Release Notes for Cisco IOS Release
12.2(33)SCB for Cisco uBR10012 Routers
June 20, 2011
Cisco Systems, Inc.
www.cisco.com
Cisco has more than 200 offices worldwide.
Addresses, phone numbers, and fax numbers
are listed on the Cisco website at
www.cisco.com/go/offices.
Text Part Number: OL-29740-06
THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL
STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT
WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.
THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT
SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE
OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.
The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public
domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.
NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH
ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT
LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF
DEALING, USAGE, OR TRADE PRACTICE.
IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING,
WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO
OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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 and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display
output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in
illustrative content is unintentional and coincidental.
Release Notes for Cisco IOS Release 12.2(33)SCB for Cisco uBR10012 Routers
© 2012-2014 Cisco Systems, Inc. All rights reserved.
CONTENTS
CHAPTER
1
Introduction
1-1
Inheritance Information
1-1
System Requirements 1-2
Memory Requirements 1-2
Hardware Supported 1-3
Cable Interface Line Cards Supported 1-3
Cisco uBR10012 Universal Broadband Router Line Cards Supported 1-5
Other Hardware Supported 1-5
Verifying the Software Version 1-5
Upgrading to a New Software Release 1-5
Microcode Software 1-6
SPA FPD Image Packages for the Cisco uBR10012 1-6
Upgrading from PRE2 to PRE4 Processors 1-6
Upgrading from Cisco IOS Release 12.3BC or Earlier Cisco IOS Software Release 1-7
Feature Support 1-7
Cisco CMTS User Documentation References for Cisco IOS Release 12.2SC 1-7
Cisco Feature Navigator 1-9
New and Changed Information 1-10
New Hardware Features in Cisco IOS Release 12.2(33)SCB11 1-11
New Hardware Features in Cisco IOS Release 12.2(33)SCB10 1-11
New Hardware Features in Cisco IOS Release 12.2(33)SCB9 1-11
New Hardware Features in Cisco IOS Release 12.2(33)SCB8 1-11
New Hardware Features in Cisco IOS Release 12.2(33)SCB7 1-11
New Hardware Features in Cisco IOS Release 12.2(33)SCB6 1-12
New Hardware Features in Cisco IOS Release 12.2(33)SCB5 1-12
New Hardware Features in Cisco IOS Release 12.2(33)SCB4 1-12
New Hardware Features in Cisco IOS Release 12.2(33)SCB3 1-12
New Hardware Features in Cisco IOS Release 12.2(33)SCB2 1-12
New Hardware Features in Cisco IOS Release 12.2(33)SCB1 1-12
New Hardware Features in Cisco IOS Release 12.2(33)SCB 1-12
1-Port 10 Gigabit Ethernet Shared Port Adapter, LANPHY XFP Optics
5-Port Gigabit Ethernet Shared Port Adapter 1-13
Cisco 10000 Series SPA Interface Processor-600 Support 1-13
Cisco 10000 Series Performance Routing Engine 4 1-14
Copper SFP Support for HHGE on the Cisco uBR10012 Router 1-14
1-12
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1
Contents
DOCSIS Timing and Control Card (DTCC) 1-14
New Software Features in Cisco IOS Release 12.2(33)SCB11 1-15
Modified Software Features in Cisco IOS Release 12.2(33)SCB11 1-15
New Software Features in Cisco IOS Release 12.2(33)SCB10 1-16
IPv6 Support on Multiple Subinterfaces 1-16
Suppressing Downstream and Upstream Peak Rate TLVs for pre DOCSIS 3.0 Cable
Modems 1-16
Modified Software Features in Cisco IOS Release 12.2(33)SCB10 1-16
New Software Features in Cisco IOS Release 12.2(33)SCB9 1-16
Modified Software Features in Cisco IOS Release 12.2(33)SCB9 1-16
New Software Features in Cisco IOS Release 12.2(33)SCB8 1-16
Modified Software Features in Cisco IOS Release 12.2(33)SCB8 1-17
New Software Features in Cisco IOS Release 12.2(33)SCB7 1-17
Modified Software Features in Cisco IOS Release 12.2(33)SCB7 1-17
New Software Features in Cisco IOS Release 12.2(33)SCB6 1-17
Modified Software Features in Cisco IOS Release 12.2(33)SCB6 1-17
New Software Features in Cisco IOS Release 12.2(33)SCB5 1-17
Features Integrated into Cisco IOS Release 12.2(33)SCB5 1-17
Modified Software Features in Cisco IOS Release 12.2(33)SCB5 1-17
New Software Features in Cisco IOS Release 12.2(33)SCB4 1-18
Direct Load for Cable Modems 1-18
Adding DSG Tunnel Group to a Subinterface 1-18
Modified Software Features in Cisco IOS Release 12.2(33)SCB4 1-18
CM Steering Enhancement 1-18
New Software Features in Cisco IOS Release 12.2(33)SCB3 1-19
M-CMTS Enhancement 1-19
Modified Software Features in Cisco IOS Release 12.2(33)SCB3 1-19
New Software Features in Cisco IOS Release 12.2(33)SCB2 1-19
Modified Software Features in Cisco IOS Release 12.2(33)SCB2 1-19
New Software Features in Cisco IOS Release 12.2(33)SCB1 1-19
DOCSIS 3.0 Downstream Peak Traffic Rate TLV Support for ERBA 1-20
Enhanced Show Tech 1-20
Cable Modem QoS Information 1-20
RCC Spanning Across Multiple SPAs for VDOC Broadcast 1-21
SAMIS CLC-RP Traffic Throttling 1-21
Service Disruption during ISSU 1-21
Modified Software Features in Cisco IOS Release 12.2(33)SCB1 1-22
New Software Features in Cisco IOS Release 12.2(33)SCB 1-22
DOCSIS OSSI Event Messages 1-22
Bypass the 24 Hour Timer for WB CM Use of Failed RF Channels 1-23
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2
Contents
CM Steering 1-23
CMTS IPDR/SP 1-24
DOCSIS 3.0 Downstream Bonding for Bronze Certification 1-24
DOCSIS 3.0 Multicast Support 1-25
DOCSIS WFQ Scheduler 1-25
Dynamic Bandwidth Sharing 1-26
Dynamic Service Transaction ID Allocation 1-26
IGMP-Triggered VDOC Broadcast Support 1-27
IP SLAs—Random Scheduler 1-27
IP SLAs—Additional Threshold Traps 1-27
IP SLAs—Proactive Threshold Monitoring of IP SLAs Operations 1-27
IP SLAs—Analyzing IP Service Levels Using the UDP Jitter Operation 1-28
IP SLAs—Analyzing VoIP Service Levels Using the UDP Jitter Operation 1-28
IP SLAs—Analyzing IP Service Levels Using the TCP Connect Operation 1-28
IP SLAs—Scheduler 1-28
IP SLAs—Proactive Threshold Monitoring of IP SLAs Operations 1-28
IP SLAs—One Way Measurement 1-28
IP SLAs—Multioperation Scheduling of IP SLAs Operations 1-28
IP SLAs—MPLS VPN Awareness 1-28
IP SLAs—Analyzing IP Service Levels Using the ICMP Path Echo Operation 1-28
IP SLAs—Analyzing IP Service Levels Using the HTTP Operation 1-29
IP SLAs—Analyzing IP Service levels Using the FTP Operation 1-29
IP SLAs—Analyzing IP Service Levels Using the DNS Operation 1-29
IP SLAs—Distribution of Statistics 1-29
IP SLAs—Analyzing IP Service Levels Using the DHCP Operation 1-29
IP SLAs—CLI Phase 3 1-29
ISSU—In Service Software Upgrade 1-29
Line Card High Availability (HA) Support for WB Cable Modems 1-30
Load Balancing Prohibition Based on Group Policy ID 1-30
MxN MAC Domain DS Load Balancing 1-31
Onboard Failure Logging (OBFL) 1-31
PXF Divert Rate Limit Enhancements 1-31
RSVP-Based Video on Demand Support over DOCSIS 1-32
Subscriber Management Packet Filtering for DOCSIS 2.0 1-32
Subscriber ID Support for Packetcable 1-33
Subscriber Traffic Management Version 1.2 1-33
Upstream Utilization Optimization 1-34
Voice Support on WB Modems 1-35
VoIP SFID Mapping 1-35
Wideband Modem Resiliency 1-35
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
3
Contents
Modified Software Features in Cisco IOS Release 12.2(33)SCB
1-36
MIBs 1-36
New and Changed MIB Information in Cisco IOS Release 12.2(33)SCB
Limitations and Restrictions 1-37
Unsupported Hardware 1-37
Software Feature Restrictions 1-37
DOCSIS 1-37
DTI Card Configuration 1-38
In-Service Software Upgrade (ISSU)
MIBs Restrictions 1-38
PacketCable 1-38
PCMCIA 1-38
PXF 1-38
Redundancy 1-38
Wideband 1-39
Important Notes
1-38
1-39
Documentation Updates 1-41
Command-Line Interface Changes and Notes
1-41
Obtaining Documentation and Submitting a Service Request
CHAPTER
2
Caveat List for Cisco IOS Release 12.2(33)SCB 2-1
Cisco Bug Search 2-1
Open Caveats—Cisco IOS Release 12.2(33)SCB11 2-2
Resolved Caveats—Cisco IOS Release 12.2(33)SCB11 2-4
Open Caveats—Cisco IOS Release 12.2(33)SCB10 2-4
Resolved Caveats—Cisco IOS Release 12.2(33)SCB10 2-7
Open Caveats—Cisco IOS Release 12.2(33)SCB9 2-10
Resolved Caveats—Cisco IOS Release 12.2(33)SCB9 2-12
Open Caveats—Cisco IOS Release 12.2(33)SCB8 2-12
Resolved Caveats—Cisco IOS Release 12.2(33)SCB8 2-14
Open Caveats—Cisco IOS Release 12.2(33)SCB7 2-14
Resolved Caveats—Cisco IOS Release 12.2(33)SCB7 2-23
Open Caveats—Cisco IOS Release 12.2(33)SCB6 2-32
Resolved Caveats—Cisco IOS Release 12.2(33)SCB6 2-42
Open Caveats—Cisco IOS Release 12.2(33)SCB5 2-43
Resolved Caveats — Cisco IOS Release 12.2(33)SCB5 2-55
Open Caveats—Cisco IOS Release 12.2(33)SCB4 2-70
Resolved Caveats — Cisco IOS Release 12.2(33)SCB4 2-89
Open Caveats—Cisco IOS Release 12.2(33)SCB3 2-102
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
4
1-41
1-37
Contents
Resolved Caveats — Cisco IOS Release 12.2(33)SCB3 2-119
Open Caveats—Cisco IOS Release 12.2(33)SCB2 2-140
Resolved Caveats — Cisco IOS Release 12.2(33)SCB2 2-146
Open Caveats — Cisco IOS Release 12.2(33)SCB1 2-147
CMTS-Application 2-147
CMTS-Database 2-149
CMTS-DOCSIS 2-149
CMTS-Management 2-150
CMTS-Platform 2-150
CMTS-Redundancy 2-153
CMTS-Voice 2-154
CMTS-Wideband 2-154
Resolved Caveats — Cisco IOS Release 12.2(33)SCB1 2-155
CMTS-Application 2-155
CMTS-DOCSIS 2-160
CMTS-Drivers 2-162
CMTS-ISSU 2-163
CMTS-Management 2-163
CMTS-Platform 2-164
CMTS-PRE4 2-167
CMTS-PXF 2-167
CMTS-Redundancy 2-167
CMTS-Spectrum 2-168
CMTS-Voice 2-169
CMTS-Wideband 2-169
Open Caveats — Cisco IOS Release 12.2(33)SCB 2-169
CMTS-Application 2-169
CMTS-Database 2-171
CMTS-DOCSIS 2-171
CMTS-Drivers 2-172
CMTS-Management 2-172
CMTS-Packetcable 2-172
CMTS-Platform 2-173
CMTS-Redundancy 2-175
CMTS-Voice 2-176
CMTS-Wideband 2-176
Resolved Caveats — Cisco IOS Release 12.2(33)SCB 2-177
CMTS-Application 2-177
CMTS-Platform 2-177
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
5
Contents
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
6
CH A P T E R
1
Introduction
This document contains information about downloading and installing Cisco IOS Release 12.2(33)SCB.
It also provides new and changed information, hardware support, limitations and restrictions, and
caveats for Cisco IOS Release 12.2(33)SCB.
For software caveats that apply to the Cisco IOS Release 12.2(33)SCB on the Cisco uBR7200 series
routers, see the corresponding release notes for Cisco uBR7200 Series Routers.
We recommend 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/customer/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.
This chapter includes the following sections:
•
Inheritance Information, page 1-1
•
System Requirements, page 1-2
•
New and Changed Information, page 1-10
•
MIBs, page 1-36
•
Limitations and Restrictions, page 1-37
•
Important Notes, page 1-39
•
Obtaining Documentation and Submitting a Service Request, page 1-41
Inheritance Information
This section describes the related Cisco IOS software releases that are part of the Cisco IOS Release
12.2SC train.
SCA-based releases
•
Prior Cisco IOS 12.2SCA releases
•
Cisco IOS Release 12.3(21)BC
•
Cisco IOS Release 12.2(31)SB (which is based on Cisco IOS Release 12.2(25)S and includes many
features from Cisco IOS Release 12.2T)
•
Cisco IOS Release 12.2(33)SRC
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-1
Chapter 1
Introduction
System Requirements
SCB-based releases
•
Prior Cisco IOS 12.2SCA releases
•
Cisco IOS Release 12.3(21)BC
•
Cisco IOS Release 12.3(23)BC
•
Cisco IOS Release 12.2(33)SB
•
Cisco IOS Release 12.2(33)SRC
•
All features in the above releases are available from Cisco IOS Release 12.2(33)SCB onwards.
System Requirements
These sections describe the system requirements for Cisco IOS Release 12.2(33)SCB:
•
Memory Requirements, page 1-2
•
Hardware Supported, page 1-3
•
Verifying the Software Version, page 1-5
•
Upgrading to a New Software Release, page 1-5
•
Microcode Software, page 1-6
•
Feature Support, page 1-7
Memory Requirements
This section describes the memory requirements for Cisco IOS Release 12.2(33)SCB.
Table 1-1 displays the memory recommendations for the Cisco uBR10012 universal broadband router
with Cisco IOS Release 12.2(33)SCB feature sets.
Table 1-1
Memory Recommendations for the Cisco uBR10012 Router
Cisco uBR10012
Route Processor Software Image
Recommended
Flash Memory
Recommended
DRAM Memory1
Runs
From
DOCSIS Base 3 DES image and
Lawful Intercept for Cisco PRE22
PRE2
ubr10k2-k9p6u2-mz
128 MB
1.0 GB
RAM
DOCSIS Base 3 DES image and
Lawful Intercept for Cisco PRE4
PRE4
ubr10k4-k9p6u2-mz
128 MB
2.0 GB
RAM
DOCSIS BPI and Lawful Intercept PRE4
for Cisco PRE4
ubr10k4-k8p6u2-mz
128 MB
2.0 GB
RAM
Feature Set
1. DRAM memory is not configurable on the Cisco uBR10012 router.
2. PRE = Performance Routing Engine
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-2
Chapter 1
Introduction
System Requirements
Hardware Supported
The following sections list the hardware supported on various Cisco IOS Releases:
•
Cable Interface Line Cards Supported, page 1-3
•
Microcode Software, page 1-6
•
Other Hardware Supported, page 1-5
Cable Interface Line Cards Supported
Table 1-2 provides information about the cable interface line cards supported in
Cisco IOS Release 12.2(33)SCB.
Table 1-2
Cable Interface Line Cards Supported in Cisco IOS Release 12.2(33)SCB
Supported Cable Interface Line Card
Minimum Cisco IOS Release Required Processor Engine
Cisco uBR10-MC5X20S/U/H—maximum 8
Cisco IOS Release 12.2SCA
PRE2/PRE4
OIR of Cable Interface Line Cards on the Cisco uBR10012 Universal Broadband Router
The Cisco uBR10012 series universal broadband routers support online insertion and removal (OIR) of
cable interface line cards only when exchanging cable interface line cards of the same type.
Prerequisites for Performing OIR
•
Save the line card configuration before starting the OIR.
•
Perform OIR when the CMTS is up and running.
•
Change the standby card (if available) to HOT state.
•
Save the startup configuration file before any reload of the system (if there is a need to reload), after
a successful OIR.
Restrictions During OIR Process
•
OIR upgrade cannot be performed when the standby PRE is being loaded.
Performing an OIR of a Cable Interface Line Card
Step 1
In global configuration mode, enter the cr10k card oir-compatibility command for the cable interface
line card to perform an OIR, as shown in the following example:
Router(config)# cr10k card 8/0 oir-compatibility
This command helps preserve the configuration and performs some internal synchronization to make
sure that the OIR runs successfully.
Step 2
Save the configuration to ensure the transition, as shown in the following example:
Router# copy running-config startup-config
Step 3
Turn the power off to the line card using the cable power off command for the slot that is being replaced,
as shown in the following example:
Router# cable power off 8/0
Line Card 8/0 is POWERED OFF
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-3
Chapter 1
Introduction
System Requirements
This powers off the line card gracefully.
Step 4
Before removing the card, verify that the proper grounding instructions have been followed for the card.
For more information about preventing electrostatic discharge (ESD) damage, see:
http://www.cisco.com/warp/public/109/cable-linecard-handling.pdf
Step 5
Remove the line card.
Step 6
Replace it with the new line card in the slot.
Step 7
Enter the cable power on command to power up the line card, as shown in the following example:
Router# cable power on 8/0
Step 8
Enter the show interface cable command and verify that the card and line protocol is “up” as shown in
the following example:
Router# show interface cable 8/0/0
Cable8/0/0 is up, line protocol is up
Hardware is BCM3210 ASIC, address is 000a.13e8.1ca8 (bia 000a.13e8.1a60)
Internet address is 10.1.1.3/24
MTU 1500 bytes, BW 27000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation, loopback not set, keepalive not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 4d07h, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queuing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 1834000 bits/sec, 2385 packets/sec
5 minute output rate 1982000 bits/sec, 2431 packets/sec
24461542 packets input, 2348214388 bytes, 0 no buffer
Received 1979 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
24854257 packets output, 2536222931 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Step 9
Enter the show controllers cable command and verify the hardware status, as shown in the following
example:
Router# show controllers cable 8/0/0
Cable8/0/0 JIB hardware status:
JIB Downstream port
Enabled
JIB Upstream
port 0 Enabled
JIB Upstream
port 1 Enabled
JIB Upstream
port 2 Enabled
JIB Upstream
port 3 Enabled
Cable8/0/0 Upconverter is Enabled Output is Enabled
Model: 74-3153-02 Serial Number: 0WAV090200A1 CLEI Code: FFFFFFFFFF
HW Rev:
PC2D0109 SW Rev: 203, NVRAM Rev: 021 ECI numb
Step 10
Verify the configuration with the show running-configuration command.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-4
Chapter 1
Introduction
System Requirements
Cisco uBR10012 Universal Broadband Router Line Cards Supported
The Cisco uBR10012 universal broadband router supports up to four network line cards with any
combination of the following cards:
Note
•
Cisco Half-Height Gigabit Ethernet (HHGE) line card
•
Cisco uBR10012 OC-48 DPT/POS interface module
Cisco HHGE line card is supported only with PRE2.
Other Hardware Supported
Table 1-3 provides information about other hardware supported in Cisco IOS Release 12.2(33)SCB.
Table 1-3
Other Hardware Supported in This Cisco IOS Release
Cisco uBR10012
Router
Minimum Cisco IOS Release
Hardware
Cisco Wideband SIP and Cisco Wideband
SPA
Yes
Cisco IOS Release 12.2(33)SCA
Cisco uBR10012 universal broadband router Yes
DTCC card
Cisco IOS Release 12.2(33)SCB
Cisco uBR10012 universal broadband router Yes
TCC+ card
Cisco IOS Release 12.2(33)SCA
Cisco 10000 Series SIP-600 and WAN SPAs Yes
(5-Port Gigabit Ethernet and the 1-Port 10
Gigabit Ethernet SPAs)
Cisco IOS Release 12.2(33)SCB
Cisco 10000 Series SIP-600 with the
Cisco Wideband SPA
Cisco IOS Release12.2(33)SCB
Yes
Verifying the Software Version
To determine the version of the Cisco IOS software running on your Cisco universal broadband router,
log in to the router and enter the show version EXEC command:
Router# show version
Cisco IOS Software, 10000 Software (UBR10K4-K9P6U2-M), Version 12.2(33)SCB
EXPERIMENTAL IMAGE ENGINEERING C10K_WEEKLY BUILD, synced to
MAYFLOWER_BASE_FOR_V122_33_SB_THROTTLE
Copyright (c) 1986-2009 by Cisco Systems, Inc.
ROM: System Bootstrap, Version 12.4(12.2r)T, RELEASE SOFTWARE (fc1)
Upgrading to a New Software Release
For information about selecting a new Cisco IOS software release, see "How to Choose a Cisco IOS
Software Release” at the following location:
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-5
Chapter 1
Introduction
System Requirements
http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/
products_tech_note09186a00800fb9d9.shtml
For information about upgrading the Cisco universal broadband routers, see the Software Installation
and Upgrade Procedures document at the following location:
http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094c07.shtml
For Cisco IOS upgrade ordering instructions, see:
http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/957_pp.htm
To choose a new Cisco IOS software release based on information about defects that affect that software,
use Bug Search Tool (BST) at the following URL:
https://tools.cisco.com/bugsearch/
Microcode Software
This section describes microcode software that is supported for the Cisco uBR10012 router.
SPA FPD Image Packages for the Cisco uBR10012
The field-programmable device (FPD) image packages are used to update the shared port adapter (SPA)
FPD images. If a discrepancy exists between a SPA FPD image and the Cisco IOS image that is running
on the router, the SPA is deactivated until this discrepancy is resolved.
Note
The maximum time to upgrade the FPD image on one SPA is 2 minutes. The total FPD upgrade time
depends on the number of SPAs.
Note
The FPD image package that is used to upgrade SPAs on a router that runs
Cisco IOS Release 12.2(33)SCB is the ubr10k-fpd-pkg.122-33.SCB pkg file.
Table 4
Shared Port Adapter FPD Image Package Contents
FPD Component
Name
FPD Component
Version
Minimum Required
Hardware Version
5-Port Gigabit Ethernet 1
SPA
I/O FPGA
1.10
0.0
1-Port 10-Gigabit
Ethernet SPA
1
I/O FPGA
1.9
0.0
Cisco Wideband SPA
1
BLAZE FPGA
1285.1446
0.0
Supported SPAs
FPD ID
Upgrading from PRE2 to PRE4 Processors
A cold start of the router is required for an upgrade to a PRE4 from a PRE2 on a Cisco uBR10012
universal broadband router from a different release train, such as Cisco IOS Release 12.3(23)BC or other
BC releases.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-6
Chapter 1
Introduction
System Requirements
For more information, see Cisco uBR10012 Universal Broadband Router Performance Routing Engine
Module at:
http://www.cisco.com/en/US/docs/interfaces_modules/cable/performance_routing_engine/installation/
guide/pre5096.html
Upgrading from Cisco IOS Release 12.3BC or Earlier Cisco IOS Software Release
For more information, see the Cisco uBR10012 Router Release Notes for
Cisco IOS Release 12.2(33)SCA at the following URL:
http://www.cisco.com/en/US/products/hw/cable/ps2209/prod_release_notes_list.html
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 or 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].
Cisco CMTS User Documentation References for Cisco IOS Release 12.2SC
Table 1-5 provides information about the important user guides in Cisco IOS Release 12.2SC.
Table 1-5
Important Guides in Cisco IOS Release 12.2SC
Guide
Description
Documentation Roadmap
Describes a set of Cisco CMTS documents and contains links to the referenced
documents.
Go to the following link to access this document:
http://www.cisco.com/c/en/us/td/docs/cable/cmts/ubr10012/roadmap/u10krdmp.html
Command Reference
Provides information about the software commands used to configure a Cisco CMTS.
Includes command syntax, default value, value range, command mode, usage guidelines,
and examples.
Go to the following link to access this document:
http://www.cisco.com/c/en/us/td/docs/cable/cmts/cmd_ref/b_cmts_cable_cmd_ref.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-7
Chapter 1
Introduction
System Requirements
Guide
Description
Design Guides
Describes how to plan, install, and configure a Cisco CMTS. Contains information about
the supported technologies, interfaces and protocols and can also contain special
installation considerations, network diagrams, example applications, system design, and
environmental recommendations.
Go to the following link to access this document set:
http://www.cisco.com/c/en/us/support/video/ubr10000-series-universal-broadband-rout
ers/products-implementation-design-guides-list.html
Install and Upgrade Guides
Provides step-by-step instructions for installing or upgrading a Cisco CMTS. Also
includes line card installation guides, shipping documents, safety information, and
quick-start guides for experienced users.
Go to the following link to access this document set:
http://www.cisco.com/c/en/us/support/video/ubr10000-series-universal-broadband-rout
ers/products-installation-guides-list.html
Configuration Guides
Contains detailed, step-by-step instructions for configuring a Cisco CMTS, including
software feature guides, configuration examples, network diagrams, and technical
concepts.
Go to the following link to access this document set:
http://www.cisco.com/c/en/us/support/video/ubr10000-series-universal-broadband-rout
ers/products-installation-and-configuration-guides-list.html
Error and System Messages
Lists error and system messages for a Cisco CMTS, including any recommended user
action for each message.
Go to the following link to access this document:
http://www.cisco.com/c/en/us/support/video/ubr10000-series-universal-broadband-rout
ers/products-system-message-guides-list.html
Troubleshooting Guides
Provides problem-solving techniques for a Cisco CMTS, including methods to identify
problems based on symptoms and recommended actions for resolution.
Go to the following link to access this document set:
http://www.cisco.com/c/en/us/support/video/ubr10000-series-universal-broadband-rout
ers/products-troubleshooting-guides-list.html
Cisco Feature Navigator
The 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 the 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
verifies that your e-mail address is registered with Cisco.com. If the check is successful, account details
with a new random password is e-mailed to you. Qualified users can establish an account on Cisco.com
by following the directions found at this URL:
https://tools.cisco.com/RPF/register/register.do
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-8
Chapter 1
Introduction
System Requirements
The 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 the Cisco Feature Navigator, see the FAQs at the following URL:
http://www.cisco.com/support/FeatureNav/FNFAQ.html
Determining Which Software Images Support a Specific Feature
To identify the software images (feature sets) in Cisco IOS Release 12.2(33)SC that support a specific
feature:
Step 1
Go to the Cisco Feature Navigator home page. Enter your Cisco.com login.
Step 2
Click Search by Feature.
Step 3
To find a feature, use either Filter by full or partial feature name or search for available 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 is displayed in the text box.
Step 4
Select a feature from the Available Features pane, and click Add to add a feature to the Selected Features
pane.
Note
To learn more about a feature in the list, click Show Descriptions.
Repeat this step to add additional features. A maximum of 20 features can be chosen for a single search.
Step 5
Click Continue when you are finished selecting features.
Step 6
From the Major Release drop-down menu, choose 12.2SC.
Step 7
From the Release drop-down menu, choose the appropriate maintenance release.
Step 8
From the Platform Family drop-down menu, select the appropriate hardware platform. The Search
Results table lists all the software images (feature sets) that support the selected feature.
Determining Which Features Are Supported in a Specific Software Image
To determine the features supported in a specific software image (feature set) in
Cisco IOS Release 12.2(33)SC:
Step 1
Go to the Cisco Feature Navigator home page. Enter your Cisco.com login.
Step 2
Click Compare Images.
Step 3
From the Software drop-down menu in the Select First Image Parameters pane, choose IOS.
Step 4
From the Major Release drop-down menu, choose 12.2SC.
Step 5
From the Release Number drop-down menu, choose the appropriate maintenance release.
Step 6
From the Platform Family drop-down menu, choose the appropriate hardware platform.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-9
Chapter 1
Introduction
New and Changed Information
Step 7
From the Feature Set drop-down menu, choose the appropriate feature set. The Search Results table lists
all the features that are supported by the selected feature set (software image).
New and Changed Information
The following sections list the new and modified hardware and software features supported on the
Cisco uBR10012 universal broadband routers in Cisco IOS Release 12.2(33)SCB:
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB11, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB10, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB9, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB8, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB7, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB6, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB5, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB4, page 1-11
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB3, page 1-12
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB2, page 1-12
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB1, page 1-12
•
New Hardware Features in Cisco IOS Release 12.2(33)SCB, page 1-12
•
New Software Features in Cisco IOS Release 12.2(33)SCB11, page 1-15
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB11, page 1-15
•
New Software Features in Cisco IOS Release 12.2(33)SCB10, page 1-16
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB10, page 1-16
•
New Software Features in Cisco IOS Release 12.2(33)SCB9, page 1-16
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB9, page 1-16
•
New Software Features in Cisco IOS Release 12.2(33)SCB8, page 1-16
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB8, page 1-17
•
New Software Features in Cisco IOS Release 12.2(33)SCB7, page 1-17
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB7, page 1-17
•
New Software Features in Cisco IOS Release 12.2(33)SCB6, page 1-17
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB6, page 1-17
•
New Software Features in Cisco IOS Release 12.2(33)SCB5, page 1-17
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB5, page 1-17
•
New Software Features in Cisco IOS Release 12.2(33)SCB4, page 1-18
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB4, page 1-18
•
New Software Features in Cisco IOS Release 12.2(33)SCB3, page 1-19
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB3, page 1-19
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-10
Chapter 1
Introduction
New and Changed Information
•
New Software Features in Cisco IOS Release 12.2(33)SCB2, page 1-19
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB2, page 1-19
•
New Software Features in Cisco IOS Release 12.2(33)SCB1, page 1-19
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB1, page 1-22
•
New Software Features in Cisco IOS Release 12.2(33)SCB, page 1-22
•
Modified Software Features in Cisco IOS Release 12.2(33)SCB, page 1-36
New Hardware Features in Cisco IOS Release 12.2(33)SCB11
There are no new hardware features in Cisco IOS Release 12.2(33)SCB11.
New Hardware Features in Cisco IOS Release 12.2(33)SCB10
There are no new hardware features in Cisco IOS Release 12.2(33)SCB10.
New Hardware Features in Cisco IOS Release 12.2(33)SCB9
There are no new hardware features in Cisco IOS Release 12.2(33)SCB9.
New Hardware Features in Cisco IOS Release 12.2(33)SCB8
There are no new hardware features in Cisco IOS Release 12.2(33)SCB8.
New Hardware Features in Cisco IOS Release 12.2(33)SCB7
There are no new hardware features in Cisco IOS Release 12.2(33)SCB7.
New Hardware Features in Cisco IOS Release 12.2(33)SCB6
There are no new hardware features in Cisco IOS Release 12.2(33)SCB6.
New Hardware Features in Cisco IOS Release 12.2(33)SCB5
There are no new hardware features in Cisco IOS Release 12.2(33)SCB5.
New Hardware Features in Cisco IOS Release 12.2(33)SCB4
There are no new hardware features in Cisco IOS Release 12.2(33)SCB4.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-11
Chapter 1
Introduction
New and Changed Information
New Hardware Features in Cisco IOS Release 12.2(33)SCB3
There are no new hardware features in Cisco IOS Release 12.2(33)SCB3.
New Hardware Features in Cisco IOS Release 12.2(33)SCB2
There are no new hardware features in Cisco IOS Release 12.2(33)SCB2.
New Hardware Features in Cisco IOS Release 12.2(33)SCB1
There are no new hardware features in Cisco IOS Release 12.2(33)SCB1.
New Hardware Features in Cisco IOS Release 12.2(33)SCB
This section describes the hardware features supported in Cisco IOS 12.2(33)SCB. Some features may
be new to Cisco IOS Release 12.2(33)SCB but were released in earlier Cisco IOS software releases.
1-Port 10 Gigabit Ethernet Shared Port Adapter, LANPHY XFP Optics
Platform: Cisco uBR10012 with PRE-4
The Cisco 1-Port 10-GE SPA is a single height SPA. The interface connector on this SPA is a fiber optic
receiver that supports one XFP. The SPA provide standards-based 10-GE implementation for
compatibility and interoperability. For more information, see the Cisco uBR10012 Universal Broadband
Router SIP and SPA Hardware Installation Guide and the Cisco uBR10012 Universal Broadband Router
SIP and SPA Software Configuration Guide:
http://www.cisco.com/en/US/products/ps6267/prod_installation_guides_list.html
5-Port Gigabit Ethernet Shared Port Adapter
Platform: Cisco uBR10012 with PRE-4
The Cisco 5-Port GE SPA is a single height SPA. The interface connector on this SPA is a fiber optic
receiver that supports SFPs. The SPA provide standards-based GE implementation for compatibility and
interoperability. For more information, see the Cisco uBR10012 Universal Broadband Router SIP and
SPA Hardware Installation Guide and the Cisco uBR10012 Universal Broadband Router SIP and SPA
Software Configuration Guide:
http://www.cisco.com/en/US/products/ps6267/prod_installation_guides_list.html
Cisco 10000 Series SPA Interface Processor-600 Support
The Cisco 10000 Series SPA Interface Processor-600 (referred to as the Cisco SIP-600) is a SPA interface processor (SIP) that functions as a carrier card for shared port adapters (SPAs) on the Cisco uBR10012
router. The SIP is compatible with the following platform-independent SPAs:
•
Cisco Wideband SPA
•
5-Port Gigabit Ethernet shared port adapter
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-12
Chapter 1
Introduction
New and Changed Information
•
1-Port 10-Gigabit Ethernet shared port adapter (supported only with PRE4 configuration)
The Cisco SIP-600 is supported on both PRE2 and PRE4 configurations. With a PRE2 configuration, the
Cisco SIP-600 can support up to four Cisco Wideband SPAs, and with a PRE4 configuration, the SIP can
support up to six Cisco Wideband SPAs.
The Cisco SIP-600 is a full-height line card that occupies two physical slots in a Cisco uBR10012 router.
Each chassis supports a maximum of two SIPs that can be inserted in the following slots:
•
Slot 1
•
Slot 3
The Cisco SIP-600 supports four bays (subslots) for the installation of SPAs. The SPA bays are
numbered from 0 to 3 on a Cisco uBR10012 router. The number for each SPA bay is indicated by a small
numeric label on the SIP faceplate.
SPAs on a Cisco uBR10012 router use an addressing format that specifies the physical location of the
SIP, SPA, and interface in the format slot/bay/port, where:
•
slot—Specifies the chassis slot number where the SIP is installed.
•
bay—Specifies the secondary slot (subslot) of the SIP where the SPA is installed.
•
port—Specifies the interface number that you want to select on the SPA.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-13
Chapter 1
Introduction
New and Changed Information
For more information about the Cisco SIP-600 and supported SPAs, refer to the following documents:
•
Cisco uBR10012 Universal Broadband Router SIP and SPA Hardware Installation Guide
•
Cisco uBR10012 Universal Broadband Router SIP and SPA Software Configuration Guide
Cisco 10000 Series Performance Routing Engine 4
The Performance Routing Engine 4 (PRE4) is the fifth-generation Parallel eXpress Forwarding (PXF)
packet processing and scheduling engine. The PRE4 performs all Layer 2 and Layer 3 packet
manipulation related to routing and forwarding. The advanced application-specific integrated circuit
(ASIC) technology of the PRE4 supports high performance throughput with IP services enabled on each
port.
The PRE4 runs Cisco IOS Release 12.2(33)SCB and later releases. Benefits of the PRE4 include:
•
800-MHz dual processor
•
64 PXF network processors arranged as 8 columns and 8 rows
•
512-MB packet buffer and 128-MB control memory with error checking and correction (ECC)
•
4-GB ECC-protected Route Processor (RP) memory
•
10-Mpps forwarding performance through the PXF complex
•
5.6-Gbps backplane bandwidth for each full-height backplane slot
•
11.2-Gbps backplane bandwidth to each SPA interface processor (SIP)
•
Maximum transmission unit (MTU) support of 9216 bytes
•
An external CompactFlash Disk slot
•
A 100/1000-MB Ethernet interface for communication between redundant PRE4s
•
Increased port density (supports 10 Gigabit Ethernet line cards over the Cisco SIP-600)
•
Hierarchical Queuing Framework (HQF) that provides up to three levels of service granularity
Copper SFP Support for HHGE on the Cisco uBR10012 Router
The Cisco 1000BASE-T SFP (small form-factor pluggable) module support for the Half-Height Gigabit
Ethernet Line Card is introduced in Cisco IOS Release 12.3(23)BC1 and integrated into Cisco IOS
Release 12.2(33)SCB. SFP modules are input/output devices that plug into a Gigabit Ethernet (GE) port,
linking the port with a fiber-optic network. The modules are used on Cisco platforms that have Gigabit
Ethernet interfaces.The product ID of the Cisco 1000BASE-T SFP module is GLC-T. The Cisco
1000BASE-T SFP module connects a Cisco Gigabit Interface Converter (GBIC) port to Category 5
wiring via a standard RJ-45 interface. The maximum Category 5 wiring distance is 100 m. The module
provides an option of connecting to a backhaul network interface.
DOCSIS Timing and Control Card (DTCC)
On the Cisco uBR10012 universal broadband router, the DTCC card 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.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-14
Chapter 1
Introduction
New and Changed Information
•
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.
Two DTCC cards are installed and 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.
Note
In Cisco IOS Release 12.2(33)SCB and later releases, you must ensure that two DTCC cards are installed
and configured in the Cisco uBR10012 router to properly time the system components and to distribute
clocking correctly. Installing and configuring only a single DTCC card on a Cisco uBR10012 router is
not supported in Cisco IOS Release 12.2(33)SCB and later.
Note
In Cisco IOS Release 12.2(33)SCB and later releases, upgrading the DTCC card electronic
programmable logical devices (EPLD) version, which is already at 0xEF, fails.
Each DTCC card contains two RJ-45 connectors labeled Primary and Secondary, on the front panel.
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.
For more information, refer to the following document:
Cisco uBR10012 Universal Broadband Router DTCC Card
New Software Features in Cisco IOS Release 12.2(33)SCB11
There are no new software features in Cisco IOS Release 12.2(33)SCB11.
Modified Software Features in Cisco IOS Release 12.2(33)SCB11
There are no modified software features in Cisco IOS Release 12.2(33)SCB11.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-15
Chapter 1
Introduction
New and Changed Information
New Software Features in Cisco IOS Release 12.2(33)SCB10
This section lists the new features in Cisco IOS Release 12.2(33)SCB10. Some features may be new to
Cisco IOS Release 12.2(33)SCB10 but were released in earlier Cisco IOS software releases.
IPv6 Support on Multiple Subinterfaces
Starting with Cisco IOS Release 12.2(33)SCB10, IPv6 commands are supported on multiple CMTS
bundle subinterfaces.
For more details on this feature, refer to the IPv6 on Cable feature document at the following location:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_ipv6.html#wp1077229
Suppressing Downstream and Upstream Peak Rate TLVs for pre DOCSIS 3.0 Cable Modems
The DOCSIS 3.0 upstream (US) peak rate TLV 24.27 and downstream (DS) peak rate TLV 25.27 are
enabled on the Cisco CMTS through the cable service class command or the CM configuration file. The
DOCSIS 1.x and DOCSIS 2.0 CMs do not support these TLVs. Ideally, if a DOCSIS 1.x or DOCSIS 2.0
CM receives peak rate TLVs during registration, it should ignore these TLVs and proceed with the
registration. However there are a few old non-compliant pre DOCSIS 3.0 CMs, which may fail to come
online when peak-rate TLVs are received in the registration response from the Cisco CMTS. To
overcome this, the Cisco CMTS has introduced this feature which allows you to suppress sending of
DOCSIS 3.0 peak rate TLVs to the pre DOCSIS 3.0 CMs.
The following command was introduced:
•
cable service attribute withhold-TLV
For more details on this feature, refer to the DOCSIS 1.1 for the Cisco CMTS Routers at the following
location:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_docsis11.html
Modified Software Features in Cisco IOS Release 12.2(33)SCB10
There are no modified software features in Cisco IOS Release 12.2(33)SCB10.
New Software Features in Cisco IOS Release 12.2(33)SCB9
There are no new software features in Cisco IOS Release 12.2(33)SCB9.
Modified Software Features in Cisco IOS Release 12.2(33)SCB9
There are no modified software features in Cisco IOS Release 12.2(33)SCB9.
New Software Features in Cisco IOS Release 12.2(33)SCB8
There are no new software features in Cisco IOS Release 12.2(33)SCB8.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-16
Chapter 1
Introduction
New and Changed Information
Modified Software Features in Cisco IOS Release 12.2(33)SCB8
There are no modified software features in Cisco IOS Release 12.2(33)SCB8.
