CMTS) reload, the following error
message is logged:
BAD/WRONG BCM3138 FFT
This issue occurs when there is a spectrum management configuration on an
MC28U card.
Workaround: No manual workaround is required; Fast Fourier Transform (FFT)
data collection continues working after the error is logged.
CSCeh33888
A Cisco uBR7100 series router reloads with the last reset from the watchdog reset.
This issue occurs on a router that has an NPE-G1 processor board and is running
Cisco IOS Release 12.3(9a)BC.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
194
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 52
Open Caveats for Cisco OS Release 12.3(17b)BC8 (continued)
DDTS ID Number
Description
CSCej87157
All e911 calls are rejected if downstream (DS) bandwidth is saturated, even though
upstream (US) bandwidth is still available.
Workaround: Stop running applications manually to free up DS bandwidth; no
automatic DS bandwidth preemption occurs.
CSCek43268
You can now delete a quality of service (QoS) profile that is being used by a cable
modem.
CSCek43887
When the src-ip field of a Confirmation to Receive (CFR) is edited, the tunnel
statistics do not get reset and retain the statistics of the previous flow.
There are no known workarounds.
CSCek70406
MC28U line cards can unexpectedly reload in cmts_get_dyn_transc_state.
This issue occurs when dynamic service flows are created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsb27648
Multiple Qos_reserve Qos_commits occur on a RADIUS packet while intercepting
packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc86355
When customer premises equipment (CPE) devices are joining and leaving
multicast groups on a bundle interface at a very fast rate, and the show interface
bundle x multicast command is issued, an alignment error or a bus error reload
occurs.
There are no known workarounds.
CSCsd39821
The VID data in the entPhysicalHardwareRev MIB displays the wrong value if the
data field in EEPROM is missing.
This issue affects the Entity MIB in all Cisco uBR7100 software releases if the VID
data field is not programmed.
There are no known workarounds.
CSCsd39843
The entPhysicalSoftwareRev and entPhysicalMfgName MIBs for the
Cisco uBR7100-I/O-2FE/E controller card display the wrong data.
This issue affects the Entity MIB for the Cisco uBR7100 software releases
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
195
Caveats for Cisco IOS Release 12.3 BC
Table 52
Open Caveats for Cisco OS Release 12.3(17b)BC8 (continued)
DDTS ID Number
Description
CSCsd40636
The show ip vrf ? command does not display the WORD option, and the show
inventory raw ? does not display options at all.
There are no known workarounds.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should return
information about all upstream bandwidth request queues on a Cisco uBR series
cable modem termination system (CMTS). However, only information about the
Committed Information Rate (CIR) and the existent Tiered Best Effort (TBE)
queue is available.
There are no known workarounds.
CSCsd84554
The not in service quality of service (QoS) profile can be enforced to the modem
using the cdxCmtsCmQosProfile MIB, but the not in service QoS profile cannot be
enforced to the modem using the CLI.
There are no known workarounds.
CSCse06619
When changing a bundle member from one bundle to another, the service class
information is not displayed in the show cable dsg tunnel no statistics command.
There are no known workarounds.
CSCse14247
The cable quality of service (QoS) profile that is created using the
cdxCmtsCmQosProfile MIB can be modified or deleted when the profile is active
and in use by modems.
There are no known workarounds.
CSCse77050
On a Cisco uBR series cable modem termination system (CMTS), the defaults for
the cable upstream us-channel admission-control percentage command have
changed from enforcing over subscription to 100% of the available upstream
bandwidth, to not enforcing any over subscription level. In addition, if the cable
upstream us-channel admission-control 100 command is configured, the
command is not properly saved and is not maintained after a CMTS reload.
Workaround: If upstream channel over subscription enforcement for minimum
reserved rate services is desired at 100% of upstream bandwidth, then manually
configure a slightly different value. For example: cable upstream us-channel
admission-control 99.
CSCse95886
When you use the no cable admission-control us-bandwidth service-class name
command to disable Admission Control upstream bandwidth for a non-existing
service class, duplicate error messages are generated stating:
This service class has not been configured yet.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
196
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 52
Open Caveats for Cisco OS Release 12.3(17b)BC8 (continued)
DDTS ID Number
Description
CSCsh59672
Cable filter groups are not correctly updated in the MC28U CLC if changes are
made in the CLI.
Specific test cases concerned the IP TOS filtering capabilities:
•
1) Cable filter group 2 is initially configured to block IP TOS 0x40.
•
2) The cable filter is then changed to filter based on IP TOS 0x20.
•
3) Show cable filter group command from CLI indicates that the changed has
been made.
•
4) Same command on the MC28U indicates that is was not changed. The
original value of 0x40 remains.
•
5) To complicate matters more, the filter group work correctly in
12.3(17b)BC4 despite the discrepancy between CLI and CLC. However, in the
upcoming 12.3(21)BC release, they do not. The filter behaves based on the
CLC config, which never updates unless the CMTS is rebooted after config
change is made.
There are no known workarounds.
CSCsi06219
Modems with UGS flows are moved after a while, even though the default of no
move in 123(17)BC was not changed.
There are no known workarounds.
CSCsi48575
A mc28u card unexpected reload is related to the pointer in the IOS related to arp
filters.
This issue occurs on a uBR7246VXR running 12.3(17b)BC4 with 28u cards.
There are no known workarounds.
CSCsi83966
Multiple tracebacks are observed:
313861: Apr 10 07:16:06.784 UTC: %REQGRP-3-SYSCALL: System call for
command 72 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B35B0 60C5A09C 60C5B7E0 60C58980 61005A70
610093CC 60FF9910 6101FE0C 60916AC4 60916AA8
314045: Apr 10 08:16:39.940 UTC: %REQGRP-3-SYSCALL: System call for
command 42 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606AC4A8 606AEED4 60C898A0 60C89B34 60C5AD40
60C5B188 60C5B834 60C58980 61005A70 610093CC 60FF9910 6101FE0C 60916AC4
60916AA8
313868: Apr 10 07:18:35.833 UTC: %REQGRP-3-SYSCALL: System call for
command 47 (slot4/0) : Could not send blocked IPC message (Cause:
timeout)
-Traceback= 6069F510 606B3D0C 606B4930 6069D1EC 6053BEC4 60886370
60897D40 60916AC4 60916AA8
This issue occurs on a UBR7246VXR with MC28U card. BPI and VPN are not
configured. No crashinfo is seen on PRE or line card.
Workaround: Reset affected line card with hardware module stop/start.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
197
Caveats for Cisco IOS Release 12.3 BC
Table 52
Open Caveats for Cisco OS Release 12.3(17b)BC8 (continued)
DDTS ID Number
Description
CSCsi91974
With STM1.0, the CM can be set in penalty even during Offpeak period.
This issue occurs on a uBR7200 running 12.3(17b)BC5. This issue is not seen in
12.3(13)BC.
There are no known workarounds.
CSCsj26808
When trying to snmpwalk docsIfCmtsCmStatusMacAddress, the device does not
get the MAC address associated with the node.
The port the node is on is:
UBR 1 card 5
Downstream 0
Upstream 0, 1, & 2
This issue occurs during normal customer use.
Root cause of the issue is the erratic "total active devices" of
Cable5/0.
------------------ show interface Cable5/0 downstream
-----------------Cable5/0: Downstream is up
3810767406 packets output, 2447284803 bytes, 3584 discarded
0 output errors
-594 total active devices, 311 active modems
<=========== The
negtive devices counter will make the snmp code skip all entries on
C5/0.
Total downstream bandwidth: 42884 Kbps
Total downstream reserved/reservable bandwidth: 1177/38595 Kbps
Estimated usable bandwidth: 37500 Kbps
Worst case latency for low latency queue: 0 usecs
Current Upper limit for worst case latency: 0 usecs
Ranging lists counts
Maintainence list 310, max 312
Continous list 1, max 10
Pending list 0, max 3
There are no known workarounds.
Resolved Caveats for Release 12.3(17b)BC8
Table 53 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC8
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
198
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 53
Resolved Caveats for Cisco OS Release 12.3(17b)BC8
DDTS ID Number
Description
CSCeg62070
Tracebacks or unexpected reloads are seen during a HTTP transactions with long
URLs.
The unexpected reload is seen when the length of any token in the URL of the
request is excessively long.
Workaround: Disable HTTP server using the no ip http server command.
CSCek76143
DOCSIS dynamic state queue can be corrupted and cause a CMTS RP or LC
unexpected reload in cmts_get_dyn_transc_state. This is a suspected cause of
unexpected reloads in CSCek70406.
This issue occurs with dynamic service flows created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsb79076
%SYS-3-TIMERNEG errors and tracebacks are observed while making MGCP
RSVP calls on a analog (RGW) setups.
This is observed in 12.4(3.9)T1 IOS version.
There are no known workarounds.
CSCsd59963
The IP ToS/DSCP byte is always set to 0x00 for PacketCable CALEA replicated
packets, even when original packets have a higher value.
There are no known workarounds.
CSCse56501
A device running Cisco IOS software that has Internet Protocol version 6 (IPv6)
enabled may be subject to a denial of service (DoS) attack. For the device to be
affected by this vulnerability the device also has to have certain Internet Protocol
version 4 (IPv4) User Datagram Protocol (UDP) services enabled. To exploit this
vulnerability an offending IPv6 packet must be targeted to the device. Packets that
are routed throughout the router can not trigger this vulnerability. Successful
exploitation will prevent the interface from receiving any additional traffic. The
only exception is Resource Reservation Protocol (RSVP) service, which if
exploited, will cause the device to crash. Only the interface on which the
vulnerability was exploited will be affected.
Cisco is providing fixed software to address this issue. There are workarounds
available to mitigate the effects of the vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml.
CSCsg40567
Malformed SSL packets may cause a router to leak multiple memory blocks.
This issue is observed on a Cisco router that has the ip http secure server
command enabled.
Workaround: Disable the ip http secure server command.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
199
Caveats for Cisco IOS Release 12.3 BC
Table 53
Resolved Caveats for Cisco OS Release 12.3(17b)BC8 (continued)
DDTS ID Number
Description
CSCsi01470
A vulnerability in the Cisco implementation of Multicast Virtual Private Network
(MVPN) is subject to exploitation that can allow a malicious user to create extra
multicast states on the core routers or receive multicast traffic from other
Multiprotocol Label Switching (MPLS) based Virtual Private Networks (VPN) by
sending specially crafted messages.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml.
CSCsi01961
A slow leak may occur on a UBR7200 in the CMTS MAC Parser process.
There are no known workarounds.
CSCsi32107
During normal operations, a bus error forced reload occurs due to SNMP activity
on the router.
There are no known workarounds.
CSCsi33899
The CMTS unexpected reloads when snmp set the cdxCmtsCmQosProfile.
This issue occurs when setting the cdxCmtsCmQosProfile with boundary value
16383.
Workaround: Do not set the cdxCmtsCmQosProfile with value bigger than 255.
CSCsi41855
ubr7200 unexpected reloads when 28U card OIR/test reloads while polling
ccsFlapEntry.
This issue occurs when the OIR/LC unexpected reloads.
There are no known workarounds.
CSCsj18516
CMTS does not allow more than 8 downstream service flows with PHS enabled for
a single modem.
There are no known workarounds.
CSCek57932
Cisco uBR10012 series devices automatically enable Simple Network
Management Protocol (SNMP) read/write access to the device if configured for
linecard redundancy. This can be exploited by an attacker to gain complete control
of the device. Only Cisco uBR10012 series devices that are configured for linecard
redundancy are affected.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml.
Open Caveats for Release 12.3(17b)BC7
Table 54 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC7
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
200
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 54
Open Caveats for Cisco OS Release 12.3(17b)BC7
DDTS ID Number
Description
CSCek70406
MC28U line cards can unexpectedly reload in cmts_get_dyn_transc_state.
This issue occurs when dynamic service flows are created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tmda-atmda docsis mode is configured on the interface, the current reserved
value shown on the admission control command is incorrect.
This issue occurs whenever tdma-atdma mode is configured.
There are no known workarounds.
CSCse11646
Spurious memory access occurs when monitoring MAC packets with the DOCSIS
Set-Top Gateway (DSG) configuration.
There are no known workarounds.
CSCsg46637
When an invalid DSX (Dynamic Service Addition (DSA), Dynamic Service
Deletion (DSD), or Dynamic Service Change (DSC) message is received, only a
vague message is printed out.
There are no known workarounds.
CSCsh14796
Under the DOCSIS1.1 or DOCSISI 2.0 model, the CMTS cannot trigger the CM to
re-send SA-MAP/TEK request unless the CM is reset or the CPE re-starts the
multicast session by IGMP-leave and IGMP-join again.
There are no known workarounds.
CSCsh59672
Cable filter groups are not correctly updated in the MC28U CLC if changes are
made in the CLI.
Specific test cases concerned the IP TOS filtering capabilities:
•
1) Cable filter group 2 is initially configured to block IP TOS 0x40.
•
2) The cable filter is then changed to filter based on IP TOS 0x20.
•
3) Show cable filter group command from CLI indicates that the changed has
been made.
•
4) Same command on the MC28U indicates that is was not changed. The
original value of 0x40 remains.
•
5) To complicate matters more, the filter group work correctly in
12.3(17b)BC4 despite the discrepancy between CLI and CLC. However, in the
upcoming 12.3(21)BC release, they do not. The filter behaves based on the
CLC config, which never updates unless the CMTS is rebooted after config
change is made.
There are no known workarounds.
CSCsh68970
Samis tries to use bpe address as source address, which result in connection failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
201
Caveats for Cisco IOS Release 12.3 BC
Table 54
Open Caveats for Cisco OS Release 12.3(17b)BC7 (continued)
DDTS ID Number
Description
CSCsh70337
When upgrading from 12.3(13a)BC4 to 12.3(17b)BC5, the tunnel group and tunnel
numbers are not preserved and are re-numbered starting from 1.
This issue occurs when upgrading from 12.3(13a)BC4 to 12.3(17b)BC5.
Workaround: Renumber the tunnel numbers.
CSCsh86171
Source verification does not work for packets received on MC28U line cards on
uBR7200 running 12.3(21)BC image.
If source verification is enabled on the bundle interface including the MC28C line
card, using cable source-verify ..., the packets are not source verified.
There are no known workarounds.
CSCsi06219
Modems with UGS flows are moved after a while, even though the default of no
move in 123(17)BC was not changed.
There are no known workarounds.
CSCsi32107
During normal operations, a bus error forced reload occurs due to SNMP activity
on the router.
There are no known workarounds.
Resolved Caveats for Release 12.3(17b)BC7
Table 55 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC7
release.
Table 55
Resolved Caveats for Cisco OS Release 12.3(17b)BC7
DDTS ID Number
Description
CSCsd81407
Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of
which is also shared with Cisco Unified Communications Manager. These
vulnerabilities pertain to the following protocols or features:
•
Session Initiation Protocol (SIP)
•
Media Gateway Control Protocol (MGCP)
•
Signaling protocols H.323, H.254
•
Real-time Transport Protocol (RTP)
•
Facsimile reception
Cisco has made free software available to address these vulnerabilities for affected
customers. Fixed Cisco IOS software listed in the Software Versions and Fixes
section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
202
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(17b)BC6
Table 56 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC6
release.
Table 56
Open Caveats for Cisco OS Release 12.3(17b)BC6
DDTS ID Number
Description
CSCek70406
MC28U line cards can unexpectedly reload in cmts_get_dyn_transc_state.
This issue occurs when dynamic service flows are created in packetcable or
non-packetcable environment.
There are no known workarounds.
CSCsd26691
When tmda-atmda docsis mode is configured on the interface, the current reserved
value shown on the admission control command is incorrect.
This issue occurs whenever tdma-atdma mode is configured.
There are no known workarounds.
CSCse11646
Spurious memory access occurs when monitoring MAC packets with the DOCSIS
Set-Top Gateway (DSG) configuration.
There are no known workarounds.
CSCsg46637
When an invalid DSX (Dynamic Service Addition (DSA), Dynamic Service
Deletion (DSD), or Dynamic Service Change (DSC) message is received, only a
vague message is printed out.
There are no known workarounds.
CSCsh14796
Under the DOCSIS1.1 or DOCSISI 2.0 model, the CMTS cannot trigger the CM to
re-send SA-MAP/TEK request unless the CM is reset or the CPE re-starts the
multicast session by IGMP-leave and IGMP-join again.
There are no known workarounds.
CSCsh59672
Cable filter groups are not correctly updated in the MC28U CLC if changes are
made in the CLI.
Specific test cases concerned the IP TOS filtering capabilities:
•
1) Cable filter group 2 is initially configured to block IP TOS 0x40.
•
2) The cable filter is then changed to filter based on IP TOS 0x20.
•
3) Show cable filter group command from CLI indicates that the changed has
been made.
•
4) Same command on the MC28U indicates that is was not changed. The
original value of 0x40 remains.
•
5) To complicate matters more, the filter group work correctly in
12.3(17b)BC4 despite the discrepancy between CLI and CLC. However, in the
upcoming 12.3(21)BC release, they do not. The filter behaves based on the
CLC config, which never updates unless the CMTS is rebooted after config
change is made.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
203
Caveats for Cisco IOS Release 12.3 BC
Table 56
Open Caveats for Cisco OS Release 12.3(17b)BC6 (continued)
DDTS ID Number
Description
CSCsh68970
Samis tries to use bpe address as source address, which result in connection failure.
Neither cable metering source-interface configured, nor loopback interface
available; moreover, the bpe address is the highest ip address among the interfaces.
Workaround: Set up the source interface via CLI cable metering source-interface.
CSCsh70337
When upgrading from 12.3(13a)BC4 to 12.3(17b)BC5, the tunnel group and tunnel
numbers are not preserved and are re-numbered starting from 1.
This issue occurs when upgrading from 12.3(13a)BC4 to 12.3(17b)BC5.
Workaround: Renumber the tunnel numbers.
CSCsh86171
Source verification does not work for packets received on MC28U line cards on
uBR7200 running 12.3(21)BC image.
If source verification is enabled on the bundle interface including the MC28C line
card, using cable source-verify ..., the packets are not source verified.
There are no known workarounds.
CSCsi06219
Modems with UGS flows are moved after a while, even though the default of no
move in 123(17)BC was not changed.
There are no known workarounds.
CSCsi32107
During normal operations, a bus error forced reload occurs due to SNMP activity
on the router.
There are no known workarounds.
Resolved Caveats for Release 12.3(17b)BC6
Table 57 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC6
release.
Table 57
Resolved Caveats for Cisco OS Release 12.3(17b)BC6
DDTS ID Number
Description
CSCek70834
CMTS Cable Line Card (CLC) can unexpectedly reload due to a dangling pointer
reference in SID database of the CMTS on CLC. In particular, it has been seen on
a 520 CLC in a ubr10000 CMTS chassis.
No HA or multicast needs to be configured on the CMTS to see this issue.
There are no known workarounds.
CSCsd30267
The Authentication, Authorization, and Accounting (AAA) per user process is
holding memory, and the router is running out of memory.
This issue occurs on a Cisco uBR7114E router running Cisco IOS
Release 12.3(13a)BC2 with PPP over Ethernet (PPPOE) dialing and dynamic
access control lists (ACLs).
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
204
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 57
Resolved Caveats for Cisco OS Release 12.3(17b)BC6 (continued)
DDTS ID Number
Description
CSCsd85587
A vulnerability has been discovered in a third party cryptographic library which is
used by a number of Cisco products. This vulnerability may be triggered when a
malformed Abstract Syntax Notation One (ASN.1) object is parsed. Due to the
nature of the vulnerability it may be possible, in some cases, to trigger this
vulnerability without a valid certificate or valid application-layer credentials (such
as a valid username or password).
Successful repeated exploitation of any of these vulnerabilities may lead to a
sustained Denial-of-Service (DoS); however, vulnerabilities are not known to
compromise either the confidentiality or integrity of the data or the device. These
vulnerabilities are not believed to allow an attacker will not be able to decrypt any
previously encrypted information.
The vulnerable cryptographic library is used in the following Cisco products:
Cisco IOS, documented as Cisco bug ID CSCsd85587
Cisco IOS XR, documented as Cisco bug ID CSCsg41084
Cisco PIX and ASA Security Appliances, documented as Cisco bug ID
CSCse91999
Cisco Unified CallManager, documented as Cisco bug ID CSCsg44348
Cisco Firewall Service Module (FWSM)
This vulnerability is also being tracked by CERT/CC as VU#754281.
Cisco has made free software available to address this vulnerability for affected
customers. There are no workarounds available to mitigate the effects of the
vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-crypto.shtml.
Note
Another related advisory is posted together with this Advisory. It also
describes vulnerabilities related to cryptography that affect Cisco IOS. A
combined software table for Cisco IOS only is available at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-cry-bundle.sht
ml and can be used to choose a software release which fixes all security
vulnerabilities published as of May 22, 2007. The related advisory is
published at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
205
Caveats for Cisco IOS Release 12.3 BC
Table 57
Resolved Caveats for Cisco OS Release 12.3(17b)BC6 (continued)
DDTS ID Number
Description
CSCse04560
A tftp client trying to transfer a file from a Cisco IOS device configured as a tftp
server and which is denied by an ACL receives a different result depending if the
file is being offered for download or not. This may allow a third party to enumerate
which files are available for download.
The tftp-server command is configured on the device and an ACL restricting
access to the file in question has been applied as in this example:
tftp-server flash: filename1 access-list-number
access-list access-list-number
permit 192.168.1.0 0.0.0.255
access-list access-list-number
deny any
Workaround: The following workarounds can be applied:
1. Interface ACL
Configure and attach an access list to every router interface active and configured
for IP packet processing. Once the tftp server in Cisco IOS is enabled and listening
by default on all interfaces enabled for IP processing, the access list would need to
deny traffic to each and every IP address assigned to any active router interface.
2. Control Plane Policing
Configure and apply a CoPP policy.
Note: CoPP is only available on certain platforms and Cisco IOS releases.
Additional information on the configuration and use of the CoPP feature can be
found at the following URL:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/pro
d_white_paper0900aecd804fa16a.html
3. Infrastructure ACLs (iACL)
Although often difficult to block traffic transiting your network, identifying traffic
which should never be allowed to target your infrastructure devices and block that
traffic at the border of your network is possible. Infrastructure ACLs are considered
a network security best practice and should be considered as a long-term addition
to good network security as well as a workaround for this specific vulnerability.
The white paper entitled “Protecting Your Core: Infrastructure Protection Access
Control Lists” presents guidelines and recommended deployment techniques for
iACLs:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a0
0801a1a55.shtml
4. Configuring Receive Access Lists (rACLs)
For distributed platforms, rACLs may be an option starting in Cisco IOS Release
12.0(21)S2 for the Cisco 12000 series GSR and Cisco IOS Release 12.0(24)S for
the Cisco 7500 series. The receive access lists protect the device from harmful
traffic before the traffic can impact the route processor. Receive path ACLs are
considered a network security best practice, and should be considered as a
long-term addition to good network security, as well as a workaround for this
specific vulnerability. The CPU load is distributed to the line card processors and
helps mitigate load on the main route processor. The white paper entitled “GSR:
Receive Access Control Lists” will help identify and allow legitimate traffic to your
device and deny all unwanted packets:
206
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a0
Release Notes for Cisco uBR7200 Series
for Cisco IOS Release 12.3BC
0801a0a5e.shtml
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 57
Resolved Caveats for Cisco OS Release 12.3(17b)BC6 (continued)
DDTS ID Number
Description
CSCse05736
A router running RCP can be reloaded by a specific packet.
This issue is seen under the following conditions:
•
The router must have RCP enabled.
•
The packet must come from the source address of the designated system
configured to send RCP packets to the router.
•
The packet must have a specific data content.
Workaround: Put access lists on the edge of your network blocking RCP packets to
prevent spoofed RSH packets. Use another protocol such as SCP. Use VTY ACLs.
CSCse56676
Some traps are sent to Simple Network Management Protocol (SNMP)
management stations even when those traps are not configured to be sent to those
stations.
There are no known workarounds.
CSCsg48884
When Subscriber Account Management Interface Specification (SAMIS) cable
metering is configured for streaming every 15 minutes, the Cisco uBR router
streams twice within a 15 minutes period.
This issue occurs in Cisco OS Release 12.3(17a)BC2.
There are no known workarounds.
CSCsh11476
The Cisco uBR7100 series router crashes with the following the watchdog timeout
message:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = CMTS
METERING EXPORT Process.
The issue occurs after a Subscriber Account Management Interface Specification
(SAMIS) outage. When the SAMIS server is down, the Cisco uBR router is
supposed to hold a file in flash and then send one update when the server is back
online. However, when the server came back online, the router crashed when
reading/writing a file to flash.
There are no known workarounds.
CSCsh73925
A Cisco uBR7200 or uBR10000 series CMTS may lose ip connectivity to CM/CPE
devices after removing a secondary IP address on a cable or bundle interface.
Removing a secondary ip address causes all ARP entries (associated with primary
ip address and remaining secondary ip addresses) on that bundle interface to be
deleted. Until the ARP table is rebuilt there could be loss of ip connectivity.
Workaround: Ensure that secondary IP addresses are removed during a
maintenance window.
Another potential workaround would be to segment the CMTS into smaller cable
interface bundle groups or to use separate subinterfaces so that a lower number of
modems and CPE ARP entries are linked to each subinterface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
207
Caveats for Cisco IOS Release 12.3 BC
Table 57
Resolved Caveats for Cisco OS Release 12.3(17b)BC6 (continued)
DDTS ID Number
Description
CSCsd95616
Two crafted Protocol Independent Multicast (PIM) packet vulnerabilities exist in
Cisco IOS software that may lead to a denial of service (DoS) condition. Cisco has
released free software updates that address these vulnerabilities. Workarounds that
mitigate these vulnerabilities are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml.
CSCsh29217
Cisco 10000, uBR10012 and uBR7200 series devices use a User Datagram
Protocol (UDP) based Inter-Process Communication (IPC) channel that is
externally reachable. An attacker could exploit this vulnerability to cause a denial
of service (DoS) condition on affected devices. No other platforms are affected.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml.
Open Caveats for Release 12.3(17b)BC5
Table 58 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC5
release.
Table 58
Open Caveats for Cisco OS Release 12.3(17b)BC5
DDTS ID Number
Description
CSCed62867
After a cable modem termination system (CMTS) reload, the following error
message is logged:
BAD/WRONG BCM3138 FFT
This issue occurs when there is a spectrum management configuration on an
MC28U card.
Workaround: No manual workaround is required; Fast Fourier Transform (FFT)
data collection continues working after the error is logged.
CSCeh33888
A Cisco uBR7246VXR router reloads with the last reset from the watchdog reset.
This issue occurs on a router that has an uBR7200-NPE-G1 processor board and is
running Cisco IOS Release 12.3(9a)BC.
There are no known workarounds.
CSCej87157
All e911 calls are rejected if downstream (DS) bandwidth is saturated, even though
upstream (US) bandwidth is still available.
Workaround: Stop running applications manually to free up DS bandwidth; no
automatic DS bandwidth preemption occurs.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
208
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 58
Open Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCej89390
On a Cisco uBR cable modem termination system (CMTS) platform with
MC28U/MC16U cable line cards, if a CLC interface has a bundle slave configured
on it and the interface bundle slave is brought in/out of the bundle slave
configuration, CMTS features such as cable source-verify dhcp and cable arp, do
not work properly.
There are no known workarounds.
CSCek38944
Support for the CISCO-DOCS-QOS_EXT-MIB has been removed from the
Cisco uBR7200 platform.
CSCek43268
You can now delete a quality of service (QoS) profile that is being used by a cable
modem.
CSCek43887
When the src-ip field of a Confirmation to Receive (CFR) is edited, the tunnel
statistics do not get reset and retain the statistics of the previous flow.
There are no known workarounds.
CSCsb27648
Multiple Qos_reserve Qos_commits occur on a RADIUS packet while intercepting
packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows
CSCsc86355
When customer premises equipment (CPE) devices are joining and leaving
multicast groups on a bundle interface at a very fast rate, and the show interface
bundle x multicast command is issued, an alignment error or a bus error reload
occurs.
There are no known workarounds.
CSCsd26691
When tmda-atmda docsis mode is configured on the interface, the current reserved
value shown on the admission control command is incorrect.
This issue occurs whenever tdma-atdma mode is configured.
There are no known workarounds.
CSCsd30267
The Authentication, Authorization, and Accounting (AAA) per user process is
holding memory, and the router is running out of memory.
This issue occurs on a Cisco uBR router running Cisco IOS Release 12.3(13a)BC2
with PPP over Ethernet (PPPOE) dialing and dynamic access control lists (ACLs).
There are no known workarounds
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
209
Caveats for Cisco IOS Release 12.3 BC
Table 58
Open Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCsd39821
The VID data in the entPhysicalHardwareRev MIB displays the wrong value if the
data field in EEPROM is missing.
This issue affects the Entity MIB in all Cisco uBR7200 software releases if the VID
data field is not programmed.
There are no known workarounds.
CSCsd39843
The entPhysicalSoftwareRev and entPhysicalMfgName MIBs for the
Cisco uBR7200-I/O-2FE/E controller card display the wrong data.
This issue affects the Entity MIB for the Cisco uBR7200 software releases
There are no known workarounds.
CSCsd40636
The show ip vrf ? command does not display the WORD option, and the show
inventory raw ? does not display options at all.
There are no known workarounds.
CSCsd59963
The IP ToS/DSCP byte is always set to 0x00 for PacketCable CALEA replicated
packets, even when original packets have a higher value.
There are no known workarounds.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should return
information about all upstream bandwidth request queues on a Cisco uBR series
cable modem termination system (CMTS). However, only information about the
Committed Information Rate (CIR) and the existent Tiered Best Effort (TBE)
queue is available.
There are no known workarounds.
CSCsd84554
The not in service quality of service (QoS) profile can be enforced to the modem
using the cdxCmtsCmQosProfile MIB, but the not in service QoS profile cannot be
enforced to the modem using the CLI.
There are no known workarounds.
CSCse06619
When changing a bundle member from one bundle to another, the service class
information is not displayed in the show cable dsg tunnel no statistics command.
There are no known workarounds.
CSCse11646
Spurious memory access occurs when monitoring MAC packets with the DOCSIS
Set-Top Gateway (DSG) configuration.
There are no known workarounds.
CSCse14247
The cable quality of service (QoS) profile that is created using the
cdxCmtsCmQosProfile MIB can be modified or deleted when the profile is active
and in use by modems.
There are no known workarounds.
CSCse33368
The router reloads and comes back up with following message:
Last reset from watchdog nmi System was restarted by watchdog timer
expired
Decoded information appears as etext for all the values, which points to possible
corrupted crash information.
There are no known workarounds
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
210
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 58
Open Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCse56676
Some traps are sent to Simple Network Management Protocol (SNMP)
management stations even when those traps are not configured to be sent to those
stations.
There are no known workarounds.
CSCse77050
On a Cisco uBR series cable modem termination system (CMTS), the defaults for
the cable upstream us-channel admission-control percentage command have
changed from enforcing over subscription to 100% of the available upstream
bandwidth, to not enforcing any over subscription level. In addition, if the cable
upstream us-channel admission-control 100 command is configured, the
command is not properly saved and is not maintained after a CMTS reload.
Workaround: If upstream channel over subscription enforcement for minimum
reserved rate services is desired at 100% of upstream bandwidth, then manually
configure a slightly different value. For example: cable upstream us-channel
admission-control 99.
CSCse95886
When you use the no cable admission-control us-bandwidth service-class name
command to disable Admission Control upstream bandwidth for a non-existing
service class, duplicate error messages are generated stating:
This service class has not been configured yet.
There are no known workarounds.
CSCsg13683
Dynamic Service Change (DSC) refresh messages cause out-of-order downstream
(DS) voice packets.
There are no known workarounds.
CSCsg15473
The bandwidth reservation level numbers that are reported by the show interface
cable x/y mac-scheduler command output are inconsistent across traffic types.
There are no known workarounds.
CSCsg46637
When an invalid DSX (Dynamic Service Addition (DSA), Dynamic Service
Deletion (DSD), or Dynamic Service Change (DSC)) message is received, only a
vague message is printed out.
There are no known workarounds.
CSCsg48884
When Subscriber Account Management Interface Specification (SAMIS) cable
metering is configured for streaming every 15 minutes, the Cisco uBR router
streams twice within a 15 minutes period.
This issue occurs in Cisco OS Release 12.3(17a)BC2.
There are no known workarounds.
CSCsg84570
When interface bundle X is entered in configuration mode, the cable modem
termination system (CMTS) crashes.
There are no known workarounds.
CSCsg84837
When Internetwork Packet Exchange (IPX) packets are sent to cable upstream, the
ifInUnknownPkts for upstream counter value remains “0. “
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
211
Caveats for Cisco IOS Release 12.3 BC
Table 58
Open Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCsh11476
The Cisco uBR7200VXR router crashes with the following the watchdog timeout
message:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = CMTS
METERING EXPORT Process.
The issue occurs after a Subscriber Account Management Interface Specification
(SAMIS) outage. When the SAMIS server is down, the Cisco uBR router is
supposed to hold a file in flash and then send one update when the server is back
online. However, when the server came back online, the router crashed when
reading/writing a file to flash.
There are no known workarounds.
CSCsh32153
A Cisco uBR7200 router experiences a memory leak in either the Simple Network
Management Protocol (SNMP) on the NPE400 or NPE-G1 engine, or on the Mc28x
line card in the CR10k Request di process. Both leaks appear to be identical.
Workaround: Reload the NPE and line card.
CSCsh40987
A Cisco uBR7200 router with NPE-G1 crashes with a software-forced crash after
memory corruptions. A log entry similar to the following is reported:
Nov 24 11:08:57.204: validblock_diagnose, code = 10
Nov 24 11:08:57.204: current memory block, bp = 0x64346C38, memory pool
type is Processor
Nov 24 11:08:57.204: data check, ptr = 0x64346C60
Nov 24 11:08:57.204: next memory block, bp = 0x64347064, memory pool
type is Processor
Nov 24 11:08:57.204: data check, ptr = 0x6434708C
Nov 24 11:08:57.204: previous memory block, bp = 0x64346BF4, memory
pool type is Processor
.....
There are no known workarounds.
Resolved Caveats for Release 12.3(17b)BC5
Table 59 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC5
release.
Table 59
Resolved Caveats for Cisco OS Release 12.3(17b)BC5
DDTS ID Number
Description
CSCeh09964
A Performance Routing Engine (PRE) crashes after the following error message:
OVERLAPIP_CM
There are no known workarounds.
CSCek66392
A Performance Routing Engine (PRE) crashes after the following error message:
OVERLAPIP_CM
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
212
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 59
Resolved Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCsb12598
Cisco IOS device may crash while processing malformed Secure Sockets Layer
(SSL) packets. In order to trigger these vulnerabilities, a malicious client must send
malformed packets during the SSL protocol exchange with the vulnerable device.
Successful repeated exploitation of any of these vulnerabilities may lead to a
sustained Denial-of-Service (DoS); however, vulnerabilities are not known to
compromise either the confidentiality or integrity of the data or the device. These
vulnerabilities are not believed to allow an attacker will not be able to decrypt any
previously encrypted information.
Cisco IOS is affected by the following vulnerabilities:
Processing ClientHello messages, documented as Cisco bug ID CSCsb12598
Processing ChangeCipherSpec messages, documented as Cisco bug ID
CSCsb40304
Processing Finished messages, documented as Cisco bug ID CSCsd92405
Cisco has made free software available to address these vulnerabilities for affected
customers. There are workarounds available to mitigate the effects of these
vulnerabilities.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml.
Note
Another related advisory has been posted with this advisory. This
additional advisory also describes a vulnerability related to cryptography
that affects Cisco IOS. This related advisory is available at the following
link:
http://www.cisco.com/warp/public/707/cisco-sa-20070522-crypto.shtml.
A combined software table for Cisco IOS is available to aid customers in choosing
a software releases that fixes all security vulnerabilities published as of May 22,
2007. This software table is available at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20070522-cry-bundle.shtml.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
213
Caveats for Cisco IOS Release 12.3 BC
Table 59
Resolved Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCsb40304
Cisco IOS device may crash while processing malformed Secure Sockets Layer
(SSL) packets. In order to trigger these vulnerabilities, a malicious client must send
malformed packets during the SSL protocol exchange with the vulnerable device.
Successful repeated exploitation of any of these vulnerabilities may lead to a
sustained Denial-of-Service (DoS); however, vulnerabilities are not known to
compromise either the confidentiality or integrity of the data or the device. These
vulnerabilities are not believed to allow an attacker will not be able to decrypt any
previously encrypted information.
Cisco IOS is affected by the following vulnerabilities:
Processing ClientHello messages, documented as Cisco bug ID CSCsb12598
Processing ChangeCipherSpec messages, documented as Cisco bug ID
CSCsb40304
Processing Finished messages, documented as Cisco bug ID CSCsd92405
Cisco has made free software available to address these vulnerabilities for affected
customers. There are workarounds available to mitigate the effects of these
vulnerabilities.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml.
Note
Another related advisory has been posted with this advisory. This
additional advisory also describes a vulnerability related to cryptography
that affects Cisco IOS. This related advisory is available at the following
link:
http://www.cisco.com/warp/public/707/cisco-sa-20070522-crypto.shtml.
A combined software table for Cisco IOS is available to aid customers in choosing
a software releases that fixes all security vulnerabilities published as of May 22,
2007. This software table is available at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20070522-cry-bundle.shtml.
CSCsc53225
If the connection between a PacketCable Call Management Server (CMS) and the
cable modem termination system (CMTS) is not completely established, and the
CMS does not correctly terminate the session by sending a Transmission Control
Protocol FIN packet, the connection will still show up as a COPS server in the show
cops server command output. This server entry is not removed unless the clear tcp
tcb command is entered to remove the TCP connection.
There are no known workarounds.
CSCsc72722
Transmission Control Protocol (TCP) connections that are opened through a Cisco
IOS Firewall (Context-Based Access Control (CBAC)) do not timeout.
This issue occurs when the Cisco IOS Firewall (CBAC) is enabled because the TCP
idle timer for a session can be reset even by TCP packets that fail TCP inspection
and are subsequently dropped. This situation can lead to the TCP session not timing
out.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
214
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 59
Resolved Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCsc95014
A Cisco router makes alignment corrections as depicted in the show align EXEC
command output.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.2(15)BC2i.
There are no known workarounds
CSCsd92405
Cisco IOS device may crash while processing malformed Secure Sockets Layer
(SSL) packets. In order to trigger these vulnerabilities, a malicious client must send
malformed packets during the SSL protocol exchange with the vulnerable device.