New Software Features in Cisco IOS Release 12.2(33)SCB7
There are no new software features in Cisco IOS Release 12.2(33)SCB7.
Modified Software Features in Cisco IOS Release 12.2(33)SCB7
There are no modified software features in Cisco IOS Release 12.2(33)SCB7.
New Software Features in Cisco IOS Release 12.2(33)SCB6
There are no new software features in Cisco IOS Release 12.2(33)SCB6.
Modified Software Features in Cisco IOS Release 12.2(33)SCB6
There are no modified software features in Cisco IOS Release 12.2(33)SCB6.
New Software Features in Cisco IOS Release 12.2(33)SCB5
There are no new features supported in Cisco IOS Release 12.2(33)SCB5.
Features Integrated into Cisco IOS Release 12.2(33)SCB5
The Serialized DTCC FPGA Autoupgrade feature introduced in earlier Cisco IOS Releases is now
supported in Cisco IOS Release 12.2(33)SCB5:
The Serialized DTCC FPGA Autoupgrade feature enables automatic upgrade of the FPGA image stored
in the on-board electrically erasable programmable read-only memory (EEPROM). This feature ensures
that the FPGA image upgrade happens sequentially on the two DTCC cards installed on a Cisco
uBR10012 router.
The following commands are new or modified:
•
cable clock upgrade
•
show controllers clock-reference
For detailed information about this feature, see the Cisco uBR10012 Universal Broadband Router DTCC
Card guide at the following URL:
http://www.cisco.com/en/US/docs/interfaces_modules/cable/installation/dtcccard.html
Modified Software Features in Cisco IOS Release 12.2(33)SCB5
There are no modified software features in Cisco IOS Release 12.2(33)SCB5.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-17
Chapter 1
Introduction
New and Changed Information
New Software Features in Cisco IOS Release 12.2(33)SCB4
This section describes the new cable software features in Cisco IOS Release 12.2(33)SCB4. Some
features may be new to Cisco IOS Release 12.2(33)SCB4 but were released in earlier Cisco IOS software
releases. Some features may have been released in earlier Cisco IOS software releases and have been
changed in Cisco IOS Release 12.2(33)SCB4. To determine if a feature is new or changed, see the feature
history table at the beginning of the feature module for that feature. Links to feature modules are
included below. If a feature listed below does not have a link to a feature module, that feature is
documented only in the release notes, and information about whether the feature is new or changed will
be available in the feature description provided below.
The show interface cable dsg downstream dcd command output is modified to display the DOCSIS
Set-top Gateway (DSG) Downstream Channel Descriptor (DCD) messages for all interfaces in the MAC
domain.
For more information, refer
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_18_show_d_to_show_i.html#wp1
148747
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 ranging response (RNG-RSP) MAC management
messages. The TLV Type 9 helps CMs to 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
Adding DSG Tunnel Group to a Subinterface
Cisco IOS Release 12.2(33)SCB4 introduces the option to add a DOCSIS Set-Top Gateway (DSG)
tunnel-group to a subinterface using the cable dsg tg command. After adding the DSG tunnel-group to
a subinterface using cable dsg tg command, appropriate IP Internet Group Management Protocol
(IGMP) static joins are created and forwarding of DSG traffic begins.
The cable dsg tg group-id command was introduced in this release.
The updated section in the 'Advanced Mode DOCSIS Set-Top Gateway 1.2 for the Cisco CMTS Routers'
feature guide is available at the following URL:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_docsis_gw12.html
Modified Software Features in Cisco IOS Release 12.2(33)SCB4
CM Steering Enhancement
In Cisco IOS Release 12.2(33)SCB, the CM would not come online if the CM attribute did not match
any channel attribute. In Cisco IOS Release 12.2(33)SCB4, if the legacy LB is configured on the channel
and if the CM attribute did not match any US channel in the same legacy LB group, the CM steering
feature enhancement allows the CMs to come online by skipping the CM steering check. However, the
US channel must meet the requirement of the CM US attribute masks if an LBG is not configured.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-18
Chapter 1
Introduction
New and Changed Information
For more information, refer to the CM Steering on the Cisco CMTS Routers at the following URL:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_cm_steer.html
New Software Features in Cisco IOS Release 12.2(33)SCB3
This section describes the new cable software features in Cisco IOS Release 12.2(33)SCB3. Some
features may be new to Cisco IOS Release 12.2(33)SCB3 but were released in earlier Cisco IOS software
releases. Some features may have been released in earlier Cisco IOS software releases and have been
changed in Cisco IOS Release 12.2(33)SCB3. To determine if a feature is new or changed, see the feature
history table at the beginning of the feature module for that feature. Links to feature modules are
included below. If a feature listed below does not have a link to a feature module, that feature is
documented only in the release notes, and information about whether the feature is new or changed will
be available in the feature description provided below.
M-CMTS Enhancement
As part of M-CMTS enhancement, the following commands are modified in Cisco IOS Release
12.2(33)SCB3. The commands are upgraded to provide better display of the route processor service flow
and queue information.
•
show cr10k-rp
•
show pxf cpu queue
For more information on these commands, see the Cisco IOS CMTS Cable Command Reference guide at
the following URL:
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
Modified Software Features in Cisco IOS Release 12.2(33)SCB3
There are no modified features in Cisco IOS Release 12.2(33)SCB3.
New Software Features in Cisco IOS Release 12.2(33)SCB2
There are no new software features in Cisco IOS Release 12.2(33)SCB2.
Modified Software Features in Cisco IOS Release 12.2(33)SCB2
There are no modified features in Cisco IOS Release 12.2(33)SCB2.
New Software Features in Cisco IOS Release 12.2(33)SCB1
This section describes the new cable software features in Cisco IOS Release 12.2(33)SCB1. Some
features may be new to Cisco IOS Release 12.2(33)SCB1 but were released in earlier Cisco IOS software
releases. Some features may have been released in earlier Cisco IOS software releases and have been
changed in Cisco IOS Release 12.2(33)SCB1. To determine if a feature is new or changed, see the feature
history table at the beginning of the feature module for that feature. Links to feature modules are
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-19
Chapter 1
Introduction
New and Changed Information
included below. If a feature listed below does not have a link to a feature module, that feature is
documented only in the release notes, and information about whether the feature is new or changed will
be available in the feature description provided below.
DOCSIS 3.0 Downstream Peak Traffic Rate TLV Support for ERBA
The peak-rate option of the cable ds-max-burst command allows you to specify the peak rate an
ERBA-enabled service flow can use. The peak-rate value is a global value and is applied to all service
flows created after the configuration of the cable ds-max-burst command. The default value of the
peak-rate is zero.
If the DOCSIS 3.0 TLV 25.27 is specified for a service flow, the peak-rate value is set as the TLV value.
However, if ERBA is not turned on for a service flow, the peak-rate value is ignored.
The peak-rate value can also be configured through cable service class command which forms part of
the service class template. During modem registration or Dynamic Service Addition (DSA) operation,
the service class name TLV 25.4 is sent to create the static or dynamic downstream service flow that
matches the service class template. These downstream service flows are created with a specific
peak-rate. If the peak-rate is not specified, then the value specified by the cable ds-max-burst command
is used.
If a service flow has both service class and TLV 25.27 defined peak-rate, then the peak-rate value
specified in the TLV is used.
The Cisco IOS Release 12.2(33) SCB1 modifies the cable service class command with the addition of
peak-rate to set value greater than max-rate.
For more information about this feature, see the DOCSIS 1.1 for the Cisco CMTS Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_docsis11.html
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 Cisco uBR10012 universal broadband
routers:
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#wp1011194
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_cable_u.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-20
Chapter 1
Introduction
New and Changed Information
RCC Spanning Across Multiple SPAs for VDOC Broadcast
The VDOC broadcast feature requires modems to be tuned to RF-spanned channels carrying video
streams. The RF-spanned channels originate from a SPA other than the SPA hosting the primary bonding
group assigned to the cable modem.
For detailed information about this feature, see the IGMP-Triggered VDOC Broadcast Support on the
Cisco CMTS Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/VDOC_dbc_feature.html
SAMIS CLC-RP Traffic Throttling
The SAMIS CLC-RP traffic throttling feature limits or throttles the data collection between the cable
line card and the route processor. This functionality is achieved using the new cable metering
data-per-session command. This feature also reduces the congestion in the Broadband Processing
Engine (BPE) due to the SAMIS data collection from CLC to RP.
The following commands are new or modified:
•
cable metering data-per-session
•
show cable metering verbose
•
cable metering destination
For more information about these commands, see the Cisco IOS CMTS Cable Command Reference guide
at the following URL:
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
Service Disruption during ISSU
PacketCable Voice and UGS Service Flows
The Unsolicited Grant Service (UGS) voice flow based voice service outage time during the ISSU
process is provided in Table 6.
Table 6
Performance data for PacketCable Voice and UGS Service Flows
Service
Outage Time Lesser Than or Equal To
Execution of issu runversion command
2 seconds
Execution of ISSU linecard related commands
2 seconds
Execution of SIP-600 & Wideband SPA MDR,
specifically during a major MDR event.
2 minutes
Execution of 2XDS-SIP jacket card and SPA
reload during a major MDR event.
2 minutes
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-21
Chapter 1
Introduction
New and Changed Information
Other Service Flows
The non UGS service flows (except UGS) exhibit a higher service impact and are provided in Table 7.
Table 7
Performance data for non UGS Service Flows
Service
Outage Time Lesser Than or Equal To
Execution of issu runversion command
4 seconds
Execution of ISSU linecard related commands
4 seconds
Execution of SIP-600 & Wideband SPA MDR,
specifically during a major MDR event.
2 minutes
Execution of 2XDS-SIP jacket card and SPA
reload during a major MDR event.
2 minutes
Modified Software Features in Cisco IOS Release 12.2(33)SCB1
There are no modified features in Cisco IOS Release 12.2(33)SCB1.
New Software Features in Cisco IOS Release 12.2(33)SCB
This section describes the new cable software features in Cisco IOS Release 12.2(33)SCB. Some
features may be new to Cisco IOS Release 12.2(33)SCB but were released in earlier Cisco IOS software
releases. Some features may have been released in earlier Cisco IOS software releases and have been
changed in Cisco IOS Release 12.2(33)SCB. To determine if a feature is new or changed, see the feature
history table at the beginning of the feature module for that feature. Links to feature modules are
included below. If a feature listed below does not have a link to a feature module, that feature is
documented only in the release notes, and information about whether the feature is new or changed will
be available in the feature description provided below.
DOCSIS OSSI Event Messages
The DOCSIS OSSI Event Messages feature describes the error messages for events as required by the
DOCSIS 2.0 specifications.
The DOCSIS 2.0 specifications require the CMTS to generate a set of messages for DOCSIS-specific
events. These event messages must conform to the requirements of Section 7.4.2.2.2, SYSLOG Message
Format, in the DOCSIS 2.0 Operations Support System Interface (OSSI) Specification
(CM-SP-OSSIv2.0-I09-050812). The event message format is as follows:
%System_Error_Message: <Level>CMTS[DOCSIS]:<Event ID> Message Text
For detailed information on the components contained in the event message format, refer to the DOCSIS
1.1 Event Messages section of the Cisco IOS CMTS Cable System Messages Guide.
The event messages are implemented as part of the 0SS 18.2 specifications for the following
processes:
•
Dynamic Channel Change
•
Upstream Channel Change
•
Ranging/Registration errors implementation
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-22
Chapter 1
Introduction
New and Changed Information
•
Dynamic Service flows
•
BPI/AUTH-FSM
The processes listed above have further set-off sub-processes for which events are generated. For the full
list of event messages supported on the Cisco uBR10012 router, refer to the Cisco IOS CMTS Cable
System Messages Guide at the following location:
http://www.cisco.com/en/US/docs/cable/cmts/system/message/uberrmes.html
Bypass the 24 Hour Timer for WB CM Use of Failed RF Channels
When the CM sends a request to the CMTS for bonded service, the CMTS assigns the best available
bonding group that is compatible with the CM. The CM then attempts to acquire the non-primary DS RF
channels that are members of that bonding group. If the CM is unable to acquire one or more of the
channels, it returns an error code causing the CMTS to mark all of the assigned RF channels as
unacceptable for that CM. In prior versions, the channels so marked could not be reassigned to the same
CM for up to 24 hours.
The new feature has removed the 24 hour timer required to clear these channels. Once the CM
successfully completes registration, the list of failed RF channels for that CM is cleared. If the RF
impairment has been eliminated when the CM re-registers, that channel can be reused immediately.
There are no new or modified commands for this feature.
For more information, see the Wideband Modem Resiliency feature guide at the following URL:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_wm_resiliency.html
CM Steering
The Cable Modem (CM) Steering feature helps to redirect or steer CMs to multiple Cable Modem
Termination Systems (CMTS) using downstream frequency overrides. A configurable string is used to
bond the CM to the proper CMTS. Once the bonding is done, you can redirect or steer the CMs to one
or more CMTSs using downstream frequency overrides.
The following commands are new or modified:
•
cable service type
•
cable service type ds-frequency
•
cable upstream attribute-mask
•
clear cable modem attribute-masks
•
clear cable modem service-type
•
show cable modem service-type
For detailed information about this feature, see the CM Steering on the Cisco CMTS Routers document
at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_cm_steer.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-23
Chapter 1
Introduction
New and Changed Information
CMTS IPDR/SP
The Cisco universal broadband router supports the Internet Protocol Detail Record (IPDR) Streaming
Protocol feature that enables efficient and reliable delivery of high volume data records from the service
elements to any systems, such as mediation systems and BSS/OSS. IPDR Streaming Protocol is designed
to address critical issues such as the need for a reliable, fast, efficient and flexible export process of high
volume data records such as billing, performance, and diagnostic data.
The IPDR/SP process communicates with the IPDR collectors. The architecture supports primary and
secondary collectors for failover purposes. At any time, data is sent only to one collector. If the exporter
to primary collector connection failed due to any reason, the data is sent to a secondary collector.
Depending on the network configuration, you can have multiple primary collectors designed for different
types of data. For example, there may be a billing collector, a diagnostic collector, and so on.
The following commands are new in Cisco IOS Release 12.2(33)SCB.
•
ipdr session
•
ipdr collector
•
ipdr associate
•
ipdr template
•
ipdr exporter start
•
ipdr session (global configuration)
•
show ipdr session
•
show ipdr session template
•
show ipdr session collector
•
show ipdr exporter
•
show ipdr collector
For more information on the IPDR, see the Configuring IPDR Streaming Protocol on the CMTS Router
document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ipdr_feature.html
DOCSIS 3.0 Downstream Bonding for Bronze Certification
The DOCSIS 3.0 Downstream Bonding for Bronze Certification feature enables high-speed broadband
access (100 Mbps) and helps cable operators offer more bandwidth-intensive services by adding one or
more additional downstream quadrature amplitude modulation (QAM) channels to the standard
broadband DOCSIS system. This new set of downstream channels is grouped into one larger channel,
known as a bonded channel.
Channel bonding combines several radio frequency (RF) channels into one virtual channel. Data rates in
this virtual channel range from hundreds of megabits to potentially gigabits per second creating more
available bandwidth in the network.
The following commands are new or modified:
•
cable rcc-template
•
cable rcp-control verbose
•
rcp-id
•
receive-module
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-24
Chapter 1
Introduction
New and Changed Information
•
receive-channel
•
show cable mac-domain rcc
•
show interface cable service-flow
•
show cable modem
For more information about this feature, see the DOCSIS 3.0 Downstream Utility for Bronze
Certification document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_ds_bonding.html
DOCSIS 3.0 Multicast Support
Cisco IOS Release 12.2(33)SCB introduces multicast improvements as mandated by DOCSIS 3.0
specifications on the Cisco CMTS routers. DOCSIS 3.0 multicast support improves bandwidth
efficiency and allows service providers to offer differentiated quality of service for different types of
traffic.
Using the multicast improvements, the cable operators can seamlessly deliver advanced services like
Video On Demand (VoD), IPTV, and facilitate interactive video and audio and data services.
The following commands are new or modified:
•
cable multicast authorization
•
cable multicast authorization profile
•
cable multicast group-qos
•
cable service class
•
match rule
•
show cable multicast authorization
•
show cable multicast db
•
show cable multicast dsid
•
show cable multicast qos
For detailed information about this feature, see the DOCSIS 3.0 Multicast Support on the CMTS Routers
document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_d30_mcast_support.html
DOCSIS WFQ Scheduler
The Data Over Cable Service Interface Specification (DOCSIS) Weighted Fair Queuing (WFQ)
Scheduler is an output packet scheduler that provides output scheduling services on both WAN uplink
interfaces and DOCSIS downstream interfaces.
The DOCSIS WFQ scheduling engine is used to provide output packet scheduling services including
absolute priority queuing, weighted fair queuing, minimum rate guarantee, shaping, and DOCSIS
bonding group dynamic bandwidth sharing on the Cisco uBR10012 universal broadband router. It
replaces the existing Versatile Traffic Management System (VTMS) scheduler.
For detailed information about this feature, see the DOCSIS WFQ Scheduler on the Cisco CMTS Routers
document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_docsis_wfq_sch.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-25
Chapter 1
Introduction
New and Changed Information
Dynamic Bandwidth Sharing
Dynamic bandwidth sharing (DBS) is the dynamic allocation of bandwidth for wideband (WB) and
modular cable (MC) interfaces sharing the same downstream channel. The bandwidth available to each
WB, MC, or narrowband channel is not a fixed value (it depends on the configuration and the traffic load
on the WB or MC).
DBS is achieved using a new type of modality called a link queue. Link queues represent a specific share
of bandwidth on a particular channel. Link queues are only used to calculate the effective bandwidth of
a channel, and such link queues are activated and deactivated according to the state of activity on a
specific channel. DBS and static bandwidth allocations are configured at the WB or MC interface level.
By default, bandwidth for a WB or MC channel is statically allocated. When DBS is enabled on an
interface, the static bandwidth percentage is converted to a committed information rate (CIR) value for
the corresponding link queue. The interface CIR value represents the guaranteed portion of the interface
bandwidth and is used for admission control of the service flows with a minimum reserved rate. When
DBS is enabled, you can also specify the remaining ratio value of the excess bandwidth for the link
queue. If DBS is enabled and no bandwidth percentage is specified, no bandwidth is reserved for the WB
or MC interface and the interface is effectively in the protocol down state where link queues are not
created.
Dynamic bandwidth sharing does not preclude static bandwidth configuration. If a static portion of
bandwidth is configured on any radio frequency (RF) channel that one or more DBS-enabled channel
utilizes, that portion is subtracted from the RF link CIR. Therefore, such a portion is always reserved
and is not available to dynamic WB or MC interfaces. The DBS feature continues working across line
card and performance routing engine (PRE) switchovers with no loss of functionality.
For more information on the DBS, see the Dynamic Bandwidth Sharing on the Cisco CMTS Router
document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_dyn_bw_sharing.html
The following commands are new in Cisco IOS Release 12.3(23)BC1 and integrated into Cisco IOS
Release 12.2(33)SCB:
•
cable dynamic-bw-sharing
•
debug cr10k-rp dbs-blt
•
show pxf cable controller
The following commands are modified in Cisco IOS Release 12.3(23)BC1 and integrated into Cisco IOS
Release 12.2(33)SCB:
•
cable rf-bandwidth-percent
•
cable rf-channel
•
show pxf cpu queue
For a detailed description of the commands, see the Cisco IOS CMTS Cable Command Reference.
Dynamic Service Transaction ID Allocation
DOCSIS 2.0 mandates unique Transaction IDs (TAIDs) across transactions. The TAIDs must be unique
and not incremented. The TAIDs are assigned by the senders and sometimes the TAID timeout is
mismatched between senders and receivers. This affects the uniqueness of the TAID.
A TAID can be reused when the sender finishes a transaction. Similarly, DOCSIS allows the receiver to
identify a transaction by TAID without the SFID. Problems arise in DSD transaction and DSA/DSC
interrupted transactions, when these two requirements are combined.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-26
Chapter 1
Introduction
New and Changed Information
The uniqueness of TAID must be ensured to resolve the interoperability issue. This is done by making
the CMTS wait until T10 to reuse the same TAID. A new TAID allocation algorithm is used to fulfill this
requirement.
It creates a TAID pool to replace the existing 16-bit counter. This TAID pool is monitored by timers to
track the TAID expiration. A flag is assigned to each TAID in the pool to indicate its availability. When
new TAID is requested, the dynamic service process checks the availability of the TAID. If the TAID is
available, it is allocated to the new service flow, or else the request is rejected.
Once the TAID is allocated, the timer starts with T10 expiration time and the TAID flag is set to FALSE
to indicate the unavailability of the TAID. The dynamic service process keeps track of the timer. When
the time expires, the timer stops and the flag is set to TRUE to indicate the availability of the TAID.
The TAID pool is allocated and initialized at the process initialization. All timers associated with the
TAIDs are added as leaf timers to the process parent timer.
For detailed information about this feature, see the Configuring Video over DOCSIS Broadcast on the
Cisco CMTS Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_pktcable_mm.html
IGMP-Triggered VDOC Broadcast Support
The Cisco universal broadband router supports the Video over DOCSIS (VDOC) feature enabling
multiple system operators (MSOs) to broadcast video content on RF-spanned downstream signals.
The VDOC feature facilitates broadcasting video over DOCSIS (Data Over Cable Service Interface
Specification). Video streams are broadcast to one or more downstream RF channels using static
multicast. Depending on the video stream selected for viewing by the IP set-top box, the multi-tuner
cable modem is tuned to the appropriate RF channel carrying the specific video stream.
For more information on the VDOC, see the Configuring Video over DOCSIS Broadcast on the Cisco
CMTS Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/VDOC_dbc_feature.html
IP SLAs—Random Scheduler
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_multi_scheduler.html
IP SLAs—Additional Threshold Traps
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/command/reference/sla_book.html
IP SLAs—Proactive Threshold Monitoring of IP SLAs Operations
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_threshold_mon.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-27
Chapter 1
New and Changed Information
IP SLAs—Analyzing IP Service Levels Using the UDP Jitter Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_udp_jitter.html
IP SLAs—Analyzing VoIP Service Levels Using the UDP Jitter Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_udp_jitter_voip.html
IP SLAs—Analyzing IP Service Levels Using the TCP Connect Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_tcp.html
IP SLAs—Scheduler
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_overview.html
IP SLAs—Proactive Threshold Monitoring of IP SLAs Operations
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_threshold_mon.html
IP SLAs—One Way Measurement
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_overview.html
IP SLAs—Multioperation Scheduling of IP SLAs Operations
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_multi_scheduler.html
IP SLAs—MPLS VPN Awareness
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_overview.html
IP SLAs—Analyzing IP Service Levels Using the ICMP Path Echo Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_icmp_pathecho.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-28
Introduction
Chapter 1
Introduction
New and Changed Information
IP SLAs—Analyzing IP Service Levels Using the HTTP Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_http.html
IP SLAs—Analyzing IP Service levels Using the FTP Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_ftp.html
IP SLAs—Analyzing IP Service Levels Using the DNS Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_dns.html
IP SLAs—Distribution of Statistics
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_dns.html
IP SLAs—Analyzing IP Service Levels Using the DHCP Operation
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/sla_dhcp.html
IP SLAs—CLI Phase 3
For detailed information about this feature, see the following Cisco document:
http://www.cisco.com/en/US/docs/ios/ipsla/command/reference/sla_book.html
ISSU—In Service Software Upgrade
The In Service Software Upgrade (ISSU) process allows Cisco IOS software to be updated while packet
forwarding continues. In most networks, planned software upgrades are a significant cause of downtime.
ISSU increases network availability and reduces downtime caused by planned software upgrades.
The Cisco uBR10012 software upgrade consists of the following process changes.
•
PRE ISSU through PRE Stateful Switchover (SSO.)
•
Redundant UBR10-MC5X20H line card ISSU via line card switchover.
•
Redundant DTCC card upgrade with sequential reload.
•
Non-redundant Wideband SPA with the Cisco SIP-600 jacket card ISSU through a Minimum
Disruptive Restart (MDR) process.
•
XDS-SIP jacket card upgrade through reload.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-29
Chapter 1
Introduction
New and Changed Information
The ISSU process is performed during normal PRE processor module CPU utilization and line card CPU
utilization conditions. The ISSU process is not recommended when the PRE processor module CPU
utilization is constantly higher than 80% or line card CPU utilization is higher than 90%.
Note
High CPU consumption processes (such as SNMP polling) should be avoided during the ISSU
process.
The following commands are used to check the PRE processor module CPU utilization and line card
CPU utilization respectively prior to start of the ISSU process:
•
show processes cpu
•
show controllers cable [proc-cpu]
For detailed information about the ISSU feature and process, see
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_issu.html
For a detailed description of the commands please refer the Cisco IOS CMTS Cable Command
Reference.
Line Card High Availability (HA) Support for WB Cable Modems
Wideband cable modems remain online whenever there is a failure or switchover of a 520 MD host line
card, 520 guardian line card, 520 host, or 520 guardian on the same line card, or a performance routing
engine (PRE).
There are no new or modified commands for this feature.
For more information, see the Configuring the Cisco uBR10-MC5X20S Cable Interface Line Card
feature guide at the following URL:
http://www.cisco.com/en/US/docs/interfaces_modules/cable/broadband_processing_engines/ubr10_mc
5x20s_u_h/feature/guide/mc5x20s.html
Load Balancing Prohibition Based on Group Policy ID
Effective with Cisco IOS Release 12.2(33)SCB, and later releases, load balancing is enhanced to use
rules and policies to decide on moving the CMs within their LB groups. These policies are created on
the CMTS and chosen on a per-CM basis using TLV portion (43.1, Policy ID) of REG-REQ. These
policies prohibit a modem from being moved or restricted.
A policy contains a set of rules. When it is defined by multiple rules, all rules apply in combinations. A
rule can be defined as "enabled", "disabled", or "disabled during time period."
Each rule can be used by more than one policy. When it is defined by multiple rules, all rules apply in
combinations. Each rule helps to prohibit load balancing using a particular CM and to prohibit load
balancing using a particular CM during certain times of the day.
For detailed information about this feature, see the Load Balancing and Dynamic Channel Change on
the Cisco CMTS Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_load-bal_dcc.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-30
Chapter 1
Introduction
New and Changed Information
MxN MAC Domain DS Load Balancing
Prior to the introduction of this new feature, load balancing configuration using the cable load-balance
group policy (us-groups-across-ds) command only considered upstream (US) load balancing across
different downstream (DS) channels. This was sufficient if an US channel was not associated to more
than one DS channel. However, for an MxN MAC domain, it is possible to have one US channel
associated to multiple DS channels. In this case, it is necessary to further balance the DS load, once the
US load is sufficiently balanced.
With the new feature, once the us-groups-across-ds policy is configured, CMTS attempts to balance the
DS load on top of the balanced US load and among DS channels associated to the same US. The method
and policy used for DS load balancing are based on the configuration in the DS load balancing group
associated to the corresponding DS channels.
There are no new or modified commands for this feature.
For more information, see the Load Balancing and Dynamic Channel Change on the Cisco CMTS
Routers feature guide at the following URL:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_load-bal_dcc.html
Onboard Failure Logging (OBFL)
Platforms: Cisco uBR10012 platform for PRE4 and Cisco 10000 Series SIP-600
The Onboard Failure Logging (OBFL) feature enables storage and collection of critical failure
information in the nonvolatile memory of an Field Replaceable Unit (FRU), such as a Route Processor
(RP) or Line Card. The Cisco 10000 series router supports OBFL on the PRE4 and the SPA Interface
Processor (SIP). This feature is supported on the Cisco uBR10012 router with the PRE4 and SIP-600.
This is supported for the PRE4 and SIP-600 only.
The OBFL stored data assists in understanding and debugging field failures upon Return Material
Authorization (RMA) of a RP or line card at repair and failure analysis sites.
OBFL records operating temperatures, hardware uptime, interrupts and any other important events that
assist board diagnosis in case of hardware failures.
For more information on the feature, see the Onboard Failure Logging feature guide located at the
following URL:
http://www.cisco.com/en/US/docs/interfaces_modules/cable/performance_routing_engine/installation/
guide/pre5096.html
PXF Divert Rate Limit Enhancements
The Parallel eXpress Forwarding (PXF) Divert Rate Limit (DRL) Enhancement feature aims to prevent
congestion of the forwarding processor (FP) to the Route Processor (RP) interface by identifying and
rate-limiting entities that would otherwise cause congestion. Congestion of FP-to-RP interface can be
caused deliberately by Denial-of-Service (DoS) attacks directed at the CMTS, or inadvertently by faulty
external hardware.
The PXF DRL Enhancement feature applies to both cable and WAN interfaces.
The following commands are new or modified:
•
cable divert-rate-limit
•
service divert-rate-limit ip
•
service divert-rate-limit non-ip
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-31
Chapter 1
Introduction
New and Changed Information
•
service divert-rate-limit trusted-site
•
clear pxf statistics drl cable-wan-ip
•
clear pxf statistics drl wan-non-ip
•
show pxf cpu statistics
•
show pxf cpu drl-trusted-sites
For detailed information about this feature, see the PXF Divert Rate Limit Enhancement on the Cisco
CMTS Routers document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_pxf_drl_limit_enhance.html
RSVP-Based Video on Demand Support over DOCSIS
The Cisco universal broadband router supports Video on Demand over DOCSIS (Data Over Cable
Service Interface Specification) services using RSVP (Resource ReSerVation Protocol) bandwidth
request from the VoD server. The RSVP protocol is used by the Cable Modem Termination System
(CMTS) to request video data from the network for specific application data flows.
The RSVP protocol is used by a host to request specific qualities of service (QoS) from the network for
particular application data streams or flows. RSVP is used by the CMTS to deliver video requests along
the data path of the flows and maintains the state to provide the requested service. RSVP requests will
generally result in resources being reserved in each node along the data path.
The following commands are new in Cisco IOS Release 12.2(33)SCB.
•
cable rsvp default-scn
•
show cable rsvp flow-db
For more information on the RSVP, please see
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/VDOC_rsvp_feature.html
Subscriber Management Packet Filtering for DOCSIS 2.0
The Cisco universal broadband router supports management of data packet filtering based on the
subscriber's preferences and criteria. Packet filtering enhances security to the cable network by allowing
only the specific packets to flow to the Customer Premise Equipment (CPE) while dropping the
unwanted data packets from the cable network.
A filter group specifies what filters are applied to the packets going to or coming from each specific CM
or CPE device. It defines the rules or criteria to filter or drop a packet. Every packet that has to be filtered
can either be accepted to send or filtered to be dropped. The criteria to filter a packet depends on the
subscriber's preferences. The filter group can be applied to different subscriber management groups.
The following commands are new or modified in Cisco IOS Release 12.2(33)SCB.
•
cable filter group
•
cable submgmt default filter-group
For more information on the subscriber management packet filtering, please see
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/SMPF_feature.html
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-32
Chapter 1
Introduction
New and Changed Information
Subscriber ID Support for Packetcable
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-subscriber ID used in global
configuration mode. For more information, see the Packetcable feature in the Cisco IOS CMTS Cable
Command Reference Guide at
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_pktcable_mm.html
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 and integrated into Cisco
IOS Release 12.2(33)SCB with the following support:
•
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
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-33
Chapter 1
Introduction
New and Changed Information
•
ccqmCmtsEnfRuleWkndAvgRate
•
ccqmCmtsEnfRuleWkndSampleRate
•
ccqmCmtsEnfRuleWkndFirstPeakTime
•
ccqmCmtsEnfRuleWkndFirstDuration
•
ccqmCmtsEnfRuleWkndFirstAvgRate
•
ccqmCmtsEnfRuleWkndSecondPeakTime
•
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
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-34
Chapter 1
Introduction
New and Changed Information
Voice Support on WB Modems
CMTS supports voice services on voice-enabled wideband (WB) cable modems. Committed information
rate (CIR) downstream service flows on WB interfaces are supported. You can reserve up to 90% of the
wideband interface bandwidth. If multiple MAC domains (MDs) are sharing a WB interface, the
available link rate is distributed evenly between all MDs that share the WB interface. If the MDs that
share the WB interface are on the same line card, they share the CIR pool.
To display the reserved and available bandwidth, you can use the show-module bay all association
wideband command. To display the reserved and available bandwidth for wideband interfaces, you can
use the show interface wideband-cable command. For more information, see the Cisco IOS CMTS
Cable Command Reference Guide.
There are no new commands introduced for this feature. However, the user must first enable packetcable
or multimedia packetcable to enable the voice support feature.
For more information, see the Cisco DOCSIS 3.0 Downstream Solution Design and Implementation
Guide at the following URL:
http://www.cisco.com/en/US/docs/cable/cmts/wideband/solution/guide/release_2.0/3arch.html
VoIP SFID Mapping
The introduction of WB media terminal adapters (MTAs) and the resequencing delays with the
downstream (DS) bonded traffic are pushing voice traffic towards non-bonded channels.
As the WB MTA uses the cable line card (CLC) DS interface as the primary interface, it can protect voice
traffic from edge quadrature amplitude modulation (e-QAM) and shared port adapter (SPA) failures. It
also helps in leveraging the CLC redundancy feature to protect voice calls.
The voice-over-IP (VoIP) Service Flow ID (SFID) Mapping feature leverages Data-over-Cable Service
Interface Specifications (DOCSIS) 3.0 Service Flow (SF) Attribute-based assignment, which allows
forwarding to Bonding groups or to single channel on a per-SF basis.
The customer premises equipment (CPE) constructs DSX (Dynamic-service DOCSIS mac-management)
messages that does not conform to DOCSIS 3.0 specifications and does not includes the SF Attribute
parameters. However, the Cable Modem Termination System (CMTS) should control these factors and
whenever voice calls are initiated; the CMTS must add SF Attributes, configured by the user, to the DSX
messages.
For more information, see the Service Flow Mapping to MPLS-VPN on the Cisco CMTS Routers feature
guide at the following URL:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/cmts_svcflw_map_vpn.html
Wideband Modem Resiliency
The Wideband Modem Resiliency feature enables the Cisco uBR10012 router to interact with DOCSIS
3.0-compliant cable modems in order to provide the best possible service in the event of non-primary
radio frequency channel disruptions such as loss of quadrature amplitude modulation (QAM), forward
error correction (FEC) locks, and MAC Domain Descriptor (MDD) time-outs. If a CM loses connectivity
to the CMTS on one or all of its non-primary RF channels, the CMTS does not force the CM to perform
a MAC reset and enables the CM to remain operational.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-35
Chapter 1
Introduction
MIBs
A DOCSIS 3.0-qualified CMTS transmits data to one or more DOCSIS 3.0-compliant cable modems
using multiple RF channels. For a CM, one of the RF channels is used as the primary RF channel, and
the rest of the channels are considered non-primary channels. The primary RF channel is defined to be
the downstream (DS) RF channel on which the CM receives DOCSIS MAC messages needed for
upstream timing and synchronization.
The following commands are new or modified:
•
cable rf-change-dampen-time
•
cable rf-change-trigger
•
cable cm-status enable
•
show interface rf-status
•
show cable rf-status
•
show cable modem wideband rcs-status
•
show cable modem summary wb-rf
•
clear cable modem cm-status
•
clear cable modem rcs-counts
•
clear cable rf-status
•
debug cable wbcmts resiliency
•
show cable flap-list wb-rf
For more information about this feature, see the Cisco feature document at:
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_wm_resiliency.html
Modified Software Features in Cisco IOS Release 12.2(33)SCB
There are no modified software features in Cisco IOS Release 12.2(33)SCB.
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 verifies that
your e-mail address is registered with Cisco.com. If the check is successful, account details with a new
random password is 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
For information about the MIBs supported by the Cisco universal broadband routers, see the Cisco
CMTS Universal Broadband Series Router MIB Specifications Guide.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-36
Chapter 1
Introduction
Limitations and Restrictions
New and Changed MIB Information in Cisco IOS Release 12.2(33)SCB
The Cisco universal broadband routers include or add support for the following MIBs in
Cisco IOS Release 12.2(33)SCB:
•
CLAB-TOPO-MIB
•
DOCS-DIAG-MIB
•
DOCS-DRF-MIB
•
DOCS-IF3-MIB
•
DOCS-IETF-CABLE-DEVICE-NOTIFICATION-MIB
•
DOCS-IETF-BPI2-MIB
•
DOCS-IETF-QOS-MIB
•
DOCS-IFEXT2-MIB
•
DOCS-QOS3-MIB
•
DOCS-TEST-MIB
Limitations and Restrictions
This section describes restrictions for the Cisco universal broadband routers in
Cisco IOS Release 12.2(33)SCB.
Unsupported Hardware
For a list of unsupported hardware, see the End-of-Life and End-of-Sale Notices at:
http://www.cisco.com/en/US/products/hw/cable/ps2209/prod_eol_notices_list.html
Software Feature Restrictions
This section describes other important guidelines or restrictions to consider when running Cisco IOS
Release 12.2SC that might not yet be documented in the supporting customer documentation.
DOCSIS
•
You cannot configure a US connector to more than one fiber node.
•
Multicast over DOCSIS L2VPN does not work for a DOCSIS 3.0-bonded cable modem (CM) when
DOCSIS L2VPN is provisioned on a DOCSIS 3.0-bonded CM and downstream multicast traffic is
sent over L2VPN. You can use a DOCSIS L2VPN classifier to classify multicast traffic on a
secondary DS service flow with SF attributes (TLV 25.31/32) specifying primary DS for the CM.
As a result, L2VPN multicast traffic uses the primary DS and L2VPN unicast traffic is forwarded
over the primary bonding group. The service flow attribute feature is available in Cisco IOS Release
12.2SCB.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-37
Chapter 1
Introduction
Limitations and Restrictions
DTI Card Configuration
The Cisco uBR10012 universal broadband router TCC card does not work as expected when the startup
configuration contains the configuration for a Cisco uBR10012 universal broadband router TCC+ card.
To fix this issue, use the no card slot/subslot 2cable-tccplus command and then configure the DTI card.
In-Service Software Upgrade (ISSU)
ISSU downgrade is not supported from Cisco IOS Release 12.2(33)SCB7 and later to all previous
12.2(33)SCB releases. Service disruption will be caused if you perform ISSU downgrade in these cases.
When an ISSU is performed from Cisco IOS Release 12.2(33)SCB4 (or previous releases) to Cisco IOS
Release 12.2(33)SCB5 (or later releases), the DTCC may implement an uncontrolled upgrade of the
firmware. This could disrupt service for a few minutes.
MIBs Restrictions
•
IP-MIB is implemented as read-only. Writing is not supported for ipv6IPForwarding or
ipv6IpDefaultHopLimit.
•
docsIf3MdCfgMcastDsidFwdEnabled object is implemented as read-only.
•
cdxBWQueueMaxDepth object sometimes reports a value out of range. The supported range is from
0 to 64, but the object sometimes returns a value of 128 when queried.
PacketCable
Payload Header Suppression (PHS) is not supported on wideband Embedded Media Terminal Adapters
(eMTAs) for dynamic downstream service flows.
PCMCIA
While performing an OIR of the PCMCIA disk on PRE2, the System Event Archive (SEA) application
and other applications such as IPDR write details to the PCMCIA disk on PRE2.
Before performing the OIR, the multiple system operator (MSO) must disable the write access to the
PCMCIA disk on PRE2 using the cable filesystem [enable|disable] command. For more information,
see the CSCsz77977.
PXF
Statistics for two different divert-rate limit (DRL) WAN-IP streams can momentarily overlap or collide
and produce statistics that are lower than expected.
Redundancy
•
Longer dropout times (about 6 seconds) can occur when you use the OIR method to trigger a cable
line card switchover on the Cisco uBR10012 router. To repair or maintain a cable line card and get
better switchover performance, use the redundancy linecard-group switchover command to
trigger the line card switchover instead.
•
Although the software does not prevent it, preconfiguring commands on a protect line card is not
supported.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-38
Chapter 1
Introduction
Important Notes
•
A dynamic service-flow for a PacketCable call is not deleted during a line card switchover.
•
Although the Cisco CMTS router is initially configured only for global N+1 redundancy, the show
running-configuration command displays both global and legacy interface-level Hot-Standby
Connection-to-Connection Protocol (HCCP) configuration when you change the redundancy mode
configuration from SSO to RPR mode. If you switch back to SSO mode, both redundancy
configurations are still shown.
•
In very rare circumstances, after an N+1 switchover, upstream traffic that is using Baseline Privacy
Interface (BPI) encryption is not received properly by the CMTS router. Input errors are logged on
the interface and the debug cable error command shows error messages similar to the following:
Cable5/1/4: Bad rx packet. JIB status code 0xA
The issue occurs on upstream channels that use a shared connector, where the other upstream
channel using the same shared connector is on another downstream and is shutdown. To workaround
this issue, you can activate the downstream and other upstream channel using the same shared
connector or temporarily unshare the upstream connector.
Wideband
If you configure a wideband interface with more than one MAC domain host sharing the committed
information rate (CIR) bandwidth, then the total wideband interface CIR bandwidth gets fragmented
among the MAC domain (MD) hosts sharing the wideband interface CIR bandwidth.
The WB interface CIR bandwidth can be shared by multiple MAC domain hosts, and these MAC domain
hosts could potentially be on the same or different cable line cards. As admission control for WB
interfaces occurs on cable line cards, the available CIR bandwidth gets partitioned and is given to the
MD hosts causing the bandwidth fragmentation. However if a typical service flow CIR is very small
compared to the total CIR of the wideband interface, then this fragmentation is not visible until the CIR
usage reaches very high levels close to the total interface bandwidth.
With certain bandwidth percentage configuration and traffic distribution, the overall link utilization of
dynamic bandwidth sharing (DBS) can be as low as 85 percent. For example, this can occur if the traffic
rate on a wideband interface is smaller than its configured bandwidth percentage, but the traffic rate on
a modular-cable interface is much larger than its bandwidth percentage. The packet drops occur only on
the modular-cable interface which has a larger amount of traffic than its bandwidth-percentage. To
workaround this scenario, configure a higher bandwidth percentage to the modular-cable interface,
which is larger than or equal to its expected or average traffic rate.
Important Notes
Note
This section describes important changes in various Cisco IOS Releases that differ from support found
in earlier software releases supported by the Cisco CMTS routers. This section is subject to change and
is not intended to cover all changes found in the software. There may be other changes within the
software that are not identified here, such as within the new and modified features. Closely read these
release notes in their entirety, as well as review the related caveats documents for more information.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-39
Chapter 1
Introduction
Important Notes
Table 8 identifies some of the key changes that you should consider when running
Cisco IOS Release 12.2(33)SCB.
Table 8
Important Changes in Cisco IOS Release 12.2SC
Change Description
Clearing Address Resolution Protocol (ARP) Entries
Using the clear arp command can take about 15 seconds to remove all ARP table
entries.
Reverse Path Forwarding
RPF on the Cisco uBR10012 router requires configuration of the ip verify
unicast source reachable-via rx allow-default command to properly interpret
default routes.
Scheduling Engine
The DOCSIS Weighted Fair Queuing (WFQ) Scheduler replaces the Versatile
Traffic Management System (VTMS) scheduler operation on the
Cisco uBR10012 router. For more information, see the feature documentation at:
Release Introduced
12.2(33)SCA
12.2(33)SCA
12.2(33)SCB
http://www.cisco.com/en/US/docs/ios/cable/configuration/guide/ubr_docsis_wf
q_sch.html
DOCSIS
12.2(33)SCB
CM-STATUS messages are enabled by default.
SPA Interface Processor/Shared Port Adapters
12.2(33)SCB
• New syntax is supported for the Cisco 10000 Series SIP-600 and shared port
adapters (SPAs). In many commands, the slot/subslot indexes have been
replaced by slot/bay.
•
FPD images that might be loaded on a Cisco Wideband SPA from
12.3(21)BC-based software images are incompatible with
Cisco IOS Release 12.2(33)SCA. The FPD images needed to support
Cisco IOS Release 12.2(33)SCB must be loaded on the Cisco Wideband SPA
for it to successfully load in Cisco IOS Release 12.2(33)SCB. If you should
attempt to bring up a Cisco Wideband SPA in Cisco IOS Release
12.2(33)SCB without successfully updating the compatible FPD image for
that release, the SPA fails to reload. If this is done with the Cisco Wideband
SPA installed in a Cisco Wideband SIP, the SIP begins to upgrade the SPA
and stops communicating with the PRE on the Cisco uBR10012 router. For
more information, see the “Upgrading Field-Programmable Devices”
chapter of the Cisco uBR10012 Universal Broadband Router SIP and SPA
Software Configuration Guide at:
http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapter
s/configuration/ubr10012/12.3_23_bc/10fpd.html
Spatial Reuse Protocol (SRP)
12.2(33)SCB
The Spatial Reuse Protocol (SRP) for the Cisco uBR10012 OC-48 line card is not
supported.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-40
Chapter 1
Introduction
Documentation Updates
Documentation Updates
This section describes important topics that might not be available in the customer documentation.
Command-Line Interface Changes and Notes
The following command-line interface (CLI) changes in Cisco IOS Release 12.2(33)SCB may not be
available in the customer documentation:
•
clear arp—The clear arp command has been modified to issue a prompt to the router console
requesting confirmation of execution of the command due to potentially serious impact to CMTS
router performance. The following is an example of the console prompt:
Router# clear arp
You are about to delete all ARP cache entries!
Severe impact on CMTS performance and temporary outages may result.
Consider 'clear ip arp' instead. Continue? (yes/[no]): no
•
show cable modem primary-channel—The word “local’ is shown in the Downstream RFID output
field to indicate that the Cisco uBR10-MC5X20S/U/H local downstream is being used as a primary
channel.
•
show controllers modular-cable—This command will not provide crash dump information for the
Cisco 10000 series SIP-600. Use the show diag 1/0 crashdump command to obtain this information
for the Cisco 10000 Series SIP-600.
•
show hccp detail—The output for this command has been modified to add “CMTS interface
pre-critical config.”
•
show hw-module bay counters rf-channel—The output for this command has been modified to
include RF channel frame rate “MPEG bps” and “MPEG Mbps” fields.
•
show policy-map interface cable output class—The ‘pkts output” field is always 0 even when
packets are in the queue.
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional
information, 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
Subscribe to the What’s New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed
and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free
service and Cisco currently supports RSS version 2.0.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-41
Chapter 1
Obtaining Documentation and Submitting a Service Request
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
1-42
Introduction
CH A P T E R
2
Caveat List for Cisco IOS Release 12.2(33)SCB
This chapter describes open and resolved severity 1 and 2 caveats and select severity 3 caveats:
•
The “Open Caveats” sections list open caveats that apply to the current release and may apply to
previous releases. A caveat that is open for a prior release and is still unresolved applies to all future
releases until it is resolved.
•
The “Resolved Caveats” sections list caveats resolved in a specific release, but open in previous
releases.
The bug IDs are sorted alphanumerically.
Note
The Caveats section includes the bug ID and a short description of the bug. For details on the symptoms,
conditions, and workaround for a specific caveat you must use the Bug Search Tool.
Cisco Bug Search
Cisco Bug Search Tool (BST), the online successor to Bug Toolkit, is designed to improve effectiveness
in network risk management and device troubleshooting. You can search for bugs based on product,
release, and keyword, and aggregates key data such as bug details, product, and version. For more details
on the tool, see the help page located at http://www.cisco.com/web/applicat/cbsshelp/help.html.
Open Caveats—Cisco IOS Release 12.2(33)SCB11
Bug ID
Description
CSCsw78972
The MAC Domain Descriptor (MDD) change message is getting generated on all
RF channels.
CSCsx46105
Gigabit Ethernet channel is not working with 802.1q subinterfaces.
CSCsx49779
A modem in w-online state comes online after the line card reset.
CSCsx72877
Tracebacks and Inter-Process Communication (IPC) error messages are appearing
in CMTS loaded with Cisco IOS Release 12.2(33)SCB1.
CSCsy14569
Memory leak occurs after deleting subinterface.
CSCsy16511
Re-ordering of modulation profile rates are not working after changing modulation
profiles on an upstream.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-1
Chapter 2
Bug ID
Description
CSCsy21280
Cisco Parallel eXpress Forwarding (PXF) forwards traffic up to 300 Mbps to route
processor (RP).
CSCsy23149
The Cisco uBR10012 router displays wrong slot numbers in MIB.
CSCsy93204
The cmts walk and snmp walk commands on the Address Resolution Protocol
(ARP) table results in high CPU utilization.
CSCsz24175
The uBR10012 router repeatedly generates the “%UBR10000-6-MAP_UPSTREAM_BW_ALLOCATION” syslog message.
CSCsz34637
The show pxf cpu queue interface command has no filtering option to display
non-zero length or drop count.
CSCsz36328
Cable modems remain in online(pk) and expired states after cable privacy
mandatory command is executed.
CSCsz37891
The Cisco uBR10012 router crashed because it ran out of unfragmented memory.
CSCsz43764
Wideband SIP crashes after running show controller modular command.
CSCsz56522
Potential wideband SPA Index leak is observed during the line card switchover.
CSCsz63011
Cable metering traps are not getting generated for streaming mode.
CSCsz67716
The 'Gate Report State' counter of the show packetcable cms verbose command
output is not getting incremented for PacketCable MultiMedia (PCMM) policy
servers.
CSCta58106
Non-default service flows and downstream service identifier (DSID) entries are
created when default multicast service flow fails.
CSCta68834
DOCSIS Setup Gateway (DSG) service class name change deletes multicast
quality of service (MQoS).
CSCta76326
Leak occurs in multicast static index after a line card switchover.
CSCta88850
Multicast session disappears after changing DSG tunnel service class.
CSCtb30957
The PRE crashes when multiple users issue the test hccp rfswitch relay command
in quick succession.
CSCtb62538
The no cable metering command reloads the standby.
CSCtb68175
High CPU usage in the Cisco uBR10-MC5X20U line card after bootup.
CSCtb74904
The service flow counter displays wrong values on the Cisco uBR10012 router
after a PRE module switchover.
CSCtb79237
No system log or SNMP trap gets generated when COPS process, that is used for
packetcable, fails.
CSCtc34111
Cable modems are coming NB-online instead of w-online.
CSCtc44487
Router crashes when a Cisco UBR-MC20X20V line card is added or removed from
the redundancy configuration.
CSCtc65910
A header buffer memory leak may be observed on Cisco CMTS.
CSCtd77576
High CPU utilization in Cisco uBR10-MC5X20U line card for N+1 setup.
CSCte84191
There is a mismatch of the BPI index between the cable line card and the remote
SPA when a redundancy is not configured on the line card and the guardian line
card is rebooted.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-2
Caveat List for Cisco IOS Release 12.2(33)SCB
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Bug ID
Description
CSCte91760
Simulating an intermediate session routing (ISR) watchdog using a busy-loop
delay in an ISR, results in an incorrect traceback. Further, an infinite loop in the
ISR results in no ISR watchdog functionality at all.
CSCtf04817
A cable line card crashes when the debug cable mac-protocol command and
dynamic channel change (DCC) are used.
CSCtf20370
When the line card is reverted from the protect mode to the working mode, it
crashes the PRE and the working line card.
CSCtf28247
DOCSIS 3.0 cable modems go offline after the SPA GigE link detects loss of signal
when fiber node is unplugged.
CSCtf34993
The IN and OUT packet counter in ifMIB is zero.
CSCtf40657
The "UBR10K_REDUNDANCY-4-RP_HA_STDBY_INCONSISTENT" error
message is displayed during the online insertion and removal (OIR) when any
interface on the line card being powered down is configured with spectrum management.
CSCtg49184
The output of the show hccp event-history command displays incorrect error information.
CSCtg78358
The protect line card crashed after performing a manual switchover from working
Cisco uBR10-MC5x20H line card to the protect line card.
CSCtg90865
A non-primary Multicast (MC) interface is selected for multicast forwarding.
CSCtg94564
CMTS crash may be observed due to memory corruption.
CSCth18889
Multicast traffic is not received by the cable modem.
CSCth25715
Some Wideband Cable Modems (WCMs) do not get w-online after reloading Cisco
CMTS.
CSCth30415
PROC_WATCHDOG does not work with the standby PRE on Cisco uBR10012
router.
CSCth49224
The default interface service flow for multicast QoS is not created after a line card
switchover.
CSCth52908
IPC-5- WATERMARK, UBR10K-3-QUEUEFULL messages are repeatedly
displayed on the Cisco uBR10012 router.
CSCth54817
The static multicast group configuration on the integrated cable interfaces is not
synchronized after a line card switchover.
CSCth89308
There is a delay of Cisco uBR10012 route processor or cable line card to detect a
IPC keepalive timeout condition, which in turn causes the delay of IPC recovery
actions that are triggered by the detect.
CSCti19280
The FFT engine is not updated with the CNR threshold values if a change is made
either in the CLI or the SNMP interface to the CNR threshold profile for a given
upstream.
CSCti30196
CMTS may crash when a SNMP query or any other event makes the CMTS to go
through the list of ALL service-flows.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-3
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Resolved Caveats—Cisco IOS Release 12.2(33)SCB11
Bug ID
Description
CSCtd25669
When a secondary rf-channel shutdown/no shutdown is performed on a Cisco
uBR-MC8X8 cable interface line card, the wideband CM reports primary-channel
QAM failure/recovery.
CSCtd43242
An IPC timeout could lead to a crash on the Cisco uBR10-MC5X20H line card.
CSCti05750
The Half-Height Gigabit Ethernet (HHGE) line cards stop functioning after Cisco
Wideband SPAs are inserted into the Cisco SIP-600.
CSCti71911
When a Cisco IOS release 12.2(33)SCB10 downgrade is performed on the active
PRE, the standby PRE resets the peak-rate TLV.
CSCti81896
When the ingress cancellation feature is enabled, all modems on an upstream may
momentarily go offline and then recover within minutes.
CSCtj74625
When an ISSU is performed from Cisco IOS Release 12.2(33)SCB4 (or previous
releases) to Cisco IOS Release 12.2(33)SCB5 (or later releases), the DTCC may
implement an uncontrolled upgrade of the firmware. This could disrupt service for
a few minutes.
Open Caveats—Cisco IOS Release 12.2(33)SCB10
Bug ID
Description
CSCsw78972
The MAC Domain Descriptor (MDD) change message is getting generated on all
RF channels.
CSCsx46105
Gigabit Ethernet channel is not working with 802.1q subinterfaces.
CSCsx49779
A modem in w-online state comes online after the line card reset.
CSCsx72877
Tracebacks and Inter-Process Communication (IPC) error messages are appearing
in CMTS loaded with Cisco IOS Release 12.2(33)SCB1.
CSCsy14569
Memory leak occurs after deleting subinterface.
CSCsy16511
Re-ordering of modulation profile rates are not working after changing modulation
profiles on an upstream.
CSCsy21280
Cisco Parallel eXpress Forwarding (PXF) forwards traffic up to 300 Mbps to route
processor (RP).
CSCsy23149
The Cisco uBR10012 router displays wrong slot numbers in MIB.
CSCsy93204
The cmts walk and snmp walk commands on the Address Resolution Protocol
(ARP) table results in high CPU utilization.
CSCsz24175
The uBR10012 router repeatedly generates the “%UBR10000-6-MAP_UPSTREAM_BW_ALLOCATION” syslog message.
CSCsz34637
The show pxf cpu queue interface command has no filtering option to display
non-zero length or drop count.
CSCsz36328
Cable modems remain in online(pk) and expired states after cable privacy
mandatory command is executed.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-4
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Bug ID
Description
CSCsz37891
The Cisco uBR10012 router crashed because it ran out of unfragmented memory.
CSCsz43764
Wideband SIP crashes after running show controller modular command.
CSCsz56522
Potential wideband SPA Index leak is observed during the line card switchover.
CSCsz63011
Cable metering traps are not getting generated for streaming mode.
CSCsz67716
The 'Gate Report State' counter of the show packetcable cms verbose command
output is not getting incremented for PacketCable MultiMedia (PCMM) policy
servers.
CSCta58106
Non-default service flows and downstream service identifier (DSID) entries are
created when default multicast service flow fails.
CSCta68834
DOCSIS Setup Gateway (DSG) service class name change deletes multicast
quality of service (MQoS).
CSCta76326
Leak occurs in multicast static index after a line card switchover.
CSCta88850
Multicast session disappears after changing DSG tunnel service class.
CSCtb30957
The PRE crashes when multiple users issue the test hccp rfswitch relay command
in quick succession.
CSCtb61654
All wideband cable modems on the Wideband SPA unexpectedly go offline and
never tried ranging.
CSCtb62538
The no cable metering command reloads the standby.
CSCtb68175
High CPU usage in the Cisco uBR10-MC5X20U line card after bootup.
CSCtb74904
The service flow counter displays wrong values on the Cisco uBR10012 router
after a PRE module switchover.
CSCtb79237
No system log or SNMP trap gets generated when COPS process, that is used for
packetcable, fails.
CSCtc34111
Cable modems are coming NB-online instead of w-online.
CSCtc44487
Router crashes when a Cisco UBR-MC20X20V line card is added or removed from
the redundancy configuration.
CSCtc65910
A header buffer memory leak may be observed on Cisco CMTS.
CSCtd77576
High CPU utilization in Cisco uBR10-MC5X20U line card for N+1 setup.
CSCte84191
There is a mismatch of the BPI index between the cable line card and the remote
SPA when a redundancy is not configured on the line card and the guardian line
card is rebooted.
CSCte91760
Simulating an intermediate session routing (ISR) watchdog using a busy-loop
delay in an ISR, results in an incorrect traceback. Further, an infinite loop in the
ISR results in no ISR watchdog functionality at all.
CSCtf04817
A cable line card crashes when the debug cable mac-protocol command and
dynamic channel change (DCC) are used.
CSCtf20370
When the line card is reverted from the protect mode to the working mode, it
crashes the PRE and the working line card.
CSCtf28247
DOCSIS 3.0 cable modems go offline after the SPA GigE link detects loss of signal
when fiber node is unplugged.
CSCtf34993
Query on ifMIB returns error packets.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-5
Chapter 2
Bug ID
Description
CSCtf40657
The "UBR10K_REDUNDANCY-4-RP_HA_STDBY_INCONSISTENT" error
message is displayed during the online insertion and removal (OIR) when any
interface on the line card being powered down is configured with spectrum management.
CSCtg49184
The output of the show hccp event-history command displays incorrect error information.
CSCtg78358
The protect line card crashed after performing a manual switchover from working
Cisco uBR10-MC5x20H line card to the protect line card.
CSCtg90865
A non-primary Multicast (MC) interface is selected for multicast forwarding.
CSCtg94564
CMTS crash may be observed due to memory corruption.
CSCth18889
Multicast traffic is not received by the cable modem.
CSCth25715
Some Wideband Cable Modems (WCMs) do not get w-online after reloading Cisco
CMTS.
CSCth29344
Cable Modems may fail to come online or remain online due to lack of SPA resources.
CSCth30415
PROC_WATCHDOG does not work with the standby PRE on Cisco uBR10012
router.
CSCth49224
The default interface service flow for multicast QoS is not created after a line card
switchover.
CSCth52908
IPC-5- WATERMARK, UBR10K-3-QUEUEFULL messages are repeatedly
displayed on the Cisco uBR10012 router.
CSCth54817
The static multicast group configuration on the integrated-cable interfaces are not
synchronized after a line card switchover.
CSCth89308
There is a delay of Cisco uBR10012 route processor or cable line card to detect a
IPC keepalive timeout condition, which in turn causes the delay of IPC recovery
actions that are triggered by the detect.
CSCti07013
Upstream speed down and Cyclic Redundancy Check (CRC) error increases in a
Cisco uBR0012 router with Cisco MC5x20U cable line card.
CSCti07829
The "Modular primary" interface column is found missing from the multicast forwarding table and PXF table when OIR is performed on the Cisco MC5X20 cable
line card.
CSCti19280
The FFT engine is not updated with the CNR threshold values if a change is made
either in the CLI or the SNMP interface to the CNR threshold profile for a given
upstream.
CSCti30196
CMTS may crash when a SNMP query or any other event makes the CMTS to go
through the list of ALL service-flows.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-6
Caveat List for Cisco IOS Release 12.2(33)SCB
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Resolved Caveats—Cisco IOS Release 12.2(33)SCB10
Bug ID
Description
CSCsg82766
CMTS may crash due to a bus error during user authentication.
CSCsr40529
Corrupted output is displayed when the standby disk is formatted during an In-Service Software Upgrade (ISSU) of the CMTS router running Cisco IOS Release
12.2(33)SCB4.
CSCsr96042
Router crashes when the VPN Routing and Forwarding (VRF) configuration is
changed.
CSCsv73754
A router crash is observed during VPN Routing and Forwarding (VRF) configuration.
CSCsw47080
IPv4 configuration is required for the IPv6 to work over CMTS bundle subinterface.
CSCsw47557
The IPv6 cable modems are not deleted when the CMTS bundle interface Layer 3
configuration is removed.
CSCsx58335
When relaying to multiple servers from an unnumbered interface, the DHCP relay
sends packets to all servers, even for packets where the client is in a RENEWING
state unicasting to attempt to reach a single server.
CSCsx62592
CMTS may crash during the change of IP address configuration of the bundle interface.
CSCsy38998
The CPUHOG error message and traceback may be seen on the protect line card
of a Cisco uBR10012 router.
CSCsz48174
Cable modems do not come online when the member subslot x/y working
command configured twice and line card switchover occurs.
CSCtb95504
Wideband modems are getting stuck in Reject(c) state due to IPC issues.
CSCtc73759
The H.323 implementation in Cisco IOS Software contains two vulnerabilities that
may be exploited remotely to cause a denial of service (DoS) condition on a device
that is running a vulnerable version of Cisco IOS Software.
CSCtc95495
The show cable modem service-flow verbose command incorrectly displays the
MAC Rewrite Indices (MRI) that exceed 64 K. Subsequent information displayed
by this command is also incorrect because it is dependent on the MRI.
CSCtd14220
Tracebacks is observed during the automatic upgrade of DOCSIS Timing, Communication, and Control (DTCC) card firmware.
CSCtd20903
The cable clock dti command does not work occasionally when one of the two
DTCC cards in the CMTS system is unplugged during run time.
CSCtd26295
The debug output to the terminal is truncated when the logging discriminator is
enabled.
CSCtd28028
Flow control does not work on the 1-port Gigabit Ethernet half-height
(ESR-HH-1GE) interface of a Cisco uBR10012 router.
CSCtd37319
The IOS reports the fan tray status first as missing, partial failure or total failure
for a brief period and later reports the status as OK.
CSCtd83463
The DOCSIS 3.0 cable modem goes offline after the test cable dcc command is
executed with a ranging technique of 1.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-7
Chapter 2
Bug ID
Description
CSCtd86472
The Cisco IOS Software Network Address Translation functionality contains three
denial of service (DoS) vulnerabilities. The first vulnerability is in the translation
of Session Initiation Protocol (SIP) packets, the second vulnerability in the translation of H.323 packets and the third vulnerability is in the translation of H.225.0
call signaling for H.323 packets.
CSCte13340
The PRE4 processor module displays a high rate of IPC errors consistently.
CSCte17479
All cable modems under a single upstream unexpectedly move to expire (pt) state
on the Cisco uBR10012 router.
CSCte49666
The CMTS crashes due to a bus error when PRE module is out of memory.
CSCte74609
All cable modems go offline when the Wideband line card crashes.
CSCte75276
After PRE switchover on Cisco uBR10012 router, an error message is displayed
indicating that the IPC message received has inconsistent header data.
CSCte77042
The cable modems drop offline during switchover and revertback of the Cisco
UBR-MC20X20V line card.
CSCte77426
All the line cards crash because of the Dynamic Host Configuration Protocol
Daemon (DHCPD) receive process
CSCte83897
The output of the MIB object docsDiag is not complete when the number of CMs
in error state is greater than 30.
CSCte91500
An error is seen when the cable modem sends malformed mac-mgmt pak to the
Cisco CMTS.
CSCte93995
Packets are delayed in prioritized downstream flows, which results in delayed or
no dial tone.
CSCte96459
The Cisco UBR-MC20X20V cable line card on the Cisco CMTS running Cisco
IOS Release 12.2(33)SCC3 crashes due to Hot Standby Connection-to-Connection
Protocol (HCCP) assert failure.
CSCte97922
The hardware version, software version and serial number are not displayed for
UBR10-FAN-ASSY, UBR10-PWR-DC and UBR10-PWR-AC modules.
CSCte99323
The Secondary PRE is reset due to parser return error after the secondary collector
associate on the IPDR config is added or deleted.
CSCtf05943
Cable modem subscribers experience one-way Real-Time Transport Protocol
(RTP) traffic.
CSCtf20577
The CAM entries are not populated correctly for the IPv6 Multicast Traffic.
CSCtf37141
The maximum character length for the VRF name is 32 characters. When configuring the VRF parameter for the divert rate limit trusted sites, the command
accepts 32 characters. However only 31 characters are displayed in the running
configuration and in the output of the show pxf cpu drl-trusted-sites command
CSCtf48376
The Cisco CMTS crashes when the show cable modem <ip> service flow verbose
command is executed several times.
CSCtf65153
The "tsec_tx_interrupt: WARNING transmit underrun occurred" occurs on DTCC
card even when there is no underrun.
CSCtf69637
JIB downstream ring is stuck leading to excessive uniform call distribution (UCD)
update error handling due to no map buffer. This affects voice calls on other
upstreams on a different MAC domain.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-8
Caveat List for Cisco IOS Release 12.2(33)SCB
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Bug ID
Description
CSCtf80506
Multiple grants per interval (MGPI) may not work in Cisco IOS Release
12.2(33)SCB and later.
CSCtf83476
The wideband interface on the standby route processor is not changed from the
primary bonding group to the secondary bonding group using snmp set ccwbWBBondGrpSecondary.
CSCtg07854
Packets are assigned to wrong queues when the policy-map configuration is
modified.
CSCtg09730
The show inventory command does not list all compact flash cards.
CSCtg12222
The DOCSIS 3.0 cable modems may come online in narrowband mode.
CSCtg12263
Some warning messages related to load balancing need to be listed as error
messages.
CSCtg12714
PacketCable Multimedia (PCMM) gate synchronization messages are dropped on
the active PRE module after clear cable modem all delete command is executed.
CSCtg21410
Performance Routing Engine (PRE) crashes when polling SNMP MIB object ciscoFlashMIB.
CSCtg30528
The Cisco CMTS router takes a long time to complete the addition of extended
access control list (ACL) entries.
CSCtg40023
MAC Rewrite Indices (MRI) are different on the active and standby PRE modules;
the standby PRE module has more entries than the active PRE module.
CSCtg40581
Missing entries when polling the SNMP MIB object ifStackStatus.
CSCtg48066
Reprogramming the Blaze field-programmable gate array (FPGA) fails on the
DOCSIS 24-RF channel SPA.
CSCtg49195
The cable modem database is corrupted and the modems go offline after a switchover as the database is not synchronized between the Route Processor and the line
card.
CSCtg52140
The cable modem database is corrupted and the modems go offline after a switchover as the database is not synchronized between the Route Processor and the line
card.
CSCtg73667
The Cisco Wideband SPA and the Cisco SIP-600 SIP crashed due to a watchdog
reset and automatically reloaded.
CSCtg88052
The following message is seen on the Cisco CMTS after shutting down a Gigabit
Ethernet (GE) interface even if the XFP/SFP is not removed:
CSCtg92199
The Support for IfMIB is added for CMTS bundle IPv6 subinterface.
CSCth31143
The show inventory command on a PRE-2 with a 64MB flashdisk wrongly
displays flashdisk size as 128MB.
CSCth43735
Layer 3 traffic does not flow from an interface of the 5-Port Gigabit Ethernet
Shared Port Adapter until a reload of the SPA, SIP, or chassis occurs.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-9
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Open Caveats—Cisco IOS Release 12.2(33)SCB9
Bug ID
Description
CSCsw78972
The MAC Domain Descriptor (MDD) change message is getting generated on all
RF channels.
CSCsx46105
Gigabit Ethernet channel is not working with 802.1q subinterfaces.
CSCsx49779
A modem in w-online state comes online after the line card reset.
CSCsx72877
Tracebacks and Inter-Process Communication (IPC) error messages are appearing
in CMTS loaded with Cisco IOS Release 12.2(33)SCB1.
CSCsy14569
Memory leak occurs after deleting subinterface.
CSCsy16511
Re-ordering of modulation profile rates are not working after changing modulation
profiles on an upstream.
CSCsy21280
Cisco Parallel eXpress Forwarding (PXF) forwards traffic up to 300 Mbps to route
processor (RP).
CSCsy23149
The Cisco uBR10012 router displays wrong slot numbers in MIB.
CSCsy93204
The cmts walk and snmp walk commands on the Address Resolution Protocol
(ARP) table results in high CPU utilization.
CSCsz24175
The uBR10012 router repeatedly generates the “%UBR10000-6-MAP_UPSTREAM_BW_ALLOCATION” syslog message.
CSCsz34637
The show pxf cpu queue interface command has no filtering option to display
non-zero length or drop count.
CSCsz43764
Wideband SIP crashes after running show controller modular command.
CSCsz63011
Cable metering traps are not getting generated for streaming mode.
CSCsz67716
The 'Gate Report State' counter of the show packetcable cms verbose command
output is not getting incremented for PacketCable MultiMedia (PCMM) policy
servers.
CSCta58106
Non-default service flows and downstream service identifier (DSID) entries are
created when default multicast service flow fails.
CSCta68834
DOCSIS Setup Gateway (DSG) service class name change deletes multicast
quality of service (MQoS).
CSCta76326
Leak occurs in multicast static index after a line card switchover.
CSCta88850
Multicast session disappears after changing DSG tunnel service class.
CSCtb30957
The PRE crashes when multiple users issue the test hccp rfswitch relay command
in quick succession.
CSCtb62538
The no cable metering command reloads the standby.
CSCtb68175
High CPU usage in the Cisco uBR10-MC5X20U line card after bootup.
CSCtb74904
The service flow counter displays wrong values on the Cisco uBR10012 router
after a PRE module switchover.
CSCtb95504
Wideband modems are getting stuck in Reject(c) state due to IPC issues.
CSCtc34111
Cable modems are coming NB-online instead of w-online.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-10
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Bug ID
Description
CSCtc44487
Router crashes when a Cisco UBR-MC20X20V line card is added or removed from
the redundancy configuration.
CSCtd14220
Tracebacks is observed during the automatic upgrade of DOCSIS Timing, Communication, and Control (DTCC) card firmware.
CSCtd20903
The cable clock dti command does not work occasionally when one of the two
DTCC cards in the CMTS system is unplugged during run time.
CSCtd28028
Flow control does not work on the 1-port Gigabit Ethernet half-height
(ESR-HH-1GE) interface of a Cisco uBR10012 router.
CSCtd43242
An IPC timeout could lead to a crash on the Cisco uBR10-MC5X20H line card.
CSCtd77576
High CPU utilization in Cisco uBR10-MC5X20U line card for N+1 setup.
CSCtd83463
DOCSIS 3.0 cable modem goes offline after executing test cable dcc command.
CSCte17479
All cable modems under a single upstream unexpectedly move to expire (pt) state
on the Cisco uBR10012 router.
CSCte67253
Spumoni uptime output does not include CPU utilization data.
CSCte73241
Downstream traffic freezes due incorrect service-flow installation.
CSCte77426
All the line cards crash because of the Dynamic Host Configuration Protocol
Daemon (DHCPD) receive process.
CSCte84191
There is a mismatch of the BPI index between the cable line card and the remote
SPA when a redundancy is not configured on the line card and the guardian line
card is rebooted.
CSCte93995
Packets are delayed in prioritized downstream flows, which results in delayed or
no dial tone.
CSCtf04817
A cable line card crashes when the debug cable mac-protocol command and
dynamic channel change (DCC) are used.
CSCtf05943
Cable modem subscribers experience one-way Real-Time Transport Protocol
(RTP) traffic.
CSCtf20370
When the line card is reverted from the protect mode to the working mode, it
crashes the PRE and the working line card.
CSCtf34993
Query on ifMIB returns error packets.
Resolved Caveats—Cisco IOS Release 12.2(33)SCB9
Bug ID
Description
CSCtd60792
The standby PRE2 module may reset automatically because of PEER_INIT_TIMEOUT.
CSCtd86472
The Cisco IOS Software Network Address Translation functionality contains three
denial of service (DoS) vulnerabilities. The first vulnerability is in the translation
of Session Initiation Protocol (SIP) packets, the second vulnerability in the translation of H.323 packets and the third vulnerability is in the translation of H.225.0
call signaling for H.323 packets.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-11
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Bug ID
Description
CSCtg96059
The standby route processor is continuously reset and does not proceed to stateful
switchover (SSO).
CSCth86975
ARP entries with same bundle MAC are stored in the standby PRE when they are
added to the Cisco CMTS.
Open Caveats—Cisco IOS Release 12.2(33)SCB8
Bug ID
Description
CSCsw78972
The MAC Domain Descriptor (MDD) change message is getting generated on all
RF channels.
CSCsx46105
Gigabit Ethernet channel is not working with 802.1q subinterfaces.
CSCsx49779
A modem in w-online state comes online after the line card reset.
CSCsx72877
Tracebacks and Inter-Process Communication (IPC) error messages are appearing
in CMTS loaded with Cisco IOS Release 12.2(33)SCB1.
CSCsy14569
Memory leak occurs after deleting subinterface.
CSCsy16511
Re-ordering of modulation profile rates are not working after changing modulation
profiles on an upstream.
CSCsy21280
Cisco Parallel eXpress Forwarding (PXF) forwards traffic upto 300 Mbps to route
processor (RP).
CSCsy23149
The Cisco uBR10012 router displays wrong slot numbers in MIB.
CSCsy93204
The cmts walk and snmp walk commands on the Address Resolution Protocol
(ARP) table results in high CPU utilization.
CSCsz24175
The uBR10012 router repeatedly generates the “%UBR10000-6-MAP_UPSTREAM_BW_ALLOCATION” syslog message.
CSCsz34637
The show pxf cpu queue interface command has no filtering option to display
non-zero length or drop count.
CSCsz43764
Wideband SIP crashes after running show controller modular command.
CSCsz55288
Alignment traceback messages are found after executing the show memory leak
res user and show buffer usage commands.
CSCsz63011
Cable metering traps are not getting generated for streaming mode.
CSCsz67716
The 'Gate Report State' counter of the show packetcable cms verbose command
output is not getting incremented for PacketCable MultiMedia (PCMM) policy
servers.
CSCta58106
Non-default service flows and downstream service identifier (DSID) entries are
created when default multicast service flow fails.
CSCta68834
DOCSIS Setup Gateway (DSG) service class name change deletes multicast
quality of service (MQoS).
CSCta76326
Leak occurs in multicast static index after a line card switchover.
CSCta88850
Multicast session disappears after changing DSG tunnel service class.
CSCtb09245
Memory fragmentation occurs during multicast traffic.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-12
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Bug ID
Description
CSCtb30957
The PRE crashes when multiple users issue the test hccp rfswitch relay command
in quick succession.
CSCtb62538
The no cable metering command reloads the standby.
CSCtb68175
High CPU usage in the Cisco uBR10-MC5X20U line card after bootup.
CSCtb74904
The service flow counter displays wrong values on the Cisco uBR10012 router
after a PRE module switchover.
CSCtb95504
Wideband modems are getting stuck in Reject(c) state due to IPC issues.
CSCtc34111
Cable modems are coming NB-online instead of w-online.
CSCtc44487
Router crashes when a Cisco UBR-MC20X20V line card is added or removed from
the redundancy configuration.
CSCtd14220
Tracebacks are observed during the automatic upgrade of DOCSIS Timing, Communication, and Control (DTCC) card firmware.
CSCtd20903
The cable clock dti command does not work occasionally when one of the two
DTCC cards in the CMTS system is unplugged during run time.
CSCtd23429
High latency (measured between the join and the multicast packets forwarded) is
observed during Video over DOCSIS (VDOC) channel changes.
CSCtd28028
Flow control does not work on the 1-port Gigabit Ethernet half-height
(ESR-HH-1GE) interface of a Cisco uBR10012 router.
CSCtd43242
An IPC timeout could lead to a crash on the Cisco uBR10-MC5X20H line card.
CSCtd77576
High CPU utilization in Cisco uBR10-MC5X20U line card for N+1 setup.
CSCtd83463
DOCSIS 3.0 cable modem goes offline after executing test cable dcc command.
CSCte17479
All cable modems under a single upstream unexpectedly move to expire (pt) state
on the Cisco uBR10012 router.
CSCte67253
Spumoni uptime output does not include CPU utilization data.
CSCte73241
Downstream traffic freezes due incorrect service-flow installation.
CSCte77426
All the line cards crash because of the Dynamic Host Configuration Protocol
Daemon (DHCPD) receive process
CSCte84191
There is a mismatch of the BPI index between the cable line card and the remote
SPA when a redundancy is not configured on the line card and the guardian line
card is rebooted.
CSCte93995
Packets are delayed in prioritized downstream flows, which results in delayed or
no dial tone.
CSCtf04817
A cable line card crashes when the debug cable mac-protocol command and
dynamic channel change (DCC) are used.
CSCtf05943
Cable modem subscribers experience one-way Real-Time Transport Protocol
(RTP) traffic.
CSCtf20370
When the line card is reverted from the protect mode to the working mode, it
crashes the PRE and the working line card.
CSCtf34993
Query on ifMIB returns error packets.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-13
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Resolved Caveats—Cisco IOS Release 12.2(33)SCB8
Bug ID
Description
CSCtc73759
The H.323 implementation in Cisco IOS Software contains two vulnerabilities that
may be exploited remotely to cause a denial of service (DoS) condition on a device
that is running a vulnerable version of Cisco IOS Software.
CSCte14603
A vulnerability in the Internet Group Management Protocol (IGMP) version 3 implementation of Cisco IOS Software and Cisco IOS XE Software allows a remote
unauthenticated attacker to cause a reload of an affected device. Repeated attempts
to exploit this vulnerability could result in a sustained denial of service (DoS) condition. Cisco has released free software updates that address this vulnerability.
CSCtg93638
Cable interface line card crashes due to bus error after receiving Dynamic Service
Addition (DSA) or Dynamic Service Change (DSC) acknowledgement from the
cable modem.
Open Caveats—Cisco IOS Release 12.2(33)SCB7
•
CSCsy23149
Symptoms: The MIB object “entPhysicalName” for theCisco uBR10012 router does not display the
values correctly. The values as displayed as slot 0/0/0 and slot 0/1/0 for the PRE processor modules
instead of being displayed as 0A and 0B from left to right. Similarly, the MIB object
“entPhysicalName” returns slot x/x/x (for example, 1/0/0) instead of the values displayed in the
device.
Conditions: This issue occurs while querying the MIB object “entPhysicalName”.
Workaround: There is no workaround.
•
CSCsy93204
Symptoms: Executing the cmts walk command on ARP table causes high CPU utilization. This is
also seen while using the snmp walk command on the ARP table.
Conditions: This issue occurs while using the cmts walk and snmp walk commands.
Workaround: To prevent high CPU utilization when using the snmp walk command, use snmp view
commands:
snmp-server view cutdown iso included
snmp-server view cutdown at excluded
snmp-server community public view cutdown ro
snmp-server community private view cutdown rw
•
CSCte95852
Symptoms: The Cisco CMTS cannot communicate with the eMTAs that are in the same VPN
Routing and Forwarding (VRF).
Conditions: This issue is seen when the line card failover occurs.
Workaround: Execute the clear cable host vrf ip address command.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-14
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCtf19137
Symptoms: Downstream counters do not increase for the NCS and Unsolicited Grants (UGS) service
flow IDs (SFIDs).
Conditions: This issue is seen when:
– the cable modem is put in a data VPN using basic SID-to-VRF mapping.
– the embedded media terminal adapters (eMTA) from the same CM is put in the voice VPN using
static SF-to-VRF mapping in the DOCSIS file.
– cable dynamic-flow vrf command is used for the UGS flow.
Workaround: There is no workaround.
•
CSCtf34993
Symptoms: The IN and OUT packet counter in ifMIB is zero.
Conditions: This issue is seen when you query the ifMIB.
Workaround: There is no workaround.
•
CSCte67253
Symptoms: The Spumoni "uptime" output does not include CP Utilization.
Conditions: This issue is seen when you use "uptime" on the Spumoni SPA card.
Workaround: There is no workaround.
•
CSCsz55288
Symptoms: Alignment traceback messages are found when the show memory leak res user and
show buffer usage commands are executed.
Conditions: This issue occurs when the show memory leak res user and show buffer usage
commands are executed in Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCtd23429
Symptoms: High latency (measured between the join and multicast packet forwarded) is observed
during Video over DOCSIS (VDOC) channel changes.
Conditions: This issue is seen on universal broadband routers running the
Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsx46105
Symptoms: Port-channel interfaces used in conjunction with 802.1q subinterfaces show a number
of problems on both the PRE4 and PRE2 processor modules. This was observed while testing the
Cisco SPA-5X1GE-V2 in Cisco IOS Release 12.2(33)SCB. The problem appears to be with the
4-jacket WAN interface, and not with the older half-height Gigabit Ethernet interfaces.
Conditions: This issue occurs in a PRE2 processor module under the following conditions:
– Any change to member links (adding or removing or executing the shut or no shut commands)
requiring that the port-channel subinterface be deleted and reconfigured.
– A reload of CMTS requiring that port-channel subinterface be deleted and reconfigured to
restore traffic.