Successful repeated exploitation of any of these vulnerabilities may lead to a
sustained Denial-of-Service (DoS); however, vulnerabilities are not known to
compromise either the confidentiality or integrity of the data or the device. These
vulnerabilities are not believed to allow an attacker will not be able to decrypt any
previously encrypted information.
Cisco IOS is affected by the following vulnerabilities:
Processing ClientHello messages, documented as Cisco bug ID CSCsb12598
Processing ChangeCipherSpec messages, documented as Cisco bug ID
CSCsb40304
Processing Finished messages, documented as Cisco bug ID CSCsd92405
Cisco has made free software available to address these vulnerabilities for affected
customers. There are workarounds available to mitigate the effects of these
vulnerabilities.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070522-SSL.shtml.
Note
Another related advisory has been posted with this advisory. This
additional advisory also describes a vulnerability related to cryptography
that affects Cisco IOS. This related advisory is available at the following
link:
http://www.cisco.com/warp/public/707/cisco-sa-20070522-crypto.shtml.
A combined software table for Cisco IOS is available to aid customers in choosing
a software releases that fixes all security vulnerabilities published as of May 22,
2007. This software table is available at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20070522-cry-bundle.shtml.
CSCse78507
Packets are delayed at the cable interface if rate-limiting is used.
Workaround: Remove the cable downstream rate-limit token-bucket shaping
max-delay command.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
215
Caveats for Cisco IOS Release 12.3 BC
Table 59
Resolved Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCsf07847
Specifically crafted Cisco Discovery Protocol (CDP) packets can cause a router to
allocate and keep extra memory. Exploitation of this behavior by sending multiple
specifically crafted CDP packets could cause memory allocation problems on the
router. Since CDP is a layer-2 protocol, this issue can only be triggered by systems
that are residing on the same network segment.
This issue can occur when the CDP packet header length is lesser than predefined
header length(4 bytes).
Workaround: Disable CDP on interfaces where it is not necessary.
CSCsg16908
Multiple vulnerabilities exist in the Cisco IOS File Transfer Protocol (FTP) Server
feature. These vulnerabilities include Denial of Service, improper verification of
user credentials and the ability to read or write any file in the device's filesystem,
including the device's saved configuration, which may include passwords or other
sensitive information.
The Cisco IOS FTP Server is an optional service that is disabled by default. Devices
that are not specifically configured to enable the Cisco IOS FTP Server service are
unaffected by these vulnerabilities.
This vulnerability does not apply to the Cisco IOS FTP Client feature.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070509-iosftp.shtml.
CSCsg17896
On a Cisco uBR7200 series cable modem termination system (CMTS), when
downstream load balancing between the MC28U and legacy MC16C/MC28C line
cards occurs, load balancing can take a very long time to successfully move
modems between the two types of interfaces.
There are no known workarounds.
CSCsg21480
A Cisco uBR7200 series router running Cisco IOS Release 12.3(9a)BC6 crashes
due to a divide-by-zero exception. In addition, some spurious access is recorded.
This issue occurs on a router configured for the Simple Network Management
Protocol (SNMP).
Workaround: Turn off the SNMP server.
CSCsg58428
If Baseline Privacy Interface (BPI) is enabled and the test cable dcc command is
issued with init technique 1~4, the cable modem (CM) cannot be moved in the same
upstream. The CM still shows online(pt) on the cable modem termination system
(CMTS), but the CM is not pingable at all.
Note that if BPI is disabled, or if init technique 0 is used, the CM remains pingable.
The problem also does not occur if the CM is moved to another upstream (US) other
than the current one.
Workaround: Disable BPI, use init tech 0, or move the CM to another US than the
current one.
CSCsg67542
The new lb_us_across_ds policy uses the DS LB group method to compare the
upstream (US) load across the downstream (DS) and pick the target DS. The
criteria to select the target DS and US are different. The US LB group method
should be used to search for a target interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
216
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 59
Resolved Caveats for Cisco OS Release 12.3(17b)BC5 (continued)
DDTS ID Number
Description
CSCsg70355
Starting in calendar year 2007, daylight savings summer-time rules may cause
Cisco IOS to generate timestamps (such as in syslog messages) that are off by one
hour.
The issue occurs because the Cisco IOS clock summer-time zone recurring
configuration command uses the United States standards for daylight savings time
rules by default. The Energy Policy Act of 2005 (H.R.6.ENR), Section 110 changes
the start date from the first Sunday of April to the second Sunday of March. It
changes the end date from the last Sunday of October to the first Sunday of
November.
Workaround: Use the clock summer- time configuration command to manually
configure the proper start date and end date for daylight savings time.
Note that using Network Time Protocol (NTP) is not a workaround to this problem.
NTP does not carry any information about time zones or summertime.
CSCsg70555
When frequency stacking and pre-equalization are enabled on the stack upstreams,
certain mod profile settings can cause modems to get stuck in the init() state.
This issue occurs because the stack upstreams have different settings, especially
different mod profiles, and leads to incorrect programming of the PHY chip device.
Workaround: Use the same modulation profile on the frequency stacked upstreams.
CSCsg80513
Traceback occurs on the changing bundle associated with the cable interface.
There are no known workarounds.
CSCsg83603
The downstream frequency on internal upconverter based line cards cannot be set
to a fine enough granularity for Harmonically Related Carrier (HRC)/
Incrementally Related Carrier (IRC) channel plans.
All cable modem termination system (CMTS) line cards with internal upconverters
(MC520, MC28u, MC16u) must support HRC channel plans. These plans require
the ability to set offset frequencies to a resolution of at least 25 kHz or better. We
need to restore the 12.5 kHz settable resolution on our internal line cards to allow
customers who have HRC channel plans to bring cable modems online.
Workaround: Select a frequency as close to the HRC channel as possible and most
modems should lock. If the modem does not lock, then use an IF based line card to
an external upconverter that supports HRC/IRC channel frequencies.
CSCsg91843
The cable modem is not load balanced on the last upstream.
This issue occurs because the downstream (DS) load balancing is following a
different card (policy us-groups-across-ds).
Workaround: Enter the test cable DCC command to move the modem
Open Caveats for Release 12.3(17b)BC4
Table 60 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC4
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
217
Caveats for Cisco IOS Release 12.3 BC
Table 60
Open Caveats for Cisco IOS Release 12.3(17b)BC4
DDTS ID Number
Description
CSCed62867
After a cable modem termination system (CMTS) reload, the following error
message is logged:
BAD/WRONG BCM3138 FFT
This issue occurs when there is a spectrum management configuration on an
MC28U card.
Workaround: No manual workaround is required; Fast Fourier Transform (FFT)
data collection continues working after the error is logged.
CSCeh33888
A Cisco router reloads with the last reset from a watchdog reset.
This issue occurs on a router that has a Cisco uBR7200-NPE-G1 processor board
and is running Cisco IOS Release 12.3(9a)BC.
There are no known workarounds.
CSCej87157
All e911 calls are rejected if downstream (DS) bandwidth is saturated, even though
upstream (US) bandwidth is still available.
Workaround: Stop running applications manually to free up DS bandwidth; no
automatic DS bandwidth preemption occurs.
CSCej89390
On a Cisco uBR cable modem termination system (CMTS) platform with
MC28U/MC16U cable line cards, if a CLC interface has a bundle slave configured
on it and the interface bundle slave is brought in/out of the bundle slave
configuration, CMTS features such as cable source-verify dhcp and cable arp, do
not work properly.
There are no known workarounds.
CSCek43268
You can now delete a quality of service (QoS) profile that is being used by a cable
modem.
CSCek43887
When the src-ip field of a Confirmation to Receive (CFR) is edited, the tunnel
statistics do not get reset and retain the statistics of the previous flow.
There are no known workarounds.
CSCsa53610
The router fails to come up in Route Processor Redundancy (RPR) mode.
This issue is caused by the fix for CSCef64718, which moved the time point of
posting PEER_COMM loss at switchover.
There are no known workarounds.
CSCsa63516
The following traceback occurs during a test run, which includes maximum
concurrent active voice calls on all upstreams with data traffic injected from the
customer premises equipment (CPE) behind the cable modem:
SLOT 3/0: Feb 14 10:11:00.114 EST: %SCHED-3-STUCKMTMR: Sleep with
expired managed timer 62C7942C, time 0x31FB2BFC (00:00:00 ago).
-Process= "Dynamic Services Timer Process", ipl= 4, pid= 37
-Traceback= 60327044 6032749C 60447AE4
The traceback occurs only when the offered load (voice + data) exceeds the
maximum bandwidth available on the upstreams.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
218
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 60
Open Caveats for Cisco IOS Release 12.3(17b)BC4 (continued)
DDTS ID Number
Description
CSCsb27648
Multiple Qos_reserve Qos_commits occur on a RADIUS packet while intercepting
packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsc27292
Integrated customer premises equipment (CPE) inside of certain brands of cable
modems and set-top box units are unable to acquire an IP address using the
Cisco uBR cable modem termination system (CMTS).
The issue occurs when cable interface bundling is configured on
Cisco IOS Release 12.3(13a)BC, but not in earlier Cisco IOS releases.
Workaround: Revert to an earlier release of Cisco IOS for the Cisco uBR CMTS,
or unconfigure cable interface bundling.
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc86355
When customer premises equipment (CPE) devices are joining and leaving
multicast groups on a bundle interface at a very fast rate, and the show interface
bundle x multicast command is issued, an alignment error or a bus error reload
occurs.
There are no known workarounds.
CSCsc95014
A Cisco router makes alignment corrections as depicted in the show align EXEC
command output.
This issue occurs on a Cisco uBR7200 router running
Cisco IOS Release 12.2(15)BC2i, however, it may be platform independent.
There are no known workarounds.
CSCsd26691
When tmda-atmda docsis mode is configured on the interface, the current reserved
value shown on the admission control command is incorrect.
This issue occurs whenever tdma-atdma mode is configured.
There are no known workarounds.
CSCsd30267
The Authentication, Authorization, and Accounting (AAA) per user process is
holding memory, and the router is running out of memory.
This issue occurs on a Cisco uBR7200 router running
Cisco IOS Release 12.3(13a)BC2 with PPP over Ethernet (PPPOE) dialing and
dynamic access control lists (ACLs).
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
219
Caveats for Cisco IOS Release 12.3 BC
Table 60
Open Caveats for Cisco IOS Release 12.3(17b)BC4 (continued)
DDTS ID Number
Description
CSCsd30319
Modems get stuck in the init(o) state following an online insertion and removal
(OIR) operation if the replacement card type is not identical to the original card.
This issue is related to virtual interface bundling, and only occurs on interfaces that
are members of a cable bundle.
Workaround: Reboot the router.
CSCsd39821
The VID data in entPhysicalHardwareRev MIB displays the wrong value if the data
field in EEPROM is missing.
This issue affects the Entity MIB in all Cisco uBR7246 software releases if the VID
data field is not programmed.
There are no known workarounds.
CSCsd39843
The entPhysicalSoftwareRev and entPhysicalMfgName MIBs for the
Cisco uBR7200-I/O-2FE/E controller card display the wrong data.
This issue affects the Entity MIB for the Cisco uBR7200 software releases
There are no known workarounds.
CSCsd40636
The show ip vrf ? command does not display the WORD option, and the show
inventory raw ? does not display options at all.
There are no known workarounds.
CSCsd59963
The IP ToS/DSCP byte is always set to 0x00 for PacketCable CALEA replicated
packets, even when original packets have a higher value.
There are no known workarounds.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should return
information about all upstream bandwidth request queues on a Cisco uBR series
cable modem termination system (CMTS). However, only information about the
Committed Information Rate (CIR) and the existent Tiered Best Effort (TBE)
queue is available.
There are no known workarounds.
CSCsd84554
The not in service quality of service (QoS) profile can be enforced to the modem
using the cdxCmtsCmQosProfile MIB, but the not in service QoS profile cannot be
enforced to the modem using the CLI.
There are no known workarounds.
CSCse06619
When changing a bundle member from one bundle to another, the service class
information is not displayed in the show cable dsg tunnel no statistics command.
There are no known workarounds.
CSCse11646
Spurious memory access occurs when monitoring MAC packets with the DOCSIS
Set-Top Gateway (DSG) configuration.
There are no known workarounds.
CSCse14247
The cable quality of service (QoS) profile that is created using the
cdxCmtsCmQosProfile MIB can be modified or deleted when the profile is active
and in use by modems.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
220
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 60
Open Caveats for Cisco IOS Release 12.3(17b)BC4 (continued)
DDTS ID Number
Description
CSCse33368
The router reloads and comes back up with following message:
Last reset from watchdog nmi System was restarted by watchdog timer
expired
Decoded information appears as etext for all the values, which points to possible
corrupted crash information.
There are no known workarounds.
CSCse77050
On a Cisco uBR series cable modem termination system (CMTS), the defaults for
the cable upstream us-channel admission-control percentage command have
changed from enforcing over subscription to 100% of the available upstream
bandwidth, to not enforcing any over subscription level. In addition, if the cable
upstream us-channel admission-control 100 command is configured, the
command is not properly saved and is not maintained after a CMTS reload.
Workaround: If upstream channel over subscription enforcement for minimum
reserved rate services is desired at 100% of upstream bandwidth, then manually
configure a slightly different value. For example: cable upstream us-channel
admission-control 99.
CSCse78507
Packets are delayed at the cable interface if rate-limiting is used
Workaround: Remove the cable downstream rate-limit token-bucket shaping
max-delay command.
CSCse95886
When you use the no cable admission-control us-bandwidth service-class name
command to disable Admission Control upstream bandwidth for a non-existing
service class, duplicate error messages are generated stating:
This service class has not been configured yet.
There are no known workarounds.
CSCse96237
The build image with the fix for CSCse80641 causes the ubr7200-p-mz image build
to fail.
There are no known workarounds.
CSCsf31427
The Call Forward No Answer (CFNA) feature does not work on
Cisco uBR7200 series routers after the CSCsb27648 fix is added.
There are no known workarounds.
CSCsg13683
Dynamic Service Change (DSC) refresh messages cause out-of-order downstream
(DS) voice packets.
There are no known workarounds.
CSCsg15473
The bandwidth reservation level numbers that are reported by the show interface
cable x/y mac-scheduler command output are inconsistent across traffic types.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
221
Caveats for Cisco IOS Release 12.3 BC
Table 60
Open Caveats for Cisco IOS Release 12.3(17b)BC4 (continued)
DDTS ID Number
Description
CSCsg17896
On a Cisco uBR7200VXR series cable modem termination system (CMTS), when
downstream load balancing between the MC28U and legacy MC16C/MC28C line
cards occurs, load balancing can take a very long time to successfully move
modems between the two types of interfaces.
There are no known workarounds.
CSCsg21480
A Cisco uBR7200 series router running Cisco IOS Release 12.3(9a)BC6 crashes
due to a divide-by-zero exception. In addition, some spurious access is recorded.
This issue occurs on a router configured for the Simple Network Management
Protocol (SNMP).
Workaround: Turn off the SNMP server.
Resolved Caveats for Release 12.3(17b)BC4
Table 61 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC4
release.
Table 61
Resolved Caveats for Cisco IOS Release 12.3(17b)BC4
DDTS ID Number
Description
CSCsg34910
Support was added to allow load balancing to even out upstream (US) load
balancing (LB) group members.
Open Caveats for Release 12.3(17b)BC3
Table 62 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC3
release.
Table 62
Open Caveats for Cisco IOS Release 12.3(17b)BC3
DDTS ID Number
Description
CSCed62867
After a cable modem termination system (CMTS) reload, the following error
message is logged:
BAD/WRONG BCM3138 FFT
This issue occurs when there is a spectrum management configuration on an
MC28U card.
Workaround: No manual workaround is required; Fast Fourier Transform (FFT)
data collection continues working after the error is logged.
CSCeh33888
A Cisco router reloads with the last reset from a watchdog reset.
This issue occurs on a router that has a Cisco uBR7200-NPE-G1 processor board
and is running Cisco IOS Release 12.3(9a)BC.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
222
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 62
Open Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCej87157
All e911 calls are rejected if downstream (DS) bandwidth is saturated, even though
upstream (US) bandwidth is still available.
Workaround: Stop running applications manually to free up DS bandwidth; no
automatic DS bandwidth preemption occurs.
CSCej89390
On a Cisco uBR cable modem termination system (CMTS) platform with
MC28U/MC16U cable line cards, if a CLC interface has a bundle slave configured
on it and the interface bundle slave is brought in/out of the bundle slave
configuration, CMTS features, such as cable source-verify dhcp and cable arp,
do not work properly.
There are no known workarounds.
CSCek43268
You can now delete a quality of service (QoS) profile that is being used by a cable
modem.
CSCek43887
When the src-ip field of a Confirmation to Receive (CFR) is edited, the tunnel
statistics do not get reset and retain the statistics of the previous flow.
There are no known workarounds.
CSCsa53610
The router fails to come up in Route Processor Redundancy (RPR) mode.
This issue is caused by the fix for CSCef64718, which moved the time point of
posting PEER_COMM loss at switchover.
There are no known workarounds.
CSCsa63516
The following traceback occurs during a test run, which includes maximum
concurrent active voice calls on all upstreams with data traffic injected from the
customer premises equipment (CPE) behind the cable modem:
SLOT 3/0: Feb 14 10:11:00.114 EST: %SCHED-3-STUCKMTMR: Sleep with
expired managed timer 62C7942C, time 0x31FB2BFC (00:00:00 ago).
-Process= "Dynamic Services Timer Process", ipl= 4, pid= 37
-Traceback= 60327044 6032749C 60447AE4
The traceback occurs only when the offered load (voice + data) exceeds the
maximum bandwidth available on the upstreams.
There are no known workarounds.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsc27292
Integrated customer premises equipment (CPE) inside of certain brands of cable
modems and set-top box units are unable to acquire an IP address using the
Cisco uBR cable modem termination system (CMTS).
The issue occurs when cable interface bundling is configured on Cisco IOS
Release 12.3(13a)BC, but not in earlier Cisco IOS releases.
Workaround: Revert to an earlier release of Cisco IOS for the Cisco uBR CMTS,
or unconfigure cable interface bundling.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
223
Caveats for Cisco IOS Release 12.3 BC
Table 62
Open Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc86355
When customer premises equipment (CPE) devices are joining and leaving
multicast groups on a bundle interface at a very fast rate, and the show interface
bundle x multicast command is issued, an alignment error or a bus error reload
occurs.
There are no known workarounds.
CSCsc95014
A Cisco router makes alignment corrections as depicted in the show align EXEC
command output.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.2(15)BC2i, however, it may be platform independent.
There are no known workarounds.
CSCsd26691
When tmda-atmda docsis mode is configured on the interface, the current reserved
value shown on the admission control command is incorrect.
This issue occurs whenever tdma-atdma mode is configured.
There are no known workarounds.
CSCsd30267
The Authentication, Authorization, and Accounting (AAA) per user process is
holding memory, and the router is running out of memory.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(13a)BC2 with PPP over Ethernet (PPPOE) dialing and dynamic
access control lists (ACLs).
There are no known workarounds.
CSCsd30319
Modems get stuck in the init(o) state following an online insertion and removal
(OIR) operation if the replacement card type is not identical to the original card.
This issue is related to virtual interface bundling, and only occurs on interfaces that
are members of a cable bundle.
Workaround: Reboot the router.
CSCsd39821
The VID data in entPhysicalHardwareRev MIB displays the wrong value if the data
field in EEPROM is missing.
This issue affects the Entity MIB in all Cisco uBR7246 software releases if the VID
data field is not programmed.
There are no known workarounds.
CSCsd39843
The entPhysicalSoftwareRev and entPhysicalMfgName MIBs for the
Cisco uBR7200-I/O-2FE/E controller card display the wrong data.
This issue affects the Entity MIB for the Cisco uBR7200 software releases
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
224
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 62
Open Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCsd40636
The show ip vrf ? command does not display the WORD option, and the show
inventory raw ? does not display options at all.
There are no known workarounds.
CSCsd59963
The IP ToS/DSCP byte is always set to 0x00 for PacketCable CALEA replicated
packets, even when original packets have a higher value.
There are no known workarounds.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should return
information about all upstream bandwidth request queues on a Cisco uBR series
cable modem termination system (CMTS). However, only information about the
Committed Information Rate (CIR) and the existent Tiered Best Effort (TBE)
queue is available.
There are no known workarounds.
CSCsd84554
The not in service quality of service (QoS) profile can be enforced to the modem
using the cdxCmtsCmQosProfile MIB, but the not in service QoS profile cannot be
enforced to the modem using the CLI.
There are no known workarounds.
CSCse06619
When changing a bundle member from one bundle to another, the service class
information is not displayed in the show cable dsg tunnel no statistics command.
There are no known workarounds.
CSCse11646
Spurious memory access occurs when monitoring MAC packets with the DOCSIS
Set-Top Gateway (DSG) configuration.
There are no known workarounds.
CSCse14247
The cable quality of service (QoS) profile that is created using the
cdxCmtsCmQosProfile MIB can be modified or deleted when the profile is active
and in use by modems.
There are no known workarounds.
CSCse33368
The router reloads and comes back up with following message:
Last reset from watchdog nmi System was restarted by watchdog timer
expired
Decoded information appears as etext for all the values, which points to possible
corrupted crash information.
There are no known workarounds.
CSCse77050
On a Cisco uBR series cable modem termination system (CMTS), the defaults for
the cable upstream us-channel admission-control percentage command have
changed from enforcing over subscription to 100% of the available upstream
bandwidth, to not enforcing any over subscription level. In addition, if the cable
upstream us-channel admission-control 100 command is configured, the
command is not properly saved and is not maintained after a CMTS reload.
Workaround: If upstream channel over subscription enforcement for minimum
reserved rate services is desired at 100% of upstream bandwidth, then manually
configure a slightly different value. For example: cable upstream us-channel
admission-control 99.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
225
Caveats for Cisco IOS Release 12.3 BC
Table 62
Open Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCse78507
Packets are delayed at the cable interface if rate-limiting is used
Workaround: Remove the cable downstream rate-limit token-bucket shaping
max-delay command.
CSCse95886
When you use the no cable admission-control us-bandwidth service-class name
command to disable Admission Control upstream bandwidth for a non-existing
service class, duplicate error messages are generated stating:
This service class has not been configured yet.
There are no known workarounds.
CSCse96237
The build image with the fix for CSCse80641 causes the ubr7200-p-mz image build
to fail.
There are no known workarounds.
CSCsf31427
The Call Forward No Answer (CFNA) feature does not work on Cisco uBR7200
series routers after the CSCsb27648 fix is added.
There are no known workarounds.
CSCsg13683
Dynamic Service Change (DSC) refresh messages cause out-of-order downstream
(DS) voice packets.
There are no known workarounds.
CSCsg15473
The bandwidth reservation level numbers that are reported by the show interface
cable x/y mac-scheduler command output are inconsistent across traffic types.
There are no known workarounds.
CSCsg17896
On a Cisco uBR7200VXR series cable modem termination system (CMTS), when
downstream load balancing between the MC28U and legacy MC16C/MC28C line
cards occurs, load balancing can take a very long time to successfully move
modems between the two types of interfaces.
There are no known workarounds.
CSCsg21480
A Cisco uBR7200 series router running Cisco IOS Release 12.3(9a)BC6 crashes
due to a divide-by-zero exception. In addition, some spurious access is recorded.
This issue occurs on a router configured for the Simple Network Management
Protocol (SNMP).
Workaround: Turn off the SNMP server.
Resolved Caveats for Release 12.3(17b)BC3
Table 63 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17b)BC3
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
226
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 63
Resolved Caveats for Cisco IOS Release 12.3(17b)BC3
DDTS ID Number
Description
CSCeb54486
A router running Cisco IOS Release 12.2(11)BC3, PRE A crashes due to a bus
error, but the active Performance Routing Engine (PRE) doesn't switchover to
PRE B.
This issue occurs when the show snmp sessions command is executed.
Workaround: Do not execute the show snmp sessions command.
CSCee27341
The router experiences a software-forced crash (memory corruption in snmp) after
executing the following command:
no snmp-server host xx.xx.xx.xx public
There are no known workarounds other than not using the no snmp-server host
command.
CSCei93982
The router crashes unexpectedly because of Network Address Translation (NAT)
source and destination port handling.
This issue occurs when NAT is enabled and an application uses two well-known
ports: one for the source, and the other for destination. The outgoing translation is
created, but on the return trip, because NAT is using the previous source port as the
destination, NAT may use the incorrect algorithm. For example, if a Point-to-Point
Tunneling Protocol (PPTP) session is initiated to the well-known port 1723 from
source port 21 for the File Transfer Protocol (FTP), then the outgoing packet will
create an FTP translation (because source information is examined in the outgoing
direction). When the packet is returned, the source information is examined again
to determine its packet type. In this case, because the source port is 1723, NAT
assumes this is a PPTP packet and attempts to perform PPTP NAT operations on
the data structure that NAT built for an FTP packet. This condition can lead to a
router crash.
There are no known workarounds.
CSCek26492
Symptoms: A router may crash if it receives a packet with a specific crafted IP
option as detailed in Cisco Security Advisory: Crafted IP Option Vulnerability:
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtm
l
Conditions: This DDTS resolves a symptom of CSCec71950. Cisco IOS with this
specific DDTS are not at risk of crash if CSCec71950 has been resolved in the
software.
Workaround: Cisco IOS versions with the fix for CSCec71950 are not at risk for
this issue and no workaround is required. If CSCec71950 is not resolved, see the
following Cisco Security Advisory: Crafted IP Option Vulnerability for
workaround information:
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtm
l
CSCek41538
Traceback occurs at the cable modem termination system (CMTS) when Network
Address Translation (NAT) is configured and DOCSIS Set-Top Gateway (DSG)
traffic is sent in upstream (US) and downstream (DS) directions.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
227
Caveats for Cisco IOS Release 12.3 BC
Table 63
Resolved Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC address-based cable monitor does not
show packets from service identifiers (SIDs) other than the primary.
This functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsc19010
A Gate-Set is sent to the cable modem termination system (CMTS), but no response
is received.
This issue occurs when modifying a Gate.
There are no known workarounds.
CSCsc36824
A Cisco router reloads unexpectedly due to a bus error exception. The crashinfo
shows a translational bridging (TLB) (load or instruction fetch) exception.
This issue occurs with Network Address Translation (NAT) H.323 slow start calls.
Workaround: The unexpected reload does not occur when using H.323 FastStart.
CSCsc60249
Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of
which is also shared with Cisco Unified Communications Manager. These
vulnerabilities pertain to the following protocols or features:
•
Session Initiation Protocol (SIP)
•
Media Gateway Control Protocol (MGCP)
•
Signaling protocols H.323, H.254
•
Real-time Transport Protocol (RTP)
•
Facsimile reception
Cisco has made free software available to address these vulnerabilities for affected
customers. Fixed Cisco IOS software listed in the Software Versions and Fixes
section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
CSCsc69945
Cable modems that are connected to an MC28U style line card on a
Cisco uBR7200VXR series cable modem termination system (CMTS) become
stuck in the init(d) state after a line card recovers from an unexpected reset.
The state appears in the show cable modem command. In addition, an error
message similar to the following appears as the line card comes back online:
%PARSER-4-BADCFG: Unexpected end of configuration file.
The issue occurs only when multicast quality of service (QoS) service flows, as
configured by the cable interface cable match address command, have been
activated.
Workaround: Manually shut/no shut any affected cable interfaces.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
228
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 63
Resolved Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCsc78813
While using Network Address Translation (NAT) in an overlapping network
configuration, the IP address inside a Domain Name System (DNS) reply payload
from the name server is not translated at the NAT router.
This issue occurs on a Cisco router that runs Cisco IOS Release 12.3(18) and that
has the nat outside source command enabled. The condition can also occur in
Cisco IOS Release 12.4 or Cisco IOS Release 12.4T.
There are no known workarounds.
CSCsd10009
When the debug cable privacy command is enabled, the Cisco uBR series cable
modem termination system (CMTS) generates an error message similar to the
following, followed by a traceback:
SLOT 5/0: Jan 18 22:12:33.320: %SCHED-2-EDISMSCRIT: Critical/high
priority process CMTS MAC Parser may not dismiss.
-Process= “CMTS MAC Parser”, ipl= 0, pid= 43
This issue stops Baseline Privacy Interface Plus (BPI+) enabled cable modems
from negotiating BPI+ encryption with the CMTS.
This issue occurs when debug is enabled and a cable modem running BPI+ tries to
come online.
Workaround: Disable the debug with the no debug cable privacy command. Use
an alternative debug command that produces similar, but more verbose output, the
debug cable bpiatp command.
CSCsd23426
Cable modems using non-real time polling service flows with a 300ms polling
interval are not allowed to register with the cable modem termination system
(CMTS).
Workaround: Use a polling interval that is not 300ms; for example, 250ms has been
tested and works.
CSCsd29733
Some downstream service flows experience rate limit delayed packets. These flows
should not be delaying packets.
This issue usually occurs with voice calls using codex that send a higher traffic rate
of around 100pps. Downstream calls for these flows may see rate limit delayed
packets and rate limit dropped packets. In some cases, this degrades voice quality.
There are no known workarounds.
CSCsd58381
Processing a specially crafted IPv6 Type 0 Routing header can crash a device
running Cisco IOS software. This vulnerability does not affect IPv6 Type 2 Routing
header which is used in mobile IPv6. IPv6 is not enabled by default in Cisco IOS.
Cisco has made free software available to address this vulnerability for affected
customers.
There are workarounds available to mitigate the effects of the vulnerability. The
workaround depends on if Mobile IPv6 is used and what version on Cisco IOS is
being currently used.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070124-IOS-IPv6.shtml
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
229
Caveats for Cisco IOS Release 12.3 BC
Table 63
Resolved Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCsd67935
When a Dynamic Host Configuration Protocol (DHCP) BOOTREQUEST is
received from customer premises equipment (CPE) that has a PPP over Ethernet
(PPPoE) session open with the Cisco uBR router, the PPPoE session will be
terminated once the reply is GLEANed.
Workaround: Perform the following steps:
1. Configure a static IP address on the CPE.
2. Prevent the DHCP BOOTREQUEST at the CPE.
3. If DHCP scripting is possible, prevent the reply to the CPE from the server.
CSCsd85177
Randomly, the signal-to-noise ratio (SNR) cosmetically decreases -10 dB with
MC-28u and 16u/x cards.
Workaround: Turn off ingress-noise cancellation, and then immediately turn it back
on again. SNR returns to normal levels.
CSCsd92344
A Cisco uBR series cable modem termination system (CMTS) generates error
messages similar to the following:
%SYS-3-CPUHOG: Task is running for (2008)msecs, more than (2000)msecs
(699/198),process = DHCPD Receive.
This message is followed by another error message similar to the following and a
software-forced reload:
%UBR7200-4-FAILED_DS_SID_LOOKUP: Failed to find host in DS on int
SID # 4271, IP = 10.99.82.19, MAC = 0004.1af1.c34a
with
This issue occurs when the cable or virtual bundle interface configuration cable
source-verify dhcp command is configured, and is triggered by end hosts that have
duplicate or spoofed Ethernet MAC addresses.
Workaround: Remove the dhcp portion of the cable source-verify dhcp command,
and use the cable source-verify command only.
CSCse05642
Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of
which is also shared with Cisco Unified Communications Manager. These
vulnerabilities pertain to the following protocols or features:
•
Session Initiation Protocol (SIP)
•
Media Gateway Control Protocol (MGCP)
•
Signaling protocols H.323, H.254
•
Real-time Transport Protocol (RTP)
•
Facsimile reception
Cisco has made free software available to address these vulnerabilities for affected
customers. Fixed Cisco IOS software listed in the Software Versions and Fixes
section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
230
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 63
Resolved Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCse05680
Cable modem termination system (CMTS) read-only quality of service (QoS)
profiles are deleted.
This issue occurs in platforms without distributed line cards.
There are no known workarounds.
CSCse30830
After a Simple Network Management Protocol (SNMP) request on the cable
modem termination system (CMTS), there is steady packet loss on the upstream
path (form the modem to the voice gateway.) Even though the SNMP requests are
stopped and SNMP lines are removed (using config mode) from the running
configuration, the packet loss status remains until a reload of CMTS occurs.
Workaround: Perform a CMTS reload.
CSCse37931
The cable source verify leasequery-filter does not work with virtual bundling.
There are no known workarounds.
CSCse68138
Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of
which is also shared with Cisco Unified Communications Manager. These
vulnerabilities pertain to the following protocols or features:
•
Session Initiation Protocol (SIP)
•
Media Gateway Control Protocol (MGCP)
•
Signaling protocols H.323, H.254
•
Real-time Transport Protocol (RTP)
•
Facsimile reception
Cisco has made free software available to address these vulnerabilities for affected
customers. Fixed Cisco IOS software listed in the Software Versions and Fixes
section contains fixes for all vulnerabilities mentioned in this advisory.
There are no workarounds available to mitigate the effects of any of the
vulnerabilities apart from disabling the protocol or feature itself.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml
CSCse70718
On a Cisco uBR series cable modem termination system (CMTS), cable modems
on an MC28U series cable line card are unable to progress past the init(d) state on
certain upstream ports.
The issue occurs after an MC28U cable line card has undergone online insertion
and removal (OIR), or after the MC28U line card is unexpectedly reset. The issue
occurs only when upstream connector sharing is configured. Cable modems on the
numerically lowest upstream channel to share a connector can be stuck in the init(d)
state.
Workaround: Reconfigure the connector sharing configuration command on
affected upstreams after the line card OIR.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
231
Caveats for Cisco IOS Release 12.3 BC
Table 63
Resolved Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCsf04754
Multiple Cisco products contain either of two authentication vulnerabilities in the
Simple Network Management Protocol version 3 (SNMPv3) feature. These
vulnerabilities can be exploited when processing a malformed SNMPv3 message.
These vulnerabilities could allow the disclosure of network information or may
enable an attacker to perform configuration changes to vulnerable devices. The
SNMP server is an optional service that is disabled by default. Only SNMPv3 is
impacted by these vulnerabilities. Workarounds are available for mitigating the
impact of the vulnerabilities described in this document.
The United States Computer Emergency Response Team (US-CERT) has assigned
Vulnerability Note VU#878044 to these vulnerabilities.
Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-0960 has been
assigned to these vulnerabilities.
This advisory will be posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080610-snmpv3.shtml
CSCsf18236
With frequency stacking configured (upstreams sharing the same connector),
modems fail to register on the adjacent frequency-stacking upstream. If the
load-balance feature is also configured, modems have symptoms of being stuck in
the init(rc) state.
Workaround:
1. Unconfigure frequency stacking, and set the connector to its default setting of:
no cable upstream 0 connector 0 shared
no cable upstream 1 connector 0 shared
cable upstream 0 connector 0
cable upstream 1 connector 1
2. Restore the frequency configuration to:
cable upstream 0 connector 0 shared
cable upstream 1 connector 0 shared
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
232
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 63
Resolved Caveats for Cisco IOS Release 12.3(17b)BC3 (continued)
DDTS ID Number
Description
CSCsf28321
On a Cisco uBR series cable modem termination system (CMTS), when both
upstream and downstream cable modem load balancing is configured, modems can
be prevented from being load balanced from one downstream to another.
The issue occurs when downstreams within a common downstream load balancing
group contain many upstream load balancing groups.
Workaround: The current downstream load balancing implementation operates as
follows:
A modem will only be load balanced from a source downstream and upstream to a
target downstream if the following conditions are met:
CSCsg00622
•
The target downstream (DS) is in the same DS load balancing (LB) group as
the source downstream AND
•
The target downstream has less modems connected than the source
downstream AND
•
There is an active upstream channel on the target in the same upstream (US)
LB group as the source upstream AND that target upstream has the least
number of modems connected as compared to other potential target upstreams.
Even though the fan tray is pulled out from the chassis, the output displays:
Fan x is believed to be working
This message displays regardless of the fan tray condition.
There are no known workarounds.
Open Caveats for Release 12.3(17a)BC2
Table 64 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17a)BC1
release.
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2
DDTS ID Number
Description
CSCeb54486
A router that is running Cisco IOS Release 12.2(11)BC3 PRE A crashes due to a
bus error, but the active Performance Routing Engine (PRE) does not switchover to
PRE B.
Workaround: Do not execute the show snmp sessions command.
CSCee27341
The router experiences a software-forced crash (memory corruption in snmp) after
executing the following command:
no snmp-server host xx.xx.xx.xx public
There are no known workarounds other than not using the no snmp-server host
command.
CSCeh33888
A Cisco router reloads with the last reset from a watchdog reset.
This issue occurs on a router that has a Cisco uBR7200-NPE-G1 processor board
and is running Cisco IOS Release 12.3(9a)BC.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
233
Caveats for Cisco IOS Release 12.3 BC
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCej87157
All e911 calls are rejected if downstream (DS) bandwidth (BW) is saturated, even
though the upstream bandwidth is still available.
Workaround: Stop running applications manually to free up DS bandwidth; no
automatic DS bandwidth preemption occurs.
CSCej89390
On a Cisco uBR cable modem termination system (CMTS) platform with
MC28U/MC16U cable line cards, if a CLC interface has a bundle slave configured
on it and the interface bundle slave is brought in/out of the bundle slave
configuration, CMTS features, such as cable source-verify dhcp and cable arp,
do not work properly.
There are no known workarounds.
CSCek41538
Traceback occurs at the cable modem termination system (CMTS) when Network
Address Translation (NAT) is configured and DOCSIS Set-Top Gateway (DSG)
traffic is sent in upstream (US) and downstream (DS) directions.
There are no known workarounds.
CSCek43268
You can now delete a quality of service (QoS) profile that is being used by a cable
modem.
CSCek43887
When the src-ip field of a Confirmation to Receive (CFR) is edited, the tunnel
statistics do not get reset and retain the statistics of the previous flow.
There are no known workarounds.
CSCsa63516
The following traceback occurs during a test run, which includes maximum
concurrent active voice calls on all upstreams with data traffic injected from the
customer premises equipment (CPE) behind the cable modem:
SLOT 3/0: Feb 14 10:11:00.114 EST: %SCHED-3-STUCKMTMR: Sleep with
expired managed timer 62C7942C, time 0x31FB2BFC (00:00:00 ago).