This issue occurs in a PRE4 processor module under the following conditions:
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-15
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
– A reload of CMTS requiring a PXF microcode reload in order to restore traffic over
port-channel subinterface.
– The show pxf cpu statistics drop command shows “fib rpf” fails under the interface
port-channel interface.
Workaround: To restore the traffic, do the following:
1.
Copy the configuration of the port-channel and the VLANS.
2.
Delete the port-channels.
3.
Edit the configuration to configure Gigabit Ethernet interfaces in a port-channel, before
configuring VLAN subinterfaces.
4.
Paste the edited configuration in the CMTS.
Theoretically, you can boot the CMTS with no Ethernet channel configured, and copy an edited
production configuration file to running-config after all the interfaces are up.
•
CSCte93995
Symptoms: Prioritized traffic in a downstream service flow is delayed for a few seconds.
Conditions: This issue is seen in the voice signaling exchange that create a lot of retransmission due
to the short timeout between retransmission.
Workaround: Reset the modem.
•
CSCsz34637
Symptoms: There is no "filtered" option to the show pxf cpu queue interface command for
displaying queue with non-zero length or drop count.
Conditions: There are no specific conditions for this issue to occur.
Workaround: There is no workaround.
•
CSCsy21280
Symptoms: PXF forwards traffic up to 300 Mbps to the Route Processor (RP) using 1500-byte IPv6
packets.
Conditions: This issue occurs when Physical Logical Bandwidth Limiting Traffic (PBLT) for the RP
CPU queue is set to 300 Mbps. The show pxf cpu queue command displays this information.
Workaround: Change the value to 44 Mbps (DS3 Bandwidth) for the PRE2 processor module and
1.6 times 44 Mbps for the PRE4 processor module.
•
CSCtf05943
Symptoms: Cable modem subscribers experience one-way Real-Time Transport Protocol (RTP)
traffic.
Conditions: This issue is seen on the Cisco uBR10012 universal broadband routers running the
Cisco IOS Release 12.2(33)SCB4 or Cisco IOS Release 12.2(33)SCB5 and with at least 2-Gigabit
uplinks towards the core.
Workaround: Do any one of the following:
1.
Downgrade to 12.3(21)BC7.
2.
Remove one of the Gigabit uplinks.
3.
Perform a microcode reload.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-16
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsw78972
Symptoms: The MAC Domain Descriptor (MDD) change message is generated on all the RF
channels globally for any RF channel configured on the CMTS.
Conditions: This issue occurs when an MDD change is supposed to be generated for channels within
the MAC domain.
Workaround: There is no workaround.
•
CSCtd14220
Symptoms: Traceback is seen during auto-upgrade of DOCSIS Timing, Communication and Control
(DTCC) card firmware.
Conditions: This issue occurs on a firmware upgrade of DTCC card.
Workaround: There is no workaround.
•
CSCtf04817
Symptoms: A cable line card may crash when you run the debug cable mac-protocol command
while DCC is being used.
Conditions: This issue is seen on the Cisco uBR10012 universal broadband routers running the
Cisco IOS Release 12.2(33)SCB5.
Workaround: Disable the debug cable mac-protocol command.
•
CSCtd20903
Symptoms: The cable clock dti command does not work.
Conditions: This issue occurs when the system starts with two DTCC cards, and one card is
unplugged during the run time.
Workaround: There is no workaround.
•
CSCtb62538
Symptoms: The standby reloads when you execute the no cable metering command.
Conditions: This issue is seen in the streaming mode on the Cisco uBR10012 universal broadband
routers running the Cisco IOS Release 12.2(33)SCB and Cisco IOS Release 12.2(33)SCC.
Workaround: There is no workaround.
•
CSCtb68175
Symptoms: The Cisco uBR10-MC5x20U line card’s CPU remains at 99-100% for 10+ minutes after
the line card bootup.
The Route Processor (RP) and LC experience an IPC transmission/reception failure. The LC may
reload (if line card high availability (LCHA) is not enabled) or switchover to protect the LC (if
LCHA is enabled) due to IPC keepalive failure.
Conditions: This issue is seen when more than 3000 cable modems are connected to the
Cisco uBR10-MC5x20U line card with EAE/BPI+ enabled.
Workaround: Disable the global ranging throttling by running the no cable throttle-ranging
command and configure the fixed insertion interval to a higher value (for example, 500) for each
MAC domain by running the cable insertion-interval 500 command.
•
CSCte93541
Symptoms: After a PRE failover, wideband modems dropped offline on multiple downstreams.
Conditions: This issue is seen on the Cisco uBR10012 universal broad band routers on PRE-2
running the Cisco IOS Release 12.2(33)SCB.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-17
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Delete the fiber node configuration and reconfigure it.
•
CSCsy14569
Symptoms: A memory leak was observed after deleting the subinterface.
Conditions: This issue is seen while deleting a subinterface.
Workaround: There is no workaround.
•
CSCsy16511
Symptoms: When applying modulation profiles to an upstream port, the modulation profiles are
re-ordered, high performance to robust/low performance. Modifying the order of the
modulation/symbol rate on the profile does not happen.
Conditions: If the signal-to-noise ratio (SNR) threshold is set at 25 with a hysteresis of 2 (bypassing
all FEC), the modulation on the upstream will be QPSK until the SNR falls below 25 dB where it
will change to 16-QAM. When the SNR reaches 27 dB (25 dB + 2 dB), the modulation reverts to
QPSK. When a line card switchover is performed, the modulation profiles are re-ordered on the
protect card.
Workaround: Remove and re-apply modulation-profile configuration on the upstream port after
modifying the modulation profiles.
•
CSCsz24175
Symptoms: A Cisco uBR10012 universal broadband router may see the following syslog generated
repeatedly:
%UBR10000-6-MAP_UPSTREAM_BW_ALLOCATION: A transmit opportunity was missed because MAP
arrived too late
Conditions: There are no specific conditions for this issue to occur.
Workaround: There is no workaround.
•
CSCtf20370
Symptoms: When you revert the line card from protect to working mode, it crashes the PRE and the
working line card.
Conditions: This issue is seen on a Cisco uBR10012 universal broadband router running the
Cisco IOS Release 12.2.(33)SCB4 with PRE-A switched to PRE-B and the Cisco CMTS using the
protect card in slot 5/1.
Workaround: There is no workaround.
•
CSCta88850
Symptoms: When changing the service class on the fly for DSG tunnel, CMTS removes the old
service flow but fails to repopulate new service flows.
Conditions: There are no specific conditions for this issue to occur.
Workaround: Remove the DSG tunnel from the interface and re-config it.
•
CSCtb61654
Symptoms: All WCMs on Wideband SPA unexpectedly go offline and never tried ranging.
During this period, the SPA sends out only the SYNC packets, and not packets from MC520 (MDD,
secondary MDD, UCD, MAP, and so on).
Conditions: This issue is observed in 3-Channel bonding with DTI.
Workaround: Online insertion and removal of the SPA might resolve this issue.
•
CSCtd73908
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-18
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Excessive unicast and multicast packet loss is seen on a Wideband SPA switchover.
Conditions: This issue occurs on a Wideband SPA GigabitEthernet interface. The switchover takes
70 seconds to converge.
Workaround: There is no workaround.
•
CSCtd77576
Symptoms: There is high CPU utilization on the Cisco uBR10-MC5x20U cable line card.
Conditions: This issue is seen when N+1 line card protection is configured and there are a large
number of VDOC channel changes resulting in IGMP joins and leaves.
Workaround: Disable the N+1 line card protection.
•
CSCte73241
Symptoms: Downstream traffic freezes due to the service flow not correctly installed.
Conditions: There are no specific conditions for this issue to occur.
Workaround: Reset the modem and re-install the service flows.
•
CSCta58106
Symptoms: Non default service flows and DSID entries were created when default multicast service
flow failed.
Conditions: This happens only when MQoS enabled scenario where admission control failed to
create multicast default SF.
Workaround: Make valid admission control parameters for the default service class template.
•
CSCta68834
When DOCSIS Setup Gateway (DSG) is configured with a service class, changing the service class
name triggers the deletion of multicast quality of service (MQoS). However, a new service flow is
not set up again.
Conditions: There are no specific conditions for this issue to occur.
Workaround: Remove the DSG configuration from the interface and re-configure it.
•
CSCte84191
Symptoms: There is mismatch of the BPI index between the cable line card and the remote SPA.
Conditions: This issue is seen when line card is running with no redundancy and the guardian line
card is rebooted. When the guardian line card is re-started, the unique indexes used to program the
SPA are lost and are overwritten by new modems coming online. Two modems now share the same
SPA keying index and either one of these modems can become Layer 3 unreachable depending on
when keys are written to the SPA.
Workaround: When the Guardian is rebooted, all modems on the line cards using that guardian
should be reset. The reset ensures that the modems have unique indexes to program the SPA.
Also, ensure that the guardian line card is running with redundancy.
•
CSCta76326
Symptoms: For multicast service flows, the index used for statistics collection is leaked when there
is a line card switchover.
Conditions: This issue is seen on a Cisco uBR10012 universal broadband router after a line card
switchover.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-19
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCtb09245
Symptoms: Memory fragmentation might occur with memory allocation of 65535 bundle MAC
entry elements.
Conditions: This issue is likely to occur with multicast traffic.
Workaround: There is no workaround.
•
CSCtb74904
Symptoms: After PRE switchover, the service flow counter shows 0 on the Cisco uBR10012 router.
Conditions: This issue occurs during a PRE switchover.
Workaround: There is no workaround.
•
CSCsx49779
Symptoms: The w-online state modem comes online after protect line cards are reset before a
resynchronization.The CMTS is configured with N+1 redundancy. If the working line card (7/0) is
reset, the modem switches to protect (5/0). If the protect (5/0) line card is reset before
resynchronization, the modem disappears, and comes in online instead of being in the w-online
state.The clear cable modem reset command does not work to bring the modem back to the
w-online state.
Conditions: This issue occurs while resetting an active line card during the standby line card bootup
period, but before the static synchronization of an active to standby line card finishes.
Workaround: Reload the line card or the CMTS.
•
CSCtb30957
Symptoms: The PRE crashes if multiple users simultaneously run the test hccp rfswitch relay
command in quick succession.
Conditions: There are no specific conditions for this issue to occur.
Workaround: There is no workaround.
•
CSCtd83463
Symptoms: The DOCSIS 3.0 cable modem goes offline after giving the test cable dcc command
with a ranging technique of 1.
Conditions: This issue occurs when the test cable dcc command is issued with a ranging technique
of 1.
Workaround: There is no workaround.
•
CSCtd98378
Symptoms: When ATDMA/64-QAM upstreams are saturated with traffic, a large amount of
downstream traffic may affect the upstream throughput. This throughput impact is also dependant
on whether the Dynamic Bandwidth Sharing (DBS) is configured or not.
Conditions: This issue is seen when all the following conditions are simultaneously met:
– PRE2 card is used.
– There are large amounts of packet queues (>500) congested by large amount of traffic.
– Packet length is no less than 1 KB.
Workaround: Do the following:
– Configure Enhanced Rate Bandwidth Allocation (ERBA) to use policing instead of queuing, to
reduce the packets queuing in the system.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-20
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
– Upgrade to PRE 4 card, which can store 256 K large packet handles (eight times that of PRE2).
•
CSCtc44487
Symptoms: The router crashes in Cisco IOS Release 12.3 (33) SCB, if the Cisco UBR-MC20X20V
card is added or removed from the redundancy configuration.
Conditions: This issue is observed when the line card type is unknown and the line card redundancy
is configured.
Workaround: There is no workaround.
•
CSCtf20175
Symptoms: After a dynamic channel change (DCC), IP connectivity to a CPE with multiple IPs
assigned a to single MAC address, is lost.
Conditions: This issue is seen on the Cisco uBR10012 universal broadband router running the
Cisco IOS Release 12.2(333)SCB5 onwards.
This issue is seen only for CPEs with multiple IP addresses statically assigned to a single MAC
address, behind a cable modem that has a DCC.
Workaround: Do the following:
– Clear the ARP for those multiple IP address.
– Remove the CM for Downstream load balancing.
•
CSCsz67716
Symptoms: The "Gate Report State" counter in the output of the show packetcable cms verbose
command does not increment for PacketCable Multimedia (PCMM) policy servers.
Conditions: This issue is seen for PCMM policy servers.
Workaround: There is no workaround.
•
CSCte77426
Symptoms: All line cards crash due to the Dynamic Host Configuration Protocol daemon (DHCPD)
receive process. The CPU hog messages are also observed due to the same process.
Conditions: This issue is seen on the Cisco uBR10012 (PRE4-RP) unviversal broadband router
running the Cisco IOS Release 12.2(333)SCB5.
Workaround: There is no workaround.
•
CSCtd28028
Symptoms: Flow-control does not work on ESR-HH-1GE interface of a Cisco uBR10012 router.
Conditions: This issue occurs on ESR-HH-1GE interface of a Cisco uBR10012 router.
Workaround: There is no workaround.
•
CSCsx72877
Symptoms: Traceback and IPC error messages may appear after the CMTS is loaded with the Cisco
IOS Release 12.2(33)SCB1 image.
Conditions: This issue is seen in routers running Cisco IOS Release 12.2(33)SCB1.
Workaround: There is no workaround.
•
CSCsz43764
Symptoms: In Cisco IOS Release 2.2(33)SCB3, executing the
show controller modular-cable x/y/z command with a copper SFP, SFP-GE-T, causes the
wideband SIP to crash.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-21
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: The issue will occur if we have Copper SFP in a Wideband SPA gigabit ethernet port.
Workaround: Use a fiber SFP and a fiber link instead of a copper link.
•
CSCte17479
Symptoms: All cable modems under a single upstream unexpectedly move to expire(pt) state.
Conditions: This issue occurs on a uBR10012 router running Cisco IOS Release 12.2(33)SCB3. The
other upstreams on the same line card are not affected.
Workaround: The modems do not recover automatically. Run shut/no shut on the upstream to
restore CMs.
•
CSCte41711
Symptoms: Tracebacks occur after the Hot Standby Connection-to-Connection Protocol (HCCP)
failover and revertback of the line card.
Conditions: This issue occurs after a line card reset, and an HCCP failover and revertback of the line
card.
Workaround: There is no workaround.
•
CSCtd43242
Symptoms: A crash may occur on the Cisco uBR10-MC5X20H line card.
Conditions: This issue occurs as the PRE module crashes due to a IPC time out.
Workaround: There is no workaround.
•
CSCsz63011
Symptoms: The cable metering traps are not generated as expected for streaming mode.
Conditions: There are no specific conditions for this issue to occur.
Workaround: There is no workaround.
•
CSCtc34111
Symptoms: The RCC is created, but no value is assigned to it in the intermediate state after the
wideband cable interface is initialized. This may cause the cable modems to coma NB-online instead
of w-online.
Conditions: There are no specific conditions for this issue to occur.
Workaround: There is no workaround.
•
CSCtb95504
Symptoms: Wideband modems do not come w-online and often flap in Reject(c) state. A telnet into
the line card console and IPC troubleshooting reveals IPC issues, such as failure of the
“ubr-test-request-api x/y block” for other slots.
Conditions: This issue is observed in the Cisco uBR10012 line card with DOCSIS 3.0 Widebandsetup and Wideband-capable modems.
Workaround: Change the Modular-host subslot in the Modular-Controller configuration. We
recommend that you use the Cisco uBR10-MC5X20H-D line cards. These cards provide better CPU
capacity.
You can also reset the hardware-module subslot x/y.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-22
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Resolved Caveats—Cisco IOS Release 12.2(33)SCB7
•
CSCsm88000
Symptoms: export-map route-map changes are not automatically updated in the Border Gateway
Protocol (BGP) VPNv4 table.
Conditions: This issue is seen on the universal broadband router running the
Cisco IOS Release 12.2(33)SRB under the following conditions:
When adding or removing the new route-target values under the route-map configuration, which is
being called by the export-map statement under VPN Routing and Forwarding (VRF) configuration.
Workaround: Perform a manual clear of the VRF routing table for the prefixes to be updated.
•
CSCsx33622
Symptoms: Flapping BGP sessions occur in the network when a Cisco IOS application sends
full-length segments with TCP options.
Conditions: This issue is seen when a Cisco IOS device that is configured to send TCP options sends
its initial Maximum Segment Size (MSS) during the three-way handshake. In this case, the router
incorrectly accounts for 20 bytes of TCP options when it sends this initial MSS.
This issue occurs when a "fixed" IOS communicates with a "non-fixed" IOS.
Note
The "non-fixed" behavior is to subtract the 20 TCP option bytes when MSS values are
initially exchanged.
The "fixed" behavior is to not subtract the 20 TCP option bytes when MSS values are
initially exchanged.
Workaround: Set the MSS value on the "non-fixed" router to be the MSS received from the "fixed"
router minus the TCP options (20 bytes). Use the global command ip tcp mss to adjust the MSS
value that the router will use.
•
CSCsx36317
Symptoms: This issue has the following symptoms:
– The downstream traffic in the Cisco uBR10-MC5x20H line card that has no bonding group, but
has a valid fiber node, does not return a value for the docsIf3DsChSetChList MIB.
– The docsIf3DsChSetTable object is not populated even though the channels appear to be
present.
Conditions: This issue is seen on the Cisco uBR10012 running the
Cisco IOS Release 12.2(33)SCB2.
Workaround: Use the show cable mac-domain cable x/y/z downstream-service-group command
to get information about the downstream channel list.
•
CSCsx79870
Symptoms: Modifying the second-choice-channel-width has no affect on the configuration even
though the cable upstream channel-width command accepts the input.
Conditions: This issue is seen in Cisco IOS Release 12.3BC.
Workaround: Modify the first-choice-channel-width, and then reconfigure the first and second
choice.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-23
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsy18380
Symptoms: All CMs on adjacent downstreams are offline. The adjacent downstream ports are 0 and
1, or 2 and 3, or 4.
Conditions: The downstream ports that share JIB may be nonfunctional if the JIB that services both
downstream ports is locked.
Workaround: Reload the cable line card.
•
CSCsy31588
Symptoms: The show interface x/x/x service flow yy phs command does not record payload header
suppression (PHS) packets for upstream.
Conditions: This issue is seen when the PHS is enabled.
Workaround: Use the show cable modem classifier command to get the related classifier counter.
•
CSCsy72009
Symptoms: When attempting to upgrade a Cisco uBR10012 universal broadband router from
Cisco IOS Release 12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the primary PRE may crash.
Conditions: This issue is observed when the Cisco CMTS is running Cisco IOS Release 12.3(21)BC
and while upgrading to Cisco IOS Release 12.2(33)SCB. The CMTS must then be powered down
and physically reconfigured to run as an M-CMTS (Cisco SIP-600 inserted, WB SPAs inserted,
DTCCs inserted, so on.). Finally, the CMTS must be switched on to run its new Cisco IOS Release
12.2(33)SCB IOS image and physical configuration.
Workaround: There is no workaround.
•
CSCta42483
Symptoms: Tracebacks appears while unconfiguring cable service attribute non-ds-bonded
downstream-type bonding-disabled and cable fiber node.
Conditions: This issue occurs when the cable service attribute non-ds-bonded downstream-type
bonding is disabled.
Workaround: There is no workaround.
•
CSCta97561
Symptoms: CPU hog messages are seen when a number of cable modems flap and entry
ccsCmFlapEntry is queried frequently.
Conditions: This issue is seen on the Cisco uBR10012 universal broadband router with the
Cisco uBR10-MC5x20 line card and running the Cisco IOS Release 12.2 (33)SCC.
Workaround: Do not query the ccsCmFlapEntry too frequently when a number of CMs flap.
•
CSCtb09245
Symptoms: Memory fragmentation might occur with memory allocation of 65535 bundle MAC
entry elements.
Conditions: This issue is likely to occur with multicast traffic.
Workaround: There is no workaround.
•
CSCtb33109
Symptoms: Some cable modems (CMs) may go offline during a line card switchover.
Condition: This issue occurs during a switchover of the protect Cisco uBR10-MC5X20H line card
and the working Cisco uBR10-MC5X20U line card.
Workaround: Reduce the number of modems connected to the Cisco uBR10-MC5X20U line card.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-24
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCtb90678
Symptoms: The following symptoms cause very high CPU usage:
– After configuring cable modem remote-query 50 public command, if you use the community
"public" to retrieve ifTable with a speed of 40 tries/ second, it may cause CPU usage to go
beyond > 97%.
– If "snmp-server community private view hccp_chansw_snmp_view RW" is configured on the
Cisco CMTS, but without creating "view hccp_chansw_snmp_view," the SNMP engine uses
almost all CPU timeslots.
Some snmp-related configuration appear automatically and cause high CPU utilization.
Conditions: This issue is seen when an empty or no view is associated to a community.
Workaround: Assoicate a non-empty view to the community or add a rule in the view.
•
CSCtb97382
Symptoms: The wideband association is displayed incorrectly after the cable power is switched off
on all the line cards.
Conditions: This issue is observed when running the following script:
1.
cable power [on | off] 5/0
2.
cable power [on | off] 8/1
3.
cable power [on | off] 5/1
Workaround: There is no workaround.
•
CSCtc01430
Symptoms: If the packetcable feature is not enabled in the CMTS configuration while conducting
the DQoS lite Voice calls, the DiffServ service flows are on the committed information rate (CIR)
queue instead of the low latency queuing (LLQ).
Conditions: This issue occurs on all releases of 12.2(33)SCB.
Workaround: Enable the following commands in the CMTS configuration.
– packetcable
– packetcable authorize vanilla-docsis-mta
•
CSCtc09439
Symptoms: SNMP getmany skips the hwidbiftype check for the wideband cable interface.
Conditions: This issue is seen when the ifSpeed or ifHighSpeed for Wideband cable interfaces and
ifHighSpeed for Integrated cable interfaces is queried.
Workaround: There is no workaround.
•
CSCtc43231
Symptoms: SNMP traps and informs source interface do not work.
Conditions: This issue occurs when the snmp-server trap-source Loopback0 and snmp-server
source-interface informs Loopback0 commands are configured.
Workaround: There is no workaround.
•
CSCtc44253
Symptoms: The modem's accumulated timing-offset goes to a negative value. The following error
message is displayed at the CMTS:
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-25
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
%UBR10000-4-BADTXOFFSET: Bad timing offset -182443 detected for cable modem
000a.73cc.c7b7.
Conditions: This issue occurs on the Cisco uBR-MC5X20D line card.
Workaround: There is no workaround.
•
CSCtc68481
Symptoms: The show inventory command output is not showing the secondary PRE on an
uBR10012 router.
Conditions: This issue occurs on an uBR10012 router running Cisco IOS Release 12.2(33)SCB2.
Workaround: There is no workaround.
•
CSCtc69116
Symptoms: The MIB object snmpwalkoverccsCmFlapTable does not return all the entries.
Conditions: This issue occurs during subsequent reboots where the CMTS does not contain
ifindexes, which are after wideband interfaces (narrowband ifindexes).
Workaround: There is no workaround.
•
CSCtc69860
Symptoms: The following traceback is seen when unconfiguring the bundle interfaces:
Oct 21 23:40:08.951 PDT: %GENERAL-3-EREVENT: No HWIDB_SB_C10K_TT
-Traceback= 60A32A5C 6182EEE0 619159A0 61916248 6019EEFC 601936C0 60198EE0 60AADBB0
60A91CF4 60A9CCA8 609B8940 601384B4 609E4628 60B2E6B8 60B2E6A4
Conditions: This issue occurs when a complicated testing case runs scripts in which all bundle
interfaces are unconfigured.
Workaround: There is no workaround.
•
CSCtc76393
Symptoms: During the ISSU operation, the cable line card upgrade stops after the completion of
PRE RUNVERSION.
Conditions: This issue is seen on a PRE 2 platform upgrade from the
Cisco IOS Release 12.2(33)SCB4 to Cisco IOS Release 12.2(33)SCB6.
This issue is also seen on the downgrade operation from Cisco IOS Release 12.2(33)SCB7 to
Cisco IOS Release 12.2(33)SCB6.
Workaround: ISSU operations on a PRE 2 platform upgrading from
Cisco IOS Release 12.2(33)SCB4 to Cisco IOS Release 12.2(33)SCB6 is not supported.
In this case, perform a system reload.
•
CSCtc78090
Symptoms: The downstream frequency override (DFO) retry counter does not rise beyond the
number zero.
Conditions: This issue occurs when you execute the cable service attribute ds-bonded
downstream-type bonding-enabled [enforce] commands and then power on/off the wideband
cable modem.
Workaround: There is no workaround.
•
CSCtc81968
Symptoms: The MIB object CLAB-TOPO-MIB returns more interface instances compared to the
CLI.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-26
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue occurs under normal conditions.
Workaround: Use CLI instead of SNMP to get the fiber-node information.
•
CSCtc87213
Symptoms: The cable filter group command fails to be displayed in the show running-config
command output.
Conditions: This issue occurs when the cable filter group command was generated.
Workaround: Re-issue the cable filter group command.
•
CSCtc93642
Symptoms: Spurious memory accesses and tracebacks observed after a ping time out.
Conditions: This issue was first observed in Cisco 12.2(33)SCB5 release.
Workaround: There is no workaround.
•
CSCtc94975
Symptoms: Number of pre-equalization taps decreases incorrectly after CLC failover.
Conditions: This issue is observed on a Cisco uBR10012 router running Cisco IOS Release
12.2(33)SCB4 with N+1 redundancy.
Workaround: There is no workaround.
•
CSCtc96090
Symptoms: Polling of the objects IfHCInOctets and IfHCOutOctets stops at the 32-bit point for
cable interfaces.
Conditions: This issue is observed on Cisco uBR10012 routers running
Cisco IOS Release 12.2(33)SCB4.
Workaround: There is no workaround.
•
CSCtd00276
Symptoms: Cisco uBR10000 series router may experience packet drops on PXF when using QoS
and the number of connected customers reach approximately eight thousand subscribers.
Conditions: This issue is observed on Cisco uBR10012 routers running Cisco IOS Release
12.2(33)SCB with QoS enabled.
Workaround: There is no workaround.
•
CSCtd04456
Symptoms: The ENTITY-MIB object returns an incorrect OID value for the DTCC card. This means
that SNMP applications using the ENTITY-MIB object incorrectly classify the DTCC as a TCC+
card.
Conditions: This issue is observed for an SNMP read operation of the ENTITY-MIB.
Workaround: There is no workaround.
•
CSCtd18368
Symptoms: When RF-channel 1 on one controller is shut down, RF-channel 1 on another controller
also automatically shuts down.
Conditions: This issue occurs when the wide band resiliency and cross-controller bonding group are
configured.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-27
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCtd24290
Symptoms: Route processor or Network Processing Engine side memory leak is observed when
querying the MIB object docsIetfQosCmtsMacToSrvFlowTable.
Conditions: This issue occurs when the MIB object docsIetfQosCmtsMacToSrvFlowTable is
queried and there are items returned.
Workaround: Do not query this table, use docsQosCmtsMacToSrvFlowTable and
docsQos3CmtsMacToSrvFlowTable objects.
•
CSCtd28262
Symptoms: Modem is showing init(t) when it should show init(o).
Conditions: This issue occur when the modem is in the process of coming online.
Workaround: There is no workaround.
•
CSCtd28628
Symptoms: Adding a new host in the ACL in the route-map is not effective.
Conditions: The issue was first observed on the Cisco uBR10012 router running Cisco IOS Release
12.2(33)SCB.
Workaround: Modify the route-map configuration (for example, add/ or remove an unrelated set ip
next-hop) whenever a modification is done to the IP access list used by that route-map.
•
CSCtd36723
Symptoms: The show inventory command displays the Cisco UBR10-MC5X20T line card when a
Cisco uBR10-MC5x20H line card is pre-provisioned in the configuration.
Conditions: This issue occurs when the show inventory command is executed during the
pre-configuration of hardware.
Workaround: Use the output of show diag command to determine the installed hardware.
•
CSCtd49070
Symptoms: The protect interface remains in the load balance group table after revertback.
Conditions: This issue occurs after a line card switchover and revertback.
Workaround: There is no workaround.
•
CSCtd58886
Symptoms: The Cisco CMTS crashed when the SNMP client was querying the ifRcvAddressEntry
table.
Conditions: This issue occurs on a Cisco uBR10012 router with a 5-Port Gigabit Ethernet SPA and
“getnext -v2c x.x.x.x(cmts address) [community] ifRcvAddressStatus(or
ifRcvAddressType).11(ifIndex of GE in SPA).6.2.0.0.0.0.160(an non-zero address)” SNMP
command was issued.
Workaround: Do not query this entry of the table.
•
CSCtd64027
Symptoms: The LinkDown SNMP traps are sent twice instead of once causing some Network
Management Systems (NMS) tools to erroneously think the link is still down.
Conditions: This issue occurs when a Wideband SPA or GigabitEthernet interface on the Cisco
uBR10012 router goes down or an attached cable is disconnected.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-28
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCtd67838
Symptoms: The Cisco CMTS may incorrectly attempt to load-balance to a disabled interface.
Conditions: This issue is seen in Cisco IOS Release 12.2(33)SCB5.
Workaround: There is no workaround.
•
CSCtd71795
Symptoms: The cable modem registers with a configuration file, which includes
IPMulticastJoinAuthEncoding sub TLV, but the TLV does not work.
Conditions: This issue is seen on the Cisco unviversal broadband routers running the
Cisco IOS Release 12.2(33)SC.
Workaround: Ensure that there is only one type of GeneralExtensionInformation TLV in the cable
modem configuration file.
•
CSCtd78225
Symptoms: The router displays high CPU utilization for 1 to 2 minutes after issuing privilege
interface commands. As a result, the router takes a long time to reload, after saving the
configuration changes.
Conditions: This issue has been observed while using privilege interface commands on uBR10012
router running Cisco IOS Release 12.2(33)SCB5.
Workaround: Avoid using privilege interface commands.
•
CSCte07585
Symptoms: The standby PRE crashes during the cable modem entry cleanup.
Conditions: This issue is seen on the Cisco uBR10012 (PRE 2) running the
Cisco IOS Release 12.2(33)SCB4.
This issue is seen when there are many cable modems and service flows on the network and there is
congestion between the active and standby Router Processors, which could lead to the IPC packet
drop.
Workaround: There is no workaround.
•
CSCte19290
Symptoms: The PRE crashes after the cable line card is OIR (Online Insertion and Removal) or
crashes.
Conditions: This issue is seen if a bundle member cable line card is removed from the system before
it is removed from the running configuration and causes the active PRE to crash. The is the same
reason for the cable line card crash.
This problem occurs if there is a punted packet associated with the OIR or the crashed interface.
Workaround: Remove the cable line card from the bundle configuration (running configuration)
before the OIR.
•
CSCte19652
Symptoms: The ifSpeed object is not compliant with the RFC specifications.
Conditions: This issue is seen when you query the ifSpeed object by using the SNMP client.
Workaround: There is no workaround.
•
CSCte20910
Symptoms: Memory fragmentation error seen on the Cisco uBR10012 universal broadband router.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-29
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen on the Cisco uBR10012 universal broadband router running the
Cisco IOS Release 12.2(33)SCB4. This issue occurs during normal operation when redundancy
mode is Route Processor Redundancy Plus (RPR+).
Workaround: Configure single sign-on instead of RPR+.
•
CSCte43870
Symptoms: AC bucket array overflows and may corrupt the memory adjacent to admission control
array.
Conditions: This issue is seen under the following conditions:
– AC is enabled
– cable modem has a service flow that is in provisioned state. (25.6 : 1)
– the cable modem is ‘DCC’d by a test command or load balance
Workaround: Ensure that service flows are not in provisioned state (25.6 : 1), else disable the load
balance functionality.
•
CSCte50468
Symptoms: Cannot capture downstream packets on a SIP 600 with a 24 RF channel-spa-1 in bay 1
or bay 2 using a cable monitor.
Conditions: There are no specific conditions for this issue to occur.
Workaround: There is no workaround.
•
CSCte57880
Symptoms: The “service unsupported-transceiver” configuration on a PRE4 is not available.
Conditions: This issue is observed only on PRE running the Cisco IOS Releases 12.2(33)SCB5,
12.2(33)SCC, and 12.2(33)SCD.
Workaround: There is no workaround.
•
CSCte57965
Symptoms: All cable modems on adjacent downstreams (0 and 1, or 2 and 3, or 4) are offline.
Conditions: The downstream ports that share JIB may be nonfunctional if the JIB that services both
downstream ports are locked.
Workaround: Reload the line card.
•
CSCte58329
Symptoms: Layer 2 VPN configuration with BPI configuration failed on the Cisco uBR10012 router.
Conditions: This issue occurs when both Layer 2 VPN and BPI are configured.
Workaround: There is no workaround.
•
CSCte62343
Symptoms: The wideband SPA becomes unusable after a BLAZE SPI interrupt. All cable modems
using SPA downstreams go offline.
Conditions: There are no specific conditions for this issue to occur.
Workaround: OIR the SPA.
•
CSCte63882
Symptoms: The output of the show diagnostic ood-status command does not give correct
information and details about the SPAs and the DTCC cards.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-30
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen when running the Cisco IOS Release 12.2(33)SCB4.
Workaround: There is nor workaround.
•
CSCte78595
Symptoms: The line card reloads due to an error when Layer 2 VPN is configured on the cable
modem.
Conditions: This issue occurs in cable modems when Layer 2 VPN configured and Baseline Privacy
Index (BPI+) not configured.
Workaround: Configure BPI+ on cable modems with Layer 2 VPN configurations.
•
CSCte97135
Symptoms: An IPv4 cable modem with an IPv6 CPE does not forward IPv6 multicast traffic because
theCisco CMTS did not provide the list of DSIDs in the registration.
Conditions: This issue is seen when the cable modem is IPv6 compliant with an IPv6 CPE.
Workaround: There is no workaround.
•
CSCtf13030
Symptoms: The Cisco uBR10-MC5X20H-D cable line card displays incorrect software platform
version group when the show version command is run on the line card or on the MIB walk.
Conditions: This issue is seen on the Cisco uBR10012 universal broadband router while executing
the show version command or MIB walk.
Workaround: There is no workaround.
•
CSCtf19777
Symptoms: Repeated ECC error messages on PRE-4 cause 100% CPU and service interruption.
Conditions: This issue is seen when repeated ECC errors occur.
Workaround: Remove the line card reporting the error to prevent service interruption.
•
CSCtf20276
Symptoms: Load-Sharing of Multiprotocol Label Switching (MPLS)/Virtual Private Network
(VPN) does not happen on the upstream router direction even though the paths have the same cost
to reach a particular destination.
Conditions: This issue is seen when the MPLS/VPN is configured on a bundle interface and the
MPLS is configured on the links to the upstream router.
Workaround: There is no workaround.
•
CSCtf20698
Symptoms: Cable modems get into the init(io) state due to pxf cpu queue wedge.
Conditions: This issue is seen when interface default queues are deleted as the result of a no card
command. This issue is seen on the Cisco uBR10012 universal broadband router running the
Cisco IOS Releases 12.2(33)SCB/SCC/SCD.
Workarounds: If the no card command is executed, the issue can be corrected by performing two
PRE switchovers.
•
CSCtf24696
Symptoms: Core temperature readings are incorrect.
Conditions: This issue is seen on the Cisco uBR10012 universal broadband router with PRE2/3/4
running the Cisco IOS Release 12.2(33)SCB and later.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-31
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCtf31727
Symptoms: Changing the service class parameters on a cable modem results in messages not getting
passed to the PRE.
Conditions: This issue is seen on the Cisco uBR10012 universal broadband router running the
Cisco IOS Release 12.2(33)SCB4.
Workaround: Perform the cable modem service-class-name from the cable line card.
•
CSCtg00983
Symptoms: ISSU downgrade from Cisco IOS Release SCB7 fails. The cable line card reloads and
modems go offline during ISSU run version.
Conditions: This issue occurs when you ISSU downgrade from Cisco IOS Release SCB7 to any
previous Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
Open Caveats—Cisco IOS Release 12.2(33)SCB6
•
CSCsi41966
Symptoms: A cable modem remains in the init(d) state before coming online.
Conditions: This issue occurs when a cable modem (CM) is provisioned using an external DHCP
server. The CM initializes late.
Workaround: Perform a cable card reset.
•
CSCsi63649
Symptoms: All the routers are synchronized to one router and displays the following message every
10 seconds:
Apr 23 13:33:41.929: %SYS-3-TIMERNEG: Cannot start timer (0x7543D68) with
negative offset (-996736100).
-Process= "TTY Background", ipl= 0, pid= 42
Conditions: This issue is observed on certain Cisco gigabit switch routers (GSRs) running Cisco IOS
Releases 12.0(28)S, 12.0(31)S, 12.0(32)S, and 12.0(32)SY.
This issue occurs when a telnet session is initiated on the router, while a new telnet session to a
different device is initiated from the same telnet session.
When you log on to a router through telnet, and then open another telnet session in a different
location, the exec-timeout does not disconnect the session even if no keystrokes are issued. At the
exact moment the timeout expires, the error message is displayed every 10 seconds.
Workaround: Use the show users command to determine which users are logged in through telnet.
Subsequently, use the clear line X command to clear the line, disconnect the users, and stop the error
messages.
•
CSCsv63445
Symptoms: The clear cable modem command does not reset the modular-host tables.
Conditions:
1.
Do not configure any fiber nodes.
2.
Bring some narrow-band modems online from the shared port adapter (SPA) downstream.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-32
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
3.
Use the clear cable modem all reset command to reset the modems.
After you execute this command, all the stat/BPI/PHS indexes in the modular-host tables are
expected to be released, but are not released.
This causes a leak in the stat/BPI/PHS indexes and raises a Cable Modem Transmission System
(CMTS) scalability issue, that is, CMTS is unable to support the stated number of modems online
from the SPA downstream.
Workaround: There is no workaround.
•
CSCsy24676
Symptoms: The file system device returns a pseudo-positive value when the file system fails. This
results in the file operation being displayed as successful even though it failed.
Conditions: This issue occurs when the file system device displays an error, but the code follows the
path in the file system buffer cache, where the error is masked. The device error could occur if the
code was written on damaged media or during online insertion and removal (OIR) of a line card.
Workaround: There is no workaround.
•
CSCsy68856
Symptoms: The active DOCSIS queues remain active in the event of a DOCSIS SPA failure.
Conditions: This issue is observed if there are modems online and passing traffic on the
modular-cable and/or on wideband-cable interfaces and the DOCSIS SPA fails. The DOCSIS queues
associated with these online modems remain active attempting to dequeue.
Workaround: Execute the microcode reload pxf command.
•
CSCsy72009
Symptom: When attempting to upgrade a Cisco uBR10012 router from Cisco IOS Release
12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the primary PRE may crash.
Conditions: This issue is observed when the CMTS is running Cisco IOS Release 12.3(21)BC and
while upgrading to Cisco IOS Release 12.2(33)SCB. The CMTS must then be powered down and
physically reconfigured to run as an M-CMTS (Cisco SIP-600 inserted, WB SPAs inserted, DTCCs
inserted, so on.). Finally, the CMTS must be switched on to run its new Cisco IOS Release
12.2(33)SCB IOS image and physical configuration.
Workaround: There is no workaround.
•
CSCsz22219
Symptoms: The Cisco uBR10000 series PRE2 running the Cisco IOS Release 12.3(23)BC6 crashes.
Conditions: This issue is observed when the PRE2 is running the Cisco IOS Release 12.3(23)BC6
software, enabling ESR-HH-1GE. The cable source-verify dhcp command is executed but no cable
line card is configured or inserted.
This issue occurs in Cisco IOS Releases 12.3(23)BC, 12.3(21a)BC, and 12.2(33)SCB.
Workaround: Configure or insert the cable line card in the Cisco CMTS.
•
CSCsz48174
Symptoms: After a reconfigure of “member subslot x/y working” and switchover of the line card,
the CM does not come online.
Conditions: This issue is observed when you configure “member subslot x/y working” twice.
Workaround: Ensure that you configure “member subslot x/y working” only once.
•
CSCsz49382
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-33
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Cable modems do not respond to layer 3 pings.
Conditions: This issue is observed only on the Cisco uBR10-MC5X20S/U line cards and when
PRE-EQ (equalization-coefficient) is configured.
Workaround: Restart the cable line card.
•
CSCsz50204
Symptoms: A multicast QoS session is not automatically created when changing group
configuration or GQC.
Conditions: This issue is observed when a multicast QoS group is configured on a bundle interface
and a matching static-group is defined. However, any change in the group configuration after it is
applied to the bundle interface is not taken into effect, and the original multicast QoS session is
removed.
Workaround: Remove the multicast QoS session from the bundle interface and re-apply it to the
bundle.
•
CSCsz55288
Symptoms: Alignment traceback messages are displayed when the show memory leak res user and
show buffer usage commands are executed.
Conditions: This issue occurs when the show memory leak res user and show buffer usage
commands are executed in Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsz69357
Symptoms: Memory leak is observed due to SID management task.
Conditions: This issue occurs when the packetcable calls are present.
Workaround: There is no workaround.
•
CSCsz69359
Symptoms: Memory leak is observed on the line card due to MAC parser with overnight PC calls.
Conditions: This issue occurs after making overnight PC calls.
Workaround: There is no workaround.
•
CSCsz77977
Symptoms: OIR of a PCMCIA flash disk can cause a watchdog reset of the PRE.
Conditions: This issue is observed during OIR of the PCMCIA flash disk that is being actively
accessed.
Workaround: Restrict the removal of PCMCIA flash disks.
•
CSCsz98503
Symptoms: Multiple cable modems (CMs) go offline for a short time on a random upstream port.
This is seen as a spike of the error-per-second rate or a modulation error ratio (MER) drop and by a
decrease in the “docsIfSigQUnerroreds” MIB object.
However, the reverse is not true—a brief degradation of the physical connectivity parameters does
not necessarily trigger a brief CM loss.
Conditions: This issue is observed on Cisco uBR10-MC5X20H line cards.
Workaround: There is no workaround.
•
CSCta05835
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-34
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Entries in the objects docsBpi2CmtsMulticastObjects duplicate after the line card
revertback.
Conditions: This issue is observed when a cable match command is configured with BPI. The IGMP
join is received for the group with the cable match command and the objject
docsBpi2CmtsMulticastObjects is populated. This results in the line card switchover and
revertback, and duplicate entries in the object.
Workaround: There is no workaround.
•
CSCta27366
Symptoms: The Cisco uBR10000 PRE CPU utilization rises to 100% when the FPGA on the
Wideband SPAs plugged into a Cisco SIP-600 are being upgraded.
Conditions: This issue only occurs during the SPA FPGA upgrade process.
Workaround: There is no workaround.
•
CSCta32429
Symptoms: The CMs that are not capable of downstream bonding are expected to come online on
downstreams that are not part of a bonding group. Non-bonding capable CMs are wrongly registered
in bonded channels.
Conditions: This issue occurs when the cable service attribute non-ds-bonded downstream-type
bonding-disabled command is configured on the Cisco CMTS.
Workaround: There is no workaround.
•
CSCta38298
Symptoms: Active PRE fails over to the secondary reporting, with the following message:
ACTIVE RP WATCHDOG TIMEOUT TRIGGERED
Conditions: This issue is observed on Cisco IOS Release 12.3(23)BC7.
Workaround: There is no workaround.
•
CSCta39239
Symptoms: While configuring the cable upstream docsis-mode command using SNMP, the
standby PRE module does not synchronize with this configuration.
Conditions: This issue occurs when configuring the cable upstream docsis-mode command using
SNMP.
Workaround: Configure the cable upstream docsis-mode command using the CLI instead of
SNMP.
•
CSCta45075
Symptoms: The show interface multicast-session command may display erroneous multicast
session instances.
Conditions: This issue occurs when:
– you create a matching GQC of type ‘aggregate’ and send IGMP join to two sessions.
– send IGMP leave for Session 1 first and session 2 after 7 seconds.
– rejoin session 2 immediately after Session 1 is deleted.
Workaround: There is no workaround.
•
CSCtb04404
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-35
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: The Cisco Wideband SPA does not transmit traffic. The EQAM indicates no input
traffic.
Conditions: This issue is seen on the Cisco SIP-600 card with a PRE4 module, 5 x1 GigabitEthernet
interface, and SPA-24XDS-SFP Wideband SPAs.
Workaround: Perform a PRE module reload.
•
CSCtb24309
Symptoms: Around 60 to 70 bytes of buffer memory space is allocated when the protect line card
becomes active after a system bootup.
Condition: This issue occurs during a line card switchover.
Workaround: There is no workaround.
•
CSCtb74904
Symptoms: After PRE switchover, the service flow counter shows 0 on the Cisco uBR10012 router.
Conditions: This issue occurs during a PRE switchover.
Workaround: There is no workaround.
•
CSCtb79237
Symptom: No system log or SNMP trap is generated when the COPS process that is used for
packetcable, fails.
Conditions: This issue is observed in a packetcable environment.
Workaround: There is no workaround.
•
CSCtb83278
Symptoms: Executing the term len 0 and show cable modem commands pauses the generated
output randomly for up to a second on a PRE4 module with hundreds of CMs.
Conditions: This issue occurs on PRE4 module with hundreds of CMs.
Workaround: There is no workaround.
•
CSCtb95504
Symptoms: Wideband modems do not come w-online and often flap in Reject(c) state. A telnet into
the line card console and IPC troubleshooting reveals IPC issues, such as failure of the
“ubr-test-request-api x/y block” for other slots.
Conditions: This issue is observed in the Cisco uBR10012 line card with DOCSIS 3.0 Widebandsetup and Wideband-capable modems.
Workaround: Change the Modular-host subslot in the Modular-Controller configuration. We
recommend that you use the Cisco uBR10-MC5X20H-D line cards. These cards provide better CPU
capacity.
You can also reset the hardware-module subslot x/y.
•
CSCtb97382
Symptoms: The Wideband association is displayed incorrectly after the cable power is switched off
on all the line cards.
Conditions: This issue is observed when running the following script:
1.
cable power [on | off] 5/0
2.
cable power [on | off] 8/1
3.
cable power [on | off] 5/1
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-36
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCtc01430
Symptoms: If the packetcable feature is not enabled in the CMTS configuration while conducting
the DQoS lite Voice calls, the DiffServ service flows are on the committed information rate (CIR)
queue instead of the low latency queuing (LLQ).
Conditions: This issue occurs on all releases of 12.2(33)SCB.
Workaround: Enable the following commands in the CMTS configuration.
– packetcable
– packetcable authorize vanilla-docsis-mta
•
CSCtc11757
Symptoms: The write operation fails when a disk card is removed while it is still being updated, or
if a disk card contains bad sectors, or does not respond during updation.
Conditions: This issue is observed in the following two conditions:
1.
The disk card is removed while copying to disk or formatting the disk. If you execute the show
file system, dir disk, or show disk commands during this period, the system hangs.
2.
While copying to disk, you discover that the card contains bad sectors or is not responding.
If you execute the show file system, dir disk, or show disk commands during this period, the
system hangs.
Workaround: For condition 1, avoid removing the card when the card is being updated.
For condition 2, replace the card with a good card.
•
CSCtc13131
Symptoms: ICCN drops and traffic outage are observed on a tunnel with sessions.
Conditions: This issue is observed during bootup or SUP SSO on RFGW.
Workaround: There is no workaround.
•
CSCtc29046
Symptoms: The write operation fails when a disk card is removed while being updated, has some
bad sectors, or does not respond when the card is being updated.
Conditions: This issue is observed in the following two conditions:
1.
The disk card is removed while copying to disk or formatting the disk. If you then execute the
show file system, dir disk, or show disk commands, the system hangs.
2.
During copy to disk operation, it is found that the card has bad sectors or is not responding. If
you then execute the show file system, dir disk, or show disk commands, the system hangs.
Workaround: For condition 1, avoid removing the card when the card is being updated. For condition
2, replace the bad card with a good card.
•
CSCtc33748
Symptoms: The Cisco uBR10-MC5X20S/U/H card crashes multiple times with the following
message in the crashinfo file:
Address Error (load or instruction fetch) exception, CPU signal 10, PC = 0x6038C709
Conditions: This issue is observed on the Cisco uBR10012 router with PRE2 module.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-37
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCtc34682
Symptoms: On a Cisco uBR10000 cable line card, the show memory debug leak command displays
a large number of buffer leaks for SA-MAP request count.
Conditions: This issue occurs when a number of SA-MAP requests are received from multiple
modems connected on the line card.
Workaround: There is no workaround.
•
CSCtc44487
Symptoms: The router crashes in Cisco IOS Release 12.3 (33) SCB, if the Cisco UBR-MC20X20V
card is added or removed from the redundancy configuration.
Conditions: This issue is observed when the line card type is unknown and the line card redundancy
is configured.
Workaround: There is no workaround.
•
CSCtc50422
Symptoms: The internal accounting of the number of MAC domains is incorrect.
Conditions: This issue is observed only on boot up and affects only Cisco IOS Release 12.2(33)SCC.
Workaround: There is no workaround.
•
CSCtc50928
Symptoms: The object docsIfCmtsChannelUtUtilzation is not supported for MC/IC interfaces.
Conditions: This issue occurs when you set the MIB objects
docsIfCmtsChannelUtilizationInterval and ccwbRFChanUtilInterval, and use the SNMP query
for docsIfCmtsChannelUtUtilzation. The results are displayed only for
Cisco uBR10-MC28U/MC5X20 downstream channels.
Workaround: Use the object ccwbRFChannelUtilization for MC/IC interfaces instead.
•
CSCtc54006
Symptoms: Tracebacks occur when the bundle secondary IP address is removed.
Conditions: This issue occurs when you configure and remove the bundle secondary IP address.
Workaround: There is no workaround.
•
CSCtc54875
Symptoms: The Cisco uBR10-MC5X20H line card may crash after reporting memory allocation
failures.
Conditions: This issue is observed when multiple memory allocations fail.
Workaround: There is no workaround.
•
CSCtc55329
Symptom: The redzone of the memory block is corrupted. The following output in the line card
console displays the corruption:
validblock_diagnose, code = 1
current memory block, bp = 0x1FB53398,
memory pool type is Processor
data check, ptr = 0x1FB533C8
Conditions: This issue is observed when the line card is configured for a specific size.
Workaround: Change the configuration of the mac domain.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-38
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCtc55893
Symptom: The init-tech-ovr command in LBG does not work for the second logical channel.
Conditions: This issue is observed when the second logical channel is selected as the source channel.
Workaround: There is no workaround.
•
CSCtc57523
Symptoms: When configuring the IGMP static-group, the CMTS console may hang and eventually
crash.
Conditions: This issue is observed when the group configuration is performed before configuring
the static-group. This may result in the MQoS config process getting into an infinite loop.
Workaround: Configure the static-group before configuring the Group-Config.
•
CSCtc58045
Symptoms: The IGMPv3 client may stop receiving multicast traffic after the leave and rejoin
commands are executed in quick succession.
Conditions: This issue occurs when leave and rejoin commands are executed in a quick succession
before the previous “leave” is executed on the CMTS. Once the modem is in this state, it does not
receive any multicast data even after multiple “leave” and “rejoin” activities.
Work around: Reset the modem and execute a fresh join command.
•
CSCtc59089
Symptoms: The CLC crashes when a specific 3-way call scenario is initiated.
Conditions: This issue occurs where multi-line ATAs are placed behind CMs in a PCMM setup.
Workaround: There is no workaround.
•
CSCtc59813
Symptoms: The ETDB and DSID entries are removed during UBR-MC20X20V line card high
availability.
Conditions: This issue is observed in the Cisco IOS Release 12.2(33)SCC.
Workaround: There is no workaround.
•
CSCtc61474
Symptoms: The line card crashes after executing the show controllers c5/0/4 tech-support
command.
Conditions: This issue is observed on UBR-MC20X20V line cards running the Cisco IOS Release
12.2(33)SCC.
Workaround: There is no workaround.
•
CSCtc61912
Symptoms: A traceback occurs when confirmation-to-receive (CFR) is configured without being
associated with the tunnel.
Conditions: This issue occurs in Cisco IOS Release 12.2(33)SCB.
Workaround: Configure the CFR and associate it with the tunnel using the same command.
•
CSCtc66071
Symptoms: The BPI index information is missing from the show controller command.
Conditions: This issue occurs if the interface is on a functional working or standalone card.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-39
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCtc69116
Symptom: The MIB object snmpwalkoverccsCmFlapTable does not return all the entries.
Conditions: This issue occurs during subsequent reboots where the CMTS does not contain
ifindexes, which are after wideband interfaces (narrowband ifindexes).
Workaround: There is no workaround.
•
CSCtc69339
Symptoms: The operation fails and no DCC is issued when you use the objects
docsLoadbal3ChgOverGroupMacAddress, docsLoadbal3ChgOverGroupUsChSet and
docsLoadbal3ChgOverGroupCommit to change the upstream of a cable modem through SNMP.
Conditions: This issue is observed only when downstream of a cable modem is a Modular Cable or
Integrated Cable interface and its host Cable interface has no frequency configured.
Workaround: Set the object docsLoadbal3ChgOverGroupdownFrequency to the appropriate
target frequency, even if it is identical to the source. Alternatively, if the use of UCC is acceptable,
set the object docsLoadbal3ChgOverGroupForceUCC to TRUE.
•
CSCtc69860
Symptoms: The following traceback is seen when unconfiguring the bundle interfaces:
Oct 21 23:40:08.951 PDT: %GENERAL-3-EREVENT: No HWIDB_SB_C10K_TT
-Traceback= 60A32A5C 6182EEE0 619159A0 61916248 6019EEFC 601936C0 60198EE0 60AADBB0
60A91CF4 60A9CCA8 609B8940 601384B4 609E4628 60B2E6B8 60B2E6A4
Conditions: This issue occurs when a complicated test case runs scripts in which all bundle
interfaces are unconfigured.
Workaround: There is no workaround.
•
CSCtc71311
Symptoms: Attribute-based service flow assignment does not work.
Conditions: This issue is observed when you change the attribute-mask configuration under
wideband-interface after the chassis boots up.
Workaround: Perform a line card switchover and revert back.
•
CSCtc75655
Symptom: The multicast traffic does not pass through the modem in wideband interfaces during line
card switchovers.
Conditions: The issue is observed in the following two conditions:
– When the Wideband interface is in a Cisco UBR-MC20X20V line card.
– When a default multicast QoS group configuration with encryption, but no Group QoS is
configured after line card switchover, traffic does not flow.
The second condition affects all line cards.
Workaround: There is no workaround.
•
CSCtc78090
Symptoms: The downstream frequency override (DFO) retry counter does not rise beyond the
number zero.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-40
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue occurs when you execute the cable service attribute ds-bonded
downstream-type bonding-enabled [enforce] commands and then power on/off the wideband
cable modem.
Workaround: There is no workaround.
•
CSCtc81968
Symptom: The object CLAB-TOPO-MIB returns more interface instances compared to the CLI.
Conditions: This issue occurs under normal conditions.
Workaround: Use CLI instead of SNMP to get the fiber-node information.
•
CSCtc84407
Symptoms: Fiber node is rendered invalid after line card switchover.
Conditions: This issue occurs when a Cisco UBR-MC20X20 line card is acting as protect for
Cisco uBR-MC5X20 line card, and one of the Cisco uBR-MC5X20 line card is in shutdown state
and in fiber node.
Workaround: Ensure that all the Cisco uBR-MC5X20 line cards configured in MD are not in the
shutdown state.
•
CSCtc85234
Symptoms: The multicast DSID may generate incorrectly and multicast traffic does not reach CPE.
Conditions: This issue is observed when line card high-availability (LCHA) is configured and the
static-sync is running.
Workaround: There is no workaround. Once the timer stops (after approximately 30 to 60 seconds
of LCHA operation), the subsequent IGMP join populates the DSID and the forwarding functions
normally.
•
CSCtc92158
Symptoms: After LCHA on the Cisco UBR-MC20X20V line card, multicast traffic fails to reach
CPE.
Conditions: This issue is observed when the CM is MDF enabled after the Cisco UBR-MC20X20V
LCHA.
Workaround: Force the CPE to leave and re-join the group.
•
CSCtc94975
Symptoms: Number of pre-equalization taps decreases incorrectly after CLC failover.
Conditions: This issue is observed on a Cisco uBR10012 router running Cisco IOS Release
12.2(33)SCB4 with N+1 redundancy.
Workaround: There is no workaround.
•
CSCtc96090
Symptoms: Polling of the objects IfHCInOctets and IfHCOutOctets stops at the 32-bit point for
cable interfaces.
Conditions: This issue is observed on Cisco uBR10012 routers running Cisco IOS Release
12.2(33)SCB4.
Workaround: There is no workaround.
•
CSCtd00276
Symptoms: Cisco uBR10000 series router may experience packet drops on PXF when using QoS
and the number of connected customers reach approximately eight thousand subscribers.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-41
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is observed on Cisco uBR10012 routers running Cisco IOS Release
12.2(33)SCB with QoS enabled.
Workaround: There is no workaround.
•
CSCtd04456
Symptoms: The ENTITY-MIB object returns an incorrect OID value for the DTCC card. This means
that SNMP applications using the ENTITY-MIB object incorrectly classify the DTCC as a TCC+
card.
Conditions: This issue is observed for an SNMP read operation of the ENTITY-MIB.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.2(33)SCB6
•
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
•
CSCtb13491
A malformed Internet Key Exchange (IKE) packet may cause a device running Cisco IOS Software
to reload. Only Cisco 7200 Series and Cisco 7301 routers running Cisco IOS software with a VPN
Acceleration Module 2+ (VAM2+) installed are affected. 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-ipsec.shtml.
•
CSCtd81849
Symptoms: File copy from active PRE2 to standby PRE2 may fail or MD5 checksum may fail while
reading a file on the disk.
Conditions: This issue is observed on STI 7.4.0 Compact Flash and PCMCIA Flash cards.
Workaround: There is no workaround.
Open Caveats—Cisco IOS Release 12.2(33)SCB5
•
CSCsi41966
Symptoms: The Cisco uBR10012 router may generate the following message:
UBR10000-6-BADIPASSIGNMENT: DHCPOFFER dropped : Interface Cablex/y/z
Mac abcd.efgh.ijkl SID 2205 L3_Interface Cablex/y/z IP x.y.z.t
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-42
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
already assigned to MAC=mnop.qrst.uvwx Interface Cablex/y/z SID 6367
Conditions: This issue occurs when a cable modem (CM) is provisioned using an external DHCP
server. The CM takes some hours to initialize.
Workaround: Reset the cable card to fix the issue.
•
CSCsi63649
Symptoms: All the routers are synchronized to one router and display the following message every
10 seconds:
Apr 23 13:33:41.929: %SYS-3-TIMERNEG: Cannot start timer (0x7543D68) with
negative offset (-996736100).
-Process= "TTY Background", ipl= 0, pid= 42
Conditions: This issue is observed on some Cisco gigabit switch routers (GSRs) running Cisco IOS
Releases 12.0(28)S, 12.0(31)S, 12.0(32)S, and 12.0(32)SY.
The issue occurs when a telnet session is initiated on the router, and then a new telnet session to a
different device is initiated from the same telnet session.
When you log into a router through telnet, and then open another telnet session in a different
location, the exec-timeout does not disconnect the session even if no keystrokes are issued. At the
exact moment the timeout expires, the error message is displayed every 10 seconds.
Workaround: Use the show users command to determine which users are logged in through telnet.
Then use the clear line X command to clear the line, disconnect the users, and stop the error
messages.
•
CSCsv63445
Symptoms: The clear cable modem command does not reset the modular-host tables.
Conditions:
– Do not configure any fiber nodes.
– Bring some narrow-band modems online from the shared port adapter (SPA) downstream.
– Use the clear cable modem all reset to reset the modems.
After you execute this command, all the stat/BPI/PHS indexes in the modular-host tables are
expected to be freed, but are not freed.
This causes a leak in the stat/BPI/PHS indexes and raises a Cable Modem Transmission System
(CMTS) scalability issue, that is, CMTS is unable to support the stated number of modems online
from the SPA downstream.
Workaround: There is no workaround.
•
CSCsy24676
Symptoms: The file system device returns a pseudo-positive value when the file system fails. This
results in the file operation being displayed as successful even though it failed.
Conditions: This issue occurs when the file system device displays an error, but the code follows the
path in the file system buffer cache, where the error is masked. The device error could occur if the
code was written on damaged media or during online insertion and removal (OIR) of a line card.
Workaround: There is no workaround.
•
CSCsy68856
Symptoms: The active DOCSIS queues remain active in the event of a DOCSIS SPA failure.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-43
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is observed if there are modems online and passing traffic on the
modular-cable and/or on wideband-cable interfaces and the DOCSIS SPA fails, the DOCSIS queues
associated with these online modems remain active attempting to dequeue.
Workaround: Execute the microcode reload pxf command.
•
CSCsy72009
Symptom: When attempting to upgrade a Cisco uBR10012 router from Cisco IOS Release
12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the primary PRE may crash.
Conditions: This issue is observed when the CMTS is running the Cisco IOS Release 12.3(21)BC
and while upgrading to Cisco IOS Release 12.2(33)SCB. The CMTS must then be powered down
and manually reconfigured to run as an M-CMTS (Cisco SIP-600 inserted, WB SPAs inserted,
DTCCs inserted, and so on). The CMTS must then be turned on to run its new Cisco IOS Release
12.2(33)SCB IOS image and physical configuration.
Workaround: There is no workaround.
•
CSCsz22219
Symptoms: The Cisco uBR10000 series PRE 2 running crashes the Cisco IOS Release 12.3(23)BC6.
Conditions: This issue is observed when the PRE 2 is running the Cisco IOS Release 12.3(23)BC6
software, enabling ESR-HH-1GE. The cable source-verify dhcp command is executed but no cable
line card is configured or inserted.
This issue occurs in Cisco IOS Releases 12.3(23)BC, 12.3(21a)BC, and 12.2(33)SCB.
Workaround: Configure or insert the cable line card in the Cisco CMTS.
•
CSCsz48174
Symptoms: After a reconfigure of "member subslot x/y working" and switchover of the line card,
the CM does not come online.
Conditions: This issue is observed when you configure "member subslot x/y working" twice.
Workaround: Ensure that you configure "member subslot x/y working" only once. Do not
reconfigure it.
•
CSCsz49382
Symptoms: CMs do not respond to layer 3 pings.
Conditions: This issue is observed only on the Cisco uBR10-MC5X20S and Cisco
uBR10-MC5X20U cards and when PRE-EQ (equalization-coefficient) is configured.
Workaround: Reset the cable line card.
•
CSCsz50204
Symptoms: A multicast quality of service (QoS) session is not automatically created when changing
group configuration or group QoS configuration (GQC).
Conditions: This issue is observed when a multicast QoS group is configured on a bundle interface
and a matching static-group is defined. However, any change in the group configuration after it is
applied to the bundle interface is not taken into effect, and the original multicast QoS session is
removed.
Workaround: Remove the multicast QoS session from the bundle interface and re-apply it to the
bundle.
•
CSCsz55288
Symptoms: Alignment traceback messages are displayed when the show memory leak res user"
and show buffer usage commands are executed.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-44
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is observed on the Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsz69357
Symptoms: The service identifier (SID) management task results in a memory leak.
Conditions: This issue is observed when the packetcable calls are present.
Workaround: There is no workaround.
•
CSCsz69359
Symptoms: Memory leak is observed on the line card due to MAC parser with overnight PC calls.
Conditions: This issue is observed when the packetcable calls are present overnight.
Workaround: There is no workaround.
•
CSCsz77977
Symptoms: OIR of a PCMCIA flash disk can cause a watchdog reset of the PRE.
Conditions: This issue is observed during OIR of the PCMCIA flash disk that is being actively
accessed.
Workaround: Deactivate the features that access the PCMCIA flash disk. These features include:
– System Event Archive (SEA)
– Docsis 3.0 IPDR (IP Data Record)
– Any file system operation (dir, copy, delete, format, squeeze, more, and so on)
– Any management system automation which accesses the PCMCIA flash disk
It is recommended that you restrict the removal of PCMCIA flash disks to a maintenance window.
If the system has redundant PRE's, then it is further recommended that you remove the PCMCIA
flash disks only from the STANDBY PRE. However, if it is imperative that you remove a PCMCIA
flash disk from the current PRIMARY PRE, then swap the PRE roles by initiating a switchover
before the PCMCIA flash disk removal. Use the redundancy force-switchover main-cpu
command to initiate a PRE switch over:
If SEA or DOCSIS 3.0 IPDR is enabled, verify that no IPDR transactions are in progress by
executing the following command until there is no output:
show cable metering verbose | inc In progress
After the verification, execute the following commands to disable SEA and IPDR:
conf t
no logging system
no cable sflog
no cable metering
end
! Disable SEA
! Disable IPDR sflog writes
! Disable IPDR
Verify that all PCMCIA flash disk accesses have been halted by confirming that the PCMCIA flash
disk access LEDs are not illuminated, before physically removing the PCMCIA flash disk.
•
CSCsz98503
Symptoms: There may be sporadic short losses (of a few minutes) of multiple CMs off a (random)
upstream. These losses are usually accompanied by a spike of the error per second rate or by an MER
drop and a decrease in docsIfSigQUnerroreds.
However, the reverse is not true—a brief degradation of the physical connectivity parameters does
not necessarily trigger a brief CM loss.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-45
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is observed on Cisco uBR10-MC5X20H line cards.
Workaround: There is no workaround.
•
CSCta05835
Symptoms: Entries in docsBpi2CmtsMulticastObjects duplicate after the line card revertback.
Conditions: This issue is observed when a cable match command is configured with BPI. The IGMP
join is received for the group in cable match command and the docsBpi2CmtsMulticastObjects is
populated. This results in the line card switchover and revertback.
Workaround: There is no workaround.
•
CSCta27366
Symptoms: Cisco uBR10000 PRE CPU goes to 100% when the FPGA on the Wideband SPAs
plugged into a SIP-600 are being upgraded.
Conditions: This issue only occurs during the SPA FPGA upgrade process.
Workaround: There is no workaround.
•
CSCta32429
Symptoms: Non-bonding cable modems are wrongly registered in bonded channels.
Workaround: There is no workaround.
•
CSCta38298
Symptoms: Active PRE fails over to the secondary reporting:
ACTIVE RP WATCHDOG TIMEOUT TRIGGERED
Conditions: This issue is observed on Cisco IOS Release 12.3(23)BC7.
Workaround: There is no workaround.
•
CSCta39239
Symptoms: When setting cable upstream docsis mode by SNMP, the standby PRE does not
synchronize this configuration.
Workaround: Use the CLI mode to set up the cable upstream docsis mode instead of SNMP.
•
CSCta45075
Symptoms: The show interface multicast-session command may show erroneous multicast session
instances.
Conditions: This issue occurs when:
– you create a matching GQC of type aggregate and send IGMP join to two sessions.
– send IGMP leave for Session 1 first and session 2 after 7 seconds.
– rejoin session 2 immediately after Session 1 is deleted.
Workaround: There is no workaround.
•
CSCta95686
Symptoms: The standby PRE may crash during initial configuration comprising features, such as
crypto certificates, multicast, and ipv6 configuration.
Conditions: If a configuration file with the above features is copied directly from a file to the running
configuration while both—active RP and standby RP—are booted with no configuration, the
standby RP might reload unexpectedly.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-46
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Ensure that the standby RP is online and available after the initial running
configuration file is saved to the startup configuration file.
•
CSCtb04404
Symptoms: Wideband SPA does not transmit. Harmonic EQAM indicates there is no incoming
traffic.
Conditions: This issue is observed in Cisco IOS Release 12.2(33)SCB3/ PRE 4/ 2 SIP-600's/ 2
5x1GE's/ 6 SPA-24XDS-SFP.
Workaround: Reload the PRE.
•
CSCtb24309
Symptoms: When the protect line-card becomes active for the first time after system bootup, about
60 to 70 buffers are indefinitely, as owned by the "CR10K IPC Dispatcher" process.
Workaround: There is no known workaround for this issue.
•
CSCtb61654
Symptoms: All WCMs on Wideband SPA unexpectedly go offline and never tried ranging.
During this period, the SPA sends out only the SYNC packets, and not packets from MC520 (MDD,
secondary MDD, UCD, MAP, and so on).
Conditions: This issue is observed in 3-Channel bonding with DTI.
Workaround: Online insertion and removal of the SPA might resolve this issue.
•
CSCtb74904
Symptoms: After the PRE switchover, the service flow counter displays the value 0. However, the
right service flow is used to forward the packets. And also the packets will reach CPEs as well.
Conditions: This issue is observed during a PRE switchover.
Workaround: There is no workaround.
•
CSCtb79237
Symptom: No system log or SNMP trap is generated when the COPS process that is used for
packetcable, fails.
Conditions: This issue is observed in a packetcable environment.
Workaround: There is no workaround.
•
CSCtb83278
Symptoms: When you execute the term len 0 and show cable modem commands on PRE 4 with
more than a hundred CMs, printout pauses randomly for up to a second.
Conditions: This issue occurs when there are hundreds.
Workaround: There is no workaround.
•
CSCtb93407
Symptoms: The system logs record a line-card crash (8/0), which is immediately followed by a PRE
failover.
Conditions: There is no query on the object, cefcFRUPowerSupplyGroupTable, when the failover
occurs.
Workaround: There is no workaround.
•
CSCtb95504
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-47
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Wideband modems do not come w-online and often flap in Reject(c) state. A telnet into
the line card console and IPC troubleshooting reveals IPC issues, such as failure of the
"ubr-test-request-api x/y block" for other slots.
Conditions: This issue is observed in the cisco uBR10000-2 line card with Docsis 3.0 Widebandsetup and Wideband-capable modems.
Workaround: Change the Modular-host subslot in the Modular-Controller configuration. It is
recommended that you use the Cisco uBR10-MC5X20H-D line cards. These cards provide better
CPU capacity.
You can also reset the hardware-module subslot x/y.
•
CSCtb97382
Symptoms: The wideband association is displayed incorrectly after the cable power is switched off
on all the line cards.
Conditions: This issue is observed when running the following script:
1.
cable power [on | off] 5/0
2.
cable power [on | off] 8/1
3.
cable power [on | off] 5/1
Workaround: There is no workaround.
•
CSCtc01430
Symptoms: If the packetcable feature is not enabled in the CMTS configuration while conducting
the DQoS lite Voice calls, the DiffServ service flows are on the committed information rate (CIR)
queue instead of the low latency queuing (LLQ).
Conditions: This issue occurs on all Cisco IOS Releases 12.2(33)SCB.
Workaround: Enable the following commands in the CMTS configuration.
– packetcable
– packetcable authorize vanilla-docsis-mta
•
CSCtc10117
Symptoms: The Pool Manager process might result in a memory leak.
Conditions: This issue is observed when QoS is configured.
Workaround: There is no workaround.
•
CSCtc11757
Symptoms: The write operation fails when a disk card is removed while it is still being updated, or
if a disk card contains bad sectors, or does not respond during updation.
Conditions: This issue is observed in the following two conditions:
1.
The disk card is removed while copying to disk or formatting the disk, and you execute the show
file system, dir disk, or show disk commands during this period, the system hangs.
2.
While copying to disk, you discover that the card has bad sectors or is not responding.
If you execute the show file system, dir disk, or show disk commands during this period, the
system hangs.
Workaround: For condition 1, avoid removing the card when the card is being updated.
For condition 2, replace the card with a known good card.
•
CSCtc13131
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-48
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: ICCN drops and traffic outage are observed on a tunnel with sessions.
Conditions: This issue is observed during bootup or SUP SSO on RFGW.
Workaround: There is no workaround.
•
CSCtc25478
Symptoms: With Cisco IOS Release 12.2(33)SCB, multiple next-hop IP addresses are configured in
PBR action. The PBR continues to use the first next-hop IP without switching to the second next-hop
IP even after the first next-hop is shut down and its ARP adjacency in CMTS becomes obsolete.
Conditions: This issue is observed when the first next-hop is down and its ARP adjacency is
removed from CMTS due to timeout.
The interface (on CMTS) connected to the first next-hop is still in "Up" status (for certain
configuration, the interface can become down if the peer is shut down).
Workaround: Configure "PBR Support for Multiple Tracking Options" that is designed to detect
whether the next-hop is active or not. Refer to the PBR Support for Multiple Tracking Options Guide
for more configuration information.
•
CSCtc33211
Symptoms: The modular association with the DS cable controller displays incorrectly. In
show controller cable x/x/x, the modular YY is displayed as "Up," although this association is not
configured under the cable interface.
Conditions: This issue is observed after a stateful switchover (SSO).
Workaround: Perform these steps to recover from this issue:
•
1.
Remove the modular association from cable interface.
2.
Remove and reapply the fiber node configuration.
CSCtc33748
Symptoms: The Cisco uBR10-MC5X20U-D line card crashes multiple times displaying the
following message:
Address Error (load or instruction fetch) exception, CPU signal 10, PC = 0x6038C709
Conditions: This issue is observed on the Cisco uBR10k with PRE2 running Cisco IOS release
12.2(33)SCB3 & SCB4.
Workaround: There is no workaround.
•
CSCtc34682
Symptoms: On a Cisco uBR10000 cable line card, the show memory debug leak command displays
a large number of buffer leaks for SA-MAP request count.
Conditions: This issue occurs when a number of SA-MAP requests are received from multiple
modems connected on the line card.
Workaround: There is no workaround.
•
CSCtc39722
Symptoms: Modems do not come online or once online quickly return to the offline state on
interfaces with modular remote primary.
The show cable modem primary summary total command displays the non-zero blaze indices stay
non-zero:
Conditions: This issue is observed on a PRE-Failover event and when modems are on a domain that
has only modular remote primaries.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-49
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
This issue is observed on Cisco uBR10000 with PRE2 running Cisco IOS Release 12.3(23)BC7.
Workaround: Unplug the power cable off the affected line card and plug it back again.
•
CSCtc44487
Symptoms: The Cisco IOS Release 12.3(33)SCB crashes if the MC-2020 card is added or removed
from the redundancy configuration.
Conditions: This issue is observed when the line card type is unknown and the line card redundancy
is configured.
Workaround: There is no workaround.
•
CSCtc49858
Symptoms: If you have lower privilege levels than Enable Access, you may not be able to execute
some show cable command options.
Conditions: This issue occurs because the parent privilege level is not carried over correctly. This
issue occurs on the Cisco IOS Releases 12.3BC, 12.2SCB, and 12.2SCC CMTS.
Workaround: Repeat the privilege level command for each interface. For the above example,
privilege
privilege
privilege
...
...
privilege
•
exec level 1 show cable mac-domain c5/0/0 downstream-service-group
exec level 1 show cable mac-domain c5/0/1 downstream-service-group
exec level 1 show cable mac-domain c5/0/2 downstream-service-group
exec level 1 show cable mac-domain c8/1/4 downstream-service-group
CSCtc50422
Symptoms: The internal accounting of the number of MAC domains is incorrect.
Conditions: This issue is observed only on boot up and affects only Cisco IOS Release 12.2(33)SCC.
Workaround: There is no workaround.
•
CSCtc50928
Symptoms: docsIfCmtsChannelUtUtilzation is not supported for MC/IC interfaces.
Conditions: This issue occurs when you set the MIB objects
docsIfCmtsChannelUtilizationInterval and ccwbRFChanUtilInterval, and use the SNMP query
for docsIfCmtsChannelUtUtilzation. The results are displayed only for MC28U/MC520
downstream channels.
Workaround: Use the object ccwbRFChannelUtilization for MC/IC interfaces instead.
•
CSCtc54006
Symptoms: Tracebacks occur when the bundle secondary ip address is removed.
Conditions: This issue occurs when you configure and remove the bundle secondary ip address.
Workaround: There is no workaround.
•
CSCtc54875
Symptoms: The Cisco uBR10000-MC5x20H line card may crash after reporting memory allocation
failures.
Conditions: This issue is observed when multiple memory allocations failures occur.
Workaround: There is no workaround.
•
CSCtc55329
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-50
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptom: The redzone of the memory block is corrupted. The following output in the line card
console displays the corruption:
validblock_diagnose, code = 1
current memory block, bp = 0x1FB53398,
memory pool type is Processor
data check, ptr = 0x1FB533C8
Conditions: This issue is observed when the line card is configured for a specific size.
Workaround: Change the configuration of the mac domain.
•
CSCtc55893
Symptom: The init-tech-ovr command in LBG does not work for the second logical channel.
Conditions: This issue is observed when the second logical channel is selected as the source channel.
Workaround: There is no workaround.
•
CSCtc57523
Symptoms: When configuring the IGMP static-group, the CMTS console may hang and eventually
crash.
Conditions: This issue is observed when the Group-config is configured before configuring the
static-group. This may result in the MQoS config process getting into an infinite loop.
Workaround: Configure the static-group before configuring the Group-Config.
•
CSCtc58045
Symptoms: The IGMPv3 client may stop receiving multicast traffic after the leave and rejoin
commands are executed in quick succession.
Conditions: This issue occurs when leave and join commands are sent in a quick succession before
the previous leave is executed on the CMTS. Once the modem is in this state, it will not receive any
multicast data even after multiple leave and joins.
Work around: Reset the modem reset and execute a fresh join command.
•
CSCtc59089
Symptoms: The CLC crashes when a specific 3-way call scenario is initiated.
Conditions: This issue occurs where multi-line ATAs are placed behind CMs in a PCMM setup.
Workaround: There is no workaround.
•
CSCtc59813
Symptoms: The ETDB and DSID entries are removed during MC-2020 LCHA.
Conditions: This issue is observed in the Cisco IOS Release 12.2(33)SCC.
Workaround: There is no workaround.
•
CSCtc61474
Symptoms: CLC crashes after executing the show controllers c5/0/4 tech-support command.
Conditions: This issue is observed on MC-2020 line cards running the Cisco IOS Release
122-32.8.5.SCC.
Workaround: There is no workaround.
•
CSCtc61912
Symptoms: A traceback occurs when confirmation-to-receive (CFR) is configured without being
associated with the tunnel.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-51
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue occurs in Cisco IOS Release 12.2(33)SCB.
Workaround: Configure the CFR and associate it with the tunnel using the same command.
•
CSCtc66071
Symptoms: The BPI index information is missing from the show controller command.
Conditions: This issue occurs if the interface is on working or standalone card.
Workaround: There is no workaround.
•
CSCtc69116
Symptom: The MIB object snmpwalkoverccsCmFlapTable does not return all the entries.
Conditions: This issue occurs during subsequent reboots where the CMTS does not contain
ifindexes, which are after wideband interfaces: narrowband ifindexes.
This issue also occurs if the wideband cables are on the cable flap list.
Workaround: There is no workaround.
•
CSCtc69339
Symptoms: The operation fails and no DCC is issued when you use
docsLoadbal3ChgOverGroupMacAddress, docsLoadbal3ChgOverGroupUsChSet and
docsLoadbal3ChgOverGroupCommit to change a CM's upstream through SNMP.
Conditions: This issue is observed only when the CM's downstream is a Modular Cable or Integrated
Cable interface and its host Cable interface has no frequency configured.
Workaround: Set docsLoadbal3ChgOverGroupdownFrequency to the appropriate target
frequency, even it is identical to the source. Or, if the use of UCC is acceptable, set
docsLoadbal3ChgOverGroupForceUCC to TRUE.
•
CSCtc69860
Symptoms: The following traceback is seen when unconfiguring the bundle interfaces:
Oct 21 23:40:08.951 PDT: %GENERAL-3-EREVENT: No HWIDB_SB_C10K_TT
-Traceback= 60A32A5C 6182EEE0 619159A0 61916248 6019EEFC 601936C0 60198EE0 60AADBB0
60A91CF4 60A9CCA8 609B8940 601384B4 609E4628 60B2E6B8 60B2E6A4
Conditions: This issue occurs when a complicated testing case runs scripts in which all bundle
interfaces are unconfigured.
Workaround: There is no workaround.
•
CSCtc71311
Symptoms: Attribute-based service flow assignment does not work.
Conditions: This issue is observed when you change the attribute-mask configuration under
wideband-interface after the chassis boots up.
Workaround: Perform a line card switch over and revert back to recover from the problem.
•
CSCtc75655
Symptom: The multicast traffic does not pass through the modem in wideband interfaces during
some line card switchovers.
Conditions: The issue is observed in the following two conditions:
– When the Wideband interface is in a Cisco MC-2020 card.
– When a default multicast QoS group configuration with encryption, but no Group QoS is
configured after line card switchover, traffic does not flow.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-52
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
This issue affects all line cards.
Workaround: There is no workaround.
•
CSCtc78090
Symptoms: The DFO retry counter does not rise beyond the number zero.
Conditions: This issue occurs when you execute the cable service attribute ds-bonded
downstream-type bonding-enabled [enforce] and then power on/off the wideband cable modem.
Workaround: There is no workaround.
•
CSCtc78143
Symptoms: The standby PRE may crash with a value of signal 10 after a spurious memory access.
The following message is displayed:
%UBR10K-3-QALLOCFAIL_INFO: Failure to allocate QoS queue: No hardware IDB or sf_datp.
%UBR10K-3-QALLOCFAIL: Failure to allocate QoS queue for service flow 11270, CM
%UBR10K-3-QALLOCFAIL_INFO: Failure to allocate QoS queue: No hardware IDB or sf_datp.