-Process= "Dynamic Services Timer Process", ipl= 4, pid= 37
-Traceback= 60327044 6032749C 60447AE4
The traceback occurs only when the offered load (voice + data) exceeds the
maximum bandwidth available on the upstreams.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC address-based cable monitor does not
show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
234
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCsc01244
As the number of reserved Non Real Time Polling Service (nrtPS) service flows
increases on an upstream, the number of possible Voice over IP (VoIP) calls on that
upstream decreases. A direct correlation between the number of reserved nrtPS
flows and the number of possible VoIP calls is observed.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(9a)BC2 with DOCSIS 1.1 VoIP calls and an nrtPS polling interval of
250ms.
Workarounds: Enable the Low Latency Queueing scheduler for nrtPS and/or service
flows with the cable interface command: cable upstream upstream-number
scheduling type [nrtps | rtps | ugs] mode llq. This scheduler mode is available in
Cisco IOS releases 12.3(13a)BC and later.
CSCsc19010
A Gate-Set is sent to the cable modem termination system (CMTS), but no response
is received.
This issue only occurs when modifying a Gate.
There are no known workarounds.
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc69945
Cable modems connected to an MC28U style line card on a Cisco uBR7200VXR
series cable modem termination system (CMTS) become stuck in the init(d) state
after a line card recovers from an unexpected reset.
The state appears in the show cable modem command. In addition, an error
message similar to the following appears as the line card comes back online:
%PARSER-4-BADCFG: Unexpected end of configuration file.
The issue occurs only when multicast quality of service (QoS) service flows, as
configured by the cable interface command cable match address, have been
activated.
Workaround: Manually shut/no shut any affected cable interfaces.
CSCsc86355
When customer premises equipment (CPE) devices are joining and leaving
multicast groups on a bundle interface at a very fast rate, and the show interface
bundle x multicast command is issued, an alignment error or a bus error reload
occurs.
There are no known workarounds.
CSCsc95014
A Cisco router makes alignment corrections as depicted in the show align EXEC
command output.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.2(15)BC2i, however, it may be platform independent.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
235
Caveats for Cisco IOS Release 12.3 BC
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCsd10009
When the debug cable privacy command is enabled, a Cisco uBR series cable
modem termination system (CMTS) generates an error messages similar to the
following, followed by a traceback:
SLOT 5/0: Jan 18 22:12:33.320: %SCHED-2-EDISMSCRIT: Critical/high
priority process CMTS MAC Parser may not dismiss.
-Process= “CMTS MAC Parser”, ipl= 0, pid= 43
This issue stops Baseline Privacy Interface Plus (BPI+) enabled cable modems
from negotiating BPI+ encryption with the CMTS.
The issue occurs when debug is enabled and a cable modem running BPI+ tries to
come online.
Workaround: Disable the debug with the no debug cable privacy command. Use
an alternative debug that produces similar, but more verbose output, the debug
cable bpiatp command.
CSCsd22278
Call Admission Control does not take effect if it is applied while there are active
PacketCable calls running.
This issue occurs when there are bulk PacketCable calls running on the cable
modem termination system (CMTS) before you configure Call Admission Control.
Workaround: Do not configure Call Admission Control while there are bulk calls
running.
CSCsd26691
When tmda-atmda docsis mode is configured on the interface, the current reserved
value shown on the admission control command is incorrect.
This issue occurs when tdma-atdma mode is configured.
There are no known workarounds.
CSCsd30267
The Authentication, Authorization, and Accounting (AAA) per user process is
holding memory, and the router is running out of memory.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(13a)BC2 with PPP over Ethernet (PPPOE) dialing and dynamic
access control lists (ACLs).
There are no known workarounds.
CSCsd39821
The VID data in the entPhysicalHardwareRev MIB displays the wrong value if the
data field in EEPROM is missing.
This issue affects the Entity MIB in all Cisco uBR7246 software releases if the VID
data field is not programmed.
There are no known workarounds.
CSCsd39843
The entPhysicalSoftwareRev and entPhysicalMfgName MIBs for the
Cisco uBR7200-I/O-2FE/E controller card display the wrong data.
This issue affects the Entity MIB for the Cisco uBR7200 software releases.
There are no known workarounds.
CSCsd40636
The show ip vrf ? command does not display the WORD option, and the show
inventory raw ? does not display options at all.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
236
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCsd59963
The IP ToS/DSCP byte is always set to 0x00 for PacketCable CALEA replicated
packets, even when original packets have a higher value.
There are no known workarounds.
CSCsd64243
A Cisco uBR7200 router crashes due to red zone overrun - memory corruption.
There are no known workarounds.
CSCsd67935
When a Dynamic Host Configuration Protocol (DHCP) BOOTREQUEST is
received from customer premises equipment (CPE) that has a PPP over Ethernet
(PPPoE) session open with the Cisco uBR router, the PPPoE session is terminated
once the reply is GLEANed.
Workaround: Perform the following steps:
1. Configure a static IP address on the CPE.
2. Prevent the DHCP BOOTREQUEST at the CPE.
3. If DHCP scripting is possible, prevent the reply to the CPE from the server.
CSCsd75421
A router crashes because of a software forced reload - Unexpected exception, CPU
signal 23. The error SYS-6-BLKINFO: Corrupted redzone precedes the crash.
There are no known workarounds.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should return
information about all upstream bandwidth request queues on a Cisco uBR series
cable modem termination system (CMTS). However, only information about the
Committed Information Rate (CIR) and the existent Tiered Best Effort (TBE)
queue is available.
There are no known workarounds.
CSCsd84554
The not in service quality of service (QoS) profile can be enforced to the modem
using the cdxCmtsCmQosProfile MIB, but the not in service QoS profile cannot be
enforced to the modem using the CLI.
There are no known workarounds.
CSCsd85177
Randomly, signal-to-noise ration (SNR) cosmetically decreases -10 dB with
MC-28u and 16u/x cards.
Workaround: Turn off ingress-noise cancellation, and then immediately turn it back
on again. SNR returns to normal levels.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
237
Caveats for Cisco IOS Release 12.3 BC
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCsd92344
A Cisco uBR series cable modem termination system (CMTS) generates error
messages similar to the following:
%SYS-3-CPUHOG: Task is running for (2008)msecs, more than (2000)msecs
(699/198),process = DHCPD Receive.
This message is followed by another error message similar to the following and a
software-forced reload:
%UBR7200-4-FAILED_DS_SID_LOOKUP: Failed to find host in DS on int
SID # 4271, IP = 10.99.82.19, MAC = 0004.1af1.c34a
with
This issue occur s when the cable or virtual bundle interface configuration
command cable source-verify dhcp is configured, and is triggered by end hosts
that have duplicate or spoofed Ethernet MAC addresses.
Workaround: Remove the dhcp portion of the cable source-verify dhcp command
and use the cable source-verify command only.
CSCse05680
Cable modem termination system (CMTS) read-only quality of service (QoS)
profiles are being deleted.
This issue occurs in platforms without distributed line cards.
There are no known workarounds.
CSCse06619
When changing a bundle member from one bundle to another, the service class
information is not displayed in the show cable dsg tunnel no statistics command.
There are no known workarounds.
CSCse11646
Spurious memory access occurs when monitoring MAC packets with the DOCSIS
Set-Top Gateway (DSG) configuration.
There are no known workarounds.
CSCse14247
The cable quality of service (QoS) profile created using the cdxCmtsCmQosProfile
MIB can be modified or deleted when the profile is active and in use by modems.
There are no known workarounds.
CSCse30830
After a Simple Network Management Protocol (SNMP) request on the cable
modem termination system (CMTS), there is steady packet loss on the upstream
(modem-to-voice gateway) path. Even though the SNMP requests are stopped and
the SNMP lines are removed (using config mode) from the running configuration,
the packet loss status remains until a reload of CMTS occurs.
Workaround: Perform a CMTS reload.
CSCse32100
Performance measurements run as best effort traffic (the only traffic in the setup)
in short sessions (of 60 seconds long each) report that sometimes the upstream (US)
throughput is lower than expected. The performance hits do not seem to follow any
particular pattern, but are accompanied by a rapid increase of drops in the MAC
scheduler. When the performance is as expected, the drops in the MAC scheduler
do not increase.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
238
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Caveats for Cisco IOS Release 12.3 BC
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCse33368
The router reloads and comes back up with following message:
Last reset from watchdog nmi System was restarted by watchdog timer
expired
Decoded information appears as etext for all the values, which points to possible
corrupted crash information.
There are no known workarounds.
CSCse37931
The cable source verify leasequery-filter does not working with bundling.
There are no known workarounds.
CSCse53584
The show cable calls command is missing from the IOS documentation.
There are no known workarounds.
CSCse56861
A Cisco uBR series router displays the following error message after the cable
source-verify dhcp command has been configured:
%ALIGN-3-SPURIOUS: Spurious memory access made at [...]
There are no known workarounds.
CSCse60253
When a cable filter group is configured to block traffic to a cable modem (CM),
Media Terminal Adapter (MTA), or customer premises equipment (CPE), the
traffic towards devices on an MC16C line card do not get blocked by the cable
modem termination system (CMTS).
Workaround: If you move the devices to the MC28U line card, the feature works.
CSCse68483
Unusual characters (parser issued) are generated on the terminal output (console or
Telnet session).
This issue occurs only when the cable modem termination system (CMTS) is
configured with the Baseline Privacy Interface (BPI) and the debug cable privacy
command is enabled on a non-Cisco cable modem.
Workaround: Turn off the debug, disconnect the session, and re-connect.
CSCse70718
On a Cisco uBR series cable modem termination system (CMTS), cable modems
on an MC28U series cable line card are unable to progress past the init(d) state on
certain upstream ports.
The issue occurs after an MC28U cable line card has undergone online insertion
and removal (OIR), or after the MC28U line card is unexpectedly reset. The issue
also occurs only when upstream connector sharing is configured. Cable modems on
the numerically lowest upstream channel to share a connector can get stuck in the
init(d) state.
Workaround: Reconfigure the connector sharing configuration command on
affected upstreams after the line card OIR.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
239
Caveats for Cisco IOS Release 12.3 BC
Table 64
Open Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCse74143
The following error message can lead to a cable modem termination system
(CMTS) software crash due to memory corruption:
Jul 10 19:30:09.830: %SYS-2-LINKED: Bad enqueue of 643D0780 in queue
6321038C
-Process= "CMTS SID mgmt task", ipl= 3, pid= 47
-Traceback= 60893900 604BD1C4 6053358C 604D894C 60617EB8 608576BC
608576A0
Jul 10 19:30:40.721: %SYS-2-NOTQ: unqueue didn't find 64400518 in queue
63325B14
-Process= "CMTS SID mgmt task", ipl= 3, pid= 47
-Traceback= 60893B08 604BD104 604D74DC 6061818C 608576BC 608576A0
Jul 10 19:30:46.253: %SYS-2-NOTQ: unqueue didn't find 643D0780 in queue
6321038C
-Process= "CMTS SID mgmt task", ipl= 3, pid= 47
-Traceback= 60893B08 604BD104 604D74DC 6061818C 608576BC 608576A0
Jul 10 19:30:53.001: %SYS-2-LINKED: Bad enqueue of 643D0780 in queue
6321038C
-Process= "CMTS SID mgmt task", ipl= 3, pid= 47
-Traceback= 60893900 604BD1C4 6053358C 604D894C 60617EB8 608576BC
608576A0
There are no known workarounds.
CSCse77050
On a Cisco uBR series cable modem termination system (CMTS), the defaults for
the cable upstream us-channel admission-control percentage command have
changed from enforcing over subscription to 100% of the available upstream
bandwidth to not enforcing any over subscription level. In addition, if the cable
upstream us-channel admission-control 100 command is configured, the
command will not be properly saved and will not be maintained after a CMTS
reload.
Workaround: If upstream channel over subscription enforcement for minimum
reserved rate services is desired at 100% of upstream bandwidth, then manually
configure a slightly different value. For example: cable upstream us-channel
admission-control 99.
CSCse78507
Packets are delayed at the cable interface if rate-limiting is used
Workaround: Remove the cable downstream rate-limit token-bucket shaping
max-delay command.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
240
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(17a)BC2
Table 65 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17a)BC2
release.
Table 65
Resolved Caveats for Cisco IOS Release 12.3(17a)BC2
DDTS ID Number
Description
CSCek37177
The Cisco IOS Transmission Control Protocol (TCP) listener in certain versions of
Cisco IOS software is vulnerable to a remotely-exploitable memory leak that may
lead to a denial of service condition.
This vulnerability only applies to traffic destined to the Cisco IOS device. Traffic
transiting the Cisco IOS device will not trigger this vulnerability.
Cisco has made free software available to address this vulnerability for affected
customers.
This issue is documented as Cisco bug ID CSCek37177.
There are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
CSCek48821
Modems do not come online with the MC28U card.
There are no known workarounds.
CSCsc27292
Integrated customer premises equipment (CPE) inside of certain brands of cable
modems and set-top box units are unable to acquire an IP address using the
Cisco uBR cable modem termination system (CMTS).
The issue occurs when cable interface bundling is configured on
Cisco IOS Release 12.3(13a)BC, but not in earlier Cisco IOS releases.
Workaround: Revert to an earlier release of Cisco IOS for the Cisco uBR CMTS,
or unconfigure cable interface bundling.
CSCsd30319
Modems get stuck in the init(o) state following an online insertion and removal
(OIR) operation if the replacement card type is not identical to the original card.
This issue is related to virtual interface bundling, and only occurs on interfaces that
are members of a cable bundle.
Workaround: Reboot the router.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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241
Caveats for Cisco IOS Release 12.3 BC
Table 65
Resolved Caveats for Cisco IOS Release 12.3(17a)BC2 (continued)
DDTS ID Number
Description
CSCsd41688
The MC28U and MC16U line cards experience an Inter-Process Communication
online insertion and removal (IPCOIR) timeout and reload without writing a
crashinfo file in bootflash. An %IPCOIR-3-TIMEOUT message is displayed on the
Network Processing Engine (NPE) console and the line card is reloaded
approximately 5 minutes later.
To check for the presence of a crashinfo file connect to the line card, enter the
if-con command, and then enter the show bootflash all command. If the line card
is experiencing this problem, the command does not list a crashinfo file with a
timestamp corresponding to the reload.
This problem does not normally reoccur on the same card.
There are no known workarounds.
CSCse22002
The billing record format has been changed despite the IP Detail Record (IPDR)
specification not supporting that new format as of May 2006.
The image tries to complies with the latest 2.0 spec based on
OSSIv2.0-N-04.0173-7 ECR,
http://www.cablemodem.com/downloads/specs/CM-SP-OSSIv2.0-I09-050812.pdf
, which states: " This Element is defined as compliant with [IPDR/BSR]
specification but [IPDR/SP] still does not define those types, therefore CPE Info
MUST NOT be supported until [IPDR/SP] defines Array and Structs types."
Workaround: Customers must support the new schema, DOCSIS-3.5.1-A.0.xsd.
Open Caveats for Release 12.3(17a)BC1
Table 66 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17a)BC1
release.
Table 66
Open Caveats for Cisco IOS Release 12.3(17a)BC1
DDTS ID Number
Description
CSCeh33888
A Cisco uBR7246VXR reloads with the last reset from a watchdog reset.
This issue occurs on a router that has a Cisco uBR7200-NPE-G1 processor board
and is running Cisco IOS Release 12.3(9a)BC.
There are no known workarounds.
CSCei25309
The cable monitor & MC16C card does not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
service identifier (SID) option and map-grant.
There are no known workarounds.
CSCej87157
All e911 calls are rejected if downstream (DS) bandwidth (BW) is saturated, even
though upstream bandwidth is still available.
Workaround: Stop running applications manually to free up DS bandwidth; no
automatic DS bandwidth preemption occurs.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
242
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 66
Open Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
DDTS ID Number
Description
CSCej89390
On a Cisco uBR cable modem termination system (CMTS) platform with
MC28U/MC16U cable line cards, if a CLC interface has a bundle slave configured
on it and the interface bundle slave is brought in/out of the bundle slave
configuration, CMTS features, such as cable source-verify dhcp and cable arp,
do not work properly.
There are no known workarounds.
CSCek41072
In Cisco IOS releases for the Cisco uBR7200 router in which CSCed17434 is fixed,
the functionality of the cable source-verify dhcp command has changed.
Before CSCed17434, the command would try to validate IP source addresses from
systems behind routers connected to the DOCSIS network. After CSCed17434, the
command no longer performs this validation. Instead, if the source address of a
packet is recognized as not being directly connected to the DOCSIS network, the
router will simply omit source address checking and accept/forward the packet. If
debugging is enabled, it emits a message similar to the following:
src address 1.2.3.4 on subnet different from interface Cable3/0, no
checking
Note that this message is the only debug generated and is independent of whether
the IP source address of the offending packet is actually a spoofed address (not
reachable via the cable interface), or whether it is an IP address reachable via some
CPE-side router connected to this interface.
Workaround: To enable source address checking for a non-directly connect
source-IP address in Cisco IOS releases for the Cisco uBR7200 router in which
CSCed17434 is fixed, enable the following commands:
Interface:
! Global
cable source-verify [dhcp]
ip cef
! On each cable interface IP CEF based RPF check:
interface Cable 3/0
ip verify unicast source reachable-via rx
Note
If you need address security on your DOCSIS network, enable the interface
level IP Cisco Express Forwarding (CEF) based Reverse Path Forwarding
(RPF) checking whether or not you want to support subscribers with
routers.
Limitations: Note that even with the above described workaround, there is no
validation whether packets with a non-directly connected source-IP address are
received via the appropriate cable modem.
For example, if an attacking subscriber A knows that a particular IP address prefix
A/M is connected via a router at another subscriber’s site connected to the same
downstream, then subscriber A can spoof packets with that source’s IP addresses
and neither the cable source-verify command, nor the ip verify unicast source
reachable-via rx command will be able to inhibit this attack.
Unicast Forwarding Information Base (FIB) RPF checking is supported by the ip
verify unicast source command. To provide protection against this case, a
Cisco IOS release needs to provide support for CSCek41068.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
243
Caveats for Cisco IOS Release 12.3 BC
Table 66
Open Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
DDTS ID Number
Description
CSCsa63516
The following traceback occurs during a test run, which includes maximum
concurrent active voice calls on all upstreams with data traffic injected from the
customer premises equipment (CPE) behind the cable modem:
SLOT 3/0: Feb 14 10:11:00.114 EST: %SCHED-3-STUCKMTMR: Sleep with
expired managed timer 62C7942C, time 0x31FB2BFC (00:00:00 ago).
-Process= "Dynamic Services Timer Process", ipl= 4, pid= 37
-Traceback= 60327044 6032749C 60447AE4
The traceback occurs only when the offered load (voice + data) exceeds the
maximum bandwidth available on the upstreams.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC address based cable monitor does not
show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsb30270
A Cisco uBR7200VXR router with MC28U style line cards has an internal
127.x.x.x network that is used for inter line card communication.
This network is errantly advertised by IP routing protocols when the redistribute
connected [subnets] command is specified under the routing protocol’s
configuration paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands achieve this goal for an Open Shortest Path First (OSPF)
process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
244
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Caveats for Cisco IOS Release 12.3 BC
Table 66
Open Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
DDTS ID Number
Description
CSCsb63042
The current implementation of ToS overwrite requires that static cable quality of
service (QoS) profiles be created and the necessary tos-overwrite command added
to achieve the desired packet coloring.
This implementation works well if only a few different service types are offered.
Scalability problems arise when multiple service operators (MSOs) offer dozens of
different service levels, each requiring a static QoS profile to perform ToS
overwrite.
A feature that would allow a default ToS overwrite to be bound to cable modem
(CM) created profiles would help eliminate the scalability problem. Such a feature
would be limited in that all CM created profiles would be forced to use the same
ToS setting.
There are no known workarounds.
CSCsc01244
As the number of reserved Non Real Time Polling Service (nrtPS) service flows
increases on an upstream, the number of possible Voice over IP (VoIP) calls on that
upstream decreases.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(9a)BC2 with DOCSIS 1.1 VoIP calls and nrtPS polling interval of
250ms.
There are no known workarounds.
CSCsc10117
When a cable modem termination system (CMTS) bundle interface has 100,000
Address Resolution Protocol (ARP) entries, entering the interface configuration
mode of that bundle hogs the CPU for 15-20 seconds.
This issue occurs when the bundle interface has a large number of entries in the
ARP and Forwarding Information Base (FIB) tables.
Workaround: Enter the bundle interface configuration mode during a maintenance
window, or split one large bundle into several smaller bundles.
CSCsc19010
A Gate-Set is sent to the cable modem termination system (CMTS), but no response
is received.
This issue occurs when modifying a Gate.
There are no known workarounds.
CSCsc27292
Integrated customer premises equipment (CPE) inside of certain brands of cable
modems and set-top box units are unable to acquire an IP address using the
Cisco uBR cable modem termination system (CMTS).
The issue occurs when cable interface bundling is configured on Cisco IOS
Release 12.3(13a)BC, but not in earlier Cisco IOS releases.
Workaround: Revert to an earlier release of Cisco IOS for the Cisco uBR CMTS,
or unconfigure cable interface bundling.
CSCsc27520
When the Network Time Protocol (NTP) clock gets updated, the clock on the
Performance Routing Engine (PRE) changes as expected, however, the MC520
clock does not get updated.
Workaround: Restart the CMTS or the line card.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
245
Caveats for Cisco IOS Release 12.3 BC
Table 66
Open Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
DDTS ID Number
Description
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc69945
Cable modems connected to an MC28U style line card on a Cisco uBR7200VXR
series cable modem termination system (CMTS) become stuck in the init(d) state
after a line card recovers from an unexpected reset.
The state appears in the show cable modem command. In addition, an error
message similar to the following appears as the line card comes back online:
%PARSER-4-BADCFG: Unexpected end of configuration file.
The issue occurs only when multicast quality of service (QoS) service flows, as
configured by the cable interface command cable match address, have been
activated.
Workaround: Manually shut/no shut any affected cable interfaces.
CSCsc73808
Source is ignored when SSM-mapping with a non-ssmp group is configured.
There are no known workarounds.
CSCsc86355
When customer premises equipment (CPE) is joining and leaving multicast groups
on a bundle interface at a very fast rate, and the show interface bundle x multicast
command is issued, an alignment error or a bus error reload occurs.
There are no known workarounds.
CSCsc99552
Unnecessary crypto information is printed out in the running-config.
This occurs when Baseline Privacy Interface Plus (BPI+) is configured and is being
used on the cable modem termination system (CMTS).
Workaround: Use the show running-config brief command to avoid this
information.
CSCsd10009
When the debug cable privacy command is enabled, a Cisco uBR series cable
modem termination system (CMTS) generates error messages similar to the
following, followed by traceback:
SLOT 5/0: Jan 18 22:12:33.320: %SCHED-2-EDISMSCRIT: Critical/high
priority process CMTS MAC Parser may not dismiss.
-Process= “CMTS MAC Parser”, ipl= 0, pid= 43
This issue stops Baseline Privacy Interface Plus (BPI+) enabled cable modems
from negotiating BPI+ encryption with the CMTS.
The issue occurs when debug is enabled and a cable modem running BPI+ tries to
come online.
Workaround: Disable the debug with the no debug cable privacy command. Use
an alternative debug command that produces similar, but more verbose output, the
debug cable bpiatp command.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
246
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 66
Open Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
DDTS ID Number
Description
CSCsd14049
A feature request has been made for better fixed frequency support with advanced
spectrum management for advanced Physical Interface Chip (PHY) CLCs such as
the MC28U and 5x20U.
At present, the band command must be used, even if a fixed frequency is desired:
Router(config)# cable spectrum-group 15 band 6000000 9200000
Router(config)# interface cable 6/0
Router(config-if)# cable upstream 0 spectrum-group 15
There are no known workarounds.
CSCsd23426
Cable modems using non-real time polling service flows with a 300ms polling
interval are not allowed to register with the cable modem termination system
(CMTS). The output generated by the show cable modem command is reject(c).
Workaround: Use a polling interval that is not 300ms. For example, 250ms has been
tested and works.
CSCsd30319
Modems get stuck in the init(o) state following an online insertion and removal
(OIR) operation if the replacement card type is not identical to the original card.
This issue is related to virtual interface bundling, and occurs only on interfaces that
are members of a cable bundle.
Workaround: Reboot the router.
CSCsd39821
The VID data in the entPhysicalHardwareRev MIB displays the wrong value if the
data field in EEPROM is missing.
This issue affects the Entity MIB in all Cisco uBR7246 software releases if the VID
data field is not programmed.
There are no known workarounds.
CSCsd39843
The entPhysicalSoftwareRev and entPhysicalMfgName MIBs for the
Cisco uBR7200-I/O-2FE/E controller card display the wrong data.
This issue affects the Entity MIB for the Cisco uBR7200 software releases.
There are no known workarounds.
CSCsd40636
The show ip vrf ? command does not display the WORD option, and the show
inventory raw ? does not display options at all.
There are no known workarounds.
CSCsd59963
The IP ToS/DSCP byte is always set to 0x00 for PacketCable CALEA replicated
packets, even when the original packets have a higher value.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
247
Caveats for Cisco IOS Release 12.3 BC
Table 66
Open Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
DDTS ID Number
Description
CSCsd67935
When a Dynamic Host Configuration Protocol (DHCP) BOOTREQUEST is
received from customer premises equipment (CPE) that has a PPP over Ethernet
(PPPoE) session open with the Cisco uBR router, the PPPoE session is terminated
once the reply is GLEANed.
This issue occurs when the DHCP BOOTREPLY needs to be GLEANed for a CPE
that has a PPPoE session.
Workaround: Perform the following steps:
1. Configure a static IP address on the CPE.
2. Prevent the DHCP BOOTREQUEST at the CPE.
3. If DHCP scripting is possible, prevent the reply to the CPE from the server.
CSCsd80421
The cdxBWQueueTable and cdxBWQueueEntry MIB variables should return
information about all upstream bandwidth request queues on a Cisco uBR series
cable modem termination system (CMTS). However, only information about the
Committed Information Rate (CIR) and the existent Tiered Best Effort (TBE)
queue is available.
There are no known workarounds.
CSCsd92344
A Cisco uBR7200 series cable modem termination system (CMTS) generates error
messages similar to the following:
%SYS-3-CPUHOG: Task is running for (2008)msecs, more than (2000)msecs
(699/198),process = DHCPD Receive.
This message can be followed by another error message similar to the following
and a software-forced reload:
%UBR7200-4-FAILED_DS_SID_LOOKUP: Failed to find host in DS on int
SID # 4271, IP = 10.99.82.19, MAC = 0004.1af1.c34a
with
This issue occurs when the cable or virtual bundle interface configuration cable
source-verify dhcp command is configured, and is triggered by end hosts that have
duplicate or spoofed Ethernet MAC addresses.
Workaround: Remove the dhcp portion of the cable source-verify dhcp command,
and use the cable source-verify command only.
CSCse05680
Cable modem termination system (CMTS) read-only quality of service (QoS)
profiles are being deleted.
This issue occurs in platforms without distributed line cards
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
248
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(17a)BC1
Table 67 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17a)BC1
release.
Table 67
CSCek26121
Resolved Caveats for Cisco IOS Release 12.3(17a)BC1
The sysUptime SNMP OID counter is reset after a Performance Routing Engine
(PRE) switchover occurs.
There are no known workarounds.
CSCek27197
With Dynamic Shared Secret (DMIC) enabled, modems get stuck in the init(io)
state and fail to register.
This issue occurs when Dynamic Shared Secret is enabled, and most, if not ALL,
of the following conditions are true:
•
Each modem gets its own config file (for example, when BACC is used for
provisioning)
•
The cable modem (CM) config files are large (greater than 1024 bytes in size)
•
Large numbers of modems are trying to connect to the cable modem
termination system (CMTS)
There are no known workarounds.
CSCsa92748
A Network Processing Engine G1 (NPE-G1) restarts unexpectedly and reports the
following message:
Last reset from watchdog reset
This issue occurs only on Cisco 7200 and Cisco 7301 series routers that are
configured with an NPE-G1 Network Processing Engine.
There are no known workarounds.
CSCsb25448
A Cisco uBR7246VXR router unexpectedly reloads.
There are no known workarounds.
CSCsb84207
Clone cable modems take legitimate modems offline.
There are no known workarounds.
CSCsc86473
High forward error correction (FEC) counts occur on a Cisco uBR7200 cable
modem termination system (CMTS) for attached cable modems, and those cable
modems are unable to come online.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(9a)BC3 ubr7200clc-lck8-mz software equipped with MC28U cards
and connected to a high number (2000 to 3000) of cable modems. The errors are
related to specific third party cable modems
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
249
Caveats for Cisco IOS Release 12.3 BC
Table 67
CSCek26121
Resolved Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
The sysUptime SNMP OID counter is reset after a Performance Routing Engine
(PRE) switchover occurs.
There are no known workarounds.
CSCsd15546
A Cisco router configured as a Dynamic Host Configuration Protocol (DHCP)
relay does not append Option 82 (Relay Agent Option), even when configured to
do so:
ip dhcp relay information option
no ip dhcp relay information check
ip dhcp relay information trust-all
This issue occurs when the DHCP message contains an invalid option (for example,
option 12 with length 0.)
Workaround: Ensure that the DHCP messages sent to the Cisco router that is acting
as DHCP relay contain valid options.
CSCsd15937
On voice systems, the following occurs:
•
The clear cable modem mac delete command leads to a software-forced
reload.
•
Any cable modem (CM) going offline, for any reason, leads to a
software-forced reload.
•
Aborted DSX transactions lead to a software-forced reload.
•
A Dynamic Service Deletion (DSD) message leads to a software-forced reload.
This issue affects Cisco IOS Releases 12.2(15)BC2h, 12.3(13)BC1 and
12.3(13)BC2.
The cable modem (CM) initiates overlapping Dynamic Service Change (DSC)
transactions, drops DSC ACKs, and does not hold down state of previous
transaction. The classifier state is modified during several transactions that overlap
DSX error handling, creating a classifier with a state that does not match the list
that it is on, or creating duplicate classifier pointers on the same list. Subsequent
state changes, followed by DSC delete, DSD, or CM offline, cause a double free of
the classifier pointer, resulting in a software-forced reload.
Workaround: A debug image is available that avoids the software-forced reload and
provides additional debugging information.
CSCsd16035
Configured traps for cable and docsis-cmts disable as soon as another trap is
configured.
This issue occurs on Cisco IOS Release 12.3(9a)BC6.
Workaround: Configure cable and docsis-cmts traps last.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Table 67
CSCek26121
Resolved Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
The sysUptime SNMP OID counter is reset after a Performance Routing Engine
(PRE) switchover occurs.
There are no known workarounds.
CSCsd17301
When Dynamic Shared Secret (DMIC) is configured on the cable modem
termination system (CMTS), the CMTS enters a state where all subsequent cable
modem (CM) registration attempts fail and the CM ends up in the init(io) state.
Cable modems that are online continue to work, but any other cable modems that
are reset, either by means of power-cycling or by the delete/reset command, fail.
This issue occurs if the multiple service operator (MSO) mistakenly provisions a
modem config file that does not exist on the Trivial File Transfer Protocol (TFTP)
server, and any modem tries to get online with the CMTS using such a non-existent
config file.
There are no known workarounds.
CSCsd20135
On voice systems, the following occurs:
•
The clear cable modem mac delete command leads to a software-forced
reload.
•
Any cable modem (CM) going offline, for any reason, leads to a
software-forced reload.
•
Aborted DSX transactions lead to a software-forced reload.
•
A Dynamic Service Deletion (DSD) message leads to a software-forced reload.
This issue affects Cisco IOS Releases 12.2(15)BC2h, 12.3(13)BC1 and
12.3(13)BC2.
The CM initiates overlapping Dynamic Service Change (DSC) transactions, drops
DSC ACKs, and does not hold down state of previous transaction. The classifier
state is modified during several transactions that overlap DSX error handling,
possibly creating duplicate classifier pointers on the same list. Subsequent state
changes, followed by DSC delete, DSD, or CM offline, cause a double free of the
classifier pointer, resulting in a software-forced reload.
Workaround: A debug image is available that avoids the software-forced reload and
provides additional debugging information.
CSCsd20814
MC28Us add additional leading byte(s) to the data payload portion of a cable
intercept packet where the source MAC address of the original packet is expected.
Most recreate attempts show the addition of only a single extra byte. However,
there have been cases where more than 1 extra byte was added.
Other observations are as follows:
•
The problem seems to be intermittent on MC28Us CLCs. Other MC28U
interfaces may or may not have the problem.
•
Problem could not be reproduced on legacy CLCs, such as the MC16S card.
•
Problem was duplicated in the lab on Cisco IOS Release 12.3(13a)BC2;
Cisco IOS Release 12.3(9a)x is affected as well.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Table 67
CSCek26121
Resolved Caveats for Cisco IOS Release 12.3(17a)BC1 (continued)
The sysUptime SNMP OID counter is reset after a Performance Routing Engine
(PRE) switchover occurs.
There are no known workarounds.
CSCsd22348
A Cisco uBR7246VXR router running the following experimental image,
experiences a bus error crash at cmts_rx_pdu_common.
There are no known workarounds.
CSCsd22949
The Ethernet port adapter does not have the MAC address for Open Shortest Path
First (OSPF) in its MAC-filter after a reboot. This issue prevents OSPF adjacencies
from establishing.
This issue occurs on a Cisco uBR7246VXR router running Cisco IOS
Release 12.3(13a)BC1 with a dot1q subinterface on a port-channel containing
Gigabit Ethernet interfaces on the Cisco uBR7200-NPE-G1 enabled for OSPF.
Workaround: This issue can be fixed by a manual shut/no shut of the port-channel.
CSCsd42802
Modems are not coming up on the MC28u line cards in certain Virtual Interface
configurations.
After configuring DS0 with US0 on connector 7, modems will not come up.
Workaround: Do not create US0 connections using connector 7.
Note
CSCsd47337
Note: Default connector for US0 is connector 0.
The cable service flow inactivity-threshold command does not get written to
running-config or startup-config.
This issue affects the Cisco IOS Release 12.3(17a) only.
Workaround: Re-enter the command after the cable modem termination system
(CMTS) boots up.
CSCsd84940
For Cisco IOS releases 12.3(17a)BC, 12.3(13)BC1, 12.3(13)BC2, 12.3(9a)BC8, a
significant increase in the number of upstream forward error correction (FEC)
errors occurs when using MC16C or MC28C cards.
The exact degradation that occurs (if any) depends upon plant conditions and the
cable modems (CMs) and Media Terminal Adapters (MTAs) being used.
There are no known workarounds.
CSCek26121
The sysUptime SNMP OID counter is reset after a Performance Routing Engine
(PRE) switchover occurs.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(17a)BC
Table 68 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17a)BC
release.
Table 68
Open Caveats for Cisco IOS Release 12.3(17a)BC
DDTS ID Number
Description
CSCeh33888
A Cisco router reloads with the last reset from the watchdog reset.
This issue occurs on a router that has a Cisco uBR7200-NPE-G1 processor board
and is running Cisco IOS Release 12.3(9a)BC.
There are no known workarounds.
CSCei25309
The cable monitor and MC16C card does not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
service identifier (SID) option and map-grant.
There are no known workarounds.
CSCej89390
On a Cisco uBR cable modem termination system (CMTS) platform with
MC28U/MC16U cable line cards, if a CLC interface has a bundle slave configured,
and the interface bundle slave is brought in/out of the bundle slave configuration,
CMTS features, such as cable source-verify dhcp and cable arp, do not work
properly.
There are no known workarounds.
CSCek26121
The sysUptime SNMP OID counter resets after a Performance Routing Engine
(PRE) switchover occurs.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC address based cable monitor does not
show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth that is exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet while
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Table 68
Open Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsb30270
The Cisco uBR7200VXR router with MC28U style line cards has an internal
127.x.x.x network that is used for inter line card communication.
This network is errantly advertised by IP routing protocols when the redistribute
connected [subnets] command is specified under the routing protocol’s
configuration paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands will achieve this goal for an Open Shortest Path First
(OSPF) process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
CSCsb52587
A Cisco uBR7200 router running Cisco IOS Release 12.3(9a)BC unexpectedly
reloads due to a bus error under rare conditions.
There are no known workarounds.
CSCsb61414
When running Cisco IOS Release 12.3(9a)BC3 or 12.3 (9a)BC6 on a
Cisco uBR7246VXR router, sporadically, the cable modem termination system
(CMTS) cannot ping some of the cable modems and customer premises equipment
(CPE) behind the modem. This problem does not occur with Cisco IOS
Release 12.3(9a)BC.
Cable monitor traces recorded while the failure is present show no input packets on
the CMTS from affected cable modems.
This issue occurs on CMTS with approximately 3000 cable modems online.
Workaround: Reset the cable modem.
CSCsc01244
As the number of reserved Non Real Time Polling Service (nrtPS) service flows
increases on an upstream, the number of possible Voice over IP (VoIP) calls on that
upstream decreases.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(9a)BC2 with DOCSIS 1.1 VoIP calls and an nrtPS polling interval of
250ms.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Table 68
Open Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsc10117
When a cable modem termination system (CMTS) bundle interface has 100,000
Address Resolution Protocol (ARP) entries, entering the interface configuration
mode of that bundle hogs the CPU for 15-20 seconds.
This issue occurs when the bundle interface has a large number of entries in the
ARP and Forwarding Information Base (FIB) tables.
Workaround: Enter bundle interface configuration mode during a maintenance
window, or split one large bundle into several smaller bundles.
CSCsc16702
NPE-G1 unexpectedly reloads with a bus error when running Cisco IOS
Release 12.2(15)BC2h during normal operation.
There are no known workarounds.
CSCsc19010
A Gate-Set is sent to the cable modem termination system (CMTS), but no response
is received.
This issue occurs only when modifying a Gate.
There are no known workarounds.
CSCsc27292
Integrated customer premises equipment (CPE) inside of certain brands of cable
modems and set-top box units are unable to acquire an IP address using the
Cisco uBR cable modem termination system (CMTS).
The issue occurs when cable interface bundling is configured on Cisco IOS
Release 12.3(13a)BC, but not in earlier Cisco IOS releases.
Workaround: Revert to an earlier release of Cisco IOS for the Cisco uBR CMTS,
or unconfigure cable interface bundling.
CSCsc27520
When the Network Time Protocol (NTP) clock gets updated, the clock on the
Performance Routing Engine (PRE) changes as expected, however, the MC520
clock does not get updated.
Workaround: Restart the cable modem termination system (CMTS) or the line card.
CSCsc63687
On a Cisco uBR series cable modem termination system (CMTS), when service
flows are generated for multicast traffic through the use of the cable and bundle
interface cable match address command, the docsQosMIBObjects Simple
Network Management Protocol (SNMP) objects do not report details of the
multicast service flows.