%UBR10K-3-QALLOCFAIL: Failure to allocate QoS queue for service flow 11634, CM
cr10k_rp_ha_parse_ds_srv_flow: DSA sfid 11634 failed to create new sfid
%GENERAL-2-CRITEVENT: Couldn't get C10k Subblock
-Traceback= 60189FD0 6018A008 60197EF8 60196CBC 6034B394 6034AA9C 6034ABE0 6034E4E4
603E3C14 601DF2F4 601E3EB4 601DB628 601DBF50 601DC120 606BFEF8
%ALIGN-3-SPURIOUS: Spurious memory access made at 0x6019BE14 reading 0xBC
%ALIGN-3-TRACE: -Traceback= 6019BE14 6019C7B4 60198460 6019940C 601DE3A4 601DF324
601E3EB4 601DB628
The crash only affects redundancy and has no impact on services.
Workaround: There is no workaround.
•
CSCtc81968
Symptom: The object CLAB-TOPO-MIB returns more interface instances compared to the CLI.
Conditions: This issue occurs under normal conditions.
Workaround: Use CLI instead of SNMP to get the fiber-node information.
•
CSCtc84407
Symptoms: Fiber node is invalid after LCSO for Cisco MC-2020 protect 520.
Conditions: This issue occurs in a MC-2020 protect 520 case, when one 520 MD is in shutdown state
and in fiber node.
Workaround: Ensure that all the 520 MDs configured in MD should not be in shutdown state.
•
CSCtc85234
Symptoms: The multicast DSID may generate incorrectly and multicast traffic does not reach CPE.
Conditions: This issue is observed when LCHA is configured and the static-sync is running.
Workaround: There is no workaround. Once the timer stops (after approximately 30 to 60 seconds
of LCHA operation), the subsequent IGMP join populates the DSID and the forwarding functions
normally.
•
CSCtc92058
Symptoms: The RNG-RSP sends inaccurate timing offset values after the US redirection.
Conditions: This issue is observed when the CM aligns itself to the timing offset according to the
values in the RNG-RSP, but the CMTS does not receive the RNG-request. Therefore, the CM does
not receive any RNG-RSP.
Workaround: Apply the modem firmware patch.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-53
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCtc92158
Symptoms: After LCHA on the Cisco MC-2020 CLC, multicast traffic fails to reach CPE.
Conditions: This issue is observed when the CM is MDF enabled after the 2020 LCHA.
Workaround: CPE should leave and re-join the group.
•
CSCtc94975
Symptoms: Number of pre-equalization taps decreases incorrectly after CLC failover.
Conditions: This issue is observed on a Cisco uBR10000 router running Cisco IOS Release
12.2(33)SCB4.
Workaround: There is no workaround.
•
CSCtc96090
Symptoms: Polling of the IfHCInOctets and IfHCOutOctets wraps at the 32-bit point for cable
interfaces.
Conditions: This issue is observed on Cisco uBR 10000 routers running Cisco IOS Release
12.2(33)SCB4.
Workaround: There is no workaround.
•
CSCtc99509
Symptoms: Cisco Wideband SPA sends only "sync Tx" packets.
Conditions: This issue is observed after Cisco Wideband SPA reload and when a DTI server is used.
Workaround: Reload the jacket card reload EQAM reboot.
•
CSCtd00276
Symptoms: Cisco uBR10000 series router may experience packet drops on PXF complex when
using QoS and the number of connected customers reach approximately eight thousand subscribers.
Conditions: This issue is observed on Cisco uBR10000 series router running Cisco IOS Release
12.2(33)SCB with QoS enabled.
Workaround: There is no workaround.
•
CSCtd04456
Symptoms: The Entity MIB returns an incorrect OID value for the DTCC card. This means that
SNMP applications using the Entity MIB incorrectly classifies the DTCC as a TCC+ card.
Conditions: This issue is observed for an SNMP read operation of the Entit-MIB.
Workaround: There is no workaround.
Resolved Caveats — Cisco IOS Release 12.2(33)SCB5
•
CSCin79116
Symptoms: Executing the show commands pushes the CPU utilization to 100%.
Conditions: Long running show commands, such as show running-config, show voice call
summary, and show memory summary affect voice call processing adversely, even if they
periodically suspend.
Workaround: There is no workaround.
•
CSCsk78448
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-54
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: An error message is displayed when you execute the show pxf cpu stati drop
<interface> command if the interface is not supported by toasters, such as Ethernet, FastEthernet.
Conditions: This issue is observed while executing the show pxf cpu stati drop command on
interfaces, such as Ethernet, FastEthernet, and so on.
Workaround: There is no workaround.
•
CSCsm13892
Symptoms: A traceback occurs when you reset the line cards. The following output is displayed:
RTTY ISSU Start Nego failed: rc: -287
%ISSU-3-NOT_REG_UNDER_ENTITY: msg session(528938704) is not registered under client
ISSU RTTY Client(2033) and entity(1)
-Traceback= ...
Error in rtty_issu_unregister_sessions at 103
%C7600_PWR-SP-4-DISABLED: power to module in slot 2 set off (Reset)
Conditions: This issue occurs after inserting or removing the cards from the chassis, or during an
OIR.
Workaround: There is no workaround.
•
CSCsq70580
Symptoms: A traceback occurs in the cr10k_docsis_get_ses_info for failed assert.
Workaround: There is no workaround.
•
CSCsq71492
Symptoms: A Cisco IOS device may reload with address or alignment errors, and tracebacks, such
as %ALIGN-3-SPURIOUS or %ALIGN-3-TRACE.
Conditions: This issue occurs when the TACACS+ server (ACS) transmits an "authentication error"
during ACS configuration, or when a request times out. There may also be other AAA or
TACACS-related conditions that cause this symptom.
Workaround: There is no workaround.
•
CSCsq75944
Symptoms: A Catalyst 6500 or a Cisco 7600 may reload unexpectedly. On the console or in the RP
crashinfo file, the following message may be displayed:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = Per-Second Jobs
Conditions: This issue occurs when NetFlow is configured on one of the following:
– Cisco 7600 running Cisco IOS Release 12.2(33)SRC
– Catalyst 6500 running Cisco IOS Release 12.2SXH
Workaround: Disable Netflow by using one of the following commands on every sub-interface for
which Netflow is configured:
•
1.
no ip flow ingress
2.
no ip flow egress
3.
no ip route-cache flow
CSCsw78927
Symptoms: A memory leak might occur on a Cisco uBR10000 line card memory leak in the
cr10k_card_ib_ipc_init().
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-55
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsx19200
Symptoms: A CLC may crash when one of its upstreams is shut down.
Conditions: This issue occurs only if the upstream route and its associated downstream are
configured in to load balance groups.
Workaround: There is no workaround.
•
CSCsx47644
Symptoms: Service flow packet drop counters displayed by show int Cableslot/subslot/port
service-flow <sfid> counters are not accurate after a clear counters command has been issued.
Conditions: If a CM service flow has packet drops in toaster (rate-limited and queue drops), these
counters are not cleared on clear counters command causing inaccurate values to be displayed for
these counters by the show int Cableslot/subslot/port service-flow <sfid> counters command.
Workaround: There is no workaround.
•
CSCsx63989
Symptoms: The output "sid" is incorrect in the show cable modem x.x.x.x service-flow [verbose]
command.
Conditions: This issue is observed in the Cisco IOS Release 12.3(23)BC and Cisco IOS Release
12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsx97071
Symptoms: Multicast packets remain unaccounted.
Conditions: This issue is observed when sending multicast traffic. The packets are received properly,
but are not accounted for.
Workaround: There is no workaround.
•
CSCsy14105
Symptoms: The value range of the MIB object ccmtrCollectionInterval is not consistent with the
command. The valid range for a MIB object is 15 to 1440, but 2 to 1440 for the command.
Conditions: This issue occurs while setting the MIB object ccmtrCollectionInterval using the
SNMP set operation.
Workaround: Set the interval using the command.
•
CSCsy19698
Symptoms: A memory leak is observed after executing the multicast test case command.
Conditions: This issue is observed when the cable multicast group-qos and cable multicast qos
group priority commands are unconfigured.
Workaround: Unconfigure the session-range using the cable multicast qos group priority
command.
•
CSCsy41478
Symptoms: The CMTS allows any upstream to be attached to any connector without any warning
message. A "no" is displayed for the conflicting connector.
Conditions: This issue is observed when a new card is plugged into a slot with no pre-configuration.
Workaround: Reload the line card or use default connectors.
•
CSCsy42937
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-56
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Dynamic PCMM service flow disappears after 520U line card switchover or reset.
Conditions: This issue is observed when switchover occurs after PCMM gate built about [T3-20, T3]
seconds or after sequential switchover/revertback.
Workaround: Change the PCMM policy to revive the PCMM gate from COMMIT_RECOVERY
back to COMMIT status.
•
CSCsy55647
Symptoms: The ESR-PRE2 processor module crashes and the crash infomation logs may contain
the following:
%UBR10K-6-US_SFID_INCONSISTENCY: US-SF found: SFID xxxx, type 0, sid 0(yyyy), MAC
aaaa.aaaa.aaaa(bbbb.bbbb.bbbb), prim_sid xxx(yyy)CMD: 'no cable service attribute
voice-enabled downstream-type HA-capable'
Conditions: This issue is observed in the Cisco IOS Release 12.3(23)BC4 and Cisco IOS Release
12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsy57984
Symptoms: The show inventory command on a uBR10012 router running Cisco
IOS Release 12.2(33)SCB1 may show duplicate versions of the DTCC cards in the chassis.
Workaround: There is no workaround.
•
CSCsy66170
Symptoms: After a PRE switchover, the wideband interfaces status on SPA drop offline. The
wideband modems on these wideband interfaces also drop offline.
Conditions: This issue occurs when the primary PRE and secondary PRE boot up at same time.
Workaround: Boot up the secondary PRE much later than the primary PRE, or boot up the secondary
PRE when the primary PRE is already up and running.
•
CSCsz21732
Symptoms: A Cisco router may reload when it is configured for SNMP notifications.
Workaround: Disable the SNMP notifications with the command no snmp-server host
host-address informs.
•
CSCsz32299
Symptoms: Multicast traffic forwarding halts on modular cable interfaces.
Conditions: This issue occurs on modular downstream interfaces with multicast QoS functionality
configured and when the Parallel Express Forwarding (PXF) on the CMTS restarts.
Workaround: In the event of a static multicast, unconfigure and reconfigure the ip igmp
static-group commands. In the event of the dynamic multicast, use the clear ip mroute command.
•
CSCsz62620
Symptoms: During the VDOC video channel changes, it is possible that the multicast QoS service
flow is not created because an outdated multicast QoS service flow exists for 140 seconds after the
last IGMP member. This prevents a new multicast QoS service flow from being created.
Conditions: This issue is observed in multicast QoS service flows.
•
CSCsz73611
Symptom: CMTS will accept inconsistent “per-SF L2VPN TLV” in the cable modem configuration
file.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-57
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This is observed in the following conditions:
– Upstream service flow (US-SF) or downstream Confirmation-to-Receive (DS-CFR)
vendor-specific TLV is specified.
– L2VPN ID is specified in the vendor-specific TLV.
– The VPN ID does not match any of the top-level L2VPN TLV vpnid.
Workaround: There is no workaround.
•
CSCsz91331
Symptoms: When exporting the SAMIS20 scheme data through Internet Protocol Detail Record
(IPDR), the type of RecCreationTime of SAMIS20 scheme is dataTime. The correct value is
dataTimeMsec per CM-SP-OSSIv2.
Conditions: This issue occurs when the cable metering object SAMIS20 is configured before the
IPDR.
Workaround: There is no workaround.
•
CSCsz92211
Symptoms: A legitimate CM which was online and BPI enabled, gets disconnected along with the
following error messages printed with "CLONED_CM_DETECTED" corresponding to legitimate
modem’s MAC address.
Conditions: This issue occurs when once the legitimate CM goes offline and comes back again
online with BPI enabled, the next cloned CM attempt fails.
•
CSCta07643
Symptoms: The show cable modem wideband command displays a wrong MD-DS-SG numerical
value.
Conditions: There is a mismatch between the MD-DS-SG value, CLI show cable modem
wideband, and show cable mac-domain cable */*/* downstream-service-group command values.
SCM wi displays the MD-DS-SG value from the line card and show cable mac-domain cable */*/*
downstream-service-group displays MD-DS-SG from RP.
Workaround: There is no workaround.
•
CSCta15807
Symptoms: Dequeue counts stop incrementing for the queue, the queue fills up and eventually
begins to tail drop. In some instances the entire interface appears stop responding. Often data
corruption messages similar to the following are observed on the system:
%DATACORRUPTION-1-DATAINCONSISTENCY: Doubly-linked list corruption
Additionally, it is possible to sometimes see duplicate QID messages similar to
the following:
%GENERAL-2-CRITEVENT: duplicate qid
Conditions: This issue occurs in the following conditions:
– When an error occurs in the code that returns a qtype from a QID. The result is that the last QID
in the CIR pool (131071) is treated as a best effort QID by some pieces of code, and eventually
returned to the BE-free list instead of the CIR-free list.
– When interface pak priority queues on the CIR active list instead of the BE active list. This
results in issues when the QIDs are eventually freed.
Workaround: Perform two PRE switchovers. This will result in the linked lists of free and active
QIDs on both PREs being completely reset. Ensure that you collect the following data before
performing the switchovers:
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-58
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
show pxf cpu queue hqf stat
show pxf cpu queue [interface]
for interface with the stuck queue (two times to verify the queue
is stuck).
show tech
show tech cmts [interface]
for interface with the affected modem.
show tech cmts modem [mac_address | ip_address]
•
for the affected modem.
CSCta18179
Symptoms: A spurious memory access occurs or CMTS crashes.
Conditions: This issue is observed when the DSG is configured and line card is in protect mode.
Workaround: Do not update the configuration when protect mode is active.
•
CSCta32865
Symptoms: A minor warning message about improper SPA temperature is displayed.
Conditions: This issue is observed when the WBCMTS SPA temperature crosses over the minor
warning threshold of 58C, and remains in the range of 58C ~ 68C for more than 10 minutes.
Workaround: There is no workaround.
•
CSCta37794
Symptoms: The following logging errors may be displayed:
Jun 24 18:44:38.727 CST:%SYS-3-CPUHOG: Task is running for (2000)msecs, more than
(2000)msecs (62/60),process = Exec.
Conditions: This issue is observed on the Cisco MC-520 card. This issue is also observed on the
Cisco IOS Release 12.2 (33)SCB.
Workaround: There is no workaround.
•
CSCta37907
Symptoms: The system is unable to unconfigure the cable metering during the IPDR process.
Workaround: There is no workaround.
•
CSCta39886
Symptoms: The ARP entries are lost after a redundancy switchover or a crash.
Workaround: There is no workaround.
•
CSCta41088
Symptoms: After the line card switchover is reverted back, the wideband modem can only come up
online as a narrow band.
The Blaze index leaks, causing the errors "zero blaze index", and "wbcmts_idxtbl_assign(): failed.
Tbl full".
Conditions: This issue is observed under the following conditions:
– All RF channels on the SPA were configured to be primary downstream channels
– N+1 redundancy is configured
– A multiple line card switchover and revertback is initiated
Workaround: To prevent this issue, type:
hw-module subslot x/y reset
or let the line card crash/power-off/OIR to trigger LCSO/revertback.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-59
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Do not use:
redundancy linecard switchover from / revertback x/y
to trigger LCSO/revertback.
If the issue has occurred, to recover:
•
1.
Failover the modular-host card, then revert it back using redundancy line card.
2.
Remove the modular-host configuration under controller and wait for 15 seconds before adding
it back.
CSCta67740
Symptoms: PC/PCMM gates remain stuck on CMTS after PRE/LC switchover.
Conditions: This issue is observed when the CMTS is running more than 300 PC/PCMM calls and
the PRE/LC switchover is triggered.
Workaround: Manually delete the gates using test packetcable gc gate-delete.
However, There is no workaround in the Cisco IOS Release 23BC, where the above command fails.
•
CSCta68935
Symptoms: After revertback, the show cable modem command displays the CMs under 5/0, but
they do not respond, and the show cable modem <mac-address> command returns with the
message "Cable modem with MAC address xxxx.xxxx.xxxx not registered".
Conditions: This issue occurs when:
1.
5/0 working active, 7/0 protect standby, CM online on 5/0.
2.
lockout 5/0.
3.
hw-module subslot reset 5/0, 7/0 will not become active as 5/0 is locked.
4.
5/0 comes up as active, CM re-online on 5/0.
5.
Unlock 5/0.
6.
LC switchover from 5/0 to 7/0.
7.
LC revertback from 7/0 to 5/0.
Workaround: Clear the CM and bring it back online.
•
CSCta74918
Symptoms: MD-DS-SG ID is set to zero after LC switchover and PRE switchover.
Conditions: This issue is observed when two PREs boot up at the same time.
Workaround: Perform a revertback on the PRE.
•
CSCta79555
Symptoms: The PRE crashes when an Etherchannel subinterface with dot1q encapsultation is
deleted.
Conditions: This issue is observed when there are no more subinterfaces for that Etherchannel
interface.
Workaround: There is no workaround.
•
CSCta84647
Symptoms: The DSG traffic is no longer forwarded to the modular interface after changing the
bundle.
Conditions: This issue is observed when you change the bundle of mac-domain, and only DSG
traffic on MC interface is affected.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-60
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Remove and add the bundle again.
•
CSCta93048
Symptoms: After a crash or a OIR of a cable line card, the RCC template is not applied to the cable
interface.
Conditions: LCHA must be enabled. The initially active card crashes and comes up again to become
active.
Workaround: Unconfigure and re-configure the associated fiber-node when the line card is still in
this state.
•
CSCta93088
Symptoms: If the line card is OIR, the get mib entry command displays an incorrect physical index.
Conditions: This issue is observed when system boots up, and any LC OIR, except SPA.
Workaround: Do not perform an OIR on the line card.
•
CSCta93674
Symptoms: After SFP OIR, the Cisco Wideband SFP physical index is displayed incorrectly and the
name of SFP does not match the show inventory.
Conditions: This issue is observed while performing a Cisco Wideband SFP OIR.
Workaround: Do not perform an OIR on the Cisco Wideband SFP.
•
CSCta98985
Symptoms: The show version command displays an incorrect value (higher or lower) for the SIPs
and SPAs.
Conditions: This issue is observed on the Cisco IOS Release 12.2(33)SCB3/ PRE4/ 2 SIP-600's/ 2
5x1GE's/ 6 SPA-24XDS-SFP.
Workaround: Reload the PRE.
•
CSCtb00253
Symptoms: The CMTS crashes when an IPV6 address is deleted from a client database after sending
bi-directional FTP traffic to ~319 dual-stack CPE devices and then stopping traffic.
Conditions: This issue is observed when the CMTS is configured for only IPv4. A crash occurs in
the CMTS source verify init tables.
Alternatively, if the CMTS is configured for both IPv4 and IPv6 and dual-stack CPEs are used
behind cable modems, a crash occurs when the CMTS internal code deletes an IPv6 address of the
CPE from the CMTS database.
Workaround: There is no workaround.
•
CSCtb00637
Symptoms: When you execute the shutdown command on the Ethernet NSI interface and then
execute the no shutdown command, the TLS L2VPN traffic fails.
Conditions: This issue is observed when the NSI interface is SPA-5X1GE.
Workaround: Unconfigure and re-configure the TLS L2VPN configuration.
For example:
no cable l2-vpn-service xconnect nsi dot1q
no cable dot1q-vc-map 001c.eaa5.0a9e GigabitEthernet1/0/0 17
cable l2-vpn-service xconnect nsi dot1q
cable dot1q-vc-map 001c.eaa5.0a9e GigabitEthernet1/0/0 17
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-61
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCtb04000
Symptoms: Traceback messages are displayed while executing the show interface command.
Workaround: There is no workaround.
•
CSCtb04101
Symptoms: A positive integer value is returned for the MB object docsIfCmtsChannelUtUtilization
(OID 1.3.6.1.2.1.10.127.1.3.9.1.3) of the Cisco uBR10000 5/1 HCCP Protect Interface when it is on
standby.
When a HCCP 5/1 protect card is in standby no traffic utilization should be reported.
Conditions: This issue is observed on the Cisco IOS Release 12.3(23)BC4 running on a Cisco
uBR10000 series router with redundant ESR-PRE2 Modular Cable Docsis 3.0 configurations.
Workaround: There is no workaround.
•
CSCtb12257
Symptoms: On a Cisco uBR10000 series router running Cisco IOS Release 12.2(33)SCC, PRE2.
The following traceback may be seen:
Jul 27 11:13:17.181 CDT: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 10.254.0.1
on interface Bundle1.10
Jul 27 15:26:30.419 CDT: %ALIGN-3-SPURIOUS: Spurious memory access made at 0x613BA3C4
reading 0x37BC
Jul 27 15:26:30.419 CDT: %ALIGN-3-TRACE: -Traceback= 613BA3C4 618CD74C 618E056C
601704E4 60172B8C 60173958 601CD504 601CDA00
Workaround: There is no workaround.
•
CSCtb12487
Symptoms: Unused multicast flows, that is, flows that have no member CMs in the system, can take
a long time to be cleaned up and the IGMP Input process continues to hold large amount of memory.
Conditions: This issue occurs when:
– CMs have joined multiple multicast flows.
– These CMs do not respond to any IGMP queries for the flow, but have not sent IGMP leave for
these flows.
Workaround: There is no workaround.
•
CSCtb16143
Symptoms: When the ip-init mdd command is changed from IPv4 to dual-stack, a traceback may be
observed on the CMTS console.
Conditions: This issues might occur if the CMTS is configured for both IPv4 and IPv6, then going
from IPv4 MDD CLI to dual-stack.
Workaround: There is no workaround.
•
CSCtb30093
Symptoms: The show pxf cpu queue hqf stat command is not included while executing a show
tech-support command.
Workaround: When capturing information with the show tech-support command, also collect
information using the show pxf cpu queue hqf stat command.
•
CSCtb34829
Symptoms: Tracebacks are observed that may be caused by traffic to the CMTS from an unknown
source.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-62
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCtb34844
Symptoms: A DOCSIS 3.0 CM rejects REQ-RSP-MP during modem registration.
Conditions: This issue is observed when the DSID Reseq Wait time 0xff is sent as part of
REQ-RSP-MP as against the DDOCSIS 3.0 MULPI specification specified range of 1-180.
Workaround: There is no workaround.
•
CSCtb42127
Symptoms: Multiple Modular Remote Primary modems report majority or all of the modems offline
because of more than one identical "downstream modular x/y/z rf-channel n" in multiple domains.
Conditions: This issue is observed in the Cisco IOS Release 12.3(23)BC4 with Cisco uBR10000-2
with redundant ESR-PRE2 Modular Cable Docsis 3.0 configurations.
Workaround: Remove the duplicate configurations from the unwanted interface by executing the no
downstream modular command.
You may also need to completely remove the downstream modular configurations on all interface
and reconfigure.
•
CSCtb44889
Symptoms: Change in the cable multicast-echo CLI does not synchronize to the second PRE.
•
CSCtb48785
Symptoms: Remote narrow band eMTAs drop offline after LCSO if the modular-host is on another
card.
Conditions: This issue is observed when:
– The NB eMTAs have Packet Cable call on going
– Dynamic service has the PHS enabled
– The modular-host is configured on another card
– NB eMTAs drop offline only after LCSO
Workaround: Configure modular-host and MD host on the same CLC.
•
CSCtb49984
Symptoms: The message TEK_INVALID_INVALID_KEY_SEQUENCE may display in the logs
and after some time, voice calls using DQoS will fail. At the same time, modems that are reset return
to the online(pk) state and do not progress to the online(pt) state. Messages, such as
UNAUTHSIDTIMEOUT and UNREGSIDTIMEOUT messages also accompany this condition. The
condition only affects a single line card on the CMTS.
Conditions: This issue is observed when the packet buffer memory is full, resulting in upstream
packets not being received. Simultaneously, downstream packets periodically fail to transmit.
Workaround: Disable DQoS and reset the CLC during a maintenance window.
•
CSCtb59002
Symptoms: Voice modems on non-HA-capable downstreams that could not be moved to HA-capable
downstreams, attempt the move process again after its MAC domain host line card does an N+1
switchover.
The modems will go offline, and comeback online on an HA-capable or the non-HA-capable
downstream after the maximum move tries have been exceeded.
Conditions: This issue is observed on the Cisco IOS Release 12.2SC.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-63
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCtb62736
Symptoms: Active PRE crashes when you perform an OIR from a Cisco MC-2020 to a Cisco 520H
line card.
Conditions: This issue also occurs when:
– you perform an OIR between two different types of 520 LC
– the MQoS is running
– the guardian host is configured
Workaround: There is no workaround.
•
CSCtb63881
Symptoms: CGD is lost after LCSO and PRE SO.
Workaround: There is no workaround.
•
CSCtb71251
Symptoms: The active and secondary PREs might crash while attempting to debug a cable DHCP
server, after enabling the logging discriminator.
Conditions; This issue is observed on both the PRE2 and PRE4.
Workaround: Remove the logging discriminator or do not execute the debug cable dhcp command.
•
CSCtb85097
Symptoms: Despite repeated DCC init 3/4 messages, the CMTS continues with its attempts at load
balancing a D3 CM, ignoring the messages.
Conditions: This issue is observed when upstream dynamic LB is configured with DCC init tech 3/4
and the D3.0 modem does not respond to DCC messages.
Workaround: Disable dynamic upstream LB or remove the D3.0 modems that does not respond to
DCC.
•
CSCtb86154
Symptoms: The MIB objects docsQos3ServiceFlowOctets and docsQos3ServiceFlowPkts have
only 32-bit representation capability.
Workaround: Use the docsIetfQosServiceFlowOctets and docsIetfQosServiceFlowPkts to get the
counters.
•
CSCtb86412
Symptoms: When upstream frequency is changed from 35Mhz to 38MHz, cable modem reports
about 7db increment in transmission power.
Conditions: This issue is observed on a Cisco uBR10000 series router with PRE2, and running Cisco
IOS Release 12.3(23)BC4.
Workaround: There is no workaround.
•
CSCtb89936
Symptoms: The LCM dump in PXF crashinfo is empty.
•
CSCtb92591
Symptoms: After a line card switchover, all downstream service flows are deleted.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-64
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCtb93074
Symptoms: The standby PRE4/PRE2 resets/reboots while becoming active after a switch over from
active PRE due to a test crash.
Conditions: This issue is triggered by the following configured commands:
exception core-file R7259CMTS-core
exception dump 1.8.65.30
Workaround: Unconfigure the exception-related configuration before a test crash.
•
CSCtb94325
Symptoms: Some CPEs show the following output after an IOS upgrade to SCB3.
ping to PC from CMTS is OK
ping to PC from Router that is connected to CMTS is failed
ping to CMTS from CPE is failed.
any internet connection from CPE is failed
telnet to CMTS from CPE is OK
'ipconfig/release' and 'ipconfig/renew' is OK, so CPE can be re-assigned IP address
from DHCP server
Conditions: This issue occurs when:
– Cisco IOS Release 12.2.33SCB3 is running
– DTI is used
– cable modem is 3381-based wideband cable modem
– CPE(PC) OS is WinXP
Workaround: Clear the IP ARP <mac-address>.
•
CSCtb98381
Symptoms: A Cisco uBR10000 series router may experience repeated PXF/PRE crashes. The PXF
crashinfo starts with the following message:
PXF DMA Toaster Stall Error
Conditions: The issue is observed when the CMTS is configured with a dotlq DOCSIS l2vpn
configuration.
Workaround: There is no workaround.
•
CSCtb98663
Symptoms: The following system event message is not displayed in the receiving syslog server:
wbcmts_idxtbl_assign(): failed. Tbl full
Conditions: This issue occurs in rare, severe error conditions, which cause the Stats index table to
become full. When this condition persists, other symptoms like modems failing to come online or
falling offline after coming online are observed.
Workaround: There is no workaround.
•
CSCtc02397
Symptoms: The state of external entry keeps flaps in show cable load internal and load may not be
balanced after LCSO.
Conditions: This issue occurs after a LCSO.
Workaround: Do not configure cross-line card load balance.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-65
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCtc03565
Symptoms: WCM on the SPA may go offline after PRESW.
Conditions: This issue is observed when multiple SPAs are present in the system
Workaround: There is no workaround.
•
CSCtc06076
Symptoms: During ISSU with major MDR testing, the following error message and traceback are
observed:
002047: .Sep 17 21:36:10.790:
002048: .Sep 17 21:36:10.790:
002049: .Sep 17 21:36:10.798:
SPA OIR event
-Traceback= 60A263D8 605C41D0
%SPA_OIR-3-OUT_OF_SYNC: bay 1/1: failure code (0x1008)
SPA TSM Error: unrecognized error
%SPA_OIR-3-EVENT_TIMEOUT: bay 1/0: Timeout waiting for
605C3A60 6191751C 605C1DA4 605C43C4 6015F328 6015F480
Conditions: This issue is observed on a Cisco Wideband SIP and running the Cisco IOS Release
12.2(33)SCB.
Workaround: There is no workaround.
•
CSCtc11429
Symptoms: The show interface cable x/y/z cable-monitor cam command displays an incorrect hit
counter on the last upstream when using an interface with eight upstreams.
Conditions: This issue is observed when using cable monitor on an interface that has cable upstream
max-ports set to 8. The hit counters will display 0 for the 8th upstream if cable monitor is not
configured. If it is configured to monitor a cable modem using a mac address on that interface, the
8th upstream shows a random number of hits.
Workaround: There is no workaround.
•
CSCtc15675
Symptoms: Packets are not transmitted on a WB interface in DBS mode, if the last RF channel in
the interface is unconfigured and configured, while there still are untransmitted packets in any of
the packet queues on that interface.
Conditions: This issue is observed in the following conditions:
1.
When the RF channel frequencies are unconfigured and configured in quick succession, while
these channels actively transmit packets.
2.
The RF channel is configured on a wideband bonding group using a copy-paste method. The
channels are added and removed from the group during an active traffic flow.
Workaround: This issue can be prevented at the following two levels:
1.
Controller level– Reconfigure the RF channels with appropriate parameters and do not execute
the no rf-channel x frequency command.
2.
Interface level–Do not remove the last channel in a WB interface while the interface is still up.
However, if the issue has already occurred, execute the micro reload pxf command or perform a
switchover on the standby PRE.
•
CSCtc16159
Symptoms: Service flows are not created for Persistent Gate after a cable modem reset.
Conditions: This issue is observed when cable modem is not BPI enabled.
PCMM persistent gate needs to be set up on the BPI enabled CM. CM should go offline
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-66
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCtc17575
Symptoms: The command cable privacy hotlist cm <a.a.a> 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.
•
CSCtc20177
Symptoms: On a Cisco uBR10000 series router running Cisco IOS Release 12.2(33)SCB4, the
following message may be displayed from one or all CLCs:
SLOT 5/0: Sep 24 10:00:41.586: %ALIGN-3-SPURIOUS: Spurious memory access made at
0x6078B558 reading 0x10
SLOT 5/0: Sep 24 10:00:41.586: %ALIGN-3-TRACE: -Traceback= 6078B558 6078D39C 6078D760
608D2FC8 608BA4A0 608B1E28 608ABEE0 608AC320
Conditions: There is no known condition for this issue.
Workaround: There is no workaround.
•
CSCtc21327
Symptoms: When CMTS sends DBC to delete multicast DSID, the DBC sends with option 0 on
reseq.
•
CSCtc23372
Symptoms: Toaster queue statistics are not displayed by executing the show tech-support
command.
Conditions: This issue is observed in the Cisco IOS Release 12.2(33)SCB.
Workaround: The data can be collected manually by executing the show pxf cpu queue command
for every interface.
•
CSCtc23794
Symptoms: The following symptoms are observed:
– Some wideband cable modems are w-online but do not respond.
– DOCSIS pings to CMs can be done successfully. This results in loss of IP connectivity for the
modems.
Conditions: When the CMTS has been running for a few days, a CM that comes online is assigned
a previously used DSID that has some residual seq-num in the SRAM. This results in using a
non-zero value as a packet sequence number in the DS EHDR of the first packet. Some CMs do not
accept non-zero seq num in first packet.
Workaround: There are two workarounds:
– Reset the SPA. This clears the SRAM memory where DSID and seq-numbers reside.
– Send 1000 packets (for example, ICMP ping) to the modem on the downstream. This causes the
CMTS and CM to synchronize and pings will succeed after that.
•
CSCtc32086
Symptoms: The following log message and traceback are seen in the log:
005279: Oct 1 13:19:57.918 CET: %IPCGRP-3-CMDOP: IPC command 400 (slot1/0):
undersized command response length
-Traceback= 4094109C 409417B8 40B5A51C 40B5AB14 405B5EB8 4055FA08 410F50CC 410F2734
41466D08 4143CE9C 4142B900 4145774C 40A3B7C8 40A3B7B4
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-67
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is observed after a configured wideband SPA is removed and an snmpwalk
of OID 1.3.6.1.4.1.9.9.479.1.1 or the CLI command show hw-module bay all counters rf-channel
is executed.
Workaround: Either replace the WB-SPA or unconfigure the relevant controller modular-cable.
•
CSCtc32349
Symptoms: After running an overnight multicast test, a memory leak is seen at
cr10k_clc_snmp_do_trap on 2020 line card. As a result, continuous IPC tracebacks are seen on the
console and the RP is not able to communicate with the 2020 line card.
Conditions: This issue occurs when:
•
1.
319 CPE join 10 multicast groups.
2.
A test is performed for more than 12 hours.
3.
Multicast traffic is stopped.
4.
Continuous tracebacks are seen on the console, and the RP unable to communicate with the
2020 line card.
CSCtc33526
Symptoms: When the configuration changes the non-primary channel on the peer protect card to
primary channel, and add it to the MD with active mcast sessions, it causes the peer protect card to
crash.
Conditions: This issue is observed when the channel is a non-primary channel on the card, which
means some wideband channel include this RF channel and on the same fiber node with the primary
channels on the card.
Workaround: Tear down the multicast session before changing the configuration and perform the
IGMP join again after the configuration change is done.
•
CSCtc36681
Symptoms: Crash occurs on the CMTS.
Conditions: This issue is observed when the modular-host is changed while the CMTS is running.
Workaround: There is no workaround.
•
CSCtc46436
Symptoms: A PRE-4 line card hangs during boot up, and before a configuration. However, this issue
does not affect all PRE-4 RPs.
Conditions: This issue is observed during the basic booting of PRE-4.
Workaround: There is no workaround.
•
CSCtc54562
Symptoms: An OIR results in a crash.
Conditions: This issue is observed when a PCMCIA card is extracted and inserted back rapidly.
Workaround: Wait for a few seconds after extracting a card or before inserting it back.
•
CSCtc55172
Symptoms: While changing a multicast video channel rapidly, within a short period of time, the
CMTS may reject new IGMP join because of insufficient BW.
Conditions: This issue is observed when a single MQoS SF is used, with larger CIR parameters and
an influx of channel changes.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-68
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Use "aggregate" MQoS SF instead of "Single".
•
CSCtc66442
Symptoms: A CMTS line card occasionally crashes with the traceback pointing to data that corrupts
while performing DBC operation.
Conditions: This issue occurs while executing the clear cable interface command while stress
testing the VDOC and multicast traffic.
Workaround: Do not execute the clear cable interface command.
•
CSCtc75568
Symptoms: If you change the channel-ID of a MAC Domain interface that has modems online, the
modems stop responding.
Conditions: This issue occurs when channel-id in MAC Domain are changed.
Workaround: Do not change channel IDs of MAC Domains when the domains have modems
w-online.
If required, change the channel-IDs of the new MAC Domains on the newly inserted LC before
moving modems to this newly added line card.
•
CSCtc85728
Symptoms: CBT 3.3 Continuous Sweep Function fails after some time when performed on
Cisco uBR10000 series routers with PRE-4 line cards.
Conditions: This issue is observed on the Cisco IOS Release 12.2(33)SCB4. This issue occurs as a
result of the following MIB object returning a value of "10":
CISCO-CABLE-SPECTRUM-MIB::ccsSpectrumRequestTable - ccsSpectrumRequestOperState
Workaround: There is no workaround.
•
CSCtd05813
Symptoms: During the ISSU regression test from SCB 4 to SCB 5, a traceback is observed during
ISSU PRE runversion.
mars#issu runversion B
Conditions: This issue is observed during a regression test where the ISSU upgrade is performed
from an SCB 4 to SCB 5.
Workaround: There is no workaround.
Open Caveats—Cisco IOS Release 12.2(33)SCB4
•
CSCek30621
Symptoms: Wideband modem downstream throughput rate is not yet supported.
Workaround: There is no workaround.
•
CSCsi41966
Symptoms: The Cisco uBR10012 router may generate the following message:
UBR10000-6-BADIPASSIGNMENT: DHCPOFFER dropped : Interface Cablex/y/z
Mac abcd.efgh.ijkl SID 2205 L3_Interface Cablex/y/z IP x.y.z.t
already assigned to MAC=mnop.qrst.uvwx Interface Cablex/y/z SID 6367
Conditions: The cable modem may be stuck in init(d) for some hours before coming online. The
Cable Modems are provisioned by an external DHCP server.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-69
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: If it is not possible to wait for the CM to come up, then a cable card reset will fix the
issue.
•
CSCsl01427
Symptoms: In syntax check mode, if there is a standby in SSO mode, the cts dot1x command does
not work.
Workaround: There are no workarounds.
•
CSCsq45997
Symptoms: The throughput rate shows (slightly) more than the expected range.
Conditions: This happens when the DMIC feature is enabled and the modem is marked with given
maximum rate values. This can also happen when the QoS profile has lower maximum rates.
Workaround: There are no workarounds.
•
CSCsr59753
Symptoms: 12.3(23)BC2 mixed docsis mode (atdma-tdma) can only achieve 40 UGS for an
upstream. But, 12.3(17b)BC9 can achieve 48 UGS flows.
Conditions: Currently, it looks like this may have something to do with mixed mode and modems.
Workaround: There is no workaround.
•
CSCsu00342
Symptoms: Multicast stream drop, after changing the “ip igmp query-interval”. The following show
the output before and after the change:
Before the change:
Router# show ip mroute
<<..skipped..>>
(, ), 01:09:04/00:02:52, flags: sTI
Incoming interface: TenGigabitEthernet1/1, RPF nbr 10.x.x.x, RPF-MFD
Outgoing interface list:
Vlan50, Forward/Sparse, 00:48:45/00:02:52, H <<====
After the change:
Router# show ip mroute
<<..skipped..>>
(, ), 01:28:19/00:02:36, flags: sPT
Incoming interface: TenGigabitEthernet1/1, RPF nbr 10.x.x.x, RPF-MFD
Outgoing interface list: Null <<====
Conditions: The issue is was first seen in a Cisco 7600 chassis with a Supervisor 720 engine running
Cisco IOS Release 12.2(33)SRB.
Workaround: There is no workaround.
•
CSCsu22450
Symptoms: Inactive sessions are observed in the multicast explicit tracking database.
Conditions: This issue is seen when IGMP leave is received for a group followed by a CLC
switchover.
Workaround: There is no workaround.
•
CSCsv11435
Symptoms: When a modem comes up during off-peak time when it is not supposed to be monitored,
as per the enforce-rule configured, the SNMP is not synced to the standby line card.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-70
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen if a line card switchover is done during off-peak time. Even if the
modem enters the peak time, iti s not monitored as per the enforced rule configured. The SNMP is
synced to the standby line card once the modem is monitored during the peak time.
•
CSCsv41886
Symptoms: CMTS crashes and the following error message is seen when the no ip routing or the
no router bgp xx command is run.
%IPRT-3-IPDB_DEL_ERROR: i_pdb delete error bgp, 4, 210074C8, 20E322E0, 0, 0 -Process=
"IP RIB Update", ipl= 0, pid= 117, -Traceback= 0x61FD7F58 0x62005498 0x62006D24
Conditions: A large number of VRFs must be configured and BGP is also configured to support
these VRFs.
Workaround: There is no workaround.
•
CSCsv53276
Symptoms: The show controller modular-cable 1/0/0 command displays that rf-channel 0 becomes
unknown after a SPA hw-module reset.
Conditions: This issue occurred executing the hw-module reset and show diagnostic 1/0/0
commands. This causes all wideband modems also to go online.
Workaround: Reload the router to fix the issue.
•
CSCsv85159
Symptoms: The upstream ports configured as HCCP protect show the port link down when
executing the show facility-alarm status command.
Conditions: This issue is seen when the cable line card is configured as HCCP protect, and the router
is running a later image version than Cisco IOS Release 12.3(23)BC2.
Workaround: There is no workaround.
•
CSCsw14622
Symptoms: For deleted service flows associated with PCMM calls, the last character in the Service
Class Name field is dropped in SAMIS records as well as in the SNMP MIB object
“docsQosServiceFlowLogServiceClassName”.