Workaround: Revert to the use of the Cisco IOS Command Line Interface to gather
statistics on multicast service flows.
CSCsc69945
Cable modems connected to an MC28U style line card on a Cisco uBR7200VXR
series cable modem termination system (CMTS) become stuck in the init(d) state
after a line card recovers from an unexpected reset.
The state appears in the show cable modem command. In addition, an error
message similar to the following appears as the line card comes back online:
%PARSER-4-BADCFG: Unexpected end of configuration file.
The issue occurs only when multicast quality of service (QoS) service flows, as
configured by the cable interface cable match address command, have been
activated.
Workaround: Manually shut/no shut any affected cable interfaces.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 68
Open Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsc73808
The source is ignored when configuring SSM-mapping with a non-ssmp group.
There are no known workarounds.
CSCsc84934
When the sflog entries are less than the terminated SFs, the terminated SFs which
were logged by the sflog file in the cable modem termination system (CMTS), are
not reported in the XML file.
Workaround: Perform the following steps:
1. Make the sflog entries to 2, and enable cable metering in file system mode.
2. Reload the router.
3. After the reload, terminate the 4 SFs.
4. Do the metering.
5. Verify the XML file.
CSCsc86355
When customer premises equipment (CPE) is joining and leaving multicast groups
on a bundle interface at a very fast rate and the show interface bundle x multicast
command is issued, an alignment error or a bus error reload occurs.
There are no known workarounds.
CSCsc86473
High forward error correction (FEC) counts occur on a Cisco uBR7200 cable
modem termination system (CMTS) for attached cable modems. These cable
modems are unable to come online.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(9a)BC3 ubr7200clc-lck8-mz software equipped with MC28U cards
and connected to a high number (2000 to 3000) of cable modems. The errors are
related to specific third party cable modems
There are no known workarounds.
CSCsc87614
All of the cable modems on an MC16 modem card for a Cisco uBR7200 router
suddenly go offline.
Workaround: Use the shut/no shut command on the cable interface.
CSCsc91170
When the clear cable modem cm delete command is entered, an unexpected reload
occurs.
This issue occurs in Cisco IOS Release 12.2(15)BC2h and 12.3(13)BC1.
Workaround: A debug image is available, which provides more debugging
information and may avoid the unexpected reload.
CSCsc99552
Unnecessary crypto information is printed out in the running-config.
This issue occurs when Baseline Privacy Interface Plus (BPI+) is configured and is
being used on the cable modem termination system (CMTS).
Workaround: Use the show running-config brief command to avoid this
information.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 68
Open Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsd02882
When performing snmpwalk on the docsIfCmtsServiceNewCmStatusIndex, the
returned values fail to return branches/values for certain interfaces (ifIndexes).
This issue appears to occur only when MC28u is used.
Workaround: Set the Snmpwalk docsIfCmtsServiceNewCmStatusIndex.ifIndex
directly. For example, if ifIndex = 2 is missing from the tree, enter
snmpwalkl.1.3.6.1.2.1.10.127.1.3.4.1.8.2.
CSCsd07509
Event throttling does not work and traps and syslogs are not limited to values set
by the docsDevEvThrottleThreshold. All the traps and syslogs generated are
delivered.
For example, if MIBs are set as follows, then no more than 10 traps/syslogs should
be delivered in 60 seconds, but instead, all the traps/syslogs are delivered:
docsDevEvThrottleThreshold - 10
docsDevEvThrottleInterval - 60
docsDevEvThrottleAdminStatus.0 -
2
There are no known workarounds.
CSCsd10009
When the debug cable privacy command is enabled, a Cisco uBR series cable
modem termination system (CMTS) generates error messages similar to the
following, followed by traceback:
SLOT 5/0: Jan 18 22:12:33.320: %SCHED-2-EDISMSCRIT: Critical/high
priority process CMTS MAC Parser may not dismiss.
-Process= “CMTS MAC Parser”, ipl= 0, pid= 43
This issue stops Baseline Privacy Interface Plus (BPI+) enabled cable modems
from negotiating BPI+ encryption with the CMTS. The issue occurs when debug is
enabled and a cable modem running BPI+ tries to come online.
Workaround: Disable the debug with the no debug cable privacy command. Use
an alternative debug command that produces similar, but more verbose output, the
debug cable bpiatp command.
CSCsd14049
A request has been made for better fixed frequency support with advanced
spectrum management for advanced Physical Interface Chip (PHY) CLCs such as
the MC28U and 5x20U.
At present, the band command must be used, even if a fixed frequency is desired:
Router(config)# cable spectrum-group 15 band 6000000 9200000
Router(config)# interface cable 6/0
Router(config-if)# cable upstream 0 spectrum-group 15
There are no known workarounds.
CSCsd20814
MC28Us add one or more leading byte(s) to the data payload portion of a cable
intercept packet, where the source MAC address of the original packet is expected.
This issue is intermittent on MC28Us CLCs. Other MC28U interfaces may or may
not have the problem.
The issue occurs in Cisco IOS Release 12.3(13a)BC2, but Cisco IOS
Release 12.3(9a)x is affected also.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 68
Open Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsd22348
A Cisco uBR7246VXR router that is running the following experimental image
experiences a bus error crash at cmts_rx_pdu_common.
There are no known workarounds.
CSCsd22949
The Ethernet port adapter does not have the MAC address for Open Shortest Path
First (OSPF) in its MAC-filter after a reboot. This prevents OSPF adjacencies from
establishing.
This issue occurs on a Cisco uBR7246VXR router running Cisco IOS
Release 12.3(13a)BC1 with a dot1q subinterface on a port-channel containing
Gigabit Ethernet interfaces on the Cisco uBR7200-NPE-G1 enabled for OSPF.
Workaround: Manually shut/no shut the Port-Channel.
CSCsd23426
Cable modems using non-real time polling service flows with a 300ms polling
interval are not allowed to register with the cable modem termination system
(CMTS). The output generated by the show cable modem command is reject(c).
Workaround: Use a polling interval that is not 300ms. For example, 250ms has been
tested and works.
CSCsd30319
Modems get stuck in the init(o) state following an online insertion and removal
(OIR) operation if the replacement card type is not identical to the original card.
This issue is related to virtual interface bundling, and occurs only on interfaces that
are members of a cable bundle.
Workaround: Reboot the router.
CSCsd31496
A Cisco uBR7246 router experiences unexpected bus reloads at payload header
suppression (PHS) function as a result of accessing freed memory.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
258
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Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(17a)BC
Table 69 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(17a)BC
release.
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC
DDTS ID Number
Description
CSCef60396
When a file is copied via the Trivial File Transfer Protocol (TFTP) on a secondary
Route Processor (RP) while a switchover occurs that causes the secondary RP to
become the primary RP, the new primary RP (that is, the RP that was the secondary
RP before the switchover) unexpectedly reloads when it resumes copying the file.
This issue occurs on a Cisco 7304 router that has two RPs that function in a
redundant configuration.
Workaround: Do not perform any TFTP copies from the console of the secondary
RP.
CSCef60659
A document that describes how the Internet Control Message Protocol (ICMP)
could be used to perform a number of Denial of Service (DoS) attacks against the
Transmission Control Protocol (TCP) has been made publicly available. This
document has been published through the Internet Engineering Task Force (IETF)
Internet Draft process, and is entitled “ICMP Attacks Against TCP”
(draft-gont-tcpm-icmp-attacks-03.txt).
These attacks, which only affect sessions terminating or originating on a device
itself, can be of three types:
1.
Attacks that use ICMP “hard” error messages
2.
Attacks that use ICMP “fragmentation needed and Don't Fragment (DF)
bit set” messages, also known as Path Maximum Transmission Unit
Discovery (PMTUD) attacks
3.
Attacks that use ICMP “source quench” messages
Successful attacks may cause connection resets or reduction of throughput in
existing connections, depending on the attack type.
Multiple Cisco products are affected by the attacks described in this Internet draft.
Cisco has made free software available to address these vulnerabilities. In some
cases there are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
050412-icmp
The disclosure of these vulnerabilities is being coordinated by the National
Infrastructure Security Coordination Centre (NISCC), based in the United
Kingdom. NISCC is working with multiple vendors whose products are potentially
affected. Its posting can be found at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
050412-icmp
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCef90168
When using Transparent LAN Service (TLS) in a non-Baseline Privacy Interface
(BPI) environment, traffic flows between different VPNs.
Workaround One: Use the feature on BPI-enabled modems only.
Workaround Two: Isolate the remote networks with a gateway/firewall router.
CSCef96146
Frequent log messages, reporting a problem with one of the fans, are generated:
%ENVM-3-BLOWER: Fan 1 may have failed
The fan appears to be working correctly with no cooling problem.
So far this issue has been reported only on Cisco uBR7200 routers running
Cisco IOS Release 12.2(15)BC2, such as 2a or 2b.
There are no known workarounds.
CSCeg74394
The primary and backup Fast Ethernet (FE) or Gigabit Ethernet (GE) interfaces go
into admin shutdown after a reload.
While the router is coming backup after a reload, the console displays Ethernets
coming up and then going down, followed by a “shutdown” notice under the
configuration for both interfaces. In addition, one of the Ethernet interfaces loses
its configured IP address and “no ip address” appears in the interface configuration.
This issue occurs only if a higher number FE or GE interface, such as FE0/3 or
GE0/3, is configured as primary while a lower number interface, such as FE 0/2 or
GE0/2, is configured as backup.
This issue does not occur when the situation is reversed: when a lower number
Ethernet interface is configured as primary, and a higher number Ethernet interface
is configured as backup.
There are no known workarounds.
CSCeh03165
A Cisco uBR router experiences an unexpected reload when the cable arp debug
command, followed by a clear arp command, is executed, or when only the clear
arp command is executed.
There are no known workarounds.
CSCeh04755
When you enter the reload command for a router, the router unexpectedly enters
ROMmon mode and generates the following error message:
%SYS-5-RELOAD: Reload requested by console.
Reload Reason: Reload command.
monitor: command “boot” aborted due to user interrupt
rommon 1 >
This issue occurs only on Cisco uBR7200 routers with the NPE-G1, and on
Cisco uBR7246VXR routers with the Cisco uBR-NPE-G1.
Workaround: Enter the confreg 0x2002 command.
CSCeh13489
A router resets its Border Gateway Protocol (BGP) session.
This issue occurs when a Cisco router that peers with other routers receives an
Autonomous System (AS) path with a length that is equal to or greater than 255.
Workaround: Configure the bgp maxas limit command so that the maximum
length of the AS path is a value below 255. When the router receives an update with
an excessive AS path value, the prefix is rejected and an event is recorded in the log.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
260
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Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCeh89244
The cable modem termination system (CMTS) does not remove the quality of
service (QoS) profiles created by cable modems (CMs), even if they are not used by
any CM on the system.
There are no known workarounds.
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using the cable monitor on the
MC16C card.
There are no known workarounds.
CSCei25374
Cable modems being load balanced between cable line cards take a long time to
come online. Modems are stuck in the “pending” state. This state appears in the
output of the show cable load-balance pending command.
Affected modems have duplicate entries in the pending table and are being moved
back and forth between different line cards.
This issue occurs when load balancing is configured between Cisco uBR-MC28U
line cards and a cable modem is directed by a line card to move to a second line
card. However, by the time the modem is moved to the second line card, the second
line card has enough modems online and directs the modem to move back, or to yet
another line card.
Workaround: Configure a large minimum-threshold for load balancing with the
cable load-balance group group-number threshold load minimum
minimum-threshold command.
To make the cable modems stuck in the pending state come online, execute the
clear cable load-balance state command.
CSCei25867
If a cable monitor command is configured on a legacy cable line card in a
Cisco uBR7200 chassis and the command involves ACL, the command disappears
after a cable modem termination system (CMTS) reload.
This issue does not occur with an MC28U or MC16U card in the same CMTS
chassis.
There are no known workarounds.
CSCei29698
Modems mapped to a dot1q Transparent LAN Service (TLS) tunnel do not come
online after a reset
This issue occurs if the cable modem (CM) is mapped to a dot1q TLS tunnel and is
then reset.
Workaround: Enter the clear cable modem mac d command from the cable modem
termination system (CMTS).
CSCei30261
The cable modem termination system (CMTS) wrongly sends the payload header
suppression (PHS) error set in its response when there are no PHS rule errors.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCei32125
The cable monitor command is not configured on the MC28U CLC.
This issue occurs when a cable monitor command that contains no space between
the output interface name and the slot/sublsot is sent from the NPE to the MC28U;
the MC28U CLC rejects the command. If there is space between the interface name
and its slot/subslot, the command is accepted by the CLC.
For example:
“cable monitor interface gi0/2 ...” fails, and “cable monitor interface gi 0/2 ...”
passes.
Workaround: When entering a cable monitor command, enter a space between the
output interface name and the slot/subslot of the command.
CSCei32146
The cable clock card does not show up in entityMIB.
There are no known workarounds.
CSCei36689
The boot images for the Cisco uBR7200 routers do not build for pre-CCO of
Cisco IOS Release 12.3(13)BC after the commit of CSCei25867 to the branch.
There are no known workarounds.
CSCei37717
The service class index 255 cannot be used with the cable match command; other
indices do work.
There are no known workarounds.
CSCei45607
The service-policy command is configurable on cable interfaces, which suggests
to customers that Modular QoS (MQC) is supported, but MQC is currently not
supported on Cable interfaces
There are no known workarounds.
CSCei49132
Traceback occurs on the NPE in a Cisco VXR router when the cable modem
termination system (CMTS) reloads, and the MC28U card is up and running.
This issue occurs when the CMON:ACL is configured on the CMTS.
There are no known workarounds.
CSCei51209
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when unconfiguring Transparent LAN Service (TLS) after an
online insertion and removal (OIR) of the WAN interface.
Workaround: Ensure that the WAN interface comes up after OIR, then remove the
TLS configuration.
CSCei51407
Multicast traffic fails to flow from the aggregator router to the cable modem
termination system (CMTS) through the Transparent LAN Service (TLS) tunnel.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
262
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCei51424
While polling certain objects in the docsIfMIB, IOS locks out interrupts for an
unusually long period of time.
This issue occurs because of the polled reading of the device across a slow data bus.
Workaround: Configure the cable modem termination system (CMTS) to prohibit
Simple Network Management Protocol (SNMP) reads of this particular object.
Example:
snmp-server view noarp 1.3.6.1.2.1.10.127.1.1.1.1 excluded
snmp-server view noarp iso include
snmp-server community “public” view noarp ro
CSCei61732
Cisco IOS may permit arbitrary code execution after exploitation of a heap-based
buffer overflow vulnerability. Cisco has included additional integrity checks in its
software, as further described below, that are intended to reduce the likelihood of
arbitrary code execution.
Cisco has made free software available that includes the additional integrity checks
for affected customers.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20051102-timers.shtml.
CSCei68746
Motorola cable modems (CMs) have two Organizational Unique Identifiers (OUIs).
One OUI is properly mapped to the vendor “Motorola” in the show cable modem
vendor display. For the other OUI, the “vendor” field shows the OUI, which means
the software does not know the identity of the vendor.
This issue occurs on newer Motorola CMs, which have the new OUI in use.
Workaround: Use the cable modem vendor oui vendor configuration command.
For example:
Router# show run |
cable modem vendor
cable modem vendor
cable modem vendor
CSCei69932
inc vendor
00.08.0E SB4220
00.06.28 CVA122
00.30.10 uBR900
PS does not get a gate-delete-ack from the cable modem termination system
(CMTS) for a PacketCable Multimedia (PCMM) call.
This issue occurs when a different PS, other than the one used at gate creation, is
used. CMTS sends out gate-delete-ack message to the original PS.
Workaround: Use the same PS.
CSCei72695
When the cable modem termination system (CMTS) is configured in mixed mode
using QAM16, and upstream is heavily utilized, a 0.5% pkt loss occurs on a
BCM3137 Physical Interface Chip (PHY) based line card.
Workaround: Increase the ranging-burst preamble power, which results in a
side-effect of low-signal-to-noise ratio (SNR), at around 17 dB, at the CMTS.
Alternative workaround: Do not use the QAM-16 rate on the CMTS.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
263
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCei85762
The cable modem termination system (CMTS) reports the following error when the
cable downstream subs-traffic-mgmt command is entered:
%IP PIM must be enabled on virtual interface Bundle1 for tunnel traffic
to get forwarded
%Error: DSG client list 0 is not defined yet.
There are no known workarounds.
CSCei85808
When the show cable subscriber-usage command is entered, the system does not
pause between screens with the “--More--” prompt.
There are no known workarounds.
CSCei86312
The cable modem termination system (CMTS) fails to send the classifier
information for the upstream to the termination side of the SMDS Interface
Protocol (SIP) Video phone call.
There are no known workarounds.
CSCei88999
If a Policy Server sends the cable modem termination system (CMTS) a gate-set
that results in the gate being in the ACTIVE state, and billing information is added
to the gate-set, the CMTS unexpectedly reloads when the cable modem (CM) sends
an -rsp to the Dynamic Service Addition (DSA) request sent by the CMTS.
In normal instances, the CM should not send an -rsp to the DSA request. Several
checks have been put in place to verify the parameters and ensure that the number
of service flows has not been exceeded. However, some CMs may still send an -rsp
to a DSA. If an -rsp is sent, the event management code generates an event message
after the gate has been deleted.
Workaround: Because it cannot be determined when the CM will send an -rsp, the
best workaround is to not use EM at this time.
CSCej61240
The following “% Ambiguous command:” messages occur when IP-related
commands are input:
%
%
%
%
%
%
%
Ambiguous
Ambiguous
Ambiguous
Ambiguous
Ambiguous
Ambiguous
Ambiguous
command:
command:
command:
command:
command:
command:
command:
“ip
“ip
“ip
“ip
“ip
“ip
“ip
dhcp pool “
dhcp binding “
dhcp smart-relay “
domain “
domain-lookup “
address-pool “
telnet comport “
This issue occurs in the Cisco IOS Release 12.3BC train.
There are no known workarounds.
CSCei90582
A service policy cannot be configured on a virtual bundle interface. An error
message is returned when the command is entered.
This issue occurs when configuring a virtual bundle interface using the Cisco IOS
Release 12.3(13a)BC or later.
There are no known workarounds.
CSCej23936
Tracebacks occur when executing an OSS-03 snmpv3 test.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
264
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCej34349
PacketCable Multimedia (PCMM) gates are left without the timer running and can
use up gate resources when used with a legacy card.
Workaround: Enter the clear packet gate all command. However, be aware that
this command clears all gates and can impact service.
CSCek07537
The cable modem termination system (CMTS) does not allow the UCC-RSP MAC
message to be transmitted over a secondary service identifier (SID). This behavior
is not DOCSIS2.0 compliant.
There are no known workarounds.
CSCek23937
The uptime-field in a SAMIS exported records goes negative after 248 days:
(CMTSsysUpTime)-2147425017/(CMTSsysUpTime)
CMTSsysUpTime is an official DOCSIS / SAMIS MIB variable name.
This condition causes the billing application to drop records because of invalid
values. Thus, an unpatched billing application cannot charge some customers for
used traffic.
This issue occurs on all cable modem termination systems (CMTSs) that are not
rebooted after more than 2147483647/100 seconds or 248 days.
Workaround: Prior to 248 days of uptime, schedule a CMTS reload during a
maintenance window.
CSCsa54516
Baseline Privacy Interface (BPI)-enabled modems shift from online(pt) to
online(pk), and traffic is not encrypted.
During this state, the traffic encryption key (TEK) request message is blocked and
is not received by the cable modem termination system (CMTS).
Workaround: Reboot the CMTS.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
265
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsa59600h
A document that describes how the Internet Control Message Protocol (ICMP)
could be used to perform a number of Denial of Service (DoS) attacks against the
Transmission Control Protocol (TCP) has been made publicly available. This
document has been published through the Internet Engineering Task Force (IETF)
Internet Draft process, and is entitled “ICMP Attacks Against TCP”
(draft-gont-tcpm-icmp-attacks-03.txt).
These attacks, which only affect sessions terminating or originating on a device
itself, can be of three types:
1.
Attacks that use ICMP “hard” error messages
2.
Attacks that use ICMP “fragmentation needed and Don't Fragment (DF)
bit set” messages, also known as Path Maximum Transmission Unit
Discovery (PMTUD) attacks
3.
Attacks that use ICMP “source quench” messages
Successful attacks may cause connection resets or reduction of throughput in
existing connections, depending on the attack type.
Multiple Cisco products are affected by the attacks described in this Internet draft.
Cisco has made free software available to address these vulnerabilities. In some
cases there are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
050412-icmp
The disclosure of these vulnerabilities is being coordinated by the National
Infrastructure Security Coordination Centre (NISCC), based in the United
Kingdom. NISCC is working with multiple vendors whose products are potentially
affected. Its posting can be found at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20
050412-icmp
CSCsa93574
On a Cisco uBR7246 router, the following message appears while running
ubr7200-ik8s-mz.122-15.BC2f:
%SYS-3-INVMEMINT: Invalid memory action (free) at interrupt level
-Traceback= 60886E40 60581654 605816C0 6058277C 604FE8B0 604BC46C
6058EE1C 6058F360 605972E0 6059AE38 60590870 605A0468
There are no known workarounds.
CSCsb02366
The quality of service (QoS) Prov for DOCSIS 2.0 cable modems correctly shows
DOCSIS 1.0 or DOCSIS 1.1 because the major difference between a modem
running in DOCSIS 2.0 mode as opposed to DOCSIS 1.0/1.1 mode is the physical
layer and not the QoS provisioning.
However, to be consistent, the “DOC2.0” column under “QoS Provision” should be
removed from the show cable modem mac summary command display.
In addition, a show cable modem phy summary command should be added to
provide a quick summary of the cable modems in each phy mode on each interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
266
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsb03623
The snmpwalk of cdxIfCmtsServiceOutOctets counter reports a value of 0 for
interfaces connected to cable modems, even though there is traffic on the interface.
There are no known workarounds.
CSCsb10448
When dynamic upstream load-balancing is configured in a Multiprotocol Label
Switching (MPLS)/Virtual Private Network (VPN) environment, any cable
modems with secondary upstream service-flows associated with the management
VPN that are moved by the load-balancing process have no IP connectivity.
The show cable modem h.h.h qos command followed by the show interface cable
x/y/z sid cm primary sid association command shows the cable modem (CM)
primary service identifier (SID) associated with the management VPN.
The show interface cable x/y/z sid cm secondary sid association command shows
the secondary SID is “Not in use”.
This issue occurs when the cable modem termination system (CMTS) is configured
for MPLS/VPN, and a CM that is associated with a VPN is being moved to a new
upstream using dynamic load-balancing, and has more than 1 upstream service
flow (DOCSIS 1.1 or PacketCable). Static load-balancing does not induce this
problem. (For example, under the above conditions, a load-balancing configuration
such as cable load-balance group 1 threshold load 5 enforce can induce this
issue.)
Workaround: As a temporary workaround, reset any modems in this state using the
clear cable modem h.h.h reset command:
No permanent workaround exists. In this environment, dynamic load-balancing
should be disabled.
CSCsb24464
When the show interfaces x/y command is issued on the Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor the output values at the bundle interface.
CSCsb27921
The QoS parameter in the event message is set to 00 00 00 00 when the QoS bit
mask is set to 0.
The above behavior is a constant; no special condition is required.
There are no known workarounds.
CSCsb33711
A Cisco uBR7200 router with an SRP interface unexpectedly reloads upon online
insertion and removal (OIR) of the SRP interface.
This issue occurs with Cisco IOS Release 12.3(09a)BC.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
267
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsb40202
The current implementation of cable filter groups allows a cable modem (CM) or
customer premises equipment (CPE) device to bypass filters.
There are two situations that can trigger this issue:
1.
The multiple service operator (MSO) configures the cable modem termination
system (CMTS) with default cable filter groups using the cable submgmt
default filter-group command and points them to a group ID that does not
exist. IOS will not give a warning, and the device is completely open.
2.
DOCSIS1.1 provisioned CMs have TLV 37 configured, but point to a group ID
that does not exist. IOS gives no warning, and the device is completely open.
In situations where a group ID does not exist, the default behavior of IOS should
probably be deny all (the behavior of traditional ACLs) instead of the current
permit all.
There are no known workarounds.
CSCsb42361
A Cisco uBR7200 series cable modem termination system (CMTS) reports high
CPU usage in the IP Background process after adding a secondary IP address to a
cable or bundle interface.
The issue occurs when the number of Address Resolution Protocol (ARP) entries
on the interface being configured is in the tens of thousands.
The number of ARP entries on each interface can be approximately gauged with
the show adjacency summary command.
Workaround: Ensure that secondary IP addresses are added during a maintenance
window.
Alternative workaround: Segment the CMTS into small cable interface bundle
groups, or use separate subinterfaces so that a lower number of modems and
customer premises equipment ARP entries are linked to each subinterface.
CSCsb43435
The micro reflections column in the show cable modem remote-query command
is not accurate.
There are no known workarounds.
CSCsb44190
When the server does not reply properly, CMTS METERING collection Process
messages and traceback occur, but no unexpected reloads.
This issue occurs under the following conditions:
•
SAMIS configuration on the Cisco uBR7200 router
•
Server does not reply properly
Workaround: Restart the server for proper reply.
CSCsb52780
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when the WAN interface is not present because of an online
insertion and removal (OIR), and the cable modems (CMs) participating in L2VPN
(that are mapped to this WAN interface) are being initialized.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
268
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsb86672
Cable modems are online, but the Media Terminal Adapter (MTA) is not getting
IPs.
Workaround: Microcode reload pxf.
CSCsc01111
Certain bytes, when printed out as a string, cause problems with terminal sessions.
When using debugging on the cable modem termination system (CMTS), the
CMTS should print the Opaque data object as hex, and not as a string.
There are no known workarounds.
CSCsc07632
Modifying a downstream Gate with classifier information always fails, returning a
Gate-Set-Error.
This issue occurs when the downstream Gate already exists on the system and is
being modified.
Workaround: Remove the downstream Gate and make a new one rather than
modifying the original one.
CSCsc11996
A problem in the cable modem termination system (CMTS) codebase causes
Cisco uBR7200 routers to unexpectedly reload due to memory corruption.
This unexpected reload occurs in configurations using both Internet Group
Management Protocol (IGMP) and Baseline Privacy Interface Plus (BPI+) when
the number of multicast addresses assigned to a single multicast service identifier
(SID) exceeds 119. The code supports a maximum of 8 multicast addresses per
multicast SID per modem.
Workaround: Use IP access lists to organize the multicast addresses into groups of
eight. Then, use the cable match address interface configuration command to
create a multicast Security Association Identifier (SAID) for each group of
addresses.
CSCsc14890
A feature request has been made to enable a CLI command to define a period of
time for the cable modem termination system (CMTS) to tear down dynamic
service flows that have not been torn down. This request is for a non-PacketCable
environment when the cable modem (CM) sends a DSD-REQ to tear down service
flows that are no longer in use.
This issue occurs in a non-PacketCable environment when the CMs control
dynamic service setup and tear down.
There are no known workarounds.
CSCsc16554
Internet Group Management Protocol (IGMP) state limit counters increase (upon
join) but do not decrease (upon leave), resulting in denial.
This issue occurs only when Source Specific Multicast (SSM) is combined with the
IGMP state limit (which then requires source mapping).
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
269
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsc20334
A disabled DOCSIS Set-Top Gateway (DSG) tunnel becomes enabled when the
tunnel’s MAC address is updated or the same MAC address is specified in the
tunnel command.
This issue occurs when updating the DSG tunnel configuration.
Workaround: If the target state of the DSG tunnel is disabled, always specify
“disable” the option when updating the DSG tunnel configuration.
CSCsc20755
PacketCable CALEA calls are not replicating downstream packets.
This issue occurs on a cable modem termination system (CMTS) on a
Cisco uBR7246VXR router running Cisco IOS Release 12.3(9a)BC3 with an
MC16C or MC16S cable line card, and is caused by the payload header suppression
(PHS) feature.
Workaround: Use a newer cable line card, such as the MC28U.
CSCsc26813
The multiple service operator (MSO) is sharing the hybrid fiber coaxial (HFC)
network, and the band assignment of frequency is strict. There is no extra frequency
to assign a few kHz.
Most cable operators assign two adjacent band frequencies, and these frequencies
are considered a frequency band. The coalescing adjacent bands code should be
removed.
There are no known workarounds.
CSCsc38561
When a Cisco uBR series cable modem termination system (CMTS) is configured
with the global configuration cable primary-sflow-qos11 keep [all | snmp]
command, the primary service identifier (SID) activity timer for cable modems
operating in DOCSIS 1.1 mode is reset when the modem goes offline and comes
back online.
The expected behavior is that this timer is not reset when this command is
configured.
The issue applies to cable modems operating in DOCSIS 1.1 mode when the cable
primary-sflow-qos11 keep [all | snmp] command is configured.
Workaround: Use the service-flow activity timers in the show interface cable x/y
service-flow-number command, which are not reset incorrectly.
CSCsc39576
A Cisco uBR7200VXR router configured with a bundle interface and cable source,
verify dhcp forwards traffic without a verification.
An Address Resolution Protocol (ARP) entry is created for the offending host, but
the host does not appear in the cable modem (CM) database.
There are no known workarounds.
CSCsc46991
Users cannot change the service policy.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
270
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsc47795
A Cisco uBR series cable modem termination system (CMTS) does not allow a user
to configure a downstream cable service class with a max-burst field.
The issue occurs when a cable service class has been defined as a downstream
service class per the global configuration cable service class service-class-number
downstream command.
Workaround: As a temporary workaround, include a max-burst value within a
downstream cable service class by defining it as an upstream service class,
specifying the max-burst, and then, reverting the service class to a downstream
service class as shown in the following example:
Router(config)#
Router(config)#
Router(config)#
Router(config)#
Note
CSCsc51353
cable
cable
cable
cable
service
service
service
service
class
class
class
class
9
9
9
9
name test
upstream
max-burst 9999
downstream
This workaround does not survive a CMTS reload.
On a Cisco uBR7200 series cable modem termination system (CMTS) with an
MC28U style line card, the following error message appears in the unit logs at the
CMTS bootup:
SLOT 3/0: %PARSER-4-BADRANGE: Bad range <1-0> for command 'cable filter
group 10 index 128 src-ip 0.0.0.0'
As a result of this issue, the filter group does not work as expected.
The issue occurs for all global configuration cable filter group group-number
index index-number commands.
There are no known workarounds.
CSCsc57494
Certain models of subscriber equipment fail to establish PPP over Ethernet
(PPPoE) sessions because the cable modem termination system (CMTS) proceeds
to Point-to-Point Protocol (PPP) Link Control Protocol (LCP) negotiation without
sending PPPoE Active Discovery Session-confirmation (PADS) first. A detailed
debugging suggests that the CMTS attempts to send the PADS to a wrong
(nonexistent) service identifier (SID), instead of the correct one:
Nov 16 11:02:32.890: No sid instance for SID # with MAC ####.####.####
on Cable#/#
This issue occurs on post Cisco IOS Release 12.2(11)BC3c releases on a
Cisco uBR7200 CMTS configured to terminate PPPoE.
Workaround: Revert to Cisco IOS Release 12.2(11)BC3c or earlier releases. Also,
after the CMTS selects the SID value at random, the subscriber has a chance to
establish PPPoE session(s) if they keep trying long enough.
CSCsc58373
The cable modem termination system (CMTS) should send random MPEG NULL
frames or certain chipset cable modems might not get a lock at the DS 256QAM
signal.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
271
Caveats for Cisco IOS Release 12.3 BC
Table 69
Resolved Caveats for Cisco IOS Release 12.3(17a)BC (continued)
DDTS ID Number
Description
CSCsc59302
A Cisco uBR7246 router, configured for spectrum management, experiences a
software-forced reload breakpoint exception with CPU signal 23 due to a block
overrun condition.
This issue occurs when an upstream frequency hop is initiated by spectrum
management concurrently with an mslot counter wrap.
There are no known workarounds.
CSCsc68462
When payload header suppression (PHS) is used with PacketCable telephony, the
downstream PHS index is set incorrectly, resulting in no downstream voice.
There are no known workarounds.
CSCsc75949
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when an access list in a cable match statement is modified, and
then the interface is shut.
There are no known workarounds.
Open Caveats for Release 12.3(13a)BC6
Table 70 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC6
release.
Table 70
Open Caveats for Cisco IOS Release 12.3(13a)BC6
DDTS ID Number
Description
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using the cable monitor on the MC16C
card.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC-address-based cable monitor does
not show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb24464
When the show interfaces x/y command is issued on a Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor the output values at the bundle interface.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
272
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 70
Open Caveats for Cisco IOS Release 12.3(13a)BC6 (continued)
DDTS ID Number
Description
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsb40202
The current implementation of cable filter groups allows a cable modem or
customer premises equipment (CPE) device to bypass filters.
There are two situations when this issue can be triggered:
1.
The multiple system operator (MSO) configures the cable modem termination
system (CMTS) with default cable filter groups using the cable submgmt
default filter-group command and points them to a group ID that does not
exist. IOS will not give a warning, and the device is completely open.
2.
Data-over-Cable Service Interface Specification (DOCSIS)1.1 provisioned
cable modems have TLV 37 configured, but point to a group ID that does not
exist. IOS gives no warning, and the device is completely open.
In situations when a group ID does not exist, the default behavior of IOS should
probably be deny all (the traditional behavior of access control lists (ACLs)),
instead of the current permit all.
There are no known workarounds.
Resolved Caveats for Release 12.3(13a)BC6
Table 71 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC6
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
273
Caveats for Cisco IOS Release 12.3 BC
Table 71
Resolved Caveats for Cisco IOS Release 12.3(13a)BC6
DDTS ID Number
Description
CSCek07537
The cable modem termination system (CMTS) does not allow the UCC-RSP MAC
message to be transmitted over a secondary service identifier (SID). This behavior
is not Data-over-Cable Service Interface Specification (DOCSIS) 2.0 compliant.
There are no known workarounds.
CSCek37177
The Cisco IOS Transmission Control Protocol (TCP) listener in certain versions of
Cisco IOS software is vulnerable to a remotely-exploitable memory leak that may
lead to a denial of service condition.
This vulnerability only applies to traffic destined to the Cisco IOS device. Traffic
transiting the Cisco IOS device will not trigger this vulnerability.
Cisco has made free software available to address this vulnerability for affected
customers.
This issue is documented as Cisco bug ID CSCek37177.
There are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
CSCsa69446
Authentication, Authorization, and Accounting (AAA) authorization does not work
when login authentication is configured for the line, nor when the if- authenticated
keyword is specified.
Workaround: Use either enable or local as the fallback authentication method.
CSCsc27292
Integrated customer premises equipment (CPE) inside of certain brands of cable
modems and set-top box units are unable to acquire an IP address using the
Cisco uBR cable modem termination system (CMTS).
The issue occurs when cable interface bundling is configured on Cisco IOS
Release 12.3(13a)BC, but not in earlier Cisco IOS releases.
Workaround: Revert to an earlier release of Cisco IOS for the Cisco uBR CMTS,
or unconfigure cable interface bundling.
CSCsd30319
Modems get stuck in the init(o) state following an online insertion and removal
(OIR) operation if the replacement card type is not identical to the original card.
This issue is related to virtual interface bundling, and only occurs on interfaces that
are members of a cable bundle.
Workaround: Reboot the router.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
274
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 71
Resolved Caveats for Cisco IOS Release 12.3(13a)BC6 (continued)
DDTS ID Number
Description
CSCsd92344
A Cisco uBR series cable modem termination system (CMTS) returns an error
message similar to the following:
%SYS-3-CPUHOG: Task is running for (2008)msecs, more than (2000)msecs
(699/198),process = DHCPD Receive.
This message is followed by another error message similar to the following, and a
software-forced reload:
%UBR7200-4-FAILED_DS_SID_LOOKUP: Failed to find host in DS on int
SID # 4271, IP = 10.99.82.19, MAC = 0004.1af1.c34a
with
This issue occurs when the cable or virtual bundle interface configuration cable
source-verify dhcp command is configured, and is triggered by end hosts that have
duplicate or spoofed Ethernet MAC addresses.
Workaround: Remove the dhcp portion of the cable source-verify dhcp command,
and use the cable source-verify command only.
CSCsb19763
CF flash cannot be read between redundant eRSC cards.
This condition occurs when a CF flash card is formatted in one eRSC slot and the
IOS and firmware are transferred to the CF flash card using the Trivial File Transfer
Protocol (TFTP). If the formatted flash card is removed and inserted into a different
eRSC slot, the new eRSC slot cannot read the CF.
Workaround: Associate a CF flash card to a particular eRSC and keep it with that
card. TFTP all needed files to the CF either using the LAN or local TFTP laptop.
Open Caveats for Release 12.3(13a)BC5
Table 72 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC5
release.
Table 72
Open Caveats for Cisco IOS Release 12.3(13a)BC5
DDTS ID Number
Description
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using the cable monitor on the
MC16C card.
There are no known workarounds.
CSCei25309
The cable monitor and MC16C card do not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
service identifier (SID) option and map-grant.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC-address-based cable monitor does
not show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
275
Caveats for Cisco IOS Release 12.3 BC
Table 72
Open Caveats for Cisco IOS Release 12.3(13a)BC5 (continued)
DDTS ID Number
Description
CSCsb24464
When the show interfaces x/y command is issued on a Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor these values at the bundle interface.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsb30270
The Cisco uBR7200VXR router with MC28U style line cards has an internal
127.x.x.x network that is used for inter line card communication.
This network is errantly advertised by IP routing protocols when the redistribute
connected [subnets] command is specified under the routing protocol’s
configuration paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands will achieve this goal for an Open Shortest Path First
(OSPF) process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
CSCsb40202
The current implementation of cable filter groups allows a cable modem (CM) or
customer premises equipment (CPE) device to bypass filters.
There are two situations when this issue can be triggered:
1.
The multiple service operator (MSO) configures the cable modem termination
system (CMTS) with default cable filter groups using the cable submgmt
default filter-group command and points them to a group ID that does not
exist. IOS will not give a warning, and the device is completely open.
2.
DOCSIS1.1 provisioned CMs have TLV 37 configured, but point to a group ID
that does not exist. IOS gives no warning, and the device is completely open.
In situations when a group ID does not exist, the default behavior of IOS should
probably be deny all (the behavior of traditional ACLs) instead of the current
permit all.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
276
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(13a)BC5
There are no known resolved caveats for the Cisco IOS 12.3(13a)BC5 release.
Open Caveats for Release 12.3(13a)BC4
Table 73 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC4
release.