Conditions: This issue is seen when the dynamic service flows associated with PCMM calls are
deleted. The last character is missing from the service class name in the MIB object
“docsQosServiceFlowLogServiceClassName” and SAMIS records.
•
CSCsw24639
Symptoms: While executing the clear counter command, service flow statistics are not getting
cleared under the wideband interface.
Conditions: This issue is seen in cases of multicast and the forwarding is through the wideband
interface. Multicast service flows are created and the counters are maintained under the wideband
interfaces.
Workaround: There is no workaround.
•
CSCsw33866
Symptoms: Both the working card and protect card are active.
Conditions: This issue is seen when a line card switchover happens from 5/0 to 5/1. After
synchronization, shut down the 5/0/2 interface, and then revert from 5/1 to 5/0. If the 5/0/2 interface
is not shut down, and after the suspend timer interval expires, both 5/0 and 5/1 are active.
Workaround: Do not shut down an active protect interface. If both the cards (working and protect)
are active, reset the protect card.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-71
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsw49188
Symptoms: Cable metering fails and enters a “hung” state.
Conditions: The issue happens when the “ip tcp timestamp” option is configured globally.
Workaround: Do not use the “ip tcp timestamp” option.
•
CSCsw68921
Symptoms: Traffic fluctuation only happens when the WB/MC topology and traffic rate are exactly
the same.
Conditions: This issue is seen in Cisco IOS release 12.2SC with HQF scheduler. When 46 pecent of
bandwidth is allocated to Channel 0 for MC0 and 46 percent of the bandwidth is allocated to
Channel 1 for MC1,the rest of the bandwidth is allocated to WB0.
Thus, the traffic rate of WB is higher than the configured percentage. The traffic rate of MC0 is a
little lower than the configured percentage and the traffic rate of MC1 is a little higher than the
configured percentage.
Workaround: Do the following:
– Change the topology of MC/WB. Combine the two MCs into one.
– Change the percentage of MC/WB.
– Disable dynamic bandwidth sharing.
•
CSCsw76178
Symptoms: During line card high availability, the CM instance bpi_enable flag on the Route
Processor (RP) is not synced over correctly.
Conditions: This issue is seen while generating multicast stream to CMs, and if BPI CM is used
during a line card switchover.
Workaround: There is no workaround.
•
CSCsw78972
Symptoms: The MAC Domain Descriptor (MDD) change message is generated on all the RF
channels globally for any RF channel configured on the CMTS.
Conditions: This issue occurs when an MDD change is supposed to be generated for channels within
the MAC domain.
Workaround: There is no workaround.
•
CSCsw89385
Symptoms: When a Cisco uBR10012 router has a lot of CMs, the show cable modem docsis
version summary command total may not be able to display each column properly because there is
not enough space between columns.
Conditions: This issue is seen when there are a lot of cable modems. This issue is seen in Cisco IOS
Release 12.3(23)BC and Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsw91781
Symptoms: When the cable sync-interval command is configured, the cable interface needs to
execute a shut or no-shut command for the interval change to take effect.
Conditions: This issue occurs while configuring the cable sync-interval command.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-72
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsx16104
Symptoms: The downstream Committed Information Rate (CIR) reservation for wideband cable
modems works as expected, however they are displayed incorrectly under admission control
command.
Conditions: This issue is seen in any w-online state wideband cable modem with non-zero CIR
reservations. It displays the CIR reservation as 0 although the reservation admit or unadmit works
properly. The show interface admission-control reservation downstream command displays the
0 CIR for the wideband CM.
Workaround: Use the show cable modem qos command to display the correct reservation.
•
CSCsx25792
Symptoms: When either Cisco uBR-MC5X20U/S/H card MAC domains have wideband
associations, a traceback may be observed along with a message similar to the following when NO
CARD x/x is used:
*Jan 25 05:41:57.235 PST: %SYS-3-BADLIST_DESTROY: Removed a non-empty list(2F3F7BF4,
name: (unknown)), having 36 elements -Process= "C10K Card Actions", ipl= 0, pid= 75
A small amount of memory leak may also happen. No other side effects are expected.
Conditions: This traceback is seen only if the card had a NB-WB association previously, and was
powered down or removed.
Workaround: There are no workarounds.
•
CSCsx46105
Symptoms: Port-channel interfaces used in conjunction with 802.1q subinterfaces show a number
of problems on both the PRE4 and PRE2 processor modules. This was observed while testing the
Cisco SPA-5X1GE-V2 in Cisco IOS Release 12.2(33)SCB. The problem appears to be with the
4-jacket WAN interface, and not with the older half-height Gigabit Ethernet interfaces.
Conditions: This issue occurs in a PRE2 processor module under the following conditions:
– Any change to member links (adding or removing or executing the shut or no shut commands)
requiring that the port-channel subinterface be deleted and reconfigured.
– A reload of CMTS requiring that port-channel subinterface be deleted and reconfigured to
restore traffic.
This issue occurs in a PRE4 processor module under the following conditions:
– A reload of CMTS requiring a PXF microcode reload in order to restore traffic over
port-channel subinterface.
– The show pxf cpu statistics drop command shows “fib rpf” fails under the interface
port-channel interface.
Workarounds: To restore the traffic, do the following:
1.
Copy the configuration of the port-channel and the VLANS.
2.
Delete the port-channels.
3.
Edit the configuration to configure Gigabit Ethernet interfaces in a port-channel, before
configuring VLAN subinterfaces.
4.
Paste the edited configuration in the CMTS.
Theoretically, you can boot the CMTS with no Ethernet channel configured, and copy an edited
production configuration file to running-config after all the interfaces are up.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-73
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsx49779
Symptoms: The w-online state modem comes online after protect line cards are reset before a
resynchronization.The CMTS is configured with N+1 redundancy. If the working line card (7/0) is
reset, the modem switches to protect (5/0). If the protect (5/0) line card is reset before
resynchronization, the modem disappears, and comes in online instead of being in the w-online
state.The clear cable modem reset command does not work to bring the modem back to the
w-online state.
Conditions: This issue occurs while resetting an active line card during the standby line card bootup
period, but before the static synchronization of an active to standby line card finishes.
Workaround: Reload the line card or the CMTS.
•
CSCsx50104
Symptoms: An IRONBUS_FAULT is displayed while pulling out the Cisco SIP-600.
Conditions: This issue is seen in Cisco IOS Release 12.2(33)SCB image running on a Cisco
uBR10012 router.
Workaround: There is no workaround.
•
CSCsx50120
Symptoms: A spurious memory access was observed on a cable line card when Online Insertion and
Removal (OIR) of the Cisco SIP-600 was done on a PRE 4 processor module.
Conditions: This issue is observed on PRE 4 processor module with an active wideband SPA.
Workaround: There is no workaround.
•
CSCsx54139
Symptoms: The show cable bundle multicast command does not display the entire bundle in the
interface column.
Conditions: This issue is seen in the output of the show cable bundle multicast command.
•
CSCsx54955
Symptoms: Multimedia Terminal Adaptor (MTA) CMs are not accessible from the CMTS or
Internet because the ARP entry is replaced with an all-zero MAC address. Hence it is not accessible
when a crafted packet is sent.
Conditions: This issue occurs when a crafted packet is sent to the CMTS, causing the CMTS to use
the wrong MAC address for the ARP table.
Workaround: Execute the cable source-verify dhcp server x.x.x.x command, where x.x.x.x is your
DHCP server, and use cable arp filter to limit the potential ARP storm.
•
CSCsx56465
Symptoms: Wideband CMs using a stats index are not managed by the modular-host. This causes
two modems using the same Blaze header stats index, thus leading to incorrect downstream traffic
statistics on these modems.
Conditions: This issue occurs when there are wideband modems in the w-online state and a change
is made to the downstream channel ID of the MAC domain host of these wideband modems.
Workaround: There is no workaround.
•
CSCsx63989
Symptoms: The output of “sid” is incorrect in the show cable modem x.x.x.x service-flow
[verbose] command.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-74
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen in Cisco IOS Release 12.3(23)BC and Cisco IOS Release
12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsx72877
Symptoms: Traceback and IPC error messages may appear after the CMTS is loaded with the Cisco
IOS Release 12.2(33)SCB1 image.
Conditions: This issue is seen in routers running Cisco IOS Release 12.2(33)SCB1.
Workaround: There is no workaround.
•
CSCsx74271
Symptoms: The show pxf cable multicast-echo does not display the entire interface when the
subinterface is greater than 13 characters.
Conditions: This issue is seen for subinterfaces greater than 13 characters.
•
CSCsx79870
Symptoms: Modifying the second-choice-channel-width has no affect on the configuration even
though the cable upstream channel-width command accepts the input.
Conditions: This issue is seen in Cisco IOS Release 12.3BC.
Workaround: Modify the first-choice-channel-width, and then reconfigure the first and second
choice.
•
CSCsx80616
Symptoms: The packet drop counter is not getting updated in show interface service-flow counter
for single-session multicast service-flows
Conditions: This issue is seen in single session multicast service-flows.
•
CSCsx93455
Symptoms: No multicast-session is permitted when cable multicast authorization profile (mauth) is
enabled and the debug messages display “session limit reached”.
Conditions: This issue is seen in the following conditions:
– The CM comes online with max-session-zero cm-file
– Resetting the CM again with a non-mauth cm-file
– Enabling cable multicast authorization profile on CMTS
– Sending MLD/IGMP join matching default profile
– Session not being permitted irrespective of max-session limit and default action configured on
the CMTS
Workaround: Delete the cable modem and allow the modem to come online with second cable
modem configuration (non-mauth cm-file).
•
CSCsx97465
Symptoms: The CMTS may initiate DCC/DSA/DSC when Dynamic Bonding Change (DBC) is
outstanding.
Conditions: If the customer is running Video over DOCSIS (VDOC) and Cisco Load Balancing (or
CMTS initiated DSA) with a DPC3000, the CMTS makes VDOC higher priority over load balancing
(or CMTS-initiated DSA) when a DBC is outstanding. According to DOCSIS 3.0 specifications, the
CMTS must not issue a DCC or DSA/DSC command when it has previously issued a DBC command
and that command is still outstanding.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-75
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsx97488
Symptoms: CMTS does not reject the CM-initialized DSC/DSA messages during Dynamic Bonding
Change (DBC) or Dynamic Channel Change (DCC).
Conditions: This issue is seen if the customer is running Video over DOCSIS (VDOC) with a Cisco
DPC3000 cable modem, and the CM is making a DSA call. The CMTS responds with a confirmation
code of “reject-temporary” for the DSA-REQ or DSC-REQ for Annex B.
Workaround: There is no workaround.
•
CSCsy05768
Symptoms: After issuing the no cable trust command on the active PRE module, that same
command is not removed from the standby PRE module and as a result the active and standby PRE
modules are out of sync.
Conditions: This behavior is only seen if the MAC address used in the cable trust command does
not exist in the CMTS.
Workaround: There is no workaround.
•
CSCsy07513
Symptom: Traffic does not resume after a PRE module switchover and modems are not accessible
after a PRE module switchover.
Conditions: This issue occurs after a PRE module switchover and “cef”is not running in the standby
PRE module.
Workaround: There is no workaround.
•
CSCsy09588
Symptoms: After unconfiguring the cable source-verify dhcp command, the “SrcVfy” field
continues to display “On”.
Conditions: This is seen when the cable ipv6 source-verify and cable source-verify dhcp
commands are configured on the same bundle interface, and when the cable source-verify dhcp
command is unconfigured before the cable ipv6 source-verify command.
•
CSCsy13870
Symptoms: When configuring cable upstream threshold cnr-profile snr-profile, the parser shows
and accepts the second threshold value. It does not give an error message, and does not display the
configuration with only the first threshold value.
Conditions: This issue is seen while configuring the CNR and SNR thresholds for modulation
profiles.
Workaround: Either enter any valid threshold value or “0” to bypass.
•
CSCsy14105
Symptoms: The value range of the MIB object “ccmtrCollectionInterval” is not consistent with the
command. The valid range for MIB object is 15 to 1440, but for the command, the range is 2 to 1440.
Conditions: This issue occurs while setting the MIB object “ccmtrCollectionInterval” using the
SNMP set operation.
Workaround: Set the interval using the command.
•
CSCsy14569
Symptoms: A memory leak was observed after deleting the subinterface.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-76
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen while deleting a subinterface.
Workaround: There is no workaround.
•
CSCsy16511
Symptoms: When applying modulation profiles to an upstream port, the modulation profiles are
re-ordered, high performance to robust/low performance. Modifying the order of the
modulation/symbol rate on the profile does not happen.
Conditions: If the signal-to-noise ratio (SNR) threshold is set at 25 with a hysteresis of 2 (bypassing
all FEC), the modulation on the upstream will be QPSK until the SNR falls below 25 dB where it
will change to 16-QAM. When the SNR reaches 27 dB (25 dB + 2 dB), the modulation reverts to
QPSK. When a line card switchover is performed, the modulation profiles are re-ordered on the
protect card.
Workaround: Remove and re-apply modulation-profile configuration on the upstream port after
modifying the modulation profiles.
•
CSCsy19698
Symptoms: A memory leak was observed after executing the multicast test case.
Conditions: This issue is seen when the cable multicast group-qos and cable multicast qos group
priority commands are unconfigured.
Workaround: First unconfigure the session-range using the cable multicast qos group priority
command.
•
CSCsy20664
Symptom: Removing the line card configuration causes %LINEPROTO-5-UPDOWN and scm sum
total, scm vendor sum, and scm show modem commands show no CMs.
Conditions: This is seen when line card high availability is removed and while executing scm sum
total, scm vendor sum. and scm show modem commands.
Workaround: There is no workaround.
•
CSCsy21280
Symptoms: PXF forwards traffic up to 300 Mbps to the Route Processor (RP) using 1500-byte IPv6
packets.
Conditions: This issue occurs when Physical Logical Bandwidth Limiting Traffic (PBLT) for the RP
CPU queue is set to 300 Mbps. The show pxf cpu queue command displays this information.
Workaround: Change the value to 44 Mbps (DS3 Bandwidth) for the PRE2 processor module and
1.6 times 44 Mbps for the PRE4 processor module.
•
CSCsy23149
Symptoms: The MIB object “entPhysicalName” for theCisco uBR10012 router does not display the
values correctly. The values as displayed as slot 0/0/0 and slot 0/1/0 for the PRE processor modules
instead of being displayed as 0A and 0B from left to right. Similarly, the MIB object
“entPhysicalName” returns slot x/x/x (for example, 1/0/0) instead of the values displayed in the
device.
Conditions: This issue occurs while querying the MIB object “entPhysicalName”.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-77
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsy33496
Symptoms: When applying new RF channels in Cisco IOS Release 12.2(33)SCB, a corresponding
modular-cable interface is created. These interfaces appear under router RIP, router OSPF, and
router isis routing protocol processes as “no passive-interface”, even when passive-interface
default is configured. Cable, modular-cable, and wideband interfaces should not appear under a
routing protocol process as there is no Layer 3 control.
Conditions: The creation of new cable bundle interfaces is configured rightly using the
passive-interface default command. Because there is no Layer 3 control on cable, modular-cable,
or wideband cable interfaces, such a problem with the Layer 2 interfaces appearing as “no
passive-interface” does not lead to improper routing protocol control, but this can create some
confusion even though the issue is cosmetic.
•
CSCsy37677
Symptoms: A crash is observed on the CMTS.
Conditions: This issue is seen in cases ETDB show commands are paused and multicast sessions
removed because a CPE leave or a CM goes offline.
Workaround: Set the term length to 0 for no pausing while displaying the command.
•
CSCsy41357
Symptoms: The following configuration on the uBR10000 Series Universal Broadband Routers
(PRE-2) can cause a system reload on both the primary and standby.
ip access-list extended CABLEIN
deny udp A.0.0.0 0.255.255.255 B.C.D.0 0.0.0.255 eq tftp log
deny tcp A.0.0.0 0.255.255.255 B.C.D.0 0.0.0.255 eq 69 log
permit ip any any
Workaround: There is no workaround.
•
CSCsy41478
Symptoms: The CMTS allows any upstream to be attached to any connector without any warning
message. A “no” is displayed for the conflicting connector.
Conditions: This issue is seen when a new card is plugged into a slot with no pre-configuration.
Workaround: Reload the line card or use default connectors.
•
CSCsy42532
Symptoms: The range for Security Association Identifier (SAID) is not correct. The correct range
should be 8192 to 12272.
Conditions: This issue is seen in routers running Cisco IOS Release 12.2(33)SCA.
•
CSCsy42937
Symptoms: Dynamic Packetcable Multimedia (PCMM) service flow disappears after Cisco
uBR-MC5X20U line card switchover or reset.
Conditions: This issue is observed when switchover occurs after PCMM gate built about [T3-20, T3]
seconds or after sequential switchover/revertback.
Workaround: Change PCMM policy to rescue PCMM gate from COMMIT_RECOVERY back to
COMMIT status.
•
CSCsy54558
Symptoms: The PRE4 processor module rate shaping allows the traffic throughput on a service flow
to exceed its maximum rate.
Conditions: This issue is seen on PRE4 processor module best effort service flows.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-78
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsy55647
Symptoms: A crash is observed on the ESR-PRE2 processor module. The crash infomation logs may
contain the following:
%UBR10K-6-US_SFID_INCONSISTENCY: US-SF found: SFID xxxx, type 0, sid 0(yyyy), MAC
aaaa.aaaa.aaaa(bbbb.bbbb.bbbb), prim_sid xxx(yyy)CMD: 'no cable service attribute
voice-enabled downstream-type HA-capable'
Conditions: This issue is seen in Cisco IOS Release 12.3(23)BC4 and Cisco IOS Release
12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsy57984
Symptoms: The show inventory command on a uBR10012 router running Cisco
IOS Release 12.2(33)SCB1 may show duplicates of the DTCC cards in the chassis.
Workaround: There is no workaround.
•
CSCsy59457
Symptoms: After a reload, cable metering source-interface FastEthernet0/0/0 is not present at the
running configuration, although cable metering filesystem disk0: cpe-list-suppress and cable
metering source-interface FastEthernet0/0/0 were configured.
Conditions: This issue is seen only in Cisco IOS release versions on the PRE2 processor module.
Workaround: There is no workaround.
•
CSCsy68856
Symptoms: The active DOCSIS queues remain active in the event of a DOCSIS SPA failure.
Conditions: If there are modems online and passing traffic on the modular-cable and/or on
wideband-cable interfaces and the DOCSIS SPA fails, the DOCSIS queues associated with these
online modems remain active attempting to dequeue.
Workaround: There is no workaround.
•
CSCsy72009
Symptom: When attempting to upgrade a Cisco uBR10012 router from Cisco IOS Release
12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the primary PRE may crash.
Conditions: This issue is seen when the CMTS is running Cisco IOS Release 12.3(21)BC and while
upgrading to Cisco IOS Release 12.2(33)SCB. The CMTS must then be powered down and
physically reconfigured to run as a M-CMTS (Cisco SIP-600 inserted, WB SPAs inserted, DTCCs
inserted, so on.). Lastly, the CMTS must be turned on to run its new Cisco IOS Release 12.2(33)SCB
IOS image and physical configuration.
•
CSCsy72030
Symptoms: The RFGW-1 reports channel(s) as down following rf-channel and fiber node
configuration changes.
Conditions: This issue is seen when there are changes made to the rf-channel/fiber node
configuration on the RFGW-1. It reports the affected channels as DOWN.
Workaround: Exit fiber node configuration level and the changes are be committed and the
rf-channel status as reported by the RFGW-1. It shows the correct state.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-79
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsy79526
Symptoms: Modems marked by tftp-enforce mark-only show up in show cable modem as marked
with the # sign. Syslog messages might report that the modem was marked as follows:
SLOT 6/1: Mar 25 12:21:58.967 CDT: %UBR10000-4-REGISTRATION_BEFORE_TFTP_MARK:
Registration request unexpected: Cable Modem did not attempt TFTP. Modem marked with
#. CM Mac Addr
But the modem does not show up with the “#” in front of the online status in show cable modem
command.
Conditions: This is seen in routers running Cisco IOS Release 12.2(33)SCB1.
Workaround: There is no workaround.
•
CSCsy81688
Symptoms: The show facility-alarm status command displays a false alarm.
Conditions: This issue is seen for the protect line cards when connectors are not set.
Workaround: There is no workaround.
•
CSCsy86273
Symptoms: When a bundle subinterface number is greater than 64K, the statindex assignment for
multicast session shows 0.
Conditions: This is a rare situation and only happens when a subinterface number is greater than
64K.
Workaround: Use a smaller subinterface number.
•
CSCsy90276
Symptoms: The CMTS sends DBC to the CM to change the primary downstream port
Conditions: This issue is seen when the VDOC broadcast feature is configured such that multiple
RCCs in the same MAC domain have exact same frequencies for the primary bonding group, but the
primary frequency is different. For example, if you have frequencies f1 and f2 as the primary
bonding group frequencies, then rcc1 (f1f2f3) and rcc2 (f1f2f4) have the first two frequencies as
f1f2, while rcc3 (f2f1f3) and rcc4 (f2f1f4) have the first two frequencies as f2f1. With this
configuration, the CM is first online using rcc3 and the CPE sends an IGMP join for the channel
corresponding to f3.
Workaround: For the VDOC broadcast feature, configure RCC templates such that a set of primary
bonding group frequencies are in the same order in all RCC templates.
•
CSCsy93204
Symptoms: Executing the cmts walk command on ARP table causes high CPU utilization. This is
also seen while using the snmp walk command on the ARP table.
Conditions: This issue occurs while using the cmts walk and snmp walk commands.
Workaround: To prevent high CPU utilization when using the snmp walk command, use snmp view
commands:
snmp-server view cutdown iso included
snmp-server view cutdown at excluded
snmp-server community public view cutdown ro
snmp-server community private view cutdown rw
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-80
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsz02935
Symptoms: Although the CM is in non-BPI mode, after line card high availability, its downstream
packet or the ping are still encrypted and fail.
Conditions: This issue is seen in the following conditions:
– System has line card high availability configured, BPI setup and he CM is online (pt) or
w-online (pt).
– Change the CM configuration file to non-BPI.
– Reset the CM using the delete command.
Workaround: After the change to non-BPI configuration, use the delete command instead of reset.
•
CSCsz03046
Symptom: The CM goes offline after line card fails with different types of working and protect line
card (for example, Cisco uBR10-MC5X20H protect and Cisco uBR10-MC5X20U line cards)
Conditions: This issue occurs when a manual line card switchover is done and when a new active
line card crashes or reboots before HCCP Static Sync is done.
Workaround: There is no workaround.
•
CSCsz13151
Symptoms: The show interface bundle command output displays incorrect upstream input bit/sec
traffic counter.
Workaround: There is no workaround.
•
CSCsz20582
Symptoms: After a line card switchover the key-index becomes 0 for a multicast QoS that is
configured for a active static IGMP session along with encryption.
Conditions: This issue is seen only for static IGMP groups which has multicast QoS with encryption
configured.
Workaround: There is no workaround.
•
CSCsz20999
Symptoms: An unused Downstream Service Identifier (DSID) and statsindex is shown in the show
cable multicast dsid command. The Service Flow Identifier (SFID) value displays “0” in the show
interface multicast-session command.
Conditions: This happens when admission control checks fails at the cable line card (CLC) during
multicast service flow creation.
Workaround: There is no known workaround.
•
CSCsz21551
Symptoms: Cable modems report non-primary DS channel impairments during registration time via
the partial-service in the REG-ACK message.
Workaround: There is no workaround.
•
CSCsz24175
Symptoms: A uBR10012 router may see the following syslog generated repeatedly:
%UBR10000-6-MAP_UPSTREAM_BW_ALLOCATION: A transmit opportunity was missed because MAP
arrived too late
Workaround: There is no known workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-81
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsz24317
Symptoms: Service flow statistics wrongly resets to 0 after executing the dcc technique 1
command.
Workaround: There is no known workaround.
•
CSCsz25605
Symptoms: The Gigabit Ethernet interface on an ESR-1GE may fail to send packets.
Conditions: This might be seen just after executing online insertion and removal (OIR) of an
ESR-1GE with low rate.
Workaround: Execute the hw-module slot reset command.
•
CSCsz26989
Symptoms: The multicast packets are forwarded to a cable downstream interface that is in
rf-shutdown state.
Conditions: This issue occurs if the cable interface is in rf-shutdown state and multicast traffic is
forwarded to that interface unnecessarily.
Workaround: There is no workaround.
•
CSCsz32299
Symptoms: Multicast traffic forwarding stops on modular cable interfaces.
Conditions: This issue occurs on modular downstream interfaces with multicast QoS functionality
configured and the Parallel Express Forwarding (PXF) on the CMTS has restarted.
Workaround: In case of a static multicast, unconfigure and reconfigure the ip igmp static-group
commands. In case of dynamic multicast, use the clear ip mroute command.
Workaround: There is no workaround.
•
CSCsz35258
Symptoms: When using the RCC template with multiple channels marked as primary, the cable
modem will see sporadic downstream traffic loss depending on the modem’s selection of the primary
downstream.
Conditions: The cable modem must be locked on to the primary downstream that is not RC-1 in the
RCC template.
Workaround: Assign only a single RC/DS as primary per RCC-template.
•
CSCsz35321
Symptoms: Index allocation might fail due to an IPC drop between the host and the working line
card, or because the guardian is down.
Workaround: Reset the line card, guardian, and the SPA.
•
CSCsz36987
Symptom: Logged messages are sent not only to the IOS system log in memory on the Cisco
MC5X20 line cards, but to the console serial port. This I/O activity uses CPU resources
unnecessarily especially at card bootup time. Console logging may be re-enabled by configuring the
logging console command.
Conditions: This issue is seen in all Cisco uBR10-MC5X20 line cards.
•
CSCsz37891
Symptoms: The Cisco uBR10012 router crashed because it ran out of unfragmented memory.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-82
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This is seen in Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsz42981
Symptoms: Multicast session is in I-state on the active PRE.
Workaround: There is no workaround.
•
CSCsz43764
Symptoms: In Cisco IOS Release 2.2(33)SCB3, executing the show controller modular-cable
x/y/z command with a copper SFP, SFP-GE-T, causes the wideband SIP to crash.
Conditions: The issue will occur if we have Copper SFP in a Wideband SPA gigabit ethernet port.
Workaround: Use a fiber SFP and a fiber link instead of a copper link.
•
CSCsz49382
Symptoms: Cable modems do not respond to layer 3 pings.
Conditions: This issue is only on the Cisco uBR10-MC5X20S and Cisco uBR10-MC5X20U cards
and when PRE-EQ (equalization-coefficient) is configured.
Workaround: Restart the cable line card.
•
CSCsz50204
Symptoms: A multicast QoS session is not automatically created when changing group
configuration or GQC.
Conditions: This issue is seen when a multicast QoS group is configured on a bundle interface and
a matching static-group is defined. However, any change in the group configuration after it is applied
to the bundle interface is not taken into effect, and the original multicast QoS session is removed.
Workaround: Remove the multicast QoS session from the bundle interface and re-apply it to the
bundle.
•
CSCsz55288
Symptoms: Alignment traceback messages are found when the show memory leak res user and
show buffer usage commands are executed.
Workaround: There is no workaround.
•
CSCsz56522
Symptoms: Potential wideband SPA Index leak is found during the line card switchover.
Conditions: This issue is found when the modem is deleted before the IPC is returned from the
guardian.
Workaround: There is no workaround.
•
CSCsz56613
Symptoms: The docsIfUpChannelTxBackoffStart/end value is inconsistent with the output from the
command value.
Workaround: There is no workaround.
•
CSCsz62620
Symptoms: During the VDOC video channel changes, it is possible that the multicast QoS service
flow cannot be created because a stale multicast QoS service flow exists for 140 seconds after the
last IGMP member. This prevents a new multicast QoS service flow from being created.
Conditions: This is seen in multicast QoS service flows.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-83
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsz67716
Symptoms: The “Gate Report State” counter in the output of the show packetcable cms verbose
command does not increment for PacketCable Multimedia (PCMM) policy servers.
Conditions: This issue is seen for PCMM policy servers.
Workaround: There is no workaround.
•
CSCsz69357
Symptoms: Memory leak is observed due to SID management task.
Conditions: This issue is observed when the packetcable calls are present.
Workaround: There is no workaround.
•
CSCsz69359
Symptoms: Memory leak is observed on the line card due to MAC parser with overnight PC calls.
Workaround: There is no workaround.
•
CSCsz70427
Symptoms: HQF logging does not work on Cisco PRE4.
Workaround: There is no workaround.
•
CSCsz73611
Symptom: CMTS will accept inconsistent “per-SF L2VPN TLV” in the cable modem configuration
file.
Conditions: This is seen in the following conditions:
– Upstream service flow (US-SF) or Downstream Confirmation-to-Receive (DS-CFR) Vendor
Specific TLV is specified.
– L2VPN vpnid is specified in the Vendor Specific TLV.
– The Vpnid does not match any of the top-level L2VPN TLV vpnid.
Workaround: There is no workaround.
•
CSCsz75180
Symptoms: CMTS may crash when an MPLS sub interface is deleted.
Workaround: Do not delete the sub interface.
•
CSCsz77977
Symptoms: OIR of a PCMCIA flash disk can cause a watchdog reset of the PRE.
Conditions: This issue is observed during OIR of the PCMCIA flash disk that is being actively
accessed.
Workaround: Restrict the removal of PCMCIA flash disks.
•
CSCsz85345
Symptoms: CM uptime mismatch is reported between the CMTS and few CMs.
Workaround: There is no workaround.
•
CSCsz88543
Symptoms: CPU increases to 100% on the Cisco MC5x20U and MC5x20S line cards after
upgrading to the Cisco IOS Release 12.2.(33)SCB2.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-84
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Downgrade the image version to Cisco IOS Release 12.3(23)BC7 or use MC5x20H
cards.
•
CSCsz92211
Symptoms: Legitimate CM which was online and BPI enabled will get disconnected along with the
following error messages printed with "CLONED_CM_DETECTED" corresponding to legitimate
modem’s MAC address.
Workaround: Once the legitimate CM goes offline and comes back again online with BPI enabled,
the next cloned CM attempt will fail.
•
CSCsz92784
Symptoms: In a SAMIS operation, counters are stuck in the downstream direction for cable
modems.
Workaround: Reset the cable modems.
•
CSCta00731
Symptoms: Traceback is seen at cable_hwidb2macdomain.
Workaround: Do not pre-configure the card command with ubr10k-clc-5x20h option. The card
command to use for the Cisco UBR-MC520H cards is card x/x 5cable-mc520h-d.
•
CSCta05673
Symptoms: Tracebacks are seen on the Cisco uBR10012 router after two multicast clients initiate
multiple joins and leaves.
Workaround: There is no workaround.
•
CSCta05835
Symptoms: Entries in docsBpi2CmtsMulticastObjects duplicate after the line card revertback.
Workaround: There is no workaround.
•
CSCta18008
Symptoms: The modems on a specific line card cannot come online after upgrading to Cisco IOS
Release 12.3(23)BC4.
Conditions: The following message is seen in the logs report the message:
%PXF_DMA-3-IRONBUS_NOTRUNNING: Data path to slot 5/0 failed to synchronize.
Workaround: There is no workaround.
•
CSCta18179
Symptoms: Spurious memory access occurs or CMTS crashes.
Conditions: This issue is observed when DSG configuration is removed and protect line card is
active.
Workaround: Do not update configuration when protect line card is active.
•
CSCta19673
Symptoms: Multicast functionality stops when the modems are reset on a different interface.
Workaround: Change to different multicast stream and then change back to original stream to restore
the stream.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-85
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCta25300
Symptoms: Wrong DS frequencies are offered to wideband CMs.
Workaround: There is no workaround.
•
CSCta27366
Symptoms: CPU utilization shoots to 100% for multiple times during FPGA upgrade.
Workaround: There is no workaround.
•
CSCta32429
Symptoms: Non-bonding capable modems are wrongly registered in bonded channels.
Workaround: There is no workaround.
•
CSCta32865
Symptoms: Improper SPA temperature minor warning reminder message is observed.
Conditions: This issue is observed when the WBCMTS SPA temperature crosses over minor
warning threshold 58C, and remains in the range of 58C ~ 68C for more than 10 minutes.
Workaround: There is no workaround.
•
CSCta35682
Symptoms: CIR queue or service flow is not created for the multicast session.
Workaround: Run the shut/no shut interface command and the session will be recreated.
•
CSCta37907
Symptoms: During the IPDR process, it is unable to delete config for cable metering.
Workaround: There is no workaround.
•
CSCta38030
Symptoms: CMTS may crash due to stack corruption.
Workaround: There is no workaround.
•
CSCta38214
Symptoms: CMTS may crash after a key-string is entered.
Workaround: There is no workaround.
•
CSCta38298
Symptoms: Active PRE fails over to the secondary reporting:
ACTIVE RP WATCHDOG TIMEOUT TRIGGERED
Conditions: This issue is observed on Cisco IOS Release 12.3(23)BC7.
Workaround: There is no workaround.
•
CSCta39239
Symptoms: When setting cable upstream docsis mode by SNMP, the standby PRE does not
synchronize this configuration.
Workaround: Set cable upstream docsis mode by CLI instead of SNMP.
•
CSCta39886
Symptoms: The arp entries are lost after a redundancy switchover or a crash
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-86
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCta42296
Symptoms: The Cisco SIP-600 crashed after executing the hw-module bay 1/0 shutdown and the
hw-module bay 1/1 shutdown commands at the same time.
Workaround: There is no workaround.
•
CSCta42483
Symptoms: Tracebacks appears while unconfiguring cable service attribute non-ds-bonded
downstream-type bonding-disabled and cable fiber node.
Workaround: There is no workaround.
•
CSCta45075
Symptoms: The show interface multicast-session command may show wrong multicast session
instances.
Workaround: There is no workaround.
•
CSCta49190
Symptoms: CMTS does not add IP address to the relayed DHCP packets.
Workaround: There is no workaround.
•
CSCta50171
Symptoms: The following CPUHOG message is seen when CPE is rapidly performing hundreds of
multicast joins and leaves and a hw-module reset is done on the line card.
005812: Jul 2 11:53:06.925: %SYS-3-CPUHOG: Task is running for (2000)msecs, more than
(2000)msecs (66/36),process = Net Background.
-Traceback= 4188E9F8 4187AFAC 4187E2C0 4187EB70 4187F5CC 4187F860 418848D4 41884988
41884A3C 402ACBC8 40264654 40264ABC 403E87FC 403E8AF0 403E8B44 402654D8
Workaround: There is no workaround.
•
CSCta52564
Symptoms: After sending multicast traffic and then a PRE switchover, the following unexpected
messages are displayed on the Standby PRE console.
Sid : 22, Interface: Cable6/1/0
000715: Jul 2 22:56:44.605: CMInstp is NULL![cmts_mcast_add_session_interface]
Sid : 93, Interface: Cable5/0/0
000716: Jul 2 22:56:44.609: CMInstp is NULL![cmts_mcast_add_session_interface]
Workaround: There is no workaround.
•
CSCta58106
Symptoms: Non default service flows and DSID entries were created when default multicast service
flow failed.
Conditions: This happens only when MQoS enabled scenario where admission control failed to
create multicast default SF.
Workaround: Make valid admission control parameters for the default service class template.
•
CSCta60559
Symptoms: A cable modem is wrongly assigned with a DS-SG-ID which does not exist on RP after
the line card switchover.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-87
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCta79555
Symptoms: The PRE crashes when an Etherchannel subinterface with dot1q encapsultation is
deleted.
Workaround: There is no workaround.
•
CSCta84647
Symptoms: DSG traffic is no longer forwarded to modular interface after changing bundle.
Workaround: Remove and add the bundle again
•
CSCta87172
Symptoms: Intermittent traceback message at OIR of PRE-4 flash disk.
Workaround: There is no workaround.
•
CSCta88850
Symptoms: When changing the service class on the fly for DSG tunnel, CMTS removes the old
service flow but fails to repopulate new service flows.
Workaround: Remove the DSG tunnel from the interface and re-config it.
•
CSCta89728
Symptoms: On a uBR10012 router with Cisco SIP-600 and wideband SPA, SIP-600 went down and
came back up due to the Software Watchdog Reset.
Workaround: There is no workaround.
•
CSCta93048
Symptoms: After a crash or a OIR of a cable line card, the RCC template is not applied to cable
interface.
Conditions: LCHA must be enabled. The initially active card crashes and comes up and becomes
active.
Workaround: When in this state unconfigure and re-configure the associated fiber-node.
•
CSCta98864
Symptoms: Active PRE4 reloaded after the hw-module bay 1/1/0 reload command was run.
Workaround: There is no workaround.
•
CSCtb04000
Symptoms: Traceback messages have been observed while executing the show interface command.
Workaround: There is no workaround.
•
CSCtb04025
Symptoms: Traceback messages have been observed after pulling the active PRE-B (PRE4) while it
was active.
Workaround: There is no workaround.
•
CSCtb04050
Symptoms: The MC5x1GE WAN SPA crashed after OIR.
Workaround: There is no workaround.
•
CSCtb05948
Symptoms: CMTS watchdog timeout crash is observed at cmts_address_filter or cmts_cm_lookup.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-88
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Downgrade the image version to Cisco IOS Release 12.2(33)SCB2.
•
CSCtb09245
Symptoms: Memory fragmentation might occur with memory allocation of 65535 bundle MAC
entry elements.
Conditions: This issue is likely to occur with multicast traffic.
Workaround: There is no workaround.
•
CSCtb33109
Symptoms: Some cable modems may go offline during a line card switchover process.
Conditions: This issue is observed when a Cisco MC5x20H line card that serves as a protect card
and Cisco MC5x20U line card is the working card, switches over from MC5x20H line card to
MC5x20U line card.
Workaround: Reduce the number of modems connected to the Cisco MC5x20U line card.
Resolved Caveats — Cisco IOS Release 12.2(33)SCB4
•
CSCsj45943
Symptoms: The no ip dhcp relay info policy removal pad config command has no effect.
Workaround:
•
1.
Copy the running config to the tftp or ftp server and edit it so that this config line is removed.
2.
Copy this edited configuration to nvram:startup-config.
3.
Reload the router.
CSCsw25895
Symptoms: Memory leak at CMTS_HCCP_GET_TLV_PARSE_TLV has been observed at the RP.
Workaround: There is no workaround.
•
CSCsw46068
Symptoms: It was not possible to ping the wideband cable modem after the test cable dcc tech 1
command is executed.
Conditions: This issue is observed when the cable modem is in the w-online MAC state.
Workaround: Use tech 0 for DCC operation for wideband cable modems.
•
CSCsw49606
Symptoms: A cable line card crash may occur if a test cable dcc command is executed on a 2.0
modem, move it from an ATDMA upstream to a TDMA upstream (with fragmentation disabled).
Conditions: The issue is seen in routers running Cisco IOS Release 12.3(23)BC4.
Workaround: There is no workaround.
•
CSCsw51992
Symptom: Invalid/ corrupt values seen for OctetsPassed and PacketsPassed fields in SAMIS records.
Conditions: CMTS with wideband SPA configured, query the service flow counters using SAMIS,
snmp or show CLI, sometimes it will show wrong value for the octets or/and packets for the
wideband modems or narrowband modems but using the remote SPA channel as primary
downstream.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-89
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsx20927
Symptoms: The startup configuration information for a standby PRE is not displayed.
Workaround: There is no workaround.
•
CSCsx31715
Symptoms: CMTS crashes after performing multiple IGMP join and leave messages.
Conditions: This issue is observed when multiple IGMP join and leave messages are transmitted and
with a standby PRE available.
Workaround: There is no workaround.
•
CSCsx33054
Symptoms: After a PRE processor module switchover, the following message is displayed:
"*Jan 29 10:22:33.187: %IPC-5-INVALID: Message Port index Dest Port 0x1001C Session
0x1 Source 0x60000"
Conditions: This issue has been observed on In Service Software Upgrade (ISSU) while upgrading
PRE A slot to PRE B slot processor modules.
Workaround: There is no workaround.
•
CSCsx48561
Symptoms: The Cisco Broadband Troubleshooter trace window appears to show incorrect data when
triggering an upstream by CM MAC address. The MIB object “server% getmany -v2c
ccsSpectrumDataPower” returns values that when graphed do not show the expected QAM
haystack. This MIB does not provide data until the CMTS is first configured appropriately via
SNMP sets.
Conditions: This issue occurs in upstream frequency stacking and configured MAC domains.
Workaround: Remove the frequency stacking and configured MAC domains.
•
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-20090923-tunnels.
•
CSCsx71837
Symptom: The title field “Name” in the show cable admission-control interface is missing.
Conditions: This is seen in the output of the show cable admission-control interface command.
Workaround: There is no workaround.