Table 73
Open Caveats for Cisco IOS Release 12.3(13a)BC4
DDTS ID Number
Description
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using cable monitor on the MC16C
card.
There are no known workarounds.
CSCei25309
The cable monitor and MC16C card do not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
ID option and map-grant.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC-address-based cable monitor does
not show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb24464
When the show interfaces x/y command is issued on the Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor the output values at the bundle interface.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
277
Caveats for Cisco IOS Release 12.3 BC
Table 73
Open Caveats for Cisco IOS Release 12.3(13a)BC4 (continued)
DDTS ID Number
Description
CSCsb30270
The Cisco uBR7200VXR router with MC28U style line cards has an internal
127.x.x.x network that is used for inter line card communication.
This network is errantly advertised by IP routing protocols when the redistribute
connected [subnets] command is specified under the routing protocol’s
configuration paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands achieve this goal for an Open Shortest Path First (OSPF)
process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
CSCsb40202
The current implementation of cable filter groups allows a cable modem (CM) or
customer premises equipment (CPE) device to bypass filters.
There are two situations where this issue is triggered:
1.
The multiple service operator (MSO) configures the cable modem termination
system (CMTS) with default cable filter groups using the cable submgmt
default filter-group command and points them to a group ID that does not
exist. IOS will not give a warning, and the device is completely open.
2.
DOCSIS1.1 provisioned CMs have TLV 37 configured, but point to a group ID
that does not exist. IOS gives no warning, and the device is completely open.
In situations when a group ID does not exist, the default behavior of IOS should
probably be deny all (the behavior of traditional ACLs), instead of the current
permit all.
There are no known workarounds.
Resolved Caveats for Release 12.3(13a)BC4
Table 74 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC4
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
278
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 74
Resolved Caveats for Cisco IOS Release 12.3(13a)BC4
DDTS ID Number
Description
CSCsd16035
Configured traps for cable and docsis-cmts become disabled as soon as another trap
is configured.
This issue occurs on Cisco IOS Release 12.3(9a)BC6.
Workaround: Configure cable and docsis-cmts traps last.
CSCek26121
The sysUptime SNMP OID counter is reset after a Performance Routing Engine
(PRE) switchover occurs.
There are no known workarounds.
CSCsa92748
A Network Processing Engine G1 (NPE-G1) restarts unexpectedly and reports the
following message:
Last reset from watchdog reset
This issue occurs only on Cisco 7200 and Cisco 7301 series routers that are
configured with an NPE-G1 Network Processing Engine.
There are no known workarounds.
CSCsd15546
A Cisco router configured as a Dynamic Host Configuration Protocol (DHCP)
relay does not append Option 82 (Relay Agent Option), even when configured to
do so:
ip dhcp relay information option
no ip dhcp relay information check
ip dhcp relay information trust-all
This issue occurs when the DHCP message contains an invalid option (such as,.
option 12 with length 0).
Workaround: Ensure that the DHCP messages that are sent to the Cisco router that
is acting as a DHCP relay contain valid options.
CSCsd20814
MC28Us add additional leading byte(s) to the data payload portion of a cable
intercept packet, when the source MAC address of the original packet is expected.
Most recreated attempts only show a single extra byte. However, there have been
instances where more than one extra byte was added.
There are no known workarounds.
CSCsb84207
Clone cable modems take legitimate modems offline.
There are no known workarounds.
CSCsd22348
A Cisco uBR7246VXR router unexpectedly reloads at cmts_rx_pdu_common.
There are no known workarounds.
CSCsc86473
High forward error correction (FEC) counts occur on a Cisco uBR7200 cable
modem termination system (CMTS) for attached cable modems. As a result, the
cable modems are unable to come online.
This issue occurs on a Cisco uBR7200 router running
ubr7200clc-lck8-mz-12.3(9a)BC3 software equipped with MC28U cards and
connected to a high number (2000 to 3000) of cable modems. The errors are related
to specific third party cable modems
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
279
Caveats for Cisco IOS Release 12.3 BC
Table 74
Resolved Caveats for Cisco IOS Release 12.3(13a)BC4 (continued)
DDTS ID Number
Description
CSCsb25448
A Cisco uBR7246VXR router unexpectedly reloads.
There are no known workarounds.
CSCsd84940
For Cisco IOS Releases 12.3(17a)BC, 12.3(13)BC1, 12.3(13)BC2, and
12.3(9a)BC8, a significant increase in the number of upstream forward error
correction (FEC) errors occurs when using MC16C or MC28C cards.
The exact degradation that occurs (if any) depends upon the plant conditions and
the cable modems (CMs) and Media Terminal Adapters (MTAs) being used.
There are no known workarounds.
Open Caveats for Release 12.3(13a)BC3
Table 75 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC3
release.
Table 75
Open Caveats for Cisco IOS Release 12.3(13a)BC3
DDTS ID Number
Description
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using the cable monitor on the
MC16C card.
There are no known workarounds.
CSCei25309
The cable monitor and MC16C card does not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
service identifier (SID) option and map-grant.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC-address-based cable monitor does
not show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb24464
When the show interfaces x/y command is issued on a Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor the output values at the bundle interface.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
280
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 75
Open Caveats for Cisco IOS Release 12.3(13a)BC3 (continued)
DDTS ID Number
Description
CSCsb30270
The Cisco uBR7200VXR router with MC28U style line cards has an internal
127.x.x.x network that is used for inter line card communication.
This network is errantly advertised by IP routing protocols when the redistribute
connected [subnets] command is specified under the routing protocol’s
configuration paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands achieve this goal for an Open Shortest Path First (OSPF)
process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
CSCsb40202
The current implementation of cable filter groups allows a cable modem (CM) or
customer premises equipment (CPE) device to bypass filters.
There are two situations when this issue is triggered:
1.
The multiple service operator (MSO) configures the cable modem termination
system (CMTS) with default cable filter groups using the cable submgmt
default filter-group command and points them to a group ID that does not
exist. IOS will not give a warning, and the device is completely open.
2.
DOCSIS1.1 provisioned cable modems have TLV 37 configured, but point to
a group ID that does not exist. IOS gives no warning, and the device is
completely open.
In situations when a group ID does not exist, the default behavior of IOS should
probably be deny all (the behavior of traditional ACLs) instead of the current
permit all.
There are no known workarounds.
Resolved Caveats for Release 12.3(13a)BC3
Table 76 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC3
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
281
Caveats for Cisco IOS Release 12.3 BC
Table 76
Resolved Caveats for Cisco IOS Release 12.3(13a)BC3
DDTS ID Number
Description
CSCek23937
The uptime-field in SAMIS exported records goes negative after 248 days:
(CMTSsysUpTime)-2147425017/(CMTSsysUpTime)
CMTSsysUpTime is an official DOCSIS/SAMIS MIB variable name.
This issue causes the billing application to drop records because of invalid values.
Thus, an unpatched billing application cannot charge some customers for used
traffic.
This issue occurs for all cable modem termination systems (CMTSs) that are not
rebooted after more than 2147483647/100 seconds or 248 days.
Workaround: Prior to 248 days of uptime, schedule a CMTS reload during a
maintenance window.
CSCek27197
With Dynamic Shared Secret (DMIC) enabled, modems get stuck in the init(io)
state and fail to register.
This issue occurs when Dynamic Shared Secret is enabled, and most, if not ALL,
of the following conditions are true:
•
Each modem gets its own config file (for example, when BACC is used for
provisioning)
•
The cable modem (CM) config files are large (greater than 1024 bytes in size)
•
A large number of modems are trying to connect to the cable modem
termination system (CMTS)
There are no known workarounds.
CSCsd15908
Some enhancements have been made to the DSX error handling code. The code, as
is, does not always react correctly to failed DSX exchanges, which can result in
classifiers that are not active, or are in the wrong state. One result of a complicated
set of DSX failures is an unexpected reload of the cable modem termination system
(CMTS).
There are no known workarounds.
CSCsd15919
Some enhancements have been made to the DSX error handling code. The code, as
is, does not always react correctly to failed DSX exchanges, which can result in
classifiers that are not active, or are in the wrong state. One result of a complicated
set of DSX failures is an unexpected reload of the cable modem termination system
(CMTS). This caveat requests additional error handling.
There are no known workarounds.
CSCsd15930
Some enhancements have been made to the DSX error handling code. The code, as
is, does not always react correctly to failed DSX exchanges, which can result in
classifiers that are not active, or are in the wrong state. One result of a complicated
set of DSX failures is an unexpected reload of the cable modem termination system
(CMTS). This caveat requests additional error handling.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
282
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 76
Resolved Caveats for Cisco IOS Release 12.3(13a)BC3 (continued)
DDTS ID Number
Description
CSCsd15937
On voice systems, the following occurs:
•
The clear cable modem mac delete command leads to a software-forced
reload.
•
Any cable modem (CM) going offline, for any reason, leads to a
software-forced reload.
•
Aborted DSX transactions lead to a software-forced reload.
•
A Dynamic Service Deletion (DSD) message leads to a software-forced reload.
This issue affects Cisco IOS Releases 12.2(15)BC2h, 12.3(13)BC1 and
12.3(13)BC2.
CM initiates overlapping Dynamic Service Change (DSC) transactions, drops DSC
ACKs, and does not hold down the state of previous transaction. Classifier state is
modified during several transactions which overlap DSX error handling, creating a
classifier with a state that does not match the list that it is on, or creating duplicate
classifier pointers on the same list. Subsequent state changes followed by DSC
delete, DSD, or CM offline cause a double free of the classifier pointer, resulting
in a software forced reload.
Workaround: A debug image is available, which avoids the software-forced reload
and provides additional debugging information.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
283
Caveats for Cisco IOS Release 12.3 BC
Table 76
Resolved Caveats for Cisco IOS Release 12.3(13a)BC3 (continued)
DDTS ID Number
Description
CSCsd17301
With Dynamic Shared Secret (DMIC) configured on the cable modem termination
system (CMTS), the CMTS enters a state where all subsequent cable modem (CM)
registration attempts fail and the CM ends up in the init(io) state. Cable modems
that are online continue to work, but any cable modems that are reset, either by
means of power-cycling or by the delete/reset command, fail.
This issue occurs if the multiple service operator (MSO) mistakenly provisions a
modem config file that does not exist on the Trivial File Transfer Protocol (TFTP)
server, and any modem tries to get online with the CMTS using such a non-existent
config file.
There are no known workarounds.
CSCsd20135
On voice systems, the following occurs:
•
The clear cable modem mac delete command leads to a software-forced
reload.
•
Any cable modem (CM) going offline, for any reason, leads to a
software-forced reload.
•
Aborted DSX transactions lead to a software-forced reload.
•
A Dynamic Service Deletion (DSD) message leads to a software-forced reload.
This issue affects Cisco IOS Releases 12.2(15)BC2h, 12.3(13)BC1 and
12.3(13)BC2.
CM initiates overlapping Dynamic Service Change (DSC) transactions, drops DSC
ACKs, and does not hold down the state of previous transaction. Classifier state is
modified during several transactions that overlap DSX error handling, possibly
creating duplicate classifier pointers on the same list. Subsequent state changes
followed by DSC delete, DSD, or CM offline cause a double free of the classifier
pointer, resulting in a software-forced reload.
Workaround: A debug image is available, which avoids the software-forced reload
and provides additional debugging information.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
284
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(13a)BC2
Table 77 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC2
release.
Table 77
Open Caveats for Cisco IOS Release 12.3(13a)BC2
DDTS ID Number
Description
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using the cable monitor on the
MC16C card.
There are no known workarounds.
CSCei25309
The cable monitor and MC16C card do not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
service identifier (SID) option and map-grant.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC-address-based cable monitor does
not show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb24464
When the show interfaces x/y command is issued on the Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor the output values at the bundle interface.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
285
Caveats for Cisco IOS Release 12.3 BC
Table 77
Open Caveats for Cisco IOS Release 12.3(13a)BC2 (continued)
DDTS ID Number
Description
CSCsb30270
The Cisco uBR7200VXR router with MC28U style line cards has an internal
127.x.x.x network that is used for inter line card communication.
This network is errantly advertised by IP routing protocols when the redistribute
connected [subnets] command is specified under the routing protocol’s
configuration paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands will this goal for an Open Shortest Path First (OSPF)
process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
CSCsb36687
Best effort traffic throughput is degraded when Unsolicited Grant Services with
Activity Detection (UGS-AD) service flows are provisioned and active on a
particular upstream. Best effort traffic seems to be not using bandwidth reserved
for UGS-AD, even though there is no traffic matching associated classifiers and the
service flows have switched to Real Time Polling (rtPS) mode.
This issue affects traffic on every upstream with active UGS-AD service flows.
There are no known workarounds.
CSCsb40202
The current implementation of cable filter groups allows a cable modem (CM) or
customer premises equipment (CPE) device to bypass filters.
There are two situations when this issue is triggered:
1.
The multiple service operator (MSO) configures the CMTS with default cable
filter groups using the cable submgmt default filter-group command and
points them to a group ID that does not exist. IOS will not give a warning, and
the device is completely open.
2.
DOCSIS1.1 provisioned CMs have TLV 37 configured, but point to a group ID
that does not exist. IOS gives no warning, and the device is completely open.
In situations where a group ID does not exist, default behavior of IOS should
probably be a deny all (the behavior of traditional ACLs) instead of the current
permit all.
There are no known workarounds.
Resolved Caveats for Release 12.3(13a)BC2
Table 78 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC2
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
286
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 78
Resolved Caveats for Cisco IOS Release 12.3(13a)BC2
DDTS ID Number
Description
CSCeh73049
A vulnerability exists within the Cisco IOS Authentication, Authorization, and
Accounting (AAA) command authorization feature, where command authorization
checks are not performed on commands executed from the Tool Command
Language (TCL) exec shell. This vulnerability allows authenticated users to bypass
command authorization checks in some configurations resulting in unauthorized
privilege escalation.
Devices that are not running AAA command authorization feature, or do not
support TCL functionality are not affected by this vulnerability.
This vulnerability is present in all versions of Cisco IOS that support the tclsh
command.
Workaround: This advisory with appropriate workarounds is posted at
http://www.cisco.com/warp/public/707/cisco-response-20060125-aaatcl.shtml
CSCeh89244
The cable modem termination system (CMTS) does not remove the quality of
service (QoS) profiles created by cable modems (CMs), even if they are not used by
any CM on the system.
There are no known workarounds.
CSCei72695
When configured in mixed mode using QAM16 and upstream is heavily utilized, a
0.5% pkt loss occurs on a BCM3137 Physical Interface Chip (PHY) based line
card.
Workaround: Increase the ranging-burst preamble power, which produces a
side-effect of low signal-to-noise ratio (SNR) of around 17 dB at the cable modem
termination system (CMTS).
Alternative workaround: Do not use QAM-16 rate on CMTS.
CSCsb86672
Cable modems are online, but the Media Terminal Adapter (MTA) is not getting
IPs.
Workaround: Microcode reload pxf.
CSCsc11996
A problem in the cable modem termination system (CMTS) codebase causes
Cisco uBR7200 routers to unexpectedly reload due to memory corruption.
This unexpected reload occurs in configurations using both Internet Group
Management Protocol (IGMP) and Baseline Privacy Interface Plus (BPI+) when
the number of multicast addresses assigned to a single multicast service identifier
(SID) exceeds 119. The code supports a maximum of 8 multicast addresses per
multicast SID per modem.
Workaround: Use IP access lists to organize the multicast addresses into groups of
eight. Then, use the cable match address interface configuration command to
create a multicast Security Association Identifier (SAID) for each group of
addresses.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 78
Resolved Caveats for Cisco IOS Release 12.3(13a)BC2 (continued)
DDTS ID Number
Description
CSCsc14890
A feature request has been made to enable a CLI command to define a period of
time for the cable modem termination system (CMTS) to tear down the dynamic
service flows that have not been torn down. This request is for a non-PacketCable
environment where the cable modem (CM) sends a DSD-REQ to tear down the
service flows that are no longer in use.
This issue occurs in a non-PacketCable environment where the CMs control
dynamic service setup and tear down.
There are no known workarounds.
CSCsc20755
PacketCable CALEA calls are not replicating downstream packets.
This issue occurs on a cable modem termination system (CMTS) on a
Cisco uBR7246VXR router running Cisco IOS Release 12.3(9a)BC3 with an
MC16C or MC16S cable line card, and is caused by the payload header suppression
(PHS) feature.
Workaround: Use a newer cable line card, such as the MC28U.
CSCsc26813
The multiple service operator (MSO) is sharing the hybrid fiber coaxial (HFC)
network, and the band assignment of frequency is strict. There is no extra frequency
to assign a few kHz.
Most cable operators assign two adjacent band frequencies, and these frequencies
are considered a frequency band. The coalescing adjacent bands code should be
removed.
There are no known workarounds.
CSCsc38561
When a Cisco uBR series cable modem termination system (CMTS) is configured
with the global configuration cable primary-sflow-qos11 keep [all | snmp]
command, the primary service identifier (SID) activity timer for cable modems
operating in DOCSIS 1.1 mode is reset when the modem goes offline and comes
back online.
The expected behavior is that this timer is not reset when this command is
configured.
The issue applies to cable modems operating in DOCSIS 1.1 mode when the cable
primary-sflow-qos11 keep [all | snmp] command is configured.
Workaround: Use the service-flow activity timers of the show interfaces cable x/y
service-flow-number command, which are not reset incorrectly.
CSCsc39576
A Cisco uBR7200VXR router configured with a bundle interface and cable source
verify dhcp forwards traffic without a verification.
An Address Resolution Protocol (ARP) entry is created for the offending host, but
it does not appear in the cable modem (CM) database.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
288
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Caveats for Cisco IOS Release 12.3 BC
Table 78
Resolved Caveats for Cisco IOS Release 12.3(13a)BC2 (continued)
DDTS ID Number
Description
CSCsc47795
A Cisco uBR series cable modem termination system (CMTS) does not allow a user
to configure a downstream cable service class with a max-burst field.
The issue occurs when a cable service class has been defined as a downstream
service class using the global configuration cable service class
service-class-number downstream command.
Workaround: As a temporary workaround, include a max-burst within a
downstream cable service class by defining it as an upstream service class,
specifying the max-burst, and then, reverting the service class to a downstream
service class as shown in the following example:
Router(config)#
Router(config)#
Router(config)#
Router(config)#
Note
CSCsc57494
cable
cable
cable
cable
service
service
service
service
class
class
class
class
9
9
9
9
name test
upstream
max-burst 9999
downstream
This workaround does not survive a CMTS reload.
Certain models of subscriber equipment fail to establish PPP over Ethernet
(PPPoE) sessions because the cable modem termination system (CMTS) proceeds
to Point-to-Point Protocol (PPP) Link Control Protocol (LCP) negotiation without
sending PPPoE Active Discovery Session-confirmation (PADS) first. A detailed
debugging suggests that the CMTS attempts to send the PADS to a wrong
(nonexistent) service identifier (SID), instead of the correct one:
Nov 16 11:02:32.890: No sid instance for SID # with MAC ####.####.####
on Cable#/#
This issue occurs on post Cisco IOS Release 12.2(11)BC3c releases on a
Cisco uBR7200 CMTS configured to terminate PPPoE.
Workaround: Revert to Cisco IOS Release 12.2(11)BC3c or earlier releases. In
addition, after the CMTS selects the SID value at random, the subscriber has a
chance to establish PPPoE session(s) if they keep trying long enough.
CSCsc58373
The cable modem termination system (CMTS) should send random MPEG NULL
frames because certain chipset cable modems might not get a lock at the DS
256QAM signal.
There are no known workarounds.
CSCsc68462
When payload header suppression (PHS) is used with PacketCable telephony, the
downstream PHS index is set incorrectly, resulting in no downstream voice.
There are no known workarounds.
CSCsc75949
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when an access list in a cable match statement is modified, and
the interface is shut.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
289
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(13a)BC1
Table 79 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC1
release.
Table 79
Open Caveats for Cisco IOS Release 12.3(13a)BC1
DDTS ID Number
Description
CSCei08802
In rare situations, a spurious read access error occurs on the Network Processing
Engine (NPE) of a Cisco VXR cable modem termination system (CMTS) running
Cisco IOS Release 12.3(9a)BC4. The rare situation is when a modem is stuck in
init(d), over 20-25 attempts have been made to register with the CMTS, and 24 SID
REG timeouts occur for the same modem.
This issue occurs when a modem stuck in init(d) makes multiple attempts to
register, and when a registration attempt is in sync with the 24-hour sid reg timeout
of the modem. The modem is unprovisioned on the Dynamic Host Configuration
Protocol (DHCP) server - that is why the multiple DHCP attempts fail.
Workaround: If you reprovision the modem so that it succeeds with DHCP, the
problem does not occur.
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using cable monitor on the MC16C
card.
There are no known workarounds.
CSCei25309
The cable monitor and MC16C card do not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
service identifier (SID) option and map-grant.
There are no known workarounds.
CSCsb02279
The router loses upstream traffic when running a voice call with a concurrent ping.
This issue occurs on Cisco IOS Release 12.3(9)BC3 with an MC28u or MC16c
card; this issue does not occur on Cisco IOS Release 12.2(15)BC2f with an MC16c
card.
There are no known workarounds.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC-address-based cable monitor does
not show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb24464
When the show interfaces x/y command is issued on the Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor the output values at the bundle interface.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
290
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Caveats for Cisco IOS Release 12.3 BC
Table 79
Open Caveats for Cisco IOS Release 12.3(13a)BC1 (continued)
DDTS ID Number
Description
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsb30270
The Cisco uBR7200VXR with MC28U style line cards has an internal 127.x.x.x
network that is used for inter line card communication.
This network is errantly advertised by IP routing protocols when the redistribute
connected [subnets] command is specified under the routing protocol’s
configuration paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands achieves this goal for an Open Shortest Path First (OSPF)
process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
CSCsb36687
Best effort traffic throughput is degraded when Unsolicited Grant Services with
Activity Detection (UGS-AD) service flows are provisioned and active on a
particular upstream. Best effort traffic seems to be not using bandwidth reserved
for UGS-AD, even though there is no traffic matching associated classifiers and
service flows have switched to Real Time Polling (rtPS) mode.
This problem affects traffic on every upstream with active UGS-AD service flows.
There are no known workarounds.
CSCsb40202
The current implementation of cable filter groups allows a cable modem (CM) or
customer premises equipment (CPE) device to bypass filters.
There are situations when this issue can be triggered:
1.
The multiple service operator (MSO) configures the cable modem termination
system (CMTS) with default cable filter groups using the cable submgmt
default filter-group command and points them to a group ID that does not
exist. IOS will not give a warning, and the device is completely open.
2.
DOCSIS1.1 provisioned CMs have TLV 37 configured, but point to a group ID
that does not exist. IOS gives no warning, and the device is completely open.
In situations where a group ID does not exist, the default behavior of IOS should
probably be deny all (the behavior of traditional ACLs) instead of the current
permit all.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
291
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(13a)BC1
Table 80 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC1
release.
Table 80
Resolved Caveats for Cisco IOS Release 12.3(13a)BC1
DDTS ID Number
Description
CSCeb62508
Disk corruption occurs to file system meta data (such as the File Allocation Table
(FAT) and directory entries.)
This issue occurs because of disk I/O errors, slow responses, or simultaneous
accesses by multiple file systems.
Workaround: Avoid multiple accesses to a disk.
CSCef96146
Frequent log messages are generated about a problem with one of the fans:
%ENVM-3-BLOWER: Fan 1 may have failed
The fan appears to be working correctly with no cooling problem.
This issue occurs only on Cisco uBR7200 routers running a Cisco IOS
Release 12.2(15)BC2, such as 2a or 2b.
There are no known workarounds.
CSCeg74394
The primary and backup Fast Ethernet (FE) or Gigabit Ethernet (GE) interfaces go
into admin shutdown after a reload.
When the router is coming backup after a reload, the console displays Ethernets
coming up and then going down, followed by a “shutdown” notice under the
configuration for both interfaces. In addition, one of the Ethernet interfaces loses
its configured IP address and “no ip address” appears in the interface configuration.
This issue occurs only if a higher number FE or GE interface, such as FE0/3 or
GE0/3, is configured as primary while a lower number interface, such as FE 0/2 or
GE0/2, is configured as backup.
This does not occur when the situation is reverse: when a lower number Ethernet is
configured as primary, and a higher number Ethernet is configured as backup.
There are no known workarounds.
CSCeh03165
A Cisc uBR router experiences an unexpected reload when the cable arp debug
command, followed by a clear arp command, is executed, or when only the clear
arp command is executed.
There are no known workarounds.
CSCeh04755
When the reload command is specified for a router, the router unexpectedly enters
ROMmon mode and generates the following error message:
%SYS-5-RELOAD: Reload requested by console.
Reload Reason: Reload command.
monitor: command “boot” aborted due to user interrupt
rommon 1 >
This issue occurs only on a Cisco 7200 router with an NPE-G1 or a
Cisco uBR7246VXR router with a Cisco uBR-NPE-G1.
Workaround: Enter the confreg 0x2002 command.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
292
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 80
Resolved Caveats for Cisco IOS Release 12.3(13a)BC1 (continued)
DDTS ID Number
Description
CSCeh13489
A router resets its Border Gateway Protocol (BGP) session.
This issue occurs when a Cisco router that peers other routers receives an
Autonomous System (AS) path with a length that is equal to or greater than 255.
When the router receives an update with an excessive AS path value, the prefix is
rejected and an event is recorded in the log.
Workaround: Configure the bgp maxas limit command so that the maximum
length of the AS path is a value below 255.
CSCei25374
Cable modems being load balanced between cable line cards take a long time to
come online. Modems are stuck in the “pending” state. This state appears in the
output of the show cable load-balance pending command.
Affected modems have duplicate entries in the pending table and are being moved
back and forth between different line cards.
This issue occurs when load balancing is configured between CiscoWith Cisco IOS
Release 12.3(13)BC,uBR-MC28U line cards and a cable modem is directed by a
line card to move to a second line card. However, by the time the modem is moved
to the second line card, the second line card has enough modems online and directs
the modem to move back, or to yet another line card.
Workaround: Configure a large minimum-threshold for load balancing with the
cable load-balance group group-number threshold load minimum
minimum-threshold command.
To make the cable modems stuck in the pending state come online, execute the
clear cable load-balance state command.
CSCei30261
The cable modem termination system (CMTS) wrongly sends a payload header
suppression (PHS) error set in its response when there are no PHS rule errors.
There are no known workarounds.
CSCei32125
The cable monitor command is not configured on the MC28U CLC.
This issue occurs when a cable monitor command that contains no space between
the output interface name and slot/subslot is sent from the Network Processing
Engine (NPE) to the MC28U; the MC28U CLC rejects the command. If there is
space between the interface name and its slot/subslot, the command is accepted by
the CLC.
For example:
“cable monitor interface gi0/2 ...” fails, and “cable monitor interface gi 0/2 ...”
passes.
Workaround: When entering a cable monitor command, enter a space between the
output interface name and the slot/subslot of the command.
CSCei49132
Traceback occurs on the Network Processing Engine (NPE) in a Cisco VXR router
when the cable modem termination system (CMTS) reloads and after the MC28U
card is up and running.
This issue occurs when CMON:ACL is configured on the CMTS.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
293
Caveats for Cisco IOS Release 12.3 BC
Table 80
Resolved Caveats for Cisco IOS Release 12.3(13a)BC1 (continued)
DDTS ID Number
Description
CSCei51209
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when unconfiguring Transparent LAN Service (TLS) after an
online insertion and removal (OIR) of the WAN interface.
Workaround: Ensure that the WAN interface comes up after OIR, then remove the
TLS configuration.
CSCei51424
When polling certain objects in the docsIfMIB, IOS locks out interrupts for an
unusually long period of time.
This issue occurs because of the polled reading of a device across a slow data bus.
Workaround: Configure the cable modem termination system (CMTS) to prohibit
Simple Network Management Protocol (SNMP) reads of this particular object.
For example:
snmp-server view noarp 1.3.6.1.2.1.10.127.1.1.1.1 excluded
snmp-server view noarp iso include
snmp-server community "public" view noarp ro
CSCei61732
Cisco IOS permits arbitrary code execution after exploitation of a heap-based
buffer overflow vulnerability. Cisco has included additional integrity checks in its
software, as further described below, that are intended to reduce the likelihood of
arbitrary code execution.
Cisco has made free software available that includes the additional integrity checks
for affected customers.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20051102-timers.shtml.
CSCei85762
The cable modem termination system (CMTS) reports the following error when
entering the cable downstream subs-traffic-mgmt command:
%IP PIM must be enabled on virtual interface Bundle1 for tunnel traffic
to get forwarded
%Error: DSG client list 0 is not defined yet.
There are no known workarounds.
CSCei85808
When the show cable subscriber-usage command is entered, the system does not
pause between screens with the “--More--” prompt.
There are no known workarounds.
CSCei86312
The cable modem termination system (CMTS) fails to send classifier information
for the upstream to the termination side of the SMDS Interface Protocol (SIP)
Video phone call.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
294
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 80
Resolved Caveats for Cisco IOS Release 12.3(13a)BC1 (continued)
DDTS ID Number
Description
CSCei88999
When a Policy Server sends the cable modem termination system (CMTS) a
gate-set that results in the gate being in an ACTIVE state, and billing information
is added to the gate-set, the CMTS unexpectedly reloads if the cable modem (CM)
sends an -rsp to the Dynamic Service Addition (DSA) request sent by the CMTS.
In normal cases, the CM should not send an -rsp to the DSA request. Several checks
have been put in place to verify the parameters and ensure that the number of
service flows has not been exceeded. However, some cable modems may still send
an -rsp to a DSA. If an -rsp is sent, the event management code generates an event
message after the gate has been deleted.
Workaround: Because it cannot be determined when the CM will send an -rsp, the
best workaround is to not use EM at this time.
CSCei90582
A service policy cannot be configured on a virtual bundle interface. An error
message is returned when the command is entered.
This issue occurs when configuring a virtual bundle interface using Cisco IOS
Release 12.3(13a)BC or later.
There are no known workarounds.
CSCej34349
PacketCable Multimedia (PCMM) gates are left without the timer running and can
use up gate resources when used with a legacy card.
Workaround: Enter the clear packet gate all command. However, be aware that
this command clears all gates and can impact service.
CSCsa54516
Baseline Privacy Interface (BPI)-enabled modems shift from online(pt) to
online(pk), and traffic is not encrypted.
During this state, the traffic encryption key (TEK) request message is blocked and
is not received by the cable modem termination system (CMTS).
Workaround: Reboot the CMTS.
CSCsa93574
On a CiscoWith Cisco IOS Release 12.3(13)BC,uBR7246 router, the following
message appears while running ubr7200-ik8s-mz.122-15.BC2f:
%SYS-3-INVMEMINT: Invalid memory action (free) at interrupt level
-Traceback= 60886E40 60581654 605816C0 6058277C 604FE8B0 604BC46C
6058EE1C 6058F360 605972E0 6059AE38 60590870 605A0468
There are no known workarounds.
CSCsb02366
The quality of service (QoS) Prov for DOCSIS 2.0 cable modems shows DOCSIS
1.0 or DOCSIS 1.1 because the major difference between a modem running in
DOCSIS 2.0 mode as opposed to DOCSIS 1.0/1.1 mode is the physical layer and
not the QoS provisioning.
However, to be consistent, the “DOC2.0” column under “QoS Provision” should be
removed from show cable modem mac summary command display.
In addition, a show cable modem phy summary command should be added to
provide a quick summary of the cable modems in each phy mode on each interface.
CSCsb03623
The snmpwalk of cdxIfCmtsServiceOutOctets counter reports a value of 0 for
interfaces connected to cable modems even though there is traffic on the interface.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
295
Caveats for Cisco IOS Release 12.3 BC
Table 80
Resolved Caveats for Cisco IOS Release 12.3(13a)BC1 (continued)
DDTS ID Number
Description
CSCsb27921
The QoS parameter in an event message is set to 00 00 00 00 when the QoS bitmask
is set to 0.
The above behavior is a constant; no special condition is required.
There are no known workarounds.
CSCsb33711
A Cisco uBR7200 router with an SRP interface unexpectedly reloads upon an
online insertion and removal (OIR) of the SRP interface.
This issue occurs on Cisco IOS Release 12.3(09a)BC.
There are no known workarounds.
CSCsb42361
A Cisco uBR7200 series cable modem termination system (CMTS) reports high
CPU usage in the IP Background process after adding a secondary IP address to a
cable or bundle interface.
The issue occurs when the number of Address Resolution Protocol (ARP) entries
on the interface being configured is in the tens of thousands.
The number of ARP entries on each interface can be approximately gauged using
the show adjacency summary command.
Workaround: Ensure that secondary IP addresses are added during a maintenance
window.
Alternative workaround: Segment the CMTS into small cable interface bundle
groups, or to use separate subinterfaces so that a lower number of modems and
customer premises equipment ARP entries are linked to each subinterface.
CSCsb44190
When the server does not reply properly, CMTS METERING collection Process
messages and traceback occur, but no unexpected reloads.
This issue occurs under the following conditions:
•
SAMIS configuration on the Cisco uBR7200 router
•
Server does not reply properly
Workaround: Restart the server for proper reply.
CSCsb52780
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when the WAN interface is not present because of the online
insertion and removal (OIR), and the cable modems (CMs) participating in L2VPN
(that are mapped to this WAN interface) are being initialized.
There are no known workarounds.
CSCsc07632
Modifying a downstream Gate with classifier information always fails, returning a
Gate-Set-Error.
Workaround: Remove the downstream Gate and make a new one rather than
modifying the original one.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
296
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(13a)BC
Table 81 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC
release.
Table 81
Open Caveats for Cisco IOS Release 12.3(13a)BC
DDTS ID Number
Description
CSCef96146
Frequent log messages are generated about a problem with one of the fans:
%ENVM-3-BLOWER: Fan 1 may have failed
The fan appears to be working correctly with no cooling problem.
This issue occurs only on Cisco uBR7200 routers running Cisco IOS
Release 12.2(15)BC2, such as 2a or 2b.
There are no known workarounds.
CSCeh97639
A router running Cisco IOS Release 12.3(9a)BC reloads due to a bus error.
There are no known workarounds.
CSCei08802
In a rare situation a read spurious access will occur on the Network Processing
Engine (NPE) of a Cisco VXR cable modem termination system (CMTS) with
Cisco IOS Release 12.3(9a)BC4. The rare situation is when a modem is stuck in
init(d), makes over 20-25 attempts to register with the CMTS, and the 24 SID REG
timeout occurs for the same modem.
This issue occurs when a modem stuck in init(d) makes multiple attempts to
register, and when a registration attempt is in sync with the 24-hour sid reg timeout
of the modem. The modem is also un-provisioned on the Dynamic Host
Configuration Protocol (DHCP) server - that is why the multiple DHCP attempts
fail.
Workaround: Re-provision the modem causing it to succeed with DHCP and then
the problem cannot occur.
CSCei25308
The broadcast address 01e0.2f00.0001 no longer captures Upstream Channel
Descriptors (UCDs) or MAP messages when using the cable monitor on the
MC16C card.
There are no known workarounds.
CSCei25309
The cable monitor and MC16C card do not operate correctly. Initial ranging is no
longer captured, or the station main map message is not output when specifying the
service identifier (SID) option and map-grant.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
297
Caveats for Cisco IOS Release 12.3 BC
Table 81
Open Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCei25374
Cable modems being load balanced between cable line cards take a very long time
to come online. Modems are stuck in “pending” state according to the output of the
show cable load-balance pending command.
Affected modems have duplicate entries in the pending table and are being moved
back and forth between different line cards. Modems may be released from this
state and will come online if the clear cable load-balance state command is
executed.
The problem occurs when a cable modem is directed by a line card to move to a
second line card, but by the time the modem is moved, the second line card has
enough modems online to direct the modem to move back, or to yet another line
card.
The problem occurs when load balancing is configured between
Cisco uBR-MC28U line cards.
Workaround: Configure a large minimum-threshold for load balancing with the
cable load-balance group group-number threshold load minimum
minimum-threshold command.
To make the cable modems stuck in the pending state come online, execute the
clear cable load-balance state command.
CSCei33120
Some enhancements are being made to the cable modem termination system
(CMTS) cable monitor feature with ACL.
There are no known workarounds.
CSCei51209
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when unconfiguring Transparent LAN Service (TLS) after an
online insertion and removal (OIR) of the WAN interface.
Workaround: Ensure that the WAN interface comes up after OIR, then remove the
TLS configuration.
CSCsa54516
Baseline Privacy Interface (BPI)-enabled modems shift from online(pt) to
online(pk), and traffic is not encrypted.
During this state, the traffic encryption key (TEK) request message is blocked and
is not received by the cable modem termination system (CMTS).
Workaround: Reboot the CMTS.
CSCsa63516
The following traceback occurs during a test run, which includes maximum
concurrent active voice calls on all upstreams with data traffic injected from the
customer premises equipment (CPE) behind the cable modem:
SLOT 3/0: Feb 14 10:11:00.114 EST: %SCHED-3-STUCKMTMR: Sleep with
expired managed timer 62C7942C, time 0x31FB2BFC (00:00:00 ago).
-Process= "Dynamic Services Timer Process", ipl= 4, pid= 37
-Traceback= 60327044 6032749C 60447AE4
The traceback occurs only when the offered load (voice + data) exceeds the
maximum bandwidth available on the upstreams.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
298
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 81
Open Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCsa65326
On a Cisco uBR7246VXR router running Cisco IOS Release 12.2(15)BC2e, when
using VPN routing/forwarding instances (VRFs) and with cable source-verify
dhcp configured on a subinterface, the customer premises equipment (CPE)
addresses of interfaces associated with VRFs are missing in the cable host table.
All traffic from VRF users gets dropped.
The CPE device behind the cable modem gets an IP address but does not show the
IP address in the host table.
Workaround: This problem does NOT occur if the dhcp option is removed in cable
source-verify or if the cable source-verify command is removed from the cable
modem termination system (CMTS).
CSCsa74396
Telco Return host shows up with all 0s in the MAC address. When trying to clear
host, the following error occurs:
Router# clear cable host xx.xx.xx.xx
Overlapping subnets.
Please reenter command with the VRF specified router.net
There are no known workarounds.
CSCsb01193
A MC-16U card reloads unexpectedly on a Cisco uBR7246VXR router running
Cisco IOS Release 12.3(9)BC3.
The circumstances under which this happens are at present undetermined.
There are no known workarounds.
CSCsb02279
Using Cisco IOS Release 12.3(9)BC3 and an MC28u card, upstream traffic is
eventually lost when running a voice call with a concurrent ping. This issue is not
present when running Cisco IOS Release 12.2(15)BC2f with a MC16c card; but is
present on the MC16c card running Cisco IOS Release 12.3(9)BC3.
There are no known workarounds.
CSCsb03623
The snmpwalk of cdxIfCmtsServiceOutOctets counter reports a value of 0 for
interfaces connected to cable modems even though there is traffic on the interface.
There are no known workarounds.
CSCsb10094
Although the cable intercept command is applied in configuration mode it does
not take effect on the Broadband Processing Engine (BPE) card. This is due to the
Interprocess communications (IPC) message getting dropped from the Network
Processing Engine (NPE) to the BPE.
This issue occurs on a Cisco uBR7246VXR router running Cisco IOS
Release 12.3(9a)BC2 with the cable intercept command applied to a BPE card.
Workaround: Re-apply the configuration cable intercept command.
CSCsb24406
With Cisco IOS Release 12.3(13)BC, a MAC-address-based cable monitor does
not show packets from service identifiers (SIDs) other than the primary. This
functionality no longer works on legacy line cards.
There are no known workarounds.
CSCsb24464
When the show interfaces x/y command is issued on the Cisco VXR router, the
output values are not displayed. The output values are displayed at the bundle
interface.
Workaround: Monitor these values at the bundle interface.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
299
Caveats for Cisco IOS Release 12.3 BC
Table 81
Open Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCsb25448
A Cisco uBR7246VXR router unexpectedly reloads multiple times over a 2-week
period.
There are no known triggers or cause for this issue.
There are no known workarounds.
CSCsb27201
Upstream raw bandwidth utilization for Unsolicited Grant Services (UGS) flows
(voice) exceeds the Admission Control configuration.
There are no known workarounds.
CSCsb27203
With no Best Effort (BE) traffic, Unsolicited Grant Services (UGS) traffic
encroaches upstream (US) bandwidth exclusively reserved for BE data.
Workaround: Configure Admission Control (AC) exclusively for UGS traffic.
CSCsb27648
Multiple Qos_reserve Qos_commits appear on a RADIUS packet when
intercepting packets in PacketCable.
This issue occurs when the cable modem termination system (CMTS) is configured
for PacketCable and the Gate_set needs to be received.
There are no known workarounds.
CSCsb27921
The QoS parameter in the event message is set to 00 00 00 00 when the QoS
bitmask is set to 0.
The above behavior is a constant; no special condition is required.
There are no known workarounds.
CSCsb30270
A Cisco uBR7200VXR router with MC28U style line cards has an internal
127.x.x.x network that is used for inter line card communication, and this network
is errantly advertised by IP routing protocols when the redistribute connected
[subnets] command is specified under the routing protocol’s configuration
paragraph.
Workaround: Configure a route-map that prevents the accidental redistribution of
127.x.x.x network numbers into routing protocols. For example, the following
configuration commands will achieve this goal for an Open Shortest Path First
(OSPF) process with a process ID of 1:
access-list 10 permit 127.0.0.0 0.255.255.255
!
route-map Stop-127.x.x.x deny 10
match ip address 10
!
route-map Stop-127.x.x.x permit 20
!
router ospf 1
redistribute connected subnets route-map Stop-127.x.x.x
!
end
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
300
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 81
Open Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCsb32281
Customer configured spectrum groups on the upstream (US) on MC28U should be
able to get reported signal-to-noise ratio (SNR) values. The intention is not to make
the modems hop, the spectrum groups are just 3,2MHz wide, using the same
frequency as before the change.
About 1 time out of 10 all the modems on the upstream that get the spectrum group
assigned will go offline. These are modems from multiple brands, so it is not
modem related. ALL modems on the affected US will go offline.
Cable-Interface (before the change):
cable upstream 0 connector 0
cable upstream 0 frequency 19600000
cable upstream 0 ingress-noise-cancellation 200
cable upstream 0 power-level 4
cable upstream 0 channel-width 3200000 3200000
cable upstream 0 minislot-size 2
cable upstream 0 range-backoff 6 9
cable upstream 0 data-backoff automatic
cable upstream 0 modulation-profile 43
no cable upstream 0 shutdown
The bands are configured at just 3.2k wide to prevent making the modems hop.
cable
cable
cable
cable
spectrum-group
spectrum-group
spectrum-group
spectrum-group
19
23
30
40
band
band
band
band
18000000
21904000
28400000
38400000
21200000
25104000
31600000
41600000
4
4
4
4
There are no known workarounds.
CSCsb36687
Best effort traffic throughput is degraded when Unsolicited Grant Services with
Activity Detection (UGS-AD) service flows are provisioned and active on
particular upstream. Best effort traffic seems not to be using bandwidth reserved
for UGS-AD, even though there is no traffic matching associated classifiers and
service flows have switched to Real Time Polling (rtPS) mode.
This problem is affecting traffic on every upstream with active UGS-AD service
flows.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
301
Caveats for Cisco IOS Release 12.3 BC
Table 81
Open Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCsb39781
A Cisco uBR7200 router unexpectedly reloads because of a bus error at a valid
address.
The address corresponds to an address that lies within the main:text region. This
can be verified in the show region output.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.2(15)BC2e
There are no known workarounds.
CSCsb40202
The current implementation of cable filter groups allows a cable modem (CM) or
customer premises equipment (CPE) device to bypass filters.
There are situations when this issue can be triggered:
1.
The multiple service operator (MSO) configures the cable modem termination
system (CMTS) with default cable filter groups using the cable submgmt
default filter-group command and points them to a group ID that does not exist.
IOS will not give a warning, and the device is completely open.
2.
DOCSIS1.1 provisioned CMs have TLV 37 configured, but point to a group ID
that does not exist. IOS gives no warning, and the device is completely open.
In situations where a group ID does not exist, the default behavior of IOS should
probably be deny all (the behavior of traditional ACLs) instead of the current
permit all.
There are no known workarounds.
Resolved Caveats for Release 12.3(13a)BC
Table 82 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(13a)BC
release.
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC
DDTS ID Number
Description
CSCef19578
The no debug cable map command does not work to turn off the debug cable map.
Workaround: Use the undebug all command (aliased to “u all”).
CSCef20890
A Cisco uBR7246VXR router running Cisco IOS Release 12.2(15)BC1 reloads
unexpectedly due to a bus error.
There are no known workarounds.
CSCef27968
Small memory leaks occur on a Cisco uBR7200 series router when performing an
online insertion and removal (OIR) of a MC28U or MC28C Cable line card.
This issue occurs on a Cisco uBR7200 series router that runs Cisco IOS
Release 12.2(15)BC2 when OIR is performed on the cable line card of MC28C or
MC28U.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
302
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCef31956
Improvements have been made to Reverse Address Resolution Protocol (ARP)
lookup on the cable modem termination system (CMTS) for modem bring up.
There are no known workarounds.
CSCef45655
To facilitate understanding the operational condition of a cable modem termination
system (CMTS), the following summary commands have been added in Cisco IOS
Release 12.3BC and later.
These commands are generally available from the CLI:
show cable modem summary total
show cable modem vendor summary
show cable modem mac summary
show cable modem rogue
show cable qos profile
There are no known workarounds.
CSCef46191
A specifically crafted Transmission Control Protocol (TCP) connection to a telnet
or reverse telnet port of a Cisco device running Internetwork Operating System
(IOS) may block further telnet, reverse telnet, Remote Shell (RSH), Secure Shell
(SSH), and in some cases Hypertext Transport Protocol (HTTP) access to the Cisco
device. Telnet, reverse telnet, RSH and SSH sessions established prior to
exploitation are not affected.
All other device services will operate normally. Services such as packet
forwarding, routing protocols and all other communication to and through the
device are not affected.
Cisco will make free software available to address this vulnerability.
Workarounds, identified below, are available that protect against this vulnerability.
The Advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtml
CSCef59093
The Cisco uBR-MC28U cable interface line card crashes in the Cisco uBR7200
series cable modem termination system (CMTS) while running Cisco IOS
Release 12.2(15)BC2b.
The issue only occurs with an MC28U line card. An MC16C in the same chassis
works correctly.
There are no known workarounds.
CSCef70739
A “MAXMEMORY USED Reached maximum amount of memory allocated for
stile” error is displayed at the console and the “Active links” for the show ip nbar
resources command shows 4 GB plus.
This issue occurs when the NBAR feature is activated (that is, when a match
protocol protocol-name command is included in a policy map), or the ip nbar
protocol-discovery command is applied on an interface.
Workaround: Enter a no ip nbar resources command to reset the active links back
to zero.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
303
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCef73242
A Cisco uBR7200 series cable modem termination system (CMTS) running
Cisco IOS Release 12.2(15)BC2b does not guarantee configured quality of service
(QoS) levels on downstream dynamic service flows in Voice over IP (VoIP)
networks.
The issue occurs with very high Service Flow Identifiers (SFIDs) (between 32768
and 65535), and when cable modems are provisioned with non-zero active QoS
timeout.
Workaround: Increase the bandwidth for Best Effort (BE) flow.
CSCef74063
A router crashes with the error condition that the gate is freed on the Route
Processor (RP), but not the line card, prior to the resource being allocated through
the DSA-REQ from the Embedded Media Terminal Adapter (eMTA).
This issue occurs because a Gate lookup failure on the RP causes illegal access to
a stale gate entry pointer, and crashes the RP.
This issue does not affect release trains prior to Cisco IOS Release 12.3(9)BC.
There are no known workarounds.
CSCef79717
The default fair-queue command changes the queueing strategy under cable
interfaces from the default of WFQ to FIFO. This issue occurs with Cisco IOS
Release 12.2(15)BC2c and earlier releases.
Workaround: Configure fair-queue under the cable interface to change the queueing
strategy from FIFO back to the default of FIFO.
CSCef80943
Cisco IOS on MC28U or MC520 cable line card unexpectedly reloads. The stack
in the crashinfo file contiguously lists 17 or more IP addresses in a secondary
address range configured for the chassis. The IP addresses are addresses of
customer premises equipment (CPE) behind a single modem.
The unexpected reload only occurs when Simple Network Management Protocol
(SNMP) queries that list or count CPE IP addresses are executed. There must be
more than 16 CPEs behind a cable modem to cause a stack overwrite. If there are
23 or more CPEs, the stack overwrite is severe enough to unexpectedly reload.
Workaround: Change the cable modem config file to allow a maximum of 16 CPEs
behind a modem.
Alternative Workaround: Stop all SNMP queries for CPE IP addresses. Stop
queries for the docsIfCmtsCmStatusEntry SNMP table.
CSCef86784
Enabling DOCSIS traps using the snmp-server enable traps docsis-cmts
command results in a traceback.
There are no known workarounds.
CSCef86926
On an MC28U line card with advanced spectrum management, modulation change
does not occur when the carrier-to-noise ratio (CNR) is below the configured
thresholds.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
304
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCef90168
When using Transparent LAN Service (TLS) in a non-Baseline Privacy Interface
(BPI) environment, it is possible for traffic to flow between different virtual private
networks (VPNs).
Workaround One: Use the feature on BPI-enabled modems only.
Workaround Two: Isolate the remote networks with a gateway/firewall router.
CSCef95748
Modems connected to a slave interface fail to reach the maintenance state if there
is a different shared secret in the master interface. Modems can reach the
maintenance state with a config file with a wrong shared secret if it matches the
shared secret in the master interface or if the master is not configured with the
shared secret.
This issue occurs only when interface bundling is configured and a dynamic shared
secret is enabled in the master interface.
There are no known workarounds.
CSCef96317
On an MC16c card on a Cisco uBR7246VXR router running the Cassatt image, no
downstream bandwidth is reserved for voice signaling and bearer packets.
This issue occurs because in DOCSIS 1.0+ only partial information about the
service flow (only the peak rate) is supplied; the Committed Information Rate
(CIR) and priority are not supplied.
This code fix ensures that ToS 3/5 supplies:
1.
Priority 3
2.
CIR = peak rate
All other ToSs (0,1,2,4,6,7) will have only a peak rate (CIR=0, priority =0).
There are no known workarounds.
CSCeg01817
A Cisco uBR7246VXR router running Cisco IOS Release 12.2(15)BC2a crashes
due to memory corruption issues. The trigger is unknown.
There are no known workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
305
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCeg11416
A cable-modem on a distributed line card displays as “not registered” on the
Network Processing Engine (NPE) but displays as “online” on the line card. A
sample router log is shown below. Both commands are run on the NPE; the first
command gets data from an NPE table, the second command gets data from the
distributed line card. When a cable modem (CM) enters this out-of-sync situation,
packets from the CM are silently dropped by the cable modem termination system
(CMTS).
Router# show cable modem 0007.0e01.7d9d
MAC Address
IP Address
I/F
MAC
Prim RxPwr
Num BPI
State
Sid (dB)
CPE Enb
Cable modem with MAC address 0007.0e01.7d9d not registered.
Router# show cable modem | incl 0007.0e01.7d9d
MAC Address
IP Address
I/F
MAC
Prim RxPwr
Num BPI
State
Sid (dB)
CPE Enb
0007.0e01.7d9d 192.168.0.1
C4/0/U0
online
3
0.00
0
N
Timing
Offset
Timing
Offset
5701
This issue occurs on a Cisco uBR7200 router running Cisco IOS Releases
12.3(9a)BC and 12.2(15)BC2c. The CMTS appears to be running normally for
about 1 week before the problem occurs.
Workaround: This problem is difficult to detect because no message is displayed on
the CMTS when the situation occurs. The only known workaround is to run a script
that scans the MAC addresses of CMs, and if the situation is detected, reset the CM
CSCeg14790
The output from the show inventory command is not always correct.
Workaround: Use the show c7200 or show diags commands instead.
CSCeg24134
The Simple Network Management Protocol (SNMP) agent in Cisco uBR7200
routers running Cisco IOS Release 12.2(15)BC2 and later won’t return values for
the MIB table ipNetToMediaTable, even if there are no SNMP views configured.
Workaround: Cisco IOS Release 12.2(15)BC1 seems to work properly.
CSCeg27950
The FLAP-LIST is not aging properly in Cisco IOS Release 12.2(15)BC2c; it does
test properly with Cisco IOS Release 12.2(15)BC2b.
There are no known workarounds.
CSCeg32660
Extra Unsolicited Grant Services (UGS) grants are being sent by the cable modem
termination system (CMTS) scheduler. This causes robotized voice with certain
brands of embedded Media Terminal Adapters (MTAs).
This issue occurs on a Cisco uBR7246VXR router running Cisco IOS
Release 12.2(15)BC2a and 20ms interval voice traffic.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
306
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCeg40945
The cable modem termination system (CMTS) database is not correctly updated
with the IP address of the customer premises equipment (CPE). The following
message is generated for the CPE MAC address abcd.efgh.ijkl.mnop:
Failed to find CM with SID # 0, not to glean from this DHCP packet
DHCPGLEAN abcd.efgh.ijkl.mnop cmts glean failed
This issue occurs under the following conditions:
•
Cisco uBR router is configured for Multiprotocol Label Switching (MPLS)
Virtual Private Network (VPN)
•
CPE requesting an IP address is on one cable subinterface x/0.n
•
Dynamic Host Configuration Protocol (DHCP) server is on another cable
subinterface y/0.p
•
Cable interfaces have to be different
There are no known workarounds.
CSCeg63592
When a host IP address is lingering on the cable modem termination system
(CMTS) after this host has been disconnected from its modem, and another host
tries to come online on the CMTS, this new host gets the same IP address that was
relinquished by the old host, and this new host is unreachable.
Although the new host Windows software has completed Dynamic Host
Configuration Protocol (DHCP), the host cannot send or receive any traffic.
This issue occurs when the new host is put behind the same cable modem as the old
host, but can also occur even if the new host is put behind a different modem.
Workaround: Whenever any host is disconnected from any modem on the CMTS,
the CMTS system operator should delete the host from the CMTS as follows:
clear cable host mac|IP
Thereafter, whenever any new host is connected to this CMTS and gets the same IP
address, the host will be reachable.
In addition, you should delete the modem behind the old host by using the
following command:
clear cable modem mac|IP delete
CSCeg63991
The service identifier (SID) table is corrupted on the cable modem termination
system (CMTS) when the Dynamic Host Configuration Protocol (DHCP) LQ
feature is enabled on the CMTS.
One possible cause is that bad Ethernet NIC cards in PCs with the same
mac_address are sending traffic to the CMTS. This condition can also be caused by
hackers.
Workaround: Disable the dhcp keyword in the cable source-verify dhcp command
to block the LQ feature from operation.
Alternatively, the bad NIC cards should be replaced by the customers of the
multiple service operator (MSO).
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
307
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCeg68008
Reverse Address Resolution Protocol (ARP) fails on the cable modem termination
system (CMTS) for Ethernet (WAN/LAN) interfaces.
This issue occurs on the CMTS during normal operation.
There are no known workarounds.
CSCeg71280
An unexpected reload on an MC28U card occurs without leaving behind a
crash-info file on the bootflash of the MC28U.
The bootflash appears to be correctly formatted and there is sufficient space
available.
The console message is as follows:
•
Timeout waiting for a response from slot x/0.
•
Card in slot (x) booting:
There are no known workarounds.
CSCeg76058
The internal Dynamic Host Configuration Protocol (DHCP) server on the cable
modem termination system (CMTS) is not working in the Cisco IOS
Release 12.2(15)BC2f throttle branch. Modems fail to complete DHCP— stay in
init(d). The CMTS is working correctly with the external DHCP server.
Cisco IOS Release 12.3(9a)BC1 does not show this problem for modems.
However, in this release, modems for customer premises equipment (CPE) fail to
come online with the internal DHCP server.
This issue occurs under normal working conditions.
Workaround: Use an external DHCP server.
CSCeg77626
When a wiretapped Media Terminal Adapter (MTA) is on a bundle slave interface,
the src IP address of the duplicate packets to the intercept server is 0.0.0.0.
This issue can cause problems when the intercept server sets up filters for the
incoming packets, which do not allow src address 0.0.0.0. However, the content of
the duplicated packet itself is correct.
Workaround: Disable the src ip address filter on the intercept server, or allow a
0.0.0.0 src ip address.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
308
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCeg78636
A file name or file names that are shown by the dir command are not displayed by
the show command.
This issue only occurs on the Personal Computer Memory Card International
Association (PCMCIA) ata-disk or Compact Flash devices.
If a file exists that is 0 bytes in size, it causes one file to not be displayed when the
show command is performed on the device.
The problem may also occur if the PCMCIA ata-disk card is given a soft label while
it is in a Microsoft Windows PC because soft labels have a 0 byte size on the
PCMCIA ata-disk.
Workaround: Do not create a soft label in a Microsoft Windows PC for the
PCMCIA ata-disk card. If such a label exists, use a Microsoft Windows PC to
remove the label.
If any file of size 0 bytes is displayed by the dir command on the device, delete the
file.
CSCeg84227
When the no cable dsg 0050.4d00.0007 225.0.1.1 CAS command is executed, the
cable modem termination system (CMTS) crashes and crashinfo is generated
The problem occurs on Cisco IOS Release 12.2(15)BC2e.
Workaround: Do not execute the no cable dsg 0050.4d00.0007 225.0.1.1 CAS
command.
CSCeg88558
In a 3-way call between A, B, C, where subscriber A is configured for CALEA
INTERCEPT, duplicated audio for streams A<->B and A<->C from the CMTS
have the same CCCid. Media_Reports do indicate different CCCids for the streams.
There are no known workarounds.
CSCeg89877
When loading the Cisco IOS Release 12.3(9a)BC, including the additional fix for
inter card load balancing (CSCsa48673), negative values are displayed in the show
load balancing output.
Workaround: Clear the counters.
CSCeh05706
A Cisco uBR7200 series unexpectedly reloads because of a bus error and generates
a syslog error message and tracebacks.
This issue occurs on a Cisco uBR7200 series that functions as a cable modem
termination system (CMTS) with a large number of modems during a heavy load.
There are no known workarounds.
CSCeh06084
A cable modem termination system (CMTS) running Cisco IOS
Release 12.3(9a)BC no longer returns the description “cable upstream X
description” when the following MIB object is polled.:
ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifAlias
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
309
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCeh15690
A cable modem (CM) with built in ATA for Analogue telephone gets assigned the
wrong service identifier (SID).
This issue occurs with main and redundant Cisco Network Management (CNR)
servers running image version 5.5.4 or earlier when batch mode syncing is enabled
on the CNR.
Workaround: To clear this condition on the cable modem termination system
(CMTS), enter the clear cable modem mac command, or perform a power reset of
the cable modem.
See CSCdz32049 for a better workaround to the problem on the CNR Dynamic
Host Configuration Protocol (DHCP) server.
CSCeh31926
The Network Processing Engine (NPE) on the cable modem termination system
(CMTS) unexpectedly reloads when the modem comes online on the CMTS.
This rare condition occurs when there is a service identifier (SID) database
mismatch between the NPE/Performance Routing Engine (PRE) and a distributed
cable line card. The following error messages are printed on the CMTS console
when the error happens:
Mar 7 00:21:20.919 CET: %UBR7200-3-INVALIDSIDPOSITION: Invalid SID
(7392) position for interface
Cable5/1: CM 00d0.59fa.4674:Is used by CM 0002.8af9.546f SFID 14882 SID
7391. SID container info:
start 7060 end 6757
-Traceback= 6053E1A8 6053E3A8 6053EC04 604DD7C8 6062F120 60885D80
60885D64
Mar 7 00:21:20.919 CET: %UBR10K-6-CM_INCONSISTENCY: CM state
inconsistency 0d0d.0d0d.0d0d(msgp
00d0.59fa.4674), sid 218959117 (7392), mac state 13, hwidb Cable5/1
Workaround: Shutdown the cable interface on the modem that caused the
mismatch.
CSCeh33555
The following messages appear and the cable interfaces 4/0 and 4/1 reset:
SLOT 4/0: Mar 4 20:47:43.817 UTC: %UBR7200-5-TRAFSHAPBADTIMER: Bad
timer expiry in downstream traffic shaper process, Timer 0
SLOT 4/0: Mar 4 20:48:24.837 UTC: %ALIGN-3-SPURIOUS: Spurious memory
access made at 0x60475578 reading 0x18
SLOT 4/0: Mar 4 20:48:24.837 UTC: %ALIGN-3-TRACE: -Traceback= 60475578
00000000 00000000 00000000 00000000 00000000 00000000 00000000
There are no known workarounds.
CSCeh34972
A cable modem that displays as both online using the show interfaces cable 5/1
mod 0 | inc mac command, and not registered using the show cable modem mac
command, does not respond to the ping.
This issue does not exist in Cisco IOS Release 12.3(9a)BC2.
Workaround: Enter a clear cable modem mac delete command, or reload the cable
modem.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
310
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCeh45836
In a virtual private network (VPN) when Dynamic Host Configuration Protocol
(DHCP) leases of the order of 1-2 hours are used, the cable modem termination
system (CMTS) does not clean up stale duplicate IP addressees for customer
premises equipment (CPE).
This issue occurs on VPN CMTS networks when there are short lease times on the
DHCP server.
Workaround: Reset the cable modem that owns the stale duplicate CPE entry.
CSCeh49894
Minor cleanup has been done to the cable modem termination system (CMTS)
quality of service (QoS) profile code to make it more maintainable.
There are no known workarounds.
CSCeh59830
For Simple Network Management Protocol (SNMP) tables, normally setting the
status to destroy(6) deletes the row, in both SNMP and the CLI. For
ccqmCmtsEnfRuleRowStatus, setting the status to 6, deletes the row in SNMP and
CLI, but also causes a spurious memory access error as follows:
1d05h: %SYS-5-CONFIG_I: Configured from <IP-address> by snmp
SLOT 3/0: 1d05h: %ALIGN-3-SPURIOUS: Spurious memory access made at
0x60626CB4 reading 0x90
SLOT 3/0: 1d05h: %ALIGN-3-TRACE: -Traceback= 60626CB4 6070A96C 60707E20
6070BA68 6061DE10 6061D614 60611CFC 60611ECC
SLOT 3/0: 1d05h: %ALIGN-3-TRACE: -Traceback= 60626D4C 6070A96C 60707E20
6070BA68 6061DE10 6061D614 60611CFC 60611ECC
There are no known workarounds.
CSCeh62236
The cable modem termination system (CMTS) randomly drops packets when
packet-cache and Cisco Express Forwarding (CEF) are enabled on the interface.
Workaround: Disable the packet-cache feature on the cable interface.
CSCeh97452
Cisco IOS Releases 12.3(9a) BC3 and 12.2(15)BC2g unexpectedly reload an
MC16U card in a Cisco VXR chassis only with PPP over Ethernet (PPPoE)
termination enabled on the cable modem termination system (CMTS). See also
CSCsb01193.
The CMTS cable line card functions should be made more defensive so as to not
unexpectedly reload.
There are no known workarounds.
CSCin82407
Cisco Internetwork Operating System (IOS) Software release trains 12.2T, 12.3
and 12.3T may contain vulnerabilities in processing certain Internet Key Exchange
(IKE) Xauth messages when configured to be an Easy VPN Server.
Successful exploitation of these vulnerabilities may permit an unauthorized user to
complete authentication and potentially access network resources.
This advisory will be posted to
http://www.cisco.com/warp/public/707/cisco-sa-20050406-xauth.shtml
CSCsa40275
A configure command does not set no cache L3 disable.
This issue occurs when the L3 hiding place is enabled.
Workaround: To check that the CERF function is effective, enter the show memory
cache error-recovery command. The command should show:
L3 Data cache recovery is enabled
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
311
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCsa44474
A Cisco uBR7200 router reloads due to a bus error.
There are no known workarounds.
CSCsa44591
A TACACS Transmission control Protocol (TCP) session between the router and
the ACS hangs with the single connection option.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(9a)BC.
Workaround: Remove the “single-connection” option from the TACACS+
configuration. When this issue occurs, turn off and turn on the “single connect”
option.
CSCsa44945
As many as 10% of cable modems do not come online after enabling downstream
load balancing across two downstreams on different MC28U line cards.
There are no known workarounds.
CSCsa48673
The show cable modem load-bal stat is 4294967295 (0xffffffff)
There are no known workarounds.
CSCsa48675
The unregistered modem count is too high in the show cable modem sum total
display.
There are no known workarounds.
CSCsa50341
The current configuration mode CLI comments for the TOS-overwrite feature of
DOCSIS1.0+ cable quality of service (QoS) profiles is outdated:
Router(config)# cable qos profile 100 tos-overwrite ?
<0x1-0xFF> TOS-overwrite mask byte in hex <-- ***Here***
and
Router(config)# cable qos profile 100 tos-overwrite 0x20 ?
<0x0-0xFF> TOS-overwrite value byte in hex <-- ***Here***
The current config mode options are: TOS-overwrite mask byte in hex and
TOS-overwrite value byte in hex.
These options should be changed to TOS-overwrite-mask-and byte in hex and
TOS-overwrite-mask-or byte in hex to reflect the proper behavior of IOS.
There are no known workarounds.
CSCsa50360
The current implementation of cable service classes and cable quality of service
(QoS) profiles cannot guarantee a ToS setting of 0x0. This is due to a configuration
restriction of the TOS-overwrite-mask-and byte. This value can only be set within
0x1 and 0xFF. Without the option to configure 0x0, there is no way to guarantee a
ToS value of 0x0.
There are no known workarounds.
CSCsa52992
Real Time Polling (rtPS) debug output of jitter is different than the configuration
file value.
When time wraps, wrong jitters are reported.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
312
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCsa53912
You cannot log on when a TACACS+ server is used for authentication. You get a
message that authentication fails and you are asked to enter your user name again.
This issue occurs when you make a Telnet connection to a router that is configured
for TACACS+ after you have entered your user name and your TACACS password.
Workaround: Configure the TACACS+ single connection option by entering the
tacacs-server host host-name single-connection command.
CSCsa61526
A traceback error occurs during an Address Resolution Protocol (ARP) filter
request.
This issue could have occurred during any ping timeout situation.
There are no known workarounds.
CSCsa64478
The following traceback output appears in the syslog when moving active modems
from one profile to a second profile that has quality of service (QoS):
ALIGN-3-SPURIOUS: Spurious memory access made at 0x6045488C reading 0x4
SLOT 3/0: Feb 18 10:57:59.945
%ALIGN-3-TRACE: -Traceback= 6045488C 60455368 60276608 605FCB7C
605F622C 605F63FC 00000000 00000000
-->
There are no known workarounds.
CSCsa65080
The STM counter overflows and the show cable sub over command displays a
large traffic count where there is no traffic.
This issue occurs because the STM counters exceed those defined by the quality of
service (QoS) profile.
There are no known workarounds.
CSCsa65188
A line card unexpectedly reloads when configuration changes are made to the
policy/qos configuration.
This issue occurs in configuration mode when making changes to the policy and
qos configuration.
The unexpected reload is due to accessing a ptr pointing to freed memory.
There are no known workarounds.
CSCsa67161
Applying a service-class-name with subset service-flow parameters fails and
generates the following message:
Active set is not subset of admitted set
Activation failure. Abort...
This issue occurs under the following conditions:
•
DOCSIS 1.1 is used.
•
The cable modem whose quality of service (QoS) is modified is online.
Workaround: Use the same parameters as defined in the docsis file.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
313
Caveats for Cisco IOS Release 12.3 BC
Table 82
Resolved Caveats for Cisco IOS Release 12.3(13a)BC (continued)
DDTS ID Number
Description
CSCsa79091
This syslog message contains a carriage return that is not legal:
%UBR7200-3-MACADDRERR: DHCP Msg with non unicast MAC address.
Master Interface Cable3/0 Input Interface SID = 65535 MAC =
0000.0000.0000
This issue occurs in every Cisco IOS release.
There are no known workarounds.
CSCsa86042
The default ToS over-write feature for DOCSIS 1.0 modems in Cisco IOS
Release 12.3(9a)BC2 (and previous releases) was to re-write the ToS of all
incoming traffic to a ToS of zero (that is, TOS mask = 0xFF, TOS value = 0x0).
However, in Cisco IOS Release 12.3(9a)BC3 the ToS over-write functionality has
changed.
Now, if the TOS mask is 0xFF and the TOS value is 0x0, the original ToS value
from the customer premises equipment (CPE) is maintained. In other words, ToS is
not re-written.
In addition, with the integration of these to fixes, setting the T0S mask to 0x0 and
the T0S value to 0x0 now rewrites all the ToS values back to zero.
The problem is that setting the T0S mask and T0S value to 0x0 is not maintained
in the start-up configuration and therefore is not saved after a reload. As a result,
customers that want to keep the original behavior OR want to mark all ToS values
to 0x0 can't save these settings in the configuration.
There are no known workarounds.
CSCsa86851
Intercept does not work on PRE1 when using a subinterface, and the subinterface
is needed.
There are no known workarounds.
CSCsa87032
When sending traffic from customer premises equipment (CPE) connected to a
slave interface, lease query messages are sent for a rogue CPE even when the rogue
IP database is full (5 entries per service identifier (SID)).
There are no known workarounds.
CSCsb11124
The Cisco IOS Stack Group Bidding Protocol (SGBP) feature in certain versions
of Cisco IOS software is vulnerable to a remotely-exploitable denial of service
condition. Devices that do not support or have not enabled the SGBP protocol are
not affected by this vulnerability.
Cisco has made free software available to address this vulnerability for affected
customers. There are workarounds available to mitigate the effects of the
vulnerability.
Cisco has published a Security Advisory on this issue; it is available at
http://www.cisco.com/warp/public/707/cisco-sa-20060118-sgbp.shtml
Open Caveats for Release 12.3(9a)BC8
This section documents possible unexpected behavior by Cisco IOS Release 12.3(9a)BC8 and describes
only severity 1 and 2 caveats and select severity 3 caveats.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
314
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
There are no known open caveats for Cisco IOS Release 12.3(9a)BC8.
Resolved Caveats for Release 12.3(9a)BC8
Table 83 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC8
release.
Table 83
Resolved Caveats for Cisco IOS Release 12.3(9a)BC8
DDTS ID Number
Description
CSCef67682
Reception of certain IPv6 fragments with carefully crafted illegal contents may
cause a router running Cisco IOS to reload if it has IPv6 configured. This applies
to all versions of Cisco IOS that include support for IPv6.
The system may be protected by installing appropriate access lists to filter all IPv6
fragments destined for the system. For example:
interface Ethernet0/0
ipv6 traffic-filter nofragments in
!
ipv6 access-list nofragments
deny ipv6 any <my address1> undetermined-transport
deny ipv6 any <my address2> fragments
permit ipv6 any any
This must be applied across all interfaces, and must be applied to all IPv6 addresses
which the system recognizes as its own.
This will effectively disable reassembly of all IPv6 fragments. Some networks may
rely on IPv6 fragmentation, so careful consideration should be given before
applying this workaround.
We would recommend for customers to upgrade to the fixed IOS release. All IOS
releases listed in IPv6 Routing Header Vulnerability Advisory at
http://www.cisco.com/warp/public/707/cisco-sa-20070124-IOS-IPv6.shtml
contain fixes for this issue.
CSCsa54516
Baseline Privacy Interface (BPI)-enabled modems shift from online(pt) to
online(pk), and traffic is not encrypted.
During this state, the traffic encryption key (TEK) request message is blocked and
is not received by the cable modem termination system (CMTS).
Workaround: Reboot the CMTS.
CSCsa86851
Intercept does not work on PRE1 when using subinterface, and the subinterface is
needed.
There are no known workarounds.
CSCsa93574
On a Cisco uBR7246 router, the following message appears while running
ubr7200-ik8s-mz.122-15.BC2f:
%SYS-3-INVMEMINT: Invalid memory action (free) at interrupt level
-Traceback= 60886E40 60581654 605816C0 6058277C 604FE8B0 604BC46C
6058EE1C 6058F360 605972E0 6059AE38 60590870 605A0468
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
315
Caveats for Cisco IOS Release 12.3 BC
Table 83
Resolved Caveats for Cisco IOS Release 12.3(9a)BC8 (continued)
DDTS ID Number
Description
CSCsb33711
An Cisco uBR7200 router with an SRP interface unexpectedly reloads upon an
online insertion and removal (OIR) of the SRP interface.
This issue occurs on Cisco IOS Release 12.3(09a)BC.
There are no known workarounds.
CSCsb42068
The interface-configuration is lost after restart.
This issue occurs after a reload, even though it is saved by the copy run start
command.
Workaround: Make sure that subinterfaces are not created for interfaces that will
be part of a bundle.
CSCsb42361
A Cisco uBR7200 cable modem termination system (CMTS) is reporting high CPU
in the IP Background process after adding a secondary IP address to a cable or
bundle interface.
The issue occurs when the number of Address Resolution Protocol (ARP) entries
on the interface being configured is in the order of tens of thousands.
The number of ARP entries on each interface may be approximately gauged with
the show adjacency summary command.
Workaround: Ensure that secondary IP addresses are added during a maintenance
window.
Alternative workaround: Segment the CMTS into small cable interface bundle
groups or to use separate subinterfaces so that a lower number of modems and
Customer Premise Equipment ARP entries are linked to each subinterface.
CSCsb86672
Cable modems are online, but the Media Terminal Adapter (MTA) is not getting
IPs.
Workaround: Microcode reload pxf.
CSCsc14890
A feature request has been made to enable a CLI command to define a period of
time for the cable modem termination system (CMTS) to tear down the dynamic
service flows that have not been torn down. This request is for a non-PacketCable
environment where the cable modem (CM) would send a DSD-REQ to tear down
the service flows that are no longer in use.
This issue occurs in a non-PacketCable environment where the CMs control
dynamic service setup and tear down.
There are no known workarounds.
CSCsc20755
PacketCable CALEA calls are not replicating downstream packets. The Cable
modem termination system (CMTS) is a Cisco uBR7246VXR router running
Cisco IOS Release 12.3(9a)BC3 with a MC16S cable line card).
This issue is caused by the payload header suppression (PHS) feature and happens
only on the legacy cable line cards, such as the MC16C or MC16S.
Workaround: Use a newer cable line card, such as the MC28U.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
316
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 83
Resolved Caveats for Cisco IOS Release 12.3(9a)BC8 (continued)
DDTS ID Number
Description
CSCsc26813
The multiple service operator (MSO) is sharing the hybrid fiber coaxial (HFC)
network, and the band assignment of frequency is strict. There is no extra frequency
to assign a few kHz.
Most cable operators assign two adjacent band frequencies, and these frequencies
are considered a frequency band. The coalescing adjacent bands code should be
removed.
There are no known workarounds.
CSCsc38561
When a Cisco uBR series cable modem termination system (CMTS) is configured
with the cable primary-sflow-qos11 keep [all | snmp] global configuration
command, the primary service identifier (SID) activity timer for cable modems
operating in DOCSIS 1.1 mode is reset when the modem goes offline and comes
back online.
The expected behavior is that this timer is not reset when the command is
configured.
The issue applies to cable modems operating in DOCSIS 1.1 mode when the cable
primary-sflow-qos11 keep [all | snmp] command is configured.
Workaround: Use the service-flow activity timers in the show interface cable x/y
service-flow-number command, which are not reset incorrectly.
Open Caveats for Release 12.3(9a)BC7
This section documents possible unexpected behavior by Cisco IOS Release 12.3(9a)BC7 and describes
only severity 1 and 2 caveats and select severity 3 caveats.
There are no known open caveats for the Cisco IOS 12.3(9a)BC7 release.
Resolved Caveats for Release 12.3(9a)BC7
Table 84 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC7
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
317
Caveats for Cisco IOS Release 12.3 BC
Table 84
Resolved Caveats for Cisco IOS Release 12.3(9a)BC7
DDTS ID Number
Description
CSCee45312
Remote Authentication Dial In User Service (RADIUS) authentication on a device
that is running certain versions of Cisco Internetworking Operating System (IOS)
and configured with a fallback method to none can be bypassed.
Systems that are configured for other authentication methods or that are not
configured with a fallback method to none are not affected.
Only the systems that are running certain versions of Cisco IOS are affected. Not
all configurations using RADIUS and none are vulnerable to this issue. Some
configurations using RADIUS, none and an additional method are not affected.
Cisco has made free software available to address this vulnerability. There are
workarounds available to mitigate the effects of the vulnerability.
More details can be found in the security advisory which posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050629-aaa.shtml
CSCee82448
A Cisco AS5800 Access Server sends ALIGN-3-SPURIOUS and
SSSMGR-3-NULL_INFO_STRING messages in the log.
This issue occurs on the interim Cisco IOS Release12.3(9.4).
Normal functionality is not influenced by the problem.
There are no known workarounds.
CSCef68324
Cisco Internetwork Operating System (IOS) software is vulnerable to a Denial of
Service (DoS) and potentially an arbitrary code execution attack from a specifically
crafted IPv6 packet. The packet must be sent from a local network segment. Only
devices that have been explicitly configured to process IPv6 traffic are affected.
Upon successful exploitation, the device may reload or be open to further
exploitation.
Cisco has made free software available to address this vulnerability for all affected
customers.
More details can be found in the security advisory that is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050729-ipv6.shtml.
CSCef96146
Frequent log messages are generated about a problem with one of the fans:
%ENVM-3-BLOWER: Fan 1 may have failed
The fan appears to be working correctly with no cooling problem.
This issue occurs only on Cisco uBR7200 routers running Cisco IOS
Release 12.2(15)BC2, such as 2a or 2b.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
318
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 84
Resolved Caveats for Cisco IOS Release 12.3(9a)BC7 (continued)
DDTS ID Number
Description
CSCeg74394
The primary and backup Fast Ethernet (FE) or Gigabit Ethernet (GE) interfaces go
into admin shutdown after a reload.
When the router is coming backup after a reload, the console will display Ethernets
coming up and then going down, followed by a “shutdown” notice under the
configuration for both interfaces.
This issue only occurs if a higher number FE or GE interface, such as FE0/3 or
GE0/3, is configured as primary while a lower number interface, such as FE 0/2 or
GE0/2, is configured as backup.
This issue does not occur when the situation is reversed: when a lower number
Ethernet is configured as primary and a higher number Ethernet is configured as
backup.
In addition, one of the Ethernet interfaces loses its configured IP address and “no
ip address” appears instead in the interface configuration.
There are no known workarounds.
CSCeh04755
When you reload a router by entering the reload command, the router unexpectedly
enters the ROMmon mode and generates the following error message:
%SYS-5-RELOAD: Reload requested by console.
Reload Reason: Reload command.
monitor: command "boot" aborted due to user interrupt
rommon 1 >
This issue occurs only on a Cisco uBR7200 router that is configured with an
NPE-G1 and on a Cisco uBR7246VXR router with UBR-NPE-G1.
Workaround: Enter the confreg 0x2002 command.
CSCeh13489
A router resets its Border Gateway Protocol (BGP) session.
This issue occurs when a Cisco router that peers with other routers receives an
Autonomous System (AS) path with a length that is equal to or greater than 255.
Workaround: Configure the bgp maxas limit command so that the maximum
length of the AS path is a value below 255. When the router receives an update with
an excessive AS path value, the prefix is rejected and the event is recorded in the
log.
CSCei08802
In rare situations, a spurious read access error occurs on the Network Processing
Engine (NPE) of a Cisco VXR cable modem termination system (CMTS) running
Cisco IOS Release 12.3(9a)BC4. The rare situation is when a modem is stuck in
init(d), over 20-25 attempts have been made to register with the CMTS, and 24 SID
REG timeouts occur for the same modem.
This issue occurs when a modem stuck in init(d) makes multiple attempts to
register, and when a registration attempt is in sync with the 24-hour sid reg timeout
of the modem. The modem is unprovisioned on the Dynamic Host Configuration
Protocol (DHCP) server - that is why the multiple DHCP attempts fail.
Workaround: If you reprovision the modem so that it succeeds with DHCP, the
problem does not occur.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
319
Caveats for Cisco IOS Release 12.3 BC
Table 84
Resolved Caveats for Cisco IOS Release 12.3(9a)BC7 (continued)
DDTS ID Number
Description
CSCei25374
Cable modems being load balanced between cable line cards take a long time to
come online. Modems are stuck in the “pending” state. This state appears in the
output of the show cable load-balance pending command.
Affected modems have duplicate entries in the pending table and are being moved
back and forth between different line cards.
This issue occurs when load balancing is configured between Cisco uBR-MC28U
line cards and a cable modem is directed by a line card to move to a second line
card. However, by the time the modem is moved to the second line card, the second
line card has enough modems online and directs the modem to move back, or to yet
another line card.
Workaround: Configure a large minimum-threshold for load balancing with the
cable load-balance group group-number threshold load minimum
minimum-threshold command.
To make the cable modems stuck in the pending state come online, execute the
clear cable load-balance state command.
CSCei25867
If a cable monitor command is configured on a legacy cable line card in a
Cisco uBR7200 chassis and the command involves ACL, the command disappears
after a cable modem termination system (CMTS) reload.
This issue does not occur with an MC28U or MC16U card in the same CMTS
chassis.
There are no known workarounds.
CSCei51209
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when unconfiguring Transparent LAN Service (TLS) after an
online insertion and removal (OIR) of the WAN interface.
Workaround: Ensure that the WAN interface comes up after OIR, then remove the
TLS configuration.
CSCei51424
While polling certain objects in the docsIfMIB, IOS locks out interrupts for an
unusually long period of time.
This issue is caused by the polled reading of device across a slow data bus.
Workaround: Configure the cable modem termination system (CMTS) to prohibit
Simple Network Management Protocol (SNMP) reads of this particular object.
Example:
snmp-server view noarp 1.3.6.1.2.1.10.127.1.1.1.1 excluded
snmp-server view noarp iso include
snmp-server community "public" view noarp ro
CSCei61732
Cisco IOS may permit arbitrary code execution after exploitation of a heap-based
buffer overflow vulnerability. Cisco has included additional integrity checks in its
software, as further described below, that are intended to reduce the likelihood of
arbitrary code execution.
Cisco has made free software available that includes the additional integrity checks
for affected customers.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20051102-timers.shtml.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
320
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 84
Resolved Caveats for Cisco IOS Release 12.3(9a)BC7 (continued)
DDTS ID Number
Description
CSCsa54608
The Cisco IOS Firewall Authentication Proxy for File Transfer Protocol (FTP),
and/or Telnet Sessions feature in specific versions of Cisco IOS software is
vulnerable to a remotely-exploitable buffer overflow condition.
Devices that do not support, or are not configured for Firewall Authentication
Proxy for FTP and/or Telnet Services are not affected.
Devices configured with only Authentication Proxy for HTTP and/or HTTPS are
not affected.
Only devices running certain versions of Cisco IOS are affected.
Cisco has made free software available to address this vulnerability. There are
workarounds available to mitigate the effects of the vulnerability.
This advisory will be posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050907-auth_proxy.shtml
CSCsa86042
The default ToS over-write feature for DOCSIS 1.0 modems in Cisco IOS
Release 12.3(9a)BC2 (and previous releases) was to re-write the ToS of all
incoming traffic to a ToS of zero (that is, TOS mask = 0xFF, TOS value = 0x0).
However, in Cisco IOS Release 12.3(9a)BC3 the ToS over-write functionality has
changed.
Now, if the TOS mask is 0xFF and the TOS value is 0x0, the original ToS value
from the customer premises equipment (CPE) is maintained. In other words, ToS is
not re-written.
In addition, with the integration of these to fixes, setting the TOS mask to 0x0 and
the TOS value to 0x0 will now re-write all the ToS values back to zero.
The problem is that setting the TOS mask and TOS value to 0x0 is not maintained
in the start-up configuration and therefore is not saved after a reload. As a result,
customers that want to keep the original behavior or want to mark all TOS values
to 0x0 can't save these settings in the configuration.
There are no known workarounds.
CSCsb02366
The quality of service (QoS) Prov for DOCSIS 2.0 cable modems correctly shows
DOCSIS 1.0 or DOCSIS 1.1 because of the fact that the major difference between
a modem running in DOCSIS 2.0 mode as opposed to DOCSIS 1.0/1.1 mode is the
physical layer and not the QoS provisioning.
However, to be consistent, the “DOC2.0” column under “QoS Provision” should be
removed from the show cable modem mac summary display.
Additionally, the show cable modem phy summary display should provide a
quick summary of the cable modems in each phy mode on each interface.
CSCsb03623
The snmpwalk of cdxIfCmtsServiceOutOctets counter is reporting a value of 0 for
interfaces connected to cable modems even though there is traffic on the interface.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
321
Caveats for Cisco IOS Release 12.3 BC
Table 84
Resolved Caveats for Cisco IOS Release 12.3(9a)BC7 (continued)
DDTS ID Number
Description
CSCsb27921
The QoS parameter in an event message is set to 00 00 00 00 when the QoS bitmask
is set to 0.
The above behavior is a constant; no special condition is required.
There are no known workarounds.
CSCsb52780
The cable modem termination system (CMTS) unexpectedly reloads.
This issue occurs when the WAN interface is not present because of an online
insertion and removal (OIR), and the cable modems (CMs) participating in an
L2VPN (that are mapped to this WAN interface) are being initialized.
There are no known workarounds.
Open Caveats for Release 12.3(9a)BC6
This section documents possible unexpected behavior by the Cisco IOS 12.3(9a)BC6 release and
describes only severity 1 and 2 caveats and select severity 3 caveats.
There are no known open caveats for the Cisco IOS 12.3(9a)BC6 release.
Resolved Caveats for Release 12.3(9a)BC6
Table 85 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC6
release.
Table 85
Resolved Caveats for Cisco IOS Release 12.3(9a)BC6
DDTS ID Number
Description
CSCef68324
Cisco Internetwork Operating System (IOS) software is vulnerable to a Denial of
Service (DoS) and potentially an arbitrary code execution attack from a specifically
crafted IPv6 packet. The packet must be sent from a local network segment. Only
devices that have been explicitly configured to process IPv6 traffic are affected.
Upon successful exploitation, the device may reload or be open to further
exploitation.
Cisco has made free software available to address this vulnerability for all affected
customers.
More details can be found in the security advisory that is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050729-ipv6.shtml.
Open Caveats for Release 12.3(9a)BC5
This section documents possible unexpected behavior by the Cisco IOS 12.3(9a)BC5 release and
describes only severity 1 and 2 caveats and select severity 3 caveats.
There are no known open caveats for the Cisco IOS 12.3(9a)BC5 release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
322
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Resolved Caveats for Release 12.3(9a)BC5
This section documents possible unexpected behavior by the Cisco IOS 12.3(9a)BC5 release and
describes only severity 1 and 2 caveats and select severity 3 caveats.
There are no known resolved caveats for the Cisco IOS 12.3(9a)BC5 release.
Open Caveats for Release 12.3(9a)BC4
This section documents possible unexpected behavior by the Cisco IOS 12.3(9a)BC4 release and
describes only severity 1 and 2 caveats and select severity 3 caveats.
There are no known open caveats for the Cisco IOS 12.3(9a)BC4 release.
Resolved Caveats for Release 12.3(9a)BC4
Table 86 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC4
release.
Table 86
Resolved Caveats for Cisco IOS Release 12.3(9a)BC4
DDTS ID Number
Description
CSCeg71280
An unexpected reload on a MC28U card occurs without leaving behind a crashinfo
file on the bootflash of the MC28U.
The bootflash appears to be correctly formatted, and there was sufficient space
available.
The console message is as follows:
•
Timeout waiting for a response from slot x/0.
•
Card in slot (x) booting
There are no known workarounds.
CSCeh15690
A cable modem (CM) with built in ATA for Analogue telephone gets assigned the
wrong service identifier (SID).
This issue occurs with main and redundant Cisco Network Management (CNR)
servers running image version 5.5.4 or earlier when batch mode syncing is enabled
on the CNR.
Workaround: To clear this condition on the cable modem termination system
(CMTS), enter the clear cable modem mac command, or perform a power reset of
the cable modem.
See CSCdz32049 for a better workaround to the problem on the CNR Dynamic
Host Configuration Protocol (DHCP) server.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
323
Caveats for Cisco IOS Release 12.3 BC
Table 86
Resolved Caveats for Cisco IOS Release 12.3(9a)BC4 (continued)
DDTS ID Number
Description
CSCeh32709
Customer premises equipment (CPE) devices behind cable modems (CMs) are seen
by the Cisco uBR router as having been assigned to other hosts. The same TCP/IP
address can be seen assigned to two different MAC addresses.
This issue occurs on Cisco uBR7200 routers running Cisco IOS
Release 12.3(9a)BC and 12.2(15)BC.
Workaround: To clear this condition, enter the clear cable modem mac command,
or perform a power reset of the cable modem.
CSCeh34972
A cable modem that displays as both online using the show interfaces cable 5/1
mod 0 | inc mac command, and not registered using the show cable modem mac
command, does not respond to the ping.
This issue does not exist in Cisco IOS Release 12.3(9a)BC2.
Workaround: Enter a clear cable modem mac delete command, or reload the cable
modem.
CSCeh62236
The cable modem termination system (CMTS) interface randomly drops packets
when packet-cache and Cisco Express Forwarding (CEF) are enabled on the
interface.
Workaround: Disable the packet-cache feature on the cable interface.
CSCsa65188
A line card unexpectedly reloads when configuration changes are made to the
policy/qos configuration.
The unexpected reload is due to accessing a ptr pointing to freed memory.
There are no known workarounds.
Open Caveats for Release 12.3(9a)BC3
This section documents possible unexpected behavior by the Cisco IOS 12.3(9a)BC3 release and
describes only severity 1 and 2 caveats and select severity 3 caveats.
There are no known open caveats for the Cisco IOS 12.3(9a)BC3 release.
Resolved Caveats for Release 12.3(9a)BC3
Table 87 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC3
release.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
324
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 87
Resolved Caveats for Cisco IOS Release 12.3(9a)BC3
DDTS ID Number
Description
CSCeg63592
When a host IP address is lingering on the cable modem termination system
(CMTS) after this host has been disconnected from its modem, and another host
tries to come online on the CMTS, this new host gets the same IP address that was
relinquished by the old host, and this new host is unreachable.
Although the new host Windows software has completed Dynamic Host
Configuration Protocol (DHCP), the host cannot send or receive any traffic.
This issue occurs when the new host is put behind the same cable modem as the old
host, but can also occur even if the new host is put behind a different modem.
Workaround: Whenever any host is disconnected from any modem on the CMTS,
the CMTS system operator should delete the host from the CMTS as follows:
clear cable host mac|IP
Thereafter, whenever any new host is connected to this CMTS and gets the same IP
address, the host will be reachable.
In addition, you should delete the modem behind the old host by using the
following command:
clear cable modem mac|IP delete
CSCeg63991
The service identifier (SID) table is corrupted on the cable modem termination
system (CMTS) when the Dynamic Host Configuration Protocol (DHCP) LQ
feature is enabled on the CMTS.
One possible cause is that bad Ethernet NIC cards in PCs with the same
mac_address are sending traffic to the CMTS. This condition can also be caused by
hackers.
Workaround: Disable the dhcp keyword in the cable source-verify dhcp command
to block the LQ feature from operation.
Alternatively, the bad NIC cards should be replaced by the customers of the
multiple service operator (MSO).
CSCeg76058
The internal Dynamic Host Configuration Protocol (DHCP) server on the cable
modem termination system (CMTS) is not working in the Cisco IOS
Release 12.2(15)BC2f throttle branch. Modems fail to complete DHCP— stay in
init(d). The CMTS is working correctly with the external DHCP server.
Cisco IOS Release 12.3(9a)BC1 does not show this problem for modems.
However, in this release, modems for customer premises equipment (CPE) fail to
come online with the internal DHCP server.
This issue occurs under normal working conditions.
Workaround: Use an external DHCP server.
CSCeg77626
When a wiretapped Media Terminal Adapter (MTA) is on a bundle slave interface,
the src IP address of the duplicate packets to the intercept server is 0.0.0.0.
This issue can cause problems when the intercept server sets up filters for the
incoming packets, which do not allow src address 0.0.0.0. However, the content of
the duplicated packet itself is correct.
Workaround: Disable the src IP address filter on the intercept server, or allow a
0.0.0.0 src IP address.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
325
Caveats for Cisco IOS Release 12.3 BC
Table 87
Resolved Caveats for Cisco IOS Release 12.3(9a)BC3 (continued)
DDTS ID Number
Description
CSCeg88558
In a 3-way call between A, B, C, where subscriber A is configured for CALEA
INTERCEPT, duplicated audio for streams A<->B and A<->C from the CMTS
have the same CCCid. Media_Reports do indicate different CCCids for the streams.
There are no known workarounds.
CSCeg89877
When loading Cisco IOS Release 12.3(9a)BC, including the additional fix for inter
card load balancing (CSCsa48673), negative values are displayed in the show load
balancing output.
Workaround: Clear the counters.
CSCeh05706
A Cisco uBR7200 series router unexpectedly reloads because of a bus error and
generates a syslog error message and tracebacks.
This issue occurs on a Cisco uBR7200 series router that functions as a cable
modem termination system (CMTS) with a large number of modems during a heavy
load.
There are no known workarounds.
CSCeh06084
A cable modem termination system (CMTS) running Cisco IOS
Release 12.3(9a)BC no longer returns the description “cable upstream X
description” when the following MIB object is polled:
ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifAlias
There are no known workarounds.
CSCeh45836
In a virtual private network (VPN), when Dynamic Host Configuration Protocol
(DHCP) leases of the order of 1-2 hours are used, the cable modem termination
system (CMTS) does not clean up stale duplicate IP addressees for customer
premises equipment (CPE).
This issue occurs on VPN CMTS networks with short lease times on the DHCP
server.
Workaround: Reset the cable modem that owns the stale duplicate CPE entry.
CSCsa40275
A configure command does not set no cache L3 disable.
This issue occurs when the L3 hiding place is enabled.
Workaround: To check that the CERF function is effective, enter the show memory
cache error-recovery command. The command should show:
L3 Data cache recovery is enabled
CSCsa48673
The show cable modem load-bal stat is 4294967295 (0xffffffff)
There are no known workarounds.
CSCsa48675
The unregistered modem count is too high in the show cable modem sum total
display.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
326
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 87
Resolved Caveats for Cisco IOS Release 12.3(9a)BC3 (continued)
DDTS ID Number
Description
CSCsa50341
The current configuration mode CLI comments for the ToS-overwrite feature of
DOCSIS1.0+ cable quality of service (QoS) profiles are outdated:
Router(config)# cable qos profile 100 tos-overwrite ?
<0x1-0xFF> TOS-overwrite mask byte in hex <-- ***Here***
and
Router(config)# cable qos profile 100 tos-overwrite 0x20 ?
<0x0-0xFF> TOS-overwrite value byte in hex <-- ***Here***
The current config mode options are: TOS-overwrite mask byte in hex and
TOS-overwrite value byte in hex.
These options should be changed to: TOS-overwrite-mask-and byte in hex and
TOS-overwrite-mask-or byte in hex to reflect the proper behavior of IOS.
There are no known workarounds.
CSCsa50360
The current implementation of cable service classes and cable quality of service
(QoS) profiles cannot guarantee a TOS setting of 0x0. This is due to a configuration
restriction of the TOS-overwrite-mask-and byte. This value can only be set within
0x1 and 0xFF. Without the option to configure 0x0, there is no way to guarantee a
TOS value of 0x0.
There are no known workarounds.
CSCsa64478
The following traceback output appears in the syslog when moving active modems
from one profile to a second profile that has quality of service (QoS):
ALIGN-3-SPURIOUS: Spurious memory access made at 0x6045488C reading 0x4
SLOT 3/0: Feb 18 10:57:59.945
%ALIGN-3-TRACE: -Traceback= 6045488C 60455368 60276608 605FCB7C
605F622C 605F63FC 00000000 00000000
-->
There are no known workarounds.
CSCsa65080
The STM counter overflows, and the show cable sub over command displays a
large traffic count where there is no traffic.
This issue occurs because the counters exceed those defined by the quality of
service (QoS) profile.
There are no known workarounds.
CSCef93215
A router that is configured for Open Shortest Path First (OSPF) reloads
unexpectedly and references the “ospf_build_one_paced_update” process.
This issue occurs on a Cisco router that has a mixture of Link-State Advertisements
(LSAs) (of type 5 and 11) that travel throughout an autonomous system and LSAs
(of any type other than type 5 and 11) that travel within a particular OSPF area. The
symptom can occur at any time without any specific changes or configuration and
is not specifically related to any type of LSA.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
327
Caveats for Cisco IOS Release 12.3 BC
Table 87
Resolved Caveats for Cisco IOS Release 12.3(9a)BC3 (continued)
DDTS ID Number
Description
CSCeh20178
This fix stabilizes periodic station maintenance scheduling. This fix is necessary
for cable domains with more then 2000 modems on a single downstream.
There are no known workarounds.
CSCsa53912
You cannot log on when a TACACS+ server is used for authentication. You get a
message that authentication fails and you are asked to enter your user name again.
This issue occurs when you make a Telnet connection to a router that is configured
for TACACS+ after you have entered your user name and your TACACS password.
Workaround: Configure the TACACS+ single connection option by entering the
tacacs-server host host-name single-connection command.
Open Caveats for Release 12.3(9a)BC2
This section documents possible unexpected behavior by the Cisco IOS 12.3(9a)BC2 release and
describes only severity 1 and 2 caveats and select severity 3 caveats.
There are no known open caveats for the Cisco IOS 12.3(9a)BC2 release.
Resolved Caveats for Release 12.3(9a)BC2
Table 88 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC2
release.
Table 88
Resolved Caveats for Cisco OS Release 12.3(9a)BC2
DDTS ID Number
Description
CSCeg77626
When a wiretapped Media Terminal Adapter (MTA) is on a bundle slave interface,
the src IP address of the duplicate packets to the intercept server is 0.0.0.0.
This issue can cause problems when the intercept server sets up filters for the
incoming packets, which do not allow src address 0.0.0.0. However, the content of
the duplicated packet itself is correct.
Workaround: Disable the src IP address filter on the intercept server, or allow a
0.0.0.0 src IP address.
CSCeg88558
In a 3-way call between A, B, C, where subscriber A is configured for CALEA
INTERCEPT, duplicated audio for streams A<->B and A<->C from the cable
modem termination system (CMTS) have the same CCCid. Media_Reports do
indicate different CCCids for the streams.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
328
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 88
Resolved Caveats for Cisco OS Release 12.3(9a)BC2 (continued)
DDTS ID Number
Description
CSCeh06084
A cable modem termination system (CMTS) running Cisco IOS
Release 12.3(9a)BC no longer returns the description “cable upstream X
description” when the following MIB object is polled:
ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifAlias
There are no known workarounds.
CSCeh20178
This fix stabilizes periodic station maintenance scheduling. This fix is necessary
for cable domains with more then 2000 modems on a single downstream.
There are no known workarounds.
Open Caveats for Release 12.3(9a)BC1
This section documents possible unexpected behavior by the Cisco IOS 12.3(9a)BC1 release and
describes only severity 1 and 2 caveats and select severity 3 caveats.
There are no known open caveats for the Cisco IOS 12.3(9a)BC1 release.
Resolved Caveats for Release 12.3(9a)BC1
Table 89 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC1
release.
Table 89
Resolved Caveats for Cisco IOS Release 12.3(9a)BC1
DDTS ID Number
Description
CSCef70739
A “MAXMEMORY USED Reached maximum amount of memory allocated for
stile” error is displayed at the console and the “Active links” for the show ip nbar
resources command shows 4 GB plus.
This issue occurs when the NBAR feature is activated (that is, when a match
protocol protocol-name command is included in a policy map), or the ip nbar
protocol-discovery command is applied on an interface.
Workaround: Enter a no ip nbar resources command to reset the active links back
to zero.
CSCef79717
The default fair-queue command changes the queueing strategy under cable
interfaces from the default of WFQ to FIFO.
This issue occurs on Cisco IOS Release 12.2(15)BC2c and earlier releases.
Workaround: Configure “fair-queue” under the cable interface to change the
queueing strategy from FIFO back to the default of FIFO.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
329
Caveats for Cisco IOS Release 12.3 BC
Table 89
Resolved Caveats for Cisco IOS Release 12.3(9a)BC1 (continued)
DDTS ID Number
Description
CSCef80943
Cisco IOS on the MC28U or MC520 cable line card unexpectedly reloads. The
stack in the crashinfo file contiguously lists 17 or more IP addresses in a secondary
address range configured for the chassis. The IP addresses are addresses of
customer premises equipment (CPE) behind a single modem.
The unexpected reload only occurs if Simple Network Management Protocol
(SNMP) queries that list or count CPE IP addresses are executed. There must be
more than 16 CPEs behind a cable modem to cause a stack overwrite. If there are
23 or more CPEs, the stack overwrite is severe enough to unexpectedly reload.
Workaround: Change the cable modem config file to allow a maximum of 16 CPEs
behind a modem.
Alternative Workaround: Stop all SNMP queries for CPE IP addresses. Stop
queries for the docsIfCmtsCmStatusEntry SNMP table.
CSCef86926
On an MC28U line card with advanced spectrum management, modulation change
does not occur when the carrier-to-noise ratio (CNR) is below the configured
thresholds.
There are no known workarounds.
CSCef97515
This fix adds a stack trace to the debug packetcable gate database command to
provide more information for debugging purposes.
The stack trace is activated using the debug packetcable subscriber verbose
command.
CSCeg01817
A Cisco uBR7246VXR router running Cisco IOS Release 12.2(15)BC2a crashes
due to memory corruption issues. The trigger is unknown.
There are no known workaround.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
330
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 89
Resolved Caveats for Cisco IOS Release 12.3(9a)BC1 (continued)
DDTS ID Number
Description
CSCeg11416
A cable-modem on a distributed line card displays as “not registered” on the
Network Processing Engine (NPE) but displays as “online” on the line card. A
sample router log is shown below. Both commands are run on the NPE; the first
command gets data from an NPE table, the second command gets data from the
distributed line card. When a cable modem (CM) enters this out-of-sync situation,
packets from the CM will be silently dropped by the cable modem termination
system (CMTS).
Router# show cable modem 0007.0e01.7d9d
MAC Address
IP Address
I/F
MAC
Prim RxPwr
Num BPI
State
Sid (dB)
CPE Enb
Cable modem with MAC address 0007.0e01.7d9d not registered.
Router# show cable modem | incl 0007.0e01.7d9d
MAC Address
IP Address
I/F
MAC
Num BPI
State
CPE Enb
0007.0e01.7d9d 192.168.0.1
C4/0/U0
online
0
N
Timing
Offset
Prim RxPwr
Timing
Sid
(dB)
Offset
0.00
5701
3
This issue occurs on a Cisco uBR7200 router running Cisco IOS Releases
12.3(9a)BC and 12.2(15)BC2c. The CMTS appears to be running normally for
about 1 week before the bug occurs.
Workaround: This problem is difficult to detect because no message is displayed on
the CMTS when the situation occurs. The only known workaround is to run a script
that scans the MAC addresses of CMs, and if the situation is detected, reset the CM.
CSCeg24134
The Simple Network Management Protocol (SNMP) agent in Cisco uBR7200
routers running Cisco IOS Release 12.2(15)BC2 and later won’t return values for
the MIB table, ipNetToMediaTable, even if there are no SNMP views configured.
Workaround: Cisco IOS Release 12.2(15)BC1 seems to work properly.
CSCeg27950
The FLAP-LIST is not aging properly in Cisco IOS Release 12.2(15)BC2c, it does
test properly with Cisco IOS Release 12.2(15)BC2b.
There are no known workarounds.
CSCeg32660
Extra Unsolicited Grant Services (UGS) grants are being sent by the cable modem
termination system (CMTS) scheduler. This causes robotized voice with certain
brands of embedded Media Terminal Adapters (MTAs).
This issue occurs on a Cisco uBR7246VXR router running Cisco IOS
Release 12.2(15)BC2a and 20ms interval voice traffic.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
331
Caveats for Cisco IOS Release 12.3 BC
Table 89
Resolved Caveats for Cisco IOS Release 12.3(9a)BC1 (continued)
DDTS ID Number
Description
CSCeg40945
The cable modem termination system (CMTS) database is not correctly updated
with the IP address of the customer premises equipment (CPE), and the following
message is generated for the CPE MAC address abcd.efgh.ijkl.mnop:
Failed to find CM with SID # 0, not to glean from this DHCP packet
DHCPGLEAN abcd.efgh.ijkl.mnop cmts glean failed
This issue occurs under the following conditions:
•
The Cisco uBR router is configured for Multiprotocol Label Switching
(MPLS) Virtual Private Network (VPN)
•
CPE requesting an IP address is on one cable subinterface x/0.n
•
Dynamic Host Configuration Protocol (DHCP) server is on another cable
subinterface y/0.p
•
Cable interfaces have to be different
There are no known workarounds.
CSCeg68008
Reverse Address Resolution Protocol (ARP) fails on the cable modem termination
system (CMTS) for Ethernet (WAN/LAN) interfaces.
This issue occurs on the CMTS during normal operation.
There are no known workarounds.
CSCsa44474
A Cisco uBR7200 router reloads due to a bus error.
There are no known workarounds.
CSCsa44591
A TACACS Transmission control Protocol (TCP) session between the router and
the ACS hangs with the single connection option.
This issue occurs on a Cisco uBR7200 router running Cisco IOS
Release 12.3(9a)BC.
Workaround: Remove the “single-connection” option from the TACACS+
configuration. When this issue occurs, turn off and turn on the “single connect”
option.
CSCsa44945
As many as 10% of cable modems do not come online after enabling downstream
load balancing across two downstreams on different MC28U line cards.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
332
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Open Caveats for Release 12.3(9a)BC
Table 90 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC
release.
Table 90
Open Caveats for Cisco IOS Release 12.3(9a)BC
DDTS ID Number
Description
CSCee80483
A Cisco uBR7246VXR router running Cisco IOS Release 12.2(15)BC2a
unexpectedly reloads due to watchdog timeout when a cable modem entry is
cleared as follows:
Router# clear cable modem X.X.X.X delete
UBR7200-3-BADARPDELETE: Tried to remove arp entry for X.X.X.X that is
not dynamicProcess aborted on watchdog timeout, process = DHCPD
Receive.
+++++++++
where
X.X.X.X
represents the IP address of the cable modem.
There are no known workarounds.
CSCef92997
A Cisco uBR7200VXR router unexpectedly reloads with a software forced reload
as follows:
Aug 10 13:58:27.692: %SYS-2-FREEFREE: Attempted to free unassigned
memory at 638BB58C, alloc 60945BC4, dealloc 60946A9C
Aug 10 13:58:27.696: %SYS-6-BLKINFO: Attempt to free a block that is in
use blk 638BB564, words 118, alloc 60945BC4, Free, dealloc 60946A9C,
rfcnt 0
Aug 10 13:58:27.728: %SYS-2-MALLOCFAIL: Memory allocation of 328 bytes
failed from 0x60914A58, alignment 0
Pool: Processor Free: 408351600 Cause: Mempool corrupt
Alternate Pool: None Free: 0 Cause: No Alternate pool
There are no known workarounds.
CSCef96146
Frequent log messages are generated about a problem with one of the fans:
%ENVM-3-BLOWER: Fan 1 may have failed
The fan appears to be working correctly with no cooling problem.
This issue occurs only on Cisco uBR7200 routers running a Cisco IOS
Release 12.2(15)BC2, such as 2a or 2b.
There are no known workarounds.
CSCef89495
A Cisco uBR7200 router running the Cisco IOS Release 12.2(15)BC2b
unexpectedly reloads with a bus error at address D0d0dxx, presumptively after
issuing a show controller cable x/y command.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
333
Caveats for Cisco IOS Release 12.3 BC
Table 90
Open Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCef67544
Upstream (US) rate shaping has a negative affect on per-modem US speeds when
exceeding typical speeds of 3 Mbps when using a 28U line card with Cisco IOS
Release 12.2(15)BC2c and special configurations to allow per-modem speeds on
the US exceeding 10 Mbps.
Workaround: Instead of using the default setting of cable upstream x
rate-limit-token-bucket shaping, drop the shaping keyword when offering rates
higher than ~5 Mbps or so.
CSCef79717
The default fair-queue command changes the queueing strategy under cable
interfaces from the default of WFQ to FIFO. This issue occurs on Cisco IOS
Release 12.2(15)BC2c and earlier releases.
Workaround: Configure “fair-queue” under the cable interface to change the
queueing strategy from FIFO back to the default of FIFO.
Resolved Caveats for Release 12.3(9a)BC
Table 91 lists only severity 1 and 2 caveats and select severity 3 caveats for the Cisco IOS 12.3(9a)BC
release.
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC
DDTS ID Number
Description
CSCea85575
There is currently no method to find out how long an online cable modem has been
online.
There are no known workarounds.
CSCeb42687
The following error message appears on the NPE-G1:
*May 30 09:13:05.618: %SYS-3-INTPRINT: Illegal printing attempt from
interrupt level.
-Process= “<interrupt level>”, ipl= 5
There are no known workarounds.
CSCeb43381
Incorrect values are returned for the ifInOctets IF-MIB object.
This issue occurs on a Cisco uBR7200 series router that is configured with a
Network Processing Engine G1 (NPE-G1) when the ifInOctets counter is polled via
Simple Network Management Protocol (SNMP) on a Gigabit Ethernet subinterface
that is configured for 802.1q encapsulation.
There are no known workarounds.
CSCeb72942
A Cisco 7301 router unexpectedly reloads during POS-OC3MM port adapter
online insertion and removal (OIR) with traffic running through on-board Gigabit
Ethernet interfaces.
Workaround: Stop the traffic, and initiate OIR.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
334
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCec27338
When packet streams contain packets that are fragmented it’s important that all the
fragments for a packet traverse the same router running Network Based Access
Recognition (NBAR). If some packets are dropped or routed around a particular
router running NBAR high CPU usage can occur as a result of the fragment table
getting too large when all fragments of a packet are not presented to NBAR.
There are no known workarounds.
CSCec65492
This issue occurs for both the cable interface and the Gigabit Ethernet interface.
One reason is that the moving average algorithm for bit rate takes byte count even
when it appears to be in error (negative). This may happen with other interface
types also.
There are no known workarounds.
CSCec85359
The following message appears:
snmpwalk failed OID.1.3.6.1.2.1.10.127.1.3.7
This issue occurs on a Cisco 7206VXR router running Cisco IOS
Release 12.1(13)EC3 with PA-A3-8E1IMA interfaces.
Workaround: Perform an online insertion and removal (OIR) of the line card.
CSCec86360
When the Unsolicited Grant Services with Activity Detection (UGS-AD) service is
in effect, the cable modem termination system (CMTS) is not sending the extra
UGS grant when switching from an inactive to an active period with incoming
frames where the QI (queue Indicator) is set ON.
There are no known workarounds.
CSCed06848
With Dynamic Shared Secret (DMIC) turned on, cable modems (CMs) are not be
able to download IOS configuration files.
This issue occurs if a cable modem (CM) is online and tries to download an IOS .cfg
file from the same Trivial File Transfer Protocol (TFTP) server as specified in the
Dynamic Host Configuration Protocol (DHCP) offer; the attempt fails. The issue
only happens with DMIC turned on, and on CMs (that is, Cisco CMs in routing
mode), that try downloading a second config file after coming online.
There are no known workarounds.
CSCed13018
Native Gigabit Ethernet interface throttling is always bypassed.
This issue occurs because with newer version of BCM chips the throttling is
bypassed, whereas for older versions throttling is still needed.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCed26241
A Cisco uBR7246VXR router modifies Dynamic Host Configuration Protocol
(DHCP) BootP requests running Cisco IOS Release 12.2(15)BC1.
Example:
Debugs
debug ip dhcp server packet & debug ip udp
With 12.1(13)EC4 (working)
Dec 11 12:53:49.819: UDP: rcvd src=0.0.0.0(68),
dst=255.255.255.255(67),length=308
Dec 11 12:53:49.819: BOOTP: opcode 1 on interface FastEthernet0/0.50,
0secs, 0 hops
Dec 11 12:53:49.819: DHCPD: setting giaddr to 192.168.0.1.
Dec 11 12:53:49.819: UDP: sent src=192.168.0.1(67),
dst=10.0.0.1(67),length=328
Dec 11 12:53:49.819: DHCPD: BOOTREQUEST from 0002.de15.3ed8 forwarded
to10.0.0.1.
Dec 11 12:53:50.091: UDP: rcvd src=10.0.0.1(67),
dst=192.168.0.1(67),length=308
Dec 11 12:53:50.091: DHCPD: forwarding BOOTREPLY to client
0002.de15.3ed8.
Dec 11 12:53:50.091: DHCPD: creating ARP entry
(10.0.0.1,0002.de15.3ed8).
Dec 11 12:53:50.091: DHCPD: unicasting BOOTREPLY to client
0002.de15.3ed8(10.0.0.1).
Dec 11 12:53:50.095: UDP: sent src=192.168.0.1(67),
dst=10.0.0.1(68),length=328
With 12.2(15)BC1 (not working)
.Dec 11 12:46:18.173: UDP: rcvd src=0.0.0.0(68),
dst=255.255.255.255(67),length=308
.Dec 11 12:46:18.173: BOOTP: opcode 1 on interface FastEthernet0/0.50,
0 secs, 0 hops
.Dec 11 12:46:18.173: DHCPD: setting giaddr to 192.168.0.1.
.Dec 11 12:46:18.173: DHCPD: adding relay information option.
.Dec 11 12:46:18.173: UDP: sent src=192.168.0.1(67),
dst=10.0.0.1(67),length=249
.Dec 11 12:46:18.173: DHCPD: BOOTREQUEST from 0002.de15.3ed8 forwarded
to 10.0.0.1.
This issue occurs after the Cisco uBR7246VXR router was upgraded to Cisco IOS
Release 12.2(15)BC1 from 12.1(13)EC4.
The packets are shortened and as a result, the DHCP server may drop the requests.
Workaround: Revert to Cisco IOS Release 12.1(13)EC4.
CSCed26897
Every frequency hop leads to an upstream re-init that causes a 300ms delay in
servicing Unsolicited Grant Services (UGS). The issue is made more severe
because frequency hopping on upstreams that have no modems on them is
happening too frequently, and as a result, is causing a lot of UGS interruption
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
336
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCed27848
A Cisco uBR router running Cisco IOS Releases 12.2(15)BC1 and 12.2(15)BC1a
has a problem with loading the startup-config after a reload of the Baseline Privacy
Interface Plus (BPI+) configuration and cable modems. When BPI+ is enabled in a
cable modem config file after reloading, the cable modem termination system
(CMTS) doesn't load the startup-config
This issue occurs on Cisco IOS Releases 12.2(15)BC1 and 12.2(15)BC1.
There are no know workarounds.
CSCed28844
When a gate transits to the “committed” state, then back to “reserved”, and then to
“committed” again, a new gate-open message is sent again, which is not desired.
There are no known workarounds.
CSCed29514
A Cisco 7200 series NPE-G1 built-in GE (SBeth) MAC filter may accept NULL
destination addresses (DAs) (00-00-00-00-00-00). This unintentional behavior may
pose a denial of service security risk in customer environments when their networks
are flooded with NULL DAs.
This issue occurs when NULL DAs are presented to an NPE-G1 Gigabit Ethernet
interface. This situation may be either a third-party vendor product flaw or a
third-party vendor documentation error. (The third-party vendor documentation
states that NULL DAs may be used for unused MAC filter entries, implying that
they are not accepted.)
There are no known workarounds.
CSCed36625
On cable routers, including Cisco uBR7200 routers, customer premises equipment
(CPE) operating systems (OSs) such as Linux and FreeBSD appear to frequently
change the MAC address of their gateway IP address. For example, Linux shows:
Dec 15 00:12:17 home /kernel: arp: 192.168.0.1 moved from
00:01:42:1d:4d:54 to 00:01:42:1d:4d:a8 on dc0
Dec 15 00:13:26 home /kernel: arp: 192.168.0.1 moved from
00:01:42:1d:4d:a8 to 00:01:42:1d:4d:54 on dc0
Dec 15 00:26:17 home /kernel: arp: 192.168.0.1 moved from
00:01:42:1d:4d:54 to 00:01:42:1d:4d:a8 on dc0
FreeBSD will show:
arp: 10.0.0.1 moved from 00:08:e2:33:0c:54 to 00:08:e2:33:0c:70 on ed0
arp: 10.0.0.1 moved from 00:08:e2:33:0c:70 to 00:08:e2:33:0c:54 on ed0
This issue occurs when cable bundling is configured. Modems and CPEs on the
bundle slave interface(s) experience the problem. Devices on the master interface
do not experience the problem.
The issue is caused because the L2 header for the Address Resolution Protocol
(ARP) replies and the ARP requests are not consistent on a bundle slave. An ARP
reply will have a source MAC in the L2 header of the bundle slave interface. A
broadcast ARP request will have a source MAC of the bundle master and the ARP
request packets will have a MAC source of the bundle master.
Workaround: In theory, using a static ARP entry on the CPE device binding the
gateway IP address to the MAC address of the cable modem termination system
(CMTS) slave interface will prevent the CPE from changing its ARP entry for the
gateway.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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337
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCed53355
When overlapping IP address ranges are configured for customer premises
equipment (CPE) in separate virtual private networks (VPNs) in a Multiprotocol
Label Switching (MPLS)/VPN configuration, the host DB on the Network
Processing Engine (NPE) does not match the host DB on the CLC for at least one
CPE that has an IP address that duplicated another CPE on the same CLC.
This issue may cause problems with source-verify and max-host.
Workaround: Use unique IP addresses for each cable interface or subinterface.
CSCed56281
Although a PPP over Ethernet (PPPoE) client is connected behind a cable modem
(CM), it is not displayed in the output of the show interface cable x/x modem
[SID] command.
This issue occurs only on the MC16U and/or MC28U line card. The MC16C and/or
MC28C line cards do not have this defect.
This issue has no effect on communications with the PPPoE client. This issue is a
cosmetic problem.
A mistake was made in this fix that has been corrected by the fix for CSCed75131.
Be sure to apply that fix as well when applying this fix.
There are no known workarounds.
CSCed61110
A Cisco uBR7200 series cable modem termination system (CMTS) running
Cisco IOS Release 12.2(15)BC1 experiences a software-forced reload after a
watchdog timeout in the CMTS MAC timer process.
The failure occurs on a platform with NPE-G1.
There are no known workarounds.
CSCed61686
Time-of-day (ToD) packets are not being routed correctly by the local ToD server
when a Multiprotocol Label Switching (MPLS)/Virtual Private Network (VPN) is
configured.
This fix allows the local ToD server to be configured with MPLS/VPN.
There are no known workarounds.
CSCed63206
The line cards reload.
This issue occurs as a result of an ipc-timeout because of buffer depletion.
There are no known workarounds.
CSCed64701
Unexpected packet loss at a certain rate and frame size, and overrun incrementing
on the interface occurs on the Gigabit Ethernet Interfaces.
There are no known workarounds.
CSCed65148
A Cisco uBR7200 router experiences a reload. The following cause appears in the
show version command:
System returned to ROM by break at PC 0x607C35F0
There are no known workarounds.
CSCed65223
The ifHCOutOctets counters are impossibly high for Gigabit Ethernet interfaces.
The ifHCInOctets counters seem to be correct.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
338
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCed67484
CSCed14039 fixed a WDT problem for the NPE-G1. A first set of diffs were ported
from this DDTS to the Cable BC release train in Nov., 2003. Later another set of
diffs were committed to the same DDTS that fixes the problem at more of a root
cause level.
This DDTS was opened to port the 2nd commit against CSCec14039 to the Cable
BU branches.
As of commit of this DDTS to Cable BU branches, NPE-150 support will break.
Cisco has let this NPE-G1 commit moved forward; NPE-150 is no longer
supported.
There are no known workarounds.
CSCed68043
Address Resolution Protocol (ARP) filter counters do not clear. The
Cisco uBR7246 platforms are affected.
ARP filters are enabled and there is ARP traffic that is being filtered.
There are no known workarounds.
CSCed73075
An NPE-400 unexpectedly reloads. The reload was identified to be missing
CSCec58486 in the Cable BU BC train. This DDTS has been created to port
CSCec58486 to Cisco IOS Releases 12.2(15)BC2 and 12.2(15)BC1c.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
339
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCed77196
The Cisco BR7200 router does not enforce MAX-CPE on a cable modem
termination system (CMTS) interface when it's configured as a member of a bridge
group because the method used to glean host information relies on Address
Resolution Protocol (ARP) and Dynamic Host Configuration Protocol (DHCP)
packets may not be available to the CMTS code. As a result, if the CMTS bridging
code cannot find a customer premises equipment (CPE) service identifier (SID) in
the host table, it will apply a default quality of service (QoS) setting, which may
provide a greater than expected downstream bitrate.
This change does the following:
•
Stores the primary upstream SID for each CPE on the CMTS interface in the
bridging table and passes the SID value to the CMTS bridging code when
packets are bridged in a downstream direction.
•
Gleans information from upstream packets and adds the MAC address and SID
information to the CMTS host tables. Note: It will not glean IP addresses.
•
Enforces the MAX-CPE setting on downstream packets.
The following text was taken from the Release-note enclosure for CSCec86611:
A Cisco uBR7200 router running Cisco IOS Release 12.1(13)EC3 is configured in
bridge mode. For the test Only 1 CM is connected with downstream (DS) rate
limited to 1 Mbps and with Max-cpe to 1 (without Baseline Privacy Interface (BPI))
Initial test with one PC behind the CM is ok (big download limited in DS to 1
Mbps).
If now we swap the PC with a new one (new IP address) and reset the CM, the user
is able to get up to 7 Mbps for the same download.
The problem is the following:
The CMTS logs the MAX-cpe errors when seeing the upstream (US) traffic (as the
CMTS still has the old PC in its database) but ARP table and bridge table are still
polled. So the CMTS is bridging the traffic for this new PC to cable interface even
if it is not associated to any SIDs.
Workaround: CMTS: clear cable host old_host ---> so now the new PC is
associated to the SID of the CM.
CMTS: increase the MAX-CPE to allow the new PC to be associated to the cable
modem (CM) and let the old one get removed by timeout.
CMTS: use BPI to encrypted dedicated traffic to that CM.
CMTS: remove bridging setup.
CSCed78236
The SNMP GetBulk of docsQosMIBObjects.1 causes a CPUHOG error message.
There are no known workarounds.
CSCed78829
Performance degradation occurs when the NRNG_CR_ACF and NRNG_CR_TCF
registers are changed because of incorrect consideration for performance
optimization.
This issue affects only Quadrature Amplitude Modulation 16 (QAM16)
modulation.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
340
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCed83867A
When cable source-verify dhcp is enabled on a Cisco uBR7246VXR router with
NPE-1G and MC28U blades, the following occurs:
1.
100% CPU load and flooding of the Cisco Network Registrar (CNR) with
service queries; the contributor to the high CPU load is identified to be the
'DHCPD Receive' process.
2.
The few MAC addresses displayed in the Address Resolution Protocol (ARP)
entry show all zeros.
Workaround: Turn off the cable source-verify dhcp option in the config to bring
the CPU load back down.
CSCed86260
Although two cable interface are bundled, the ifInUcastPkts of the secondary cable
interface is decreasing.
There are no known workarounds.
CSCed86429
The test cable dsc qos command does not work for downstream (DS) service flows.
Workaround: Use the test cable dsc message command.
CSCed88709
When a service-policy that corresponds to a policy-map with no fair-queueing
classes is applied outbound on a cable interface and one class performs shaping, the
Cisco uBR7200 router drops outbound packets and generates error messages
similar to the following:
%LINK-4-BADQID: Interface Cable4/0, bad output queue ID specified
(265).
The packet drops occur when the shaping classes become active because of traffic
rates that exceed the prescribed limits in the class.
Workaround: Have at least one class with a fair-queueing configuration in the
policy-map by using one of the “bandwidth”, “priority”, or “fair-queue” commands
within the policy-map for at least one class.
CSCed89735
An uncorrectable Expanded Call Context (ECC) parity error occurs on a
Cisco 7200 series router that is configured with an NPE-G1.
This issue occurs rarely when you enter the show sysctlr or the show tech
command on the NPE-G1.
Workaround: Do not enter the show sysctlr or the show tech command.
CSCed89815
A bus error occurs on a Cisco router when you enter a trace command, for example,
the trace www.a.net command. When you enter the show version EXEC
command, the following error messages may be displayed:
System returned to ROM by bus error at PC 0xXXXXXXXX, address
0xYYYYYYYY
0xXXXXXXXX represents the program counter at which the router reloads;
0xYYYYYYYY represents the address at which the router reloads.
This issue occurs on a Cisco router that runs Cisco IOS Release 12.2(15)BC1 but
can also occur in Cisco IOS Release 12.3 or 12.3 T.
For more information on bus errors, refer to the following URL:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09
186a00800cdd51.shtml
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
341
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCed91527
The Request Collision counter does not appear to be incrementing on the MC8u
card, when using the show controller command.
There are no known workarounds.
CSCed95046
Source verify is not performed for MC28U interfaces on a Cisco uBR7200 router.
There are no known workarounds.
CSCed95436
The Total-Kbyte value is too high when the show subscriber-usage command is
issued on a Cisco uBR7246VXR router.
This issue occurs on Cisco IOS Releases 12.2(15)BC1 and 12.2(15)BC1b.
Example:
Router# show cable subscriber-usage over-consume
Sfid Mac Address
Enforce-rule Total-Kbyte Last-detect
Last-penalty
Pen
Name
Count
time
time
Flag
761 0000.0000.0002 RESA1-UP
4294967087 Mar10 21:55:01 Mar10
22:55:01 Act
762 0000.0000.0002 RESA1-DOWN 4294967270 Mar10 21:55:01 Mar10
22:55:01 Act
Router# show cable modem 0000.0000.0002 counters
MAC Address
US Packets
US Bytes
DS Packets
DS Bytes
0000.0000.0002 1631
219278
1467
1187222
cable qos enforce-rule RESA1-UP
penalty-period 60
registered qos-profile 92
enforced qos-profile 12
monitoring-duration 120
activate-rule at-byte-count 38400 upstream enforce
enabled
cable qos enforce-rule RESA1-DOWN
penalty-period 60
registered qos-profile 92
enforced qos-profile 12
monitoring-duration 120
activate-rule at-byte-count 450000 downstream enforce
enabled
cable qos profile 12 max-burst 1544
cable qos profile 12 max-downstream 575
cable qos profile 12 max-upstream 128
cable qos profile 92 max-burst 1544
cable qos profile 92 max-downstream 1600
cable qos profile 92 max-upstream 128
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
342
OL-6763-49
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCee00703
Because the connection info object contains only the server IP and the src port, the
client fails to map to a specific session as the server src port changes. As a result,
the COPS message cannot be sent to the proper session.
This issue occurs after any TCP reset due to link loss when the interface is shut or
after a HA switchover when the new connection is established.
This feature is also needed for configurations with multiple connections per each
subnet to a single server, such as cable network’s PacketCable voice deployment,
or HA configurations.
There are no known workarounds.
CSCee00790
Under certain conditions, the admission of periodic events (ugs/ugsad/nrtps/rtps)
can lead to a crash. This issue only occurs when the channel rate is 160ks/s (not a
common channel rate).
Workaround: Do not configure the channel for 160ks/s in production networks.
CSCee06228
The SRP protocol on a Cisco uBR7246VXR router does not fully initialize during
the boot sequence.
This issue occurs on a Cisco uBR7246VXR router running Cisco IOS
Release 12.2(15)BC1b when one SRP side is wrapped.
Workaround: Force a wrap by entering the srp ips request forced-switch
command, and then remove this forced wrap. Note that you have to do this
manually after a reload/reboot.
CSCee11283
The default “continue ranging” value in cable modem termination system (CMTS)
software to date is 1 dB. This value is an arbitrary value in the software and does
not reflect Cisco RF Engineering best practices recommendation of a window of
3-6.
The 1 dB window can unnecessarily cause cable modems to attempt to repeatedly
come online and then fall offline causing customers to have intermittent network
connectivity.
Workaround: Change the command on the CMTS to open the window by hand:
cable up X power-adjust continue 4
CSCee12282
A Cisco uBR7246VXR cable modem termination system (CMTS) router with
output QMC traffic-shaping enabled and active on a cable interface can leak
processor pool memory under high load, for example, when multiple particles are
used for packet buffering.
Workaround: Remove the output QMC shaping command from the cable interface
to stop the leak; reload the router to reclaim memory.
CSCee12868
The docsIfCmtsCmStatusSignalNoise counter returns the wrong value. It returns
tenths of dBs, rather than dBs.
Workaround: Multiply the received number by 10.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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343
Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCee16342
The cable modem termination system (CMTS) reloads unexpectedly when the show
packetcable gate gateid command is issued:
The unexpected reload occurs if the command is issued during the time duration
when that particular gate is being deleted (for example, as a result of call teardown).
There are no known workarounds.,
CSCee17648
The MAC Scheduler incorrectly calculates max-unfrag-sz resulting in packet loss.
Workaround: Modify the modulation profile so the ma -burst option matches that
of max-unfrag-sz.
CSCee20869
To protect from DOS service attacks on the cable modem termination system
(CMTS), per SID basis throttling of lease queries and global rate limit for lease
queries initiated by downstream traffic has been added. This functionality is meant
to reduce the CPU utilization of Dynamic Host Configuration Protocol (DHCP)
Receive process and ISR context when cable source-verify dhcp and no cable arp
is configured.
There are no known workarounds.
CSCee21114
When source-verify dhcp and no cable arp is configured, the Dynamic Host
Configuration Protocol (DHCP) lease query response for the dst address of pkts
coming from the back-haul is dropped.
The customer premises equipment (CPE) is unreachable from the back-haul until
the CPE itself sends an Address Resolution Protocol (ARP) or IP packet.
Workaround: Do not configure no cable arp.
CSCee23838
If a downstream packet received at the cable modem termination system (CMTS)
is destined for a modem whose Address Resolution Protocol (ARP) entry is
incomplete or not present in the CMTS ARP database, the CMTS goes into a loop
of issuing out Dynamic Host Configuration Protocol (DHCP) lease queries and
receiving ACKs until an upstream packet for the modem populates the ARP
database on the CMTS.
Workaround: Disable no cable arp on the cable interface.
CSCee26361
A DHCPACK or DHCPNACK with a chaddr == 0 is not forwarded by the
Cisco Dynamic Host Configuration Protocol (DHCP) stack to the cable modem
termination system (CMTS) code when the CMTS is a relay agent.
The DHCP stack must forward such a reply to the CMTS code so that the CMTS
can make a decision on an active or inactive lease on the DHCP server.
There are no known workarounds.
CSCee27443
A second service flow cannot be created if DOCSIS 1.0+ vendor specific encodings
are used for data transfer.
This is a regression issue, which was triggered by CSCeb21271 and CSCdz66185.
Workaround: For any ToS value except 5, the second downstream (DS) flow will
be created, but bandwidth will end up being reserved for those flows.
CSCee27994
The default ranging-backoff value should be changed from “auto” to values of 3 6.
Workaround: Hard code the ranging-backoff values to 3 6.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCee29081
The cable modem termination system (CMTS) does not receive the Dynamic Host
Configuration Protocol (DHCP) response to a DHCP lease query even though the
response was sent from the DHCP server.
CSCee26361 fixed this problem. This DDTS is now adds a check in the CMTS code
to not continue with DHCP gleaning if a response to a lease query is received by
the CMTS.
There are no known workarounds.
CSCee32609
The cable modem termination system (CMTS) reports a CPU hog error when
processing GetBulk SNMP requests.
There are no known workarounds.
CSCee37649
Under high load with Baseline Privacy Interface (BPI) active, the Cisco uBR7200
router may lock up, permitting no console access. Higher level protocols will be
unresponsive (for example, the system will not respond to ARP requests). The
system may still forward packets.
Workaround: Take off the load for a period of time (physically disconnect all
connected modems) until the system recovers.
Alternative workaround: Disable BPI on systems with constantly high CPU load.
CSCee46169
Old hosts are getting aged out of the Address Resolution Protocol (ARP) table, but
the same hosts are not getting aged out of the service identifier (SID) table as shown
in a show interface cable 1/0 modem command. Since the modem never gets aged
out of the SID table, max CPE is eventually reached. The next CPE that tries to
register behind that modem is not permitted. A duplicate IP error message is
inserted into the log.
This issue exists only in ridge mode. To allow a subsequent cable modem onto that
cable modem termination system (CMTS), a bad host must be removed from the
SID table with a clear cable host command or the cable modem must be power
cycled.
There are no known workarounds.
CSCee46490
Users and internal tech support have a need to monitor the status and collect debug
information from the RF cards with on-board processors (for example, MC520 and
MC28U). This monitoring is currently achieved by using telnet or if-con to login
to the line card and issuing show commands to collect the data. Logging into the
line card should only be done under the direction of a Cisco support person. New
options to the existing show controllers command will be added to collect line card
data from the Network Processing Engine (NPE).
Workaround: Telnet or if-con to the line card.
CSCee47911
The number of errors reported in the show interface cable x/y upstream z
command has increased dramatically after upgrading to Cisco IOS
Release 12.2(15)BC2a.
This issue appears on the MC28C, but does not appear to be affecting packet loss.
There are no known workarounds.
CSCee49594
The ENTITY-MIB does not recognize the NPE-G1 processor.
There are no known workarounds.
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Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCee52217
The output for debug cable l2-vpn conditional is a bit cryptic because the
corresponding service identifier (SID) number is displayed in hexadecimal.
This DDTS is to request the SID number be displayed in decimal format to improve
usability.
There are no known workarounds.
CSCee53014
A router reports the following error message when writing crashinfo:
07:15:05: %SYS-3-INVMEMINT: Invalid memory action (malloc) at interrupt
level
There are no known workarounds.
CSCee55444
Modems that get an IP address which is not the same subnet as the primary IP
address of the cable interface can get stuck in init(o).
See CSCed06821 for the modem security details that prevent modems from coming
online and getting stuck in init(o).
Workaround: Use the ip source-interface loopback 0 command.
CSCee55916
Users can logon to RF line cards with onboard processors without having “service
internal” configured on the Network Processing Engine (NPE) /Performance
Routing Engine (PRE) by executing the telnet command.
There are no known workarounds.
CSCee55989
When SNMP query getnext/getbulk DOCS-QOS-MIB:
docsQosCmtsMacToSrvFlowTable (docsQosCmtsIfIndex) is used, the network
management system (NMS) reports an infinite loop if the number of CMs is greater
than 1000.
All platforms are affected.
Workaround: Use the CLI to get the information. If only docsQosCmtsIfIndex is
needed, use cable modem mac address, snmp get exact cdxCmCpeIfIndex,
which is the same value as docsQosCmtsIfIndex.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCee61429
The MC28u, MC28x, MC16u, and MC16x real time clock drifts from the Network
Processing Engine (NPE) clock.
Due to a code omission in Cisco IOS Release 12.2(15)CX, 12.2(15)BC1a-e, and
12.2(15)BC2a-d, the real time clock on the MC28u, MC28x, MC16u, and MC16x
cable line cards for the Cisco uBR7246VXR router are not kept in sync with the
real time clock on the NPE. The estimated drift is approximately +/- 1.3 minutes
per month, and is somewhat temperature sensitive.
The line card clock is updated each time the system is reloaded, but not afterwards.
The line card clock is not updated even if Network Time Protocol (NTP) is
configured on the NPE.
The drift can cause a problem where modems will eventually be in the reject(ts)
state if the modem config file is set to contain a timestamp (see CSCef71411) and
the drift is greater than 30 seconds.
Workaround: If possible, write a script to periodically extract the current time from
the NPE, login to the line card using if-con/if-quit, and set the time to the NPE
value.
Alternative workaround 1: Reload during a service window.
Alternative workaround 2: Turn off timestamp.
CSCee64115
Dynamic load balancing across interfaces does not work for the last upstream
channel of an interface.
This issue occurs predominantly when an interface is added to a load balancing
group after the system was booted, and after modems are already online on the
system.
Workarounds: On an interface supporting Virtual Interfaces, configure an
additional upstream channel, but do not use it.
If Virtual Interfaces are not supported, ensure that the last upstream (US) channel
on an interface participating in load balancing is a member of a load balancing
group with at least two US channels on the affected interface.
If that is not applicable to your system, rely on static load balancing.
CSCee66672
High CPU usage occurs during an online insertion and removal (OIR) of the cable
line card if the cable modem (CM) onoff trap is enabled and throttled.
Workaround: Disable the CM onoff trap before OIR:
no cable enable-trap cmonoff-notification
CSCee67459
Payload header suppression fails with an immediate answer and auto commit
functionality on the cable modem termination system (CMTS). This results in calls
to a voice mail server failing, as the CMTS incorrectly processes the Dynamic
Service Change (DSC) messages.
There are no known workarounds.
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Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCee68920
If running static map advance when using the BC2a code, run the show controller
cx/y uz command to verify that using the map-advance static default settings in
BC2 code yields:
Router# show controller c3/0 u0
Map Advance (Dynamic) : 5480 usecs or higher.
This value is extremely high.
If the user changes the map-advance from the default of dynamic to static, this bug
will add an extra 2000 use of time to the calculation. Because this command is per
downstream (DS), this could affect upstream throughput for all users on all
upstream ports from the same DS port.
Workaround: Using the cab map-advance static 100 command will make the
calculation more reasonable, but it will display !1024 for all the affected modems
in the show cable mode command.
CSCee69887
A dual SRP ring fails to become active completely due to an is-type mismatch. The
output of the show clns neighbors command indicates that a certain system
interface remains in the Init state indefinitely, although the output of the show ip
interface brief command shows that this interface is up.
This issue occurs when a dual SRP ring is configured on three routers that run
Cisco IOS Release 12.2 S.
There are no known workarounds.
CSCee70014
Interface load balancing may fail to balance the load under the following
circumstances:
1.
The highest load upstream channel on the originating interface is associated
with a load balancing group. This load balancing group is not configured on
the target interface. This issue can be avoided by making sure that load
balancing group configurations match on all upstream (US) channels across
load balanced interfaces.
2.
The load on the US channel(s) associated with the load balancing group on the
target interface has a higher load than the US channel on the originating
interface. This issue is not usually a problem and/or is assumed to have only
minor operational impact.
There are no known workarounds.
CSCee76342
When running a PacketCable call, without setting the secondary Record Keeping
Server (RKS) IP address in Event-Generation-Info object in Gate-Set message, the
cable modem termination system (CMTS) unexpectedly reloads.
Workaround: Set the secondary RKS IP address in Event-Generation-Info object 9;
the address can even be a fake one).
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCee81149
With Cisco IOS Release 12.2(15)CX it is possible to configure 125 KHz steps.
With Cisco IOS Release 12.2(15)BC2a it is not possible to configure 125 KHz
steps.
This issue occurs because a change was made to the minimum frequency step size
since the original release of MC28u in Cisco IOS Release 12.2(15)CX.
This change was made to support alternate suppliers of upconverter modules. This
change restricts the step size to 250 Khz increments.
As a result, 168.125 Mhz is not accepted by Cisco IOS Release 12.2(15)BC2a
software.
There are no known workarounds.
CSCee91789
Payload header suppression (PHS) causes voice quality to significantly deteriorate.
This issue only impacts Transam on the Cisco VXR router. Legacy line cards are
not affected.
Workaround: Either disable downstream rate limiting, or configure max sustain rate
and min reserved rate to PHS-off rates.
CSCef04492
The snmpwalk on cdrqCmtsCmStatusTable does not show consistent results.
There are no known workarounds.
CSCef08652
The cable rate-limit-algorithim queue-per-cir command does not allow
communication to the MC28U card.
Workaround: Configure the value directly on the line card.
CSCef09586
If a Dynamic Host Configuration Protocol (DHCP) server in one of the configured
VRF’s has an IP address that matches the broadcast address of the IP subnetwork
used in another VRF (on another subinterface), cable modems do not come on-line
and stay in init(d).
This issue occurs on Cisco IOS Releases 12.2(11)BC2 and 12.2(15)BC1d.
Workaround: Change the IP address of the DHCP server, or change the IP address
scope in another VRF.
CSCef09770
Each flow appears in a different time with a different service identifier (SID) in the
docsIfCmtsServiceTable. However, the docsIfCmtsServiceCreateTime values are
the same for all SIDs.
There are no known workarounds.
CSCef19398
Momentarily (about 1 second) of ping packet loss occurs when changing the
downstream modulation rate on another cable interface on the same line card.
After the downstream (DS) cable interface is re-initialized, the ping operation
returns to normal (successful reception of ping packets).
There are no known workarounds.
CSCef20890
A Cisco uBR7246VXR router running Cisco IOS Release 12.2(15)BC1 reloads
unexpectedly due to a bus error.
There are no known workarounds.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Caveats for Cisco IOS Release 12.3 BC
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCef21709
Under rare and unusual conditions, the cable modem termination system (CMTS)
unexpectedly reloads when heavily loaded with voice and data traffic. There is no
way to predict or detect when this reload is about to happen.
There are no known workarounds.
CSCef22962
If Baseline Privacy Interface (BPI) is enabled, DSX messages with key sequence
number 0 are rejected.
Workaround: Wait until the key sequence number changes and retry the command.
CSCef27859
This code improves the modem bring up performance for the cable modem
termination system (CMTS).
There are no known workarounds.
CSCef29003
IOS Common Open Policy Service Protocol (COPS) clients do not interoperate
with some COPS servers.
If the COPS server sends to IOS a COPS message containing an Error Object with
an Error-Code in the range 12-15, IOS will reject the message. This violates RFC
2748 (see section 2.2.8). There are no known COPS applications at this time that
are known to fail due to this issue, but it could affect future (versions of) COPS
applications.
There are no known workarounds.
CSCef30671
If Baseline Privacy Interface (BPI) is active on multiple service flows on a modem,
key activation may fail on secondary service flows.
This issue occurs if the modem requests traffic encryption keys (TEKs) using
transmit opportunity associated with secondary service identifiers (SIDs).
There are no known workarounds.
CSCef31956
This fix improves Reverse Address Resolution Protocol (ARP) lookup on the cable
modem termination system (CMTS) for modem bring up.
There are no known workarounds.
CSCef37495
The Sync Pulse failure detection mechanism is not working for N+1/7200 solution.
Workaround: Use Fast Failure Detection for crash detection.
CSCef46191
A specifically crafted Transmission Control Protocol (TCP) connection to a telnet
or reverse telnet port of a Cisco device running Internetwork Operating System
(IOS) may block further telnet, reverse telnet, Remote Shell (RSH), Secure Shell
(SSH), and in some cases Hypertext Transport Protocol (HTTP) access to the Cisco
device. Telnet, reverse telnet, RSH and SSH sessions established prior to
exploitation are not affected.
All other device services will operate normally. Services such as packet
forwarding, routing protocols and all other communication to and through the
device are not affected.
Cisco will make free software available to address this vulnerability.
Workarounds, identified below, are available that protect against this vulnerability.
The Advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtml
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Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCef54205
When a Media Terminal Adapter (MTA) has multiple lines and both the lines are
being used to make calls, call failures occur in the following scenarios.
Scenario 1:
Line 1 has a call in progress, meanwhile, Line 2 makes a new call, then hangs up,
and makes another new call, then hangs up, and so on. After some time, Line 2 will
not be able to make a call.
Scenario 2:
Line 1 is having a call, Line 2 makes a new call. Before Line 2 hangs up, Line 1
hangs up and makes another call. Same for Line 2, it hangs up and makes another
call _before_ Line 1 hangs up, and vice versa. After some time, Line 1 and Line 2
will not be able to make new calls.
The problem happens because the activity count on the cable modem termination
system (CMTS) does not get decremented in each of the above scenarios (even if
the call on a line goes away). As a result the activity count reaches its limit and new
calls are not allowed.
However, at any instance, if both lines are disconnected, the activity count will be
reset again.
Workaround: Increase the activity count on BTS to a large number. This way, even
if the activity counts are not decremented at call termination, new calls will be
allowed until the activity count is maxed out. When both the lines are terminated,
the count will be reset automatically.
In the case where the MTA contains 2 lines only, it should not have a big impact
because it won't use up a lot of resources even if someone is trying to abuse the
system by making multiple calls simultaneously. Moreover, it is a counter issue
only, all the actual resources, such as service-flows, gates, are all freed up.
CSCef59093
A Cisco uBR-MC28U cable interface line card crashes in a Cisco uBR7200 series
cable modem termination system (CMTS) running Cisco IOS
Release 12.2(15)BC2b.
The issue only occurs with the MC28U line card; the MC16C line card in the same
chassis works correctly.
There are no known workarounds.
CSCef73242
A Cisco uBR7200 series cable modem termination system (CMTS) running
Cisco IOS Release 12.2(15)BC2b may not guarantee configured quality of service
(QoS) levels on downstream dynamic service flows in Voice over IP (VoIP)
networks.
The issue occurs with very high Service Flow Identifiers (SFIDs) (between 32768
and 65535) and when cable modems are provisioned with non-zero active QoS
timeout.
Workaround: Increase the bandwidth for Best Effort (BE) flow.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Related Documentation
Table 91
Resolved Caveats for Cisco IOS Release 12.3(9a)BC (continued)
DDTS ID Number
Description
CSCef74063
A router crashes with the error condition that the gate is freed on the Route
Processor (RP), but not the line card, prior to the resource being allocated through
the DSA-REQ from the Embedded Media Terminal Adapter (eMTA).
This issue occurs because a Gate lookup failure on the RP causes illegal access to
a stale gate entry pointer, and crashes the RP.
This issue does not affect release trains prior to Cisco IOS Release 12.3(9)BC.
There are no known workarounds.
CSCef86784
Enabling DOCSIS traps using the snmp-server enable traps docsis-cmts
command results in a traceback.
There are no known workarounds.
CSCin21618
A Cisco uBR7246VXR router with an OC-12 SRP interface crashes with the
following sequence of commands:
test
test
test
test
pas
pas
pas
pas
oir
oir
oir
oir
2
2
1
1
pull
push
pull
push
Workaround: Do not use the test pas oir command for the high slot of a double
wide card. You can enter the test pas oir 1 pull command followed by a push
repeatedly without error.
CSCin71529
When the cable quality of service (QoS) permission for the modems is disabled, the
QoS profile created by the modem may not be removed from the QoS profile table.
In addition, if a cable interface is shutdown or if a clear cable modem cax/y/z all
delete command is issued on the cable modem termination system (CMTS), the
QoS profile feature gets broken for deletion of QoS profiles - the profile should be
deleted, but it is not, because the internal reference count of the profile is corrupted.
There are no known workarounds.
Related Documentation
The following sections describe the documentation available for the Cisco uBR7200. These documents
consist of hardware and software installation guides, Cisco IOS configuration guides and command
references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules,
which are available online on Cisco.com and the Documentation CD-ROM.
Use these release notes with these documents:
•
Release-Specific Documents, page 355
•
Platform-Specific Documents, page 355
•
Feature Modules, page 356
•
Cisco Feature Navigator, page 356
•
Cisco IOS Software Documentation Set, page 357
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Release-Specific Documents
The following documents are specific to Cisco IOS Release 12.3 and are located on Cisco.com and the
Documentation CD-ROM:
•
Cross-Platform Release Notes for Cisco IOS Release 12.3
On Cisco.com at:
Technical Documents: Cisco IOS Software: Cisco IOS Release 12.3: Release Notes: Cisco IOS
Release 12.3
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.3:
Release Notes: Cisco IOS Release 12.3
•
Product bulletins, field notices, and other release-specific documents on Cisco.com at:
Technical Documents
•
Caveats for Cisco IOS Release 12.3 and Caveats for Cisco IOS Release 12.3 T
As a supplement to the caveats listed in “Caveats for Cisco IOS Release 12.3 BC” in these release
notes, see Caveats for Cisco IOS Release 12.3 and Caveats for Cisco IOS Release 12.3 T, which
contains caveats applicable to all platforms for all maintenance releases of Cisco IOS Release 12.3
and Cisco IOS Release 12.3 T.
On Cisco.com at:
Technical Documents: Cisco IOS Software: Cisco IOS Release 12.3: Release Notes: Caveats
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.3:
Caveats
Note
If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any
severity for any release. To reach Bug Navigator II, log in to Cisco.com and click Service
& Support: Technical Assistance Center: Select & Download Software: Jump to a
software resource: Software Bug Toolkit/Bug Watcher. Another option is to go to
http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl
Platform-Specific Documents
The following documents are available for the Cisco uBR7200 series universal broadband routers on
Cisco.com and the Documentation CD-ROM:
•
Cisco uBR7200 Series Hardware Installation Guide
•
Cisco uBR7200 Series Software Configuration Guide
•
Cisco uBR7200 Series Cable Modem Card Hardware Installation Guide
•
Broadband Cable Command Reference Guide
•
Cisco CMTS Feature Guide
•
Cisco uBR7200 Series Configuration Notes
•
Cisco uBR7200 Series Software Features
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Related Documentation
•
Cisco uBR7200 Series Software Release Notes
•
Cisco Quick Start Guide—Rack-Mounting the Cisco RF Switch with the Cisco uBR7246VXR
•
Cisco Quick Start Guide—Cabling the Cisco RF Switch to the Cisco uBR7246VXR
On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Documentation Home Page: Broadband Access: Cable:
Cisco uBR7200 Series Universal Broadband Routers
Note
The Broadband Command Consolidation is available on Cisco.com through the following path:
Technical Documents: Documentation Home Page: Broadband/Cable Solutions
On the Documentation CD-ROM:
Cisco Product Documentation: Broadband/Cable Solutions: Cisco uBR7200 Series Universal
Broadband Routers
Note
The Broadband Command Consolidation is available on the Documentation CD-ROM through the
following path:
Cisco Product Documentation: Broadband/Cable Solutions
Tip
Information about software features of the Cisco uBR7200 series universal broadband router are
available on Cisco.com at the following URL:
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/cmtsfg.html
Feature Modules
Feature modules describe new software enhancements, committed as features, supported by Cisco IOS
Release 12.3(23)BC6, and are updates to the Cisco IOS documentation set. A feature module consists of
a brief overview of the feature, benefits, and configuration tasks, and a command reference. As updates,
the feature modules are available online only. Feature module information is incorporated in the next
printing of the Cisco IOS documentation set.
On Cisco.com at:
Technical Documents: Cisco IOS Software: Cisco IOS Release 12.3: New Feature Documentation
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.3: New
Feature Documentation
Cisco Feature Navigator
Cisco IOS software is packaged in feature sets that are supported on specific platforms. To get updated
information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature
Navigator dynamically updates the list of supported platforms as new platform support is added for the
feature.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Related Documentation
Cisco Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS
software images support a specific set of features and which features are supported in a specific
Cisco IOS image. You can search by feature or release. Under the release section, you can compare
releases side by side to display both the features unique to each software release and the features in
common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or
lost your account information, send a blank e-mail to [email protected]. An automatic check
will verify that your e-mail address is registered with Cisco.com. If the check is successful, account
details with a new random password will be e-mailed to you.
Qualified users can establish an account on Cisco.com by following the directions found at this URL:
http://www.cisco.com/web/siteassets/account/index.html
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology
releases occur. For the most current information, go to the Cisco Feature Navigator home page at the
following URL:
http://www.cisco.com/go/fn
Cisco IOS Software Documentation Set
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS
command references, and several other supporting documents. The Cisco IOS software documentation
set is shipped with your order in electronic form on the Documentation CD-ROM, unless you
specifically ordered the printed versions.
Documentation Modules
Each module in the Cisco IOS documentation set consists of one or more configuration guides and one
or more corresponding command references. Chapters in a configuration guide describe protocols,
configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration
examples. Chapters in a command reference provide complete command syntax information. Use each
configuration guide with its corresponding command reference.
On Cisco.com and the Documentation CD-ROM, two master hot-linked documents provide information
for the Cisco IOS software documentation set.
On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration
Guides and Command References
On the Documentation CD-ROM:
Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration Guides and Command
References
Release 12.3 Documentation Set
Note
You can find the most current Cisco IOS documentation on Cisco.com and the Documentation
CD-ROM. These electronic documents may contain updates and modifications made after the paper
documents were printed.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Obtaining Documentation, Obtaining Support, and Security Guidelines
On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Cisco IOS Software Configuration: Cisco IOS Release 12.3: Configuration
Guides and Command References
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.3:
Configuration Guides and Command References
Note
The Cisco Management Information Base (MIB) User Quick Reference publication is no longer
published. For the latest list of MIBs supported by Cisco, see Cisco Network Management Toolkit on
Cisco.com. From Cisco.com, click on the following path: Service & Support: Software Center:
Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB.
Obtaining Documentation, Obtaining Support, and Security
Guidelines
For information on obtaining documentation, obtaining support, providing documentation feedback,
security guidelines, and also recommended aliases and general Cisco documents, see the monthly
What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical
documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
This document is to be used in conjunction with the documents listed in the “Related Documentation” section.
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of
Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The
use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and
figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and
coincidental.
© 2011 Cisco Systems, Inc. All rights reserved.
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
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Obtaining Documentation, Obtaining Support, and Security Guidelines
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
OL-6763-49
357
Obtaining Documentation, Obtaining Support, and Security Guidelines
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.3BC
358
OL-6763-49