•
CSCsx94352
Symptoms: The wideband cable interface is not able to pass traffic.
Conditions: The issue occurs because the bonded channel-to-RF channel mapping configuration is
missing from the SPA.
Workaround: There is no known workaround.
•
CSCsy07555
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-90
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Cisco IOS devices that are configured for Internet Key Exchange (IKE) protocol and certificate
based authentication are vulnerable to a resource exhaustion attack. Successful exploitation of this
vulnerability may result in the allocation of all available Phase 1 security associations (SA) and
prevent the establishment of new IPsec sessions.
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-ipsec
•
CSCsy09861
Symptoms: Upstream-and-downstream-related tables are not retrieved while querying via SNMP.
Conditions: This issue is seen while querying via SNMP.
Workaround: There is no workaround.
•
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090923-auth-pro
xy
•
CSCsy23311
Symptom: The Cisco uBR10012 router experienced several crashes when upgrading from Cisco IOS
Release12.3(21a)BC6 to Cisco IOS Release 12.3(23)BC6.
Conditions: These crashes have been found when upgrading from Cisco IOS Release 12.3(21a)BC6
to Cisco IOS Release 12.3(23)BC6.
Workaround: There is no workaround.
•
CSCsy33777
Symptoms: The PRE crashes when the no cable modem remote-query command is run.
Conditions: This issue may occur only when the minimum polling interval is “cable modem
remote-query 1 public”.
Workaround: The polling interval should not be a minimum value.
•
CSCsy47122
Symptoms: Different values for the MAC Domain Downstream Service Group (MD-DS-SG) are
seen after an RPR switchover, using the show cable modem wideband and show cable
mac-domain downstream-service-group commands.
Conditions: This issue occurs while changing the MD-DS-SG by changing the fiber node when
CMTS is up and after a RPR switchover.
Workaround: There is no workaround. This symptom is not critical. It does not affect normal use of
relative features.
•
CSCsy55849
Symptoms: The show controller modular-cable command output displays invalid voltage
measurement readings for the 24 rf-channel SPA.
Conditions: This is seen on the 24 rf-channel SPA.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-91
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Re-execute the show controller modular-cable command.
•
CSCsy72055
Symptoms: When attempting to upgrade a Cisco uBR10012 router from Cisco IOS Release
12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the secondary PRE processor module may crash
directly after the primary PRE processor module crashes.
Conditions: This issue occurs in routers running Cisco IOS Release 12.3(21)BC.
•
CSCsy72398
Symptoms: Due to the way the CMTS US scheduler is designed, the VoIP traffic from a single
CMTS shows the tendency to get synchronized in time.
Conditions: This issue is seen when multiple CMTSs are connected to the same DTI server, and the
egress VoIP traffic from these CMTSs to get synchronized. This multi-CMTS VOIP synchronization
causes the peak VoIP rate on the aggregation routers to the levels which default buffers cannot be
handled.
Workaround: If the UGS scheduling across US channels is randomized on a single CMTS, it may to
resolve the issue.
•
CSCsy93201
Symptoms: Facility alarms are incorrectly generated for cable line card interfaces.
Conditions: This issue occurs when line card redundancy is configured or upstream frequency
stacking is configured.
Workaround: There is no workaround.
•
CSCsz21551
Symptoms: Cable modems report non-primary DS channel impairments during registration time via
the partial-service in the REG-ACK message.
Workaround: There is no workaround.
•
CSCsz23805
Symptoms: If a modular-cable channel with online modems is removed from its host and
reconfigured to another host, the flows counter are incorrectly displayed.
Conditions: This is seen when a modular-cable channel is removed from its host and reconfigured
to another host.
Workaround: There is no workaround.
•
CSCsz27688
Symptoms: During the PRE switchover, Subscriber Account Management Interface Specification
(SAMIS) feature may not successfully export data.
Workaround: There is no workaround.
•
CSCsz27774
Symptoms: The fiber node accepts non-existent upstream connectors, which may confuse the user
on physical and logical topology.
Conditions: This issue occurs when configuring non-existent upstream connectors on the fiber node.
Workaround: Do not configure non-existent upstream connectors for the fiber node.
•
CSCsz33371
Symptoms: A cable modem with multiple service flows failed to respond to pings from the RP after
the line card switchover.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-92
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsz38521
Symptom: The DOCSIS Timing, Communication and Control (DTCC) card information is
displayed in the output of the show diagnostic command when the card is not present.
Conditions: This issue is seen when both SPA cards are present in the slot/subslot and utility cards
are present in slot/subslot. For example, a SPA is present in 1/1 and a DTCC card is present in 1/1.
Workaround: There is no workaround.
•
CSCsz47949
Symptom: The number of wideband modems collected via snmp walk and show cable modem
wideband command does not match.
Conditions: This is an intermittent problem and is not seen on all routers.
Workaround: Run the show cable modem wideband command to know the exact number of
wideband modems.
•
CSCsz49641
Symptom: The running configuration shows “-2147483” for ip rsvp dsbm non-resv-send-limit
[burst | peak | rate] 2147483 command, which may indicate that the CMs are not working properly.
Conditions: This issue is seen while configuring the upper limit value for ip rsvp dsbm
non-resv-send-limit command.
Workaround: Do not configure the upper limit value for ip rsvp dsbm non-resv-send-limit
command.
•
CSCsz51198
Symptoms: The guardian line card does not synchronize with the new key to the standby line card,
when a key is renewed for a wideband multicast sid,. This causes the wrong key to be sent to a
wideband CM for that multicast sid after the guardian lie card switches over.
The information is not synchronized to the standby line card when the guardian line card assigns an
index to a modular-cable multicast sid and key. It may reassign, the same key after a switchover.
If the index of a remote guardian line card is not rightly made free for a modular-cable multicast sid
and key, This could cause an index leak for the remote guardian line card and the information is not
synced to the standby for both local and remote line cards.An index leak may happen if the guardian
line card switches over.
When an modular-cable interface is shut or removed from a Channel Grouping Domain (CGD),
indexes are not cleaned up on standby guardian line card causing an index leak if the guardian
switches over.
Condition: This is seen after a guardian line card switchover.
Workaround: There is no workaround.
•
CSCsz52508
Symptom: The test cable dcc frequency command moves 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 only affect test cable dcc frequency command.
Workaround: Use test cable dcc frequency command to move the modem where the upstream
channel ID belongs to the target downstream channel.
•
CSCsz52617
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-93
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
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
•
CSCsz53710
Symptom: The Multimedia Terminal Adapter (MTA) lacks IP connectivity and cannot be reached.
Conditions: This is seen when upgrading to Cisco IOS Release 12.2(33)SCB2.
Workaround: Reset the MTA.
•
CSCsz55064
Symptoms: The Cisco CMTS cable line card crashes under some rare conditions when a cable
modem is doing initial ranging.
Conditions: This issue may occur when an online modem goes offline and does an initial ranging
before the CMTS can detect that the modem has gone offline.
Workaround: There is no workaround.
•
CSCsz56059
Symptoms: The cable dynamic-secret lock command does not lock the rogue modem to 10kbps
upstream or 10kbps upstream /downstream profile. The show cable modem <mac of rogue
modem> qos command reports 0/0 kbps upstream/ downstream rates for the same modem after the
same modem reboots or resets.
Conditions: The issue has been observed on Cisco uBR10012 router with PRE2 processor module
running Cisco 12.3(23)BC4 with cable dynamic-secret lock command configured under the cable
interface.
Workaround: There is no workaround.
•
CSCsz56707
Symptom: The “PXF DMA Cumulative Ironbus Error Statistics” values are incriminated when
executing the show pxf dma counters | include Ironbus command. For example, the error statistics
displayed are:
PXF DMA Cumulative Ironbus
Ironbus Event 1/0:
Ironbus Event 1/1:
Ironbus Event 2/0:
Ironbus Event 2/1:
Ironbus Event 3/0:
Ironbus Event 3/1:
Ironbus Event 4/0:
Ironbus Event 4/1:
Ironbus Event 5/0:
Ironbus Event 5/1:
Ironbus Event 6/0:
Ironbus Event 6/1:
Ironbus Event 7/0:
Ironbus Event 7/1:
Ironbus Event 8/0:
Ironbus Event 8/1:
Error Statistics:
0
166
2843674
2843674
70
67
63
64
241
2843674
278
268
250
269
2843674
1580072
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-94
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: The above errors are observed on a Cisco uBR10012 router with a PRE2 processor
module running Cisco IOS Release 12.2(33)SCB1 and Cisco IOS Release 12.2(33)SCB2.
Workaround: There is no workaround.
•
CSCsz57079
Symptoms: The Arris Embedded Multimedia Terminal Adapter (EMTA) modems do not get a dial
tone after a PXF crash.
Conditions: This issue is seen on a Cisco uBR10012 router running Cisco IOS Release
12.2(33)SCB2. This is seen after a PXF crash and when the Arris modems are in the “In Progress
Telephony-DHCP” state.
Workaround: Switch over to the standby PRE module and execute the clear cable modem
command.
•
CSCsz60401
Symptoms: The following SPA bus error and Jacket watchdog reset is displayed on a Cisco
Wideband SIP crashinfo:
SPI FPGA: TIB SPA1 Bus Error [1/16]
Machine Check Error, can be ECC or Watchdog..
ECC 1 bit errors since last time we cleared = 0
ECC 1 bit errors while up (total) = 0
Conditions: This issue is seen when Cisco Wideband SPA power is shutdown and if power supply
violation is watched by power management hardware to protect components on SPA.
Workaround: There is no workaround.
•
CSCsz67488
Symptom: The active time is inaccurate both downstream and upstream service flows with Cisco
uBR10012 router The show interface cable x/y/c sid command indicates a correct age value.
Conditions: This issue was observed on Cisco uBR10012 routers running Cisco IOS Release
12.3(23)BC7 when DOCSIS QoS calls were created on a non DOCSIS QoS packetCable
environment.
Workaround: Use the show interfaces cable x/yz sid command to see the correct value.
•
CSCsz67961
Symptoms: The PacketCable Multimedia (PCMM) calls fail as the Gate Set Ack/Err is not received.
Conditions: This issue is seen in PCMM calls with a small value used for timer T1 (such as 1
second).
Workaround: Use larger values for the PCMM timer T1 (at least 5 seconds).
•
CSCsz70939
Symptoms: A a long latency for VDOC video channel change is seen as the Dynamic Bonding
Change (DBC) timer restricts the CMTS to have another transaction on the same CM.
Conditions: This is seen due to the DBC timer value.
Workaround: Lower the T10 timer to 10 ms.
•
CSCsz74407
Symptom: The Policy Based Routing (PBR) functionality (set ip next-hop and set ip default
next-hop) does not work with the PRE4 processor module.
Conditions: This is seen in the PRE4 processor module.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-95
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsz80114
Symptoms: When one Cisco SIP-600 card is removed, the downstream data on the second SIP-600
card may be permanently disrupted on some service flows.
Workaround: Choose one of the following options as a workaround to this issue.
– To restore downstream traffic, shut down the associated wideband or narrowband interface and
then bring it back up.
– Reset the SPA.
•
CSCsz82994
Symptoms: When downstream load balancing (modem count method) is configured on a MAC
Domain, where DOCSIS 3.0 and DOCSIS 2.0 are mixed, the total number of CMs to be
load-balanced across the downstream interfaces are incorrect.
Conditions: The wideband modem may be corrupted. The downstream interface may go into the
initial state with active CMs.
Workaround: Reload the CMTS.
•
CSCsz83196
Symptoms: The “No map buffer” error is seen during a PXF crash and modem drop offline.
Workaround: There is no workaround.
•
CSCsz83932
Symptoms: The wideband cable modem goes offline after the working line card is changed during
the line card switchover.
Workaround: Do not change the working line card configuration after restarting the modem.
•
CSCsz85840
Symptoms: The show inventory command output does not display the SPA’s correct serial number
after swapping any two SPAs.
Workaround: There is no workaround.
•
CSCsz91408
Symptoms: Admission control checking in the dynamic load balancing state may not work in some
circumstances.
Workaround: There is no workaround.
•
CSCsz91982
Symptoms: Traceback is observed after running the show diag command.
Conditions: This issue was observed on the Cisco uBR10012 routers running Cisco IOS Release
12.2(33)SCB3 with WBCMTS SPA.
Workaround: There is no workaround.
•
CSCsz93043
Symptoms: After squeezing (removing the deleted files from the bootflash) the bootflash on a cable
line card, the following system log is generated that may encourage reformatting of line card
bootflash.
cisco#squeeze clc5_0-bootflash:
All deleted files will be removed. Continue? [confirm]
Squeeze operation may take a while. Continue? [confirm]
Squeeze of clc5_0-bootflash complete
cisco#
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-96
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
SLOT 5/0: Jun 1 14:05:24.541 CDT: %FILESYS-5-MISMATCH: bootflash device programming
algorithm mismatch detected, reformat is recommended
Conditions: This issue is observed on the Cisco uBR10-MC5X20S, Cisco uBR10-MC5X20H, and
Cisco uBR10-MC5X20U cards running Cisco IOS Release 12.2(33)SCB2.
Workaround: Format the bootflash as recommended.
•
CSCsz97763
Symptoms: A PRE with a faulty ethernet controller for the IPC data path may indirectly cause cable
line cards to crash.
Conditions: The router must be configured to use remote SPA channels using the downstream
Modular-Cable command.
Workaround: There is no workaround.
•
CSCta01321
Symptoms: More than one classifier cannot be added to the DOCSIS Set-Top Gateway (DSG) tunnel
and it remains in disabled state.
Conditions: The router had the DSG source specific tunnel-group configuration.
Workaround: There is no workaround.
•
CSCta03544
Symptoms: The interfaces using frequency stacking may get dropped up to 10 dB in the average
MER readings of show controllers cable command.
Conditions: This is seen in routers running Cisco IOS Release 12.3(23)BC7.
Workaround: Remove the frequency stacking or remove the frequency on the unused upstream.
•
CSCta03620
Symptoms: PXF crashes with the following error message in the PXF Crashinfo report.
PXF DMA Error - Invalid Source Descriptor Based on Command
Conditions: This is seen in routers running Cisco IOS Release 12.2(33)SCB2.
Workaround: There is no workaround.
•
CSCta03695
Symptoms: Packetcable gates are stuck in the ALLOC state after HW-Module reset.
Workaround: There is no workaround.
•
CSCta03992
Symptoms: DOCSIS Set-Top Gateway (DSG) statistics does not show the modular cable interfaces
Downstream Channel Descriptor (DCD) counters.
Conditions: This occurs in normal conditions.
Workaround: There is no workaround.
•
CSCta06866
Symptom: When a modem is load balanced with Dynamic Channel Change (DCC), receives a
“cdxCmtsCmOnOffNotification” OFF trap from the cmts, but no corresponding ON trap.
Conditions: This is seen on a Cisco uBR10012 router running Cisco IOS Release12.3(23)BC2 with
snmp-server traps enable cable cm-onoff command configured in the global configuration and
cable enable-trap [cm onoff-notification] command on each interface along with load balancing
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-97
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCta07287
Symptoms: FPGA upgrade may fail and corrupt the SPAs that are plugged into the Cisco SIP-600.
Conditions: This issue is observed during OIR of one SPA while the FPGA of another SPA is being
upgraded or hardware/ low-level software failures on the jacket card.
Workaround: Perform the following tasks.
•
1.
Upgrade the wideband SPA firmware by loading the latest Cisco IOS Release 12.3(33)SCB
image on the CMTS.
2.
Move the SPA from the SPA-24XDS-SFP to the Cisco SIP-600.
CSCta08871
Symptoms: A Cisco uBR10012 router running Cisco IOS Release 12.2(33)SCB2 may have a
counter issue as observed with show interface command.
Workaround: There is no workaround.
•
CSCta10496
Symptoms: CMTS may crash when the IPDR Exporter/Collector session restarts too fast.
Conditions: This issue is observed when the IPDR session is configured and the IPDR exporter is
running.
Workaround: The collector does not restart the session at a faster rate, so delay the time interval to
connect of 1 minute before restart.
•
CSCta11130
Symptoms: The default facility-alarm command does not set the facility alarm values to the default
values but wrongly executes the no facility-alarm command.
Workaround: There is no workaround.
•
CSCta17843
Symptoms: Modems do not go online during CM steering even if load balancing is configured on
them.
Workaround: There is no workaround.
•
CSCta25139
Symptoms: Some signal-to-noise ratio (SNR) difference is observed when frequency stacking is
configured.
Conditions: This issue is only on the Cisco uBR10-MC5X20S and Cisco uBR10-MC5X20U cards
and when PRE-EQ (equalization-coefficient) is configured.
Workaround: Run the no-shut the first upstream command.
•
CSCta25861
Symptoms: After a PRE switchover, local CMTSs can ping the affected modems but the remote
hosts cannot ping modems.
Workaround: Reset the modems.
•
CSCta26785
Symptoms: PRE and line cards crash while accessing invalid memory area.
Conditions: This issue is observed when default multicast service flow is being deleted.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-98
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCta31219
Symptoms: Dropped or delayed DOCSIS MAC management packets resulted in problems such as
call failures.
Conditions: Combination of Multicast QoS configuration with BPI+ encryption coupled with the
blocking of IGMP for those same multicast groups.
Workaround: Do not configure multicast QoS with BPI+ for groups where IGMP is blocked.
•
CSCta31495
Symptoms: Multicast QoS service flow is not created for the DSG tunnel, after the CMTS reloads
with the service class and DSG configuration.
Workaround: There is no workaround.
•
CSCta31825
Symptoms: CPUHOG error messages appear when many multicast QOS sessions get deleted after
IGMP leave within a short time.
Workaround: There is no workaround.
•
CSCta33463
Symptoms: Cable line card crashes during CM registration in Remote Copy Protocol (RCP) verbose
reporting mode.
Conditions: This issue is observed when the cable rcp-control verbose command is enabled and if
the CM is sending the CLABS defined RCP 00 10 00 00 05 in the verbose format.
Workaround: Do not enable the cable rcp-control verbose command under the cable interface.
•
CSCta33705
Symptoms: The show controller cable upstream command output for the MAC Parser queue
information shows the same numerical value for the queue depth and wait time. The wait time is not
shown correctly, the wait time is shown as a duplicate of the queue depth.
Workaround: There is no workaround.
•
CSCta33898
Symptoms: The wideband SPA cannot upgrade firmware for a corrupted field-programmable gate
array (FPGA) with field-programmable devices (FPD).
Workaround: If the SPA with the corrupt FPGA is plugged into the UBR10-2XDS-SIP, then the
FPGA gets upgraded properly.
•
CSCta35663
Symptoms: Narrowband cable modems cannot get online on remote downstreams after both the
Protect and the Working line cards are reset in a CMTS with more than 2 SPAs in the system.
Workaround: Revert to the previous configuration or reload the CMTS.
•
CSCta42189
Symptoms: The wideband SPA in Cisco SIP-600 is stuck after executing the hw-module bay x/y
shutdown and no shutdown command.
Workaround: Reload the wideband SPA.
•
CSCta43825
Symptoms: Executing the cmts walk command on ARP table causes high CPU utilization. This is
also seen while using the snmp walk command on the ARP table.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-99
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue occurs while using the cmts walk and snmp walk commands.
Workaround: To prevent high CPU utilization when using the snmp walk command, use snmp view
commands:
– snmp-server view cutdown iso included
– snmp-server view cutdown at excluded
– snmp-server community public view cutdown ro
– snmp-server community private view cutdown rw
•
CSCta47029
Symptoms: Router is experiencing spurious memory access during the ipv6_spd_pak_classify.
Conditions: This issue is observed after configuring IPv6 on the Fast Ethernet interface.
Workaround: There is no workaround.
•
CSCta48808
Symptoms: DSG:Downstream Channel Descriptor (DCD) counters increment even while modular
interfaces are down.
Workaround: There is no workaround.
•
CSCta48860
Symptoms: Memory leak is observed in cmts_fill_peak_offpeak_parameters.
Conditions: This issue is observed when the peak-offpeak enforce rule is changed to legacy settings
and the rule is enabled.
Workaround: Do not change peak-offpeak rule to legacy and define a new enforce rule.
•
CSCta60033
Symptoms: Traceback and spurious memory access is observed due to failover of either PREs.
Workaround: There is no workaround.
•
CSCta60671
Symptoms: The SPA flaps after reloading the CMTS.
Conditions: This issue is observed on the Cisco router running Cisco IOS Release 12.2(33)SCB3
with 5 SFPs in slots 1 and 3 after reloading the CMTS.
Workaround: There is no workaround.
•
CSCta62911
Symptoms: The ip dhcp relay info policy removal pad command is not ISSU compliant.
Workaround: ISSU cannot be conducted and the CMTS must be reloaded.
•
CSCta66514
Symptoms: Though cable modems are online, the CMTS is not able to ping them after unrelated
wideband or modular cable interface is shut down.
Workaround: Shut down the affected interface and then re-enable that interface.
•
CSCta67001
Symptoms: CMTS crashes when removing the flash card.
Workaround: There is no workaround.
•
CSCta69454
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-100
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Traceback is observed after the Multicast client initiating igmp join with
group-encryption is enabled.
Workaround: There is no workaround.
•
CSCta70254
Symptoms: The interrupts are not disabled when a SPA is stopped.
Workaround: There is no workaround.
•
CSCta71632
Symptoms: Multicast traffic was not sent when a RF channel is added to the existing multicast
tunnel.
Workaround: Re-apply the DSG configuration or execute the shut and no shut command for the RF
channel.
•
CSCta71839
Symptoms: Ping failure observed after weekend traffic and the cable modem reset.
Workaround: There is no workaround.
•
CSCta76116
Symptoms: Wideband modems go offline after line card switchover was triggered by cable power
off.
Workaround: There is no workaround.
•
CSCta76835
Symptoms: The IGMP input process causes high CPU utilization on the PRE.
Conditions: This issue is observed during high rate of IGMP joins received and multiple cable
interfaces present on CMTS.
Workaround: Enable “multicast echo” on bundle interface.
•
CSCtb05213
Symptoms: After service flows are created for the multicast traffic, the show interface wideband
1/1/0:2 service-flow x counters command unexpectedly displays the service flow counters as zero.
Workaround: There is no workaround.
•
CSCtb13769
Symptoms: A few DSIDs are wrongly assigned to more than one wideband cable modem and ping
failure occurs to one of them.
Workaround: Execute clear cable modem reset command to issue a new DSID.
Open Caveats—Cisco IOS Release 12.2(33)SCB3
•
CSCek30621
Symptoms: Wideband modem downstream throughput rate is not yet supported.
Conditions: The packet per second and bits per second throughput rate for each wideband CM
downstream service flow is not available. This affects both the show cable modem Cx/y/z
service-flow [counters | verbose] and show cable modem a.b.c.d qos commands.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-101
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCso71883
Symptoms: String commands fail to run in the Cisco IOS Tcl shell.
Conditions: This issue occurs while running string commands in Cisco IOS Tcl shell.
Workaround: There is no workaround.
•
CSCsq45997
Symptoms: The throughput rate shows (slightly) more than the expected range.
Conditions: This issue happens when the Dynamic Message Integrity Check (DMIC) feature is
enabled and the modem is marked with given maximum rate values. This can also happen when the
QoS profile has got lower maximum rates.
Workaround: There is no workaround.
•
CSCsq88s068
Symptom: The DOCSIS Set-Top Gateway (DSG) client does not work on the modular cable
interface.
Conditions: This issue occurs on a fully functional and configured MAC domain on the Cisco
uBR10-MC5X20 cable line card. When a modular cable SPA is inserted and configured, and the
modular-cable downstream is applied to the MAC domain on the Cisco uBR10-MC5X20 line card,
Downstream Channel Descriptor (DCD) messages are not sent.
Workaround: To enable the modular cable interface to function properly, it is necessary to execute
the shut and the no shut commands on the MAC domain of the Cisco uBR10-MC5X20 line card
that is associated with the modular cable interface.
•
CSCsu00342
Symptoms: Multicast stream drop, after changing the “ip igmp query-interval”. The following show
the output before and after the change:
Before the change:
Router# show ip mroute
<<..skipped..>>
(, ), 01:09:04/00:02:52, flags: sTI
Incoming interface: TenGigabitEthernet1/1, RPF nbr 10.x.x.x, RPF-MFD
Outgoing interface list:
Vlan50, Forward/Sparse, 00:48:45/00:02:52, H <<====
After the change:
Router# show ip mroute
<<..skipped..>>
(, ), 01:28:19/00:02:36, flags: sPT
Incoming interface: TenGigabitEthernet1/1, RPF nbr 10.x.x.x, RPF-MFD
Outgoing interface list: Null <<====
Conditions: The issue is was first seen in a Cisco 7600 chassis with a Supervisor 720 engine running
Cisco IOS Release 12.2(33)SRB.
Workaround: There is no workaround.
•
CSCsu22450
Symptoms: Inactive sessions are observed in the multicast explicit tracking database.
Conditions: This issue is seen when IGMP leave is received for a group followed by a CLC
switchover.
Workaround: There is no workaround.
•
CSCsu33316
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-102
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: The cable line card crashes after the execution of the clear arp and clear cable modem
delete commands.
Conditions: The condition is unknown.
Workaround: There is no workaround.
•
CSCsu45950
Symptoms: Certain PCMM calls using wideband CMs may have one way audio.
Conditions: This issue occurs when PCMM calls between w-online (pt) and online (pt) on wideband
CMs have one-way audio.
Workaround: There is no workaround.
•
CSCsu53695
Symptoms: When Multicast Virtual Private Network (MVPN) is configured on the CMTS, and a
CPE joins a multicast group that a source is already transmitting to, then the (S,G) entry is not
created in the MVRF table of the CMTS.
Conditions: This issue occurs when MVPN is configured on the CMTS.
Workaround: There is no workaround.
•
CSCsu77588
Symptoms: The online cable modems go offline with no alert or log message.
Conditions: This issue is only related to Cisco uBR10-MC5X20U cards on the Cisco uBR10012
platform. This issue is similarly seen in Cisco uBR10-MC5X20H cards.
Workaround: Executing the shut or the no-shut commands on the affected interfaces or
power-cycling the cable line card solves the problem.
•
CSCsv11435
Symptoms: When a modem comes up during off-peak time when it is not supposed to be monitored,
as per the enforce-rule configured, the SNMP is not synced to the standby line card.
Conditions: This issue is seen if a line card switchover is done during off-peak time. Even if the
modem enters the peak time, it is not monitored as per the enforced rule configured. The SNMP is
synced to the standby line card once the modem is monitored during the peak time.
•
CSCsv12582
Symptoms: The CPE device disappears from the cable host table and sometimes from the ARP table,
thus causing the CPE to lose IP connectivity. This shows up across different CM vendors, different
CLC types, different plants, and on different Cisco uBR10012 routers.
Conditions: The issue is seen in the following:
– The CPE loses connectivity.
– The CPE does not show up on the CMTS using any show commands such as show cable
modem.
– RP entry for the CPE is seen in the ARP table.
– The CPE keeps sending DHCPDISCOVER messages, even if the CNR responds with
DHCPOFFER.
Workaround: Execute clear cable host command for the CPE device until the device shows up on
the CPE table again.
•
CSCsv85159
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-103
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: The upstream ports configured as HCCP protect show the port link down when
executing the show facility-alarm status command.
Condition: This issue is seen when the cable line card is configured as HCCP protect, and the router
is running a later image version than Cisco IOS Release 12.3(23)BC2.
Workaround: There is no workaround.
•
CSCsw14622
Symptoms: For deleted service flows associated with PCMM calls, the last character in the Service
Class Name field is dropped in SAMIS records as well as in the SNMP MIB object
“docsQosServiceFlowLogServiceClassName”.
Conditions: This issue is seen when the dynamic service flows associated with PCMM calls are
deleted. The last character is missing from the service class name in the MIB object
“docsQosServiceFlowLogServiceClassName” and SAMIS records.
•
CSCsw24639
Symptoms: While executing the clear counter command, service flow statistics are not getting
cleared under the wideband interface.
Conditions: This issue is seen in cases of multicast and the forwarding is through the wideband
interface. Multicast service flows are created and the counters are maintained under the wideband
interfaces.
Workaround: There is no workaround.
•
CSCsw25895
Symptoms: Memory leak at CMTS_HCCP_GET_TLV_PARSE_TLV has been observed at the RP.
Workaround: There is no workaround.
•
CSCsw33866
Symptoms: Both the working card and protect card are active.
Conditions: This issue is seen when a line card switchover happens from 5/0 to 5/1. After
synchronization, shut down the 5/0/2 interface, and then revert from 5/1 to 5/0. If the 5/0/2 interface
is not shut down, and after the suspend timer interval expires, both 5/0 and 5/1 are active.
Workaround: Do not shut down an active protect interface. If both the cards (working and protect)
are active, reset the protect card.
•
CSCsw49188
Symptoms: Cable metering fails and enters a “hung” state.
Conditions: The issue happens when the “ip tcp timestamp” option is configured globally.
Workaround: Do not use the “ip tcp timestamp” option.
•
CSCsw68921
Symptoms: Traffic fluctuation only happens when the WB/MC topology and traffic rate are exactly
the same.
Conditions: This issue is seen in Cisco IOS release 12.2SC with HQF scheduler. When 46 percent
of bandwidth is allocated to Channel 0 for MC0 and 46 percent of the bandwidth is allocated to
Channel 1 for MC1,the rest of the bandwidth is allocated to WB0.
Thus, the traffic rate of WB is higher than the configured percentage. The traffic rate of MC0 is a
little lower than the configured percentage and the traffic rate of MC1 is a little higher than the
configured percentage.
Workaround: Do the following:
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-104
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
– Change the topology of MC/WB. Combine the two MCs into one.
– Change the percentage of MC/WB.
– Disable dynamic bandwidth sharing.
•
CSCsw76178
Symptoms: During line card high availability, the CM instance bpi_enable flag on the Route
Processor (RP) is not synced over correctly.
Conditions: This issue is seen while generating multicast stream to CMs, and if BPI CM is used
during a line card switchover.
Workaround: There is no workaround.
•
CSCsw78972
Symptoms: The MAC Domain Descriptor (MDD) change message is generated on all the RF
channels globally for any RF channel configured on the CMTS.
Conditions: This issue occurs when an MDD change is supposed to be generated for channels within
the MAC domain.
Workaround: There is no workaround.
•
CSCsw89385
Symptoms: When a Cisco uBR10012 router has a lot of CMs, the show cable modem docsis
version summary command total may not be able to display each column properly because there is
not enough space between columns.
Conditions: This issue is seen when there are a lot of cable modems. This issue is seen in Cisco IOS
Release 12.3(23)BC and Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsw91781
Symptoms: When the cable sync-interval command is configured, the cable interface needs to
execute a shut or no-shut command for the interval change to take effect.
Conditions: This issue occurs while configuring the cable sync-interval command.
Workaround: There is no workaround.
•
CSCsx16104
Symptoms: The downstream Committed Information Rate (CIR) reservation for wideband cable
modems works as expected, however they are displayed incorrectly under admission control
command.
Conditions: This issue is seen in any w-online state wideband cable modem with non-zero CIR
reservations. It displays the CIR reservation as 0 although the reservation admit or not admit works
properly. The show interface admission-control reservation downstream command displays the
0 CIR for the wideband CM.
Workaround: Use the show cable modem qos command to display the correct reservation.
•
CSCsx25792
Symptoms: When either Cisco uBR-MC5X20U/S/H card MAC domains have wideband
associations, a traceback may be observed along with a message similar to the following when NO
CARD x/x is used:
*Jan 25 05:41:57.235 PST: %SYS-3-BADLIST_DESTROY: Removed a non-empty list(2F3F7BF4,
name: (unknown)), having 36 elements -Process= "C10K Card Actions", ipl= 0, pid= 75
A small amount of memory leak may also happen. No other side effects are expected.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-105
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This traceback is seen only if the card had a NB-WB association previously, and was
powered down or removed.
Workaround: There are no workarounds.
•
CSCsx33054
Symptoms: After a PRE processor module switchover, the following message is displayed:
"*Jan 29 10:22:33.187: %IPC-5-INVALID: Message Port index Dest Port 0x1001C Session
0x1 Source 0x60000"
Conditions: This issue has been observed on In Service Software Upgrade (ISSU) while upgrading
PRE A slot to PRE B slot processor modules.
Workaround: There is no workaround.
•
CSCsx46105
Symptoms: Port-channel interfaces used in conjunction with 802.1q subinterfaces show a number
of problems on both the PRE4 and PRE2 processor modules. This was observed while testing the
Cisco SPA-5X1GE-V2 in Cisco IOS Release 12.2(33)SCB. The problem appears to be with the
4-jacket WAN interface, and not with the older half-height Gigabit Ethernet interfaces.
Conditions: This issue occurs in a PRE2 processor module under the following conditions:
– Any change to member links (adding or removing or executing the shut or no shut commands)
requiring that the port-channel subinterface be deleted and reconfigured.
– A reload of CMTS requiring that port-channel subinterface be deleted and reconfigured to
restore traffic.
This issue occurs in a PRE4 processor module under the following conditions:
– A reload of CMTS requiring a PXF microcode reload in order to restore traffic over
port-channel subinterface.
– The show pxf cpu statistics drop command shows “fib rpf” fails under the interface
port-channel interface.
Workarounds: To restore the traffic, do the following:
1.
Copy the configuration of the port-channel and the VLANS.
2.
Delete the port-channels.
3.
Edit the configuration to configure Gigabit Ethernet interfaces in a port-channel, before
configuring VLAN subinterfaces.
4.
Paste the edited configuration in the CMTS.
Theoretically, you can boot the CMTS with no Ethernet channel configured, and copy an edited
production configuration file to running-config after all the interfaces are up.
•
CSCsx48561
Symptoms: The Cisco Broadband Troubleshooter trace window appears to show incorrect data when
triggering an upstream by CM MAC address. The MIB object “server% getmany -v2c
ccsSpectrumDataPower” returns values that when graphed do not show the expected QAM
haystack. This MIB does not provide data until the CMTS is first configured appropriately via
SNMP sets.
Conditions: This issue occurs in upstream frequency stacking and configured MAC domains.
Workaround: Remove the frequency stacking and configured MAC domains.
•
CSCsx49779
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-106
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: The w-online state modem comes online after protect line cards are reset before a
resynchronization.The CMTS is configured with N+1 redundancy. If the working line card (7/0) is
reset, the modem switches to protect (5/0). If the protect (5/0) line card is reset before
resynchronization, the modem disappears, and comes in online instead of being in the w-online
state.The clear cable modem reset command does not work to bring the modem back to the
w-online state.
Conditions: This issue occurs while resetting an active line card during the standby line card bootup
period, but before the static synchronization of an active to standby line card finishes.
Workaround: Reload the line card or the CMTS.
•
CSCsx50104
Symptoms: An IRONBUS_FAULT is displayed while pulling out the Cisco SIP-600.
Conditions: This issue is seen in Cisco IOS Release 12.2(33)SCB image running on a Cisco
uBR10012 router.
Workaround: There is no workaround.
•
CSCsx50120
Symptoms: A Spurious Memory access was observed on a cable line card when Online Insertion and
Removal (OIR) of the Cisco SIP-600 was done on a PRE 4 processor module.
Conditions: This issue is observed on PRE 4 processor module with an active wideband SPA.
Workaround: There is no workaround.
•
CSCsx54139
Symptoms: The show cable bundle multicast command does not display the entire bundle in the
interface column.
Conditions: This issue is seen in the output of the show cable bundle multicast command.
•
CSCsx54955
Symptoms: Multimedia Terminal Adaptor (MTA) CMs are not accessible from the CMTS or
Internet because the ARP entry is replaced with an all-zero MAC address. Hence it is not accessible
when a crafted packet is sent.
Conditions: This issue occurs when a crafted packet is sent to the CMTS, causing the CMTS to use
the wrong MAC address for the ARP table.
Workaround: Execute the cable source-verify dhcp server x.x.x.x command, where x.x.x.x is your
DHCP server, and use cable arp filter to limit the potential ARP storm.
•
CSCsx56465
Symptoms: Wideband CMs using a stats index are not managed by the modular-host. This causes
two modems using the same Blaze header stats index, thus leading to incorrect downstream traffic
statistics on these modems.
Conditions: This issue occurs when there are wideband modems in the w-online state and a change
is made to the downstream channel ID of the MAC domain host of these wideband modems.
Workaround: There is no workaround.
•
CSCsx63989
Symptoms: The output of “sid” is incorrect in the show cable modem x.x.x.x service-flow
[verbose] command.
Conditions: This issue is seen in Cisco IOS Release 12.3(23)BC and Cisco IOS Release
12.2(33)SCB.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-107
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsx71837
Symptom: The title field “Name” in the show cable admission-control interface is missing.
Conditions: This is seen in the output of the show cable admission-control interface command.
Workaround: There is no workaround.
•
CSCsx72877
Symptoms: Traceback and IPC error messages may appear after the CMTS is loaded with the Cisco
IOS Release 12.2(33)SCB1 image.
Conditions: This issue is seen in routers running Cisco IOS Release 12.2(33)SCB1.
Workaround: There is no workaround.
•
CSCsx74271
Symptoms: The show pxf cable multicast-echo does not display the entire interface when the
subinterface is greater than 13 characters.
Conditions: This issue is seen for subinterfaces greater than 13 characters.
•
CSCsx79870
Symptoms: Modifying the second-choice-channel-width has no affect on the configuration even
though the cable upstream channel-width command accepts the input.
Conditions: This issue is seen in Cisco IOS Release 12.3BC.
Workaround: Modify the first-choice-channel-width, and then reconfigure the first and second
choice.
•
CSCsx80616
Symptoms: The packet drop counter is not getting updated in show interface service-flow counter
for single-session multicast service-flows
Conditions: This issue is seen in single session multicast service-flows.
•
CSCsx93455
Symptoms: No multicast-session is permitted when cable multicast authorization profile (mauth) is
enabled and the debug messages display “session limit reached”.
Conditions: This issue is seen in the following conditions:
– The CM comes online with max-session-zero cm-file
– Resetting the CM again with a non-mauth cm-file
– Enabling cable multicast authorization profile on CMTS
– Sending MLD/IGMP join matching default profile
– Session not being permitted irrespective of max-session limit and default action configured on
the CMTS
Workaround: Delete the cable modem and allow the modem to come online with second cable
modem configuration (non-mauth cm-file).
•
CSCsx94352
Symptoms: The wideband cable interface is not able to pass traffic.
Conditions: The issue occurs because the bonded channel-to-RF channel mapping configuration is
missing from the SPA.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-108
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no known workaround.
•
CSCsx97465
Symptoms: The CMTS may initiate DCC/DSA/DSC when Dynamic Bonding Change (DBC) is
outstanding.
Conditions: If the customer is running Video over DOCSIS (VDOC) and Cisco Load Balancing (or
CMTS initiated DSA) with a DPC3000, the CMTS makes VDOC higher priority over load balancing
(or CMTS-initiated DSA) when a DBC is outstanding. According to DOCSIS 3.0 specifications, the
CMTS must not issue a DCC or DSA/DSC command when it has previously issued a DBC command
and that command is still outstanding.
Workaround: There is no workaround.
•
CSCsx97488
Symptoms: CMTS does not reject the CM-initialized DSC/DSA messages during Dynamic Bonding
Change (DBC) or Dynamic Channel Change (DCC).
Conditions: This issue is seen if the customer is running Video over DOCSIS (VDOC) with a Cisco
DPC3000 cable modem, and the CM is making a DSA call. The CMTS responds with a confirmation
code of “reject-temporary” for the DSA-REQ or DSC-REQ for Annex B.
Workaround: There is no workaround.
•
CSCsy05768
Symptoms: After issuing the no cable trust command on the active PRE module, that same
command is not removed from the standby PRE module and as a result the active and standby PRE
modules are out of sync.
Conditions: This behavior is only seen if the MAC address used in the cable trust command does
not exist in the CMTS.
Workaround: There is no workaround.
•
CSCsy07513
Symptom: Traffic does not resume after a PRE module switchover and modems are not accessible
after a PRE module switchover.
Conditions: This issue occurs after a PRE module switchover and “cef”is not running in the standby
PRE module.
Workaround: There is no workaround.
•
CSCsy09588
Symptoms: After unconfiguring the cable source-verify dhcp command, the “SrcVfy” field
continues to display “On”.
Conditions: This is seen when the cable ipv6 source-verify and cable source-verify dhcp
commands are configured on the same bundle interface, and when the cable source-verify dhcp
command is unconfigured before the cable ipv6 source-verify command.
•
CSCsy09861
Symptoms: Upstream-and-downstream-related tables are not retrieved while querying via SNMP.
Conditions: This issue is seen while querying via SNMP.
Workaround: There is no workaround.
•
CSCsy13870
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-109
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: When configuring cable upstream threshold cnr-profile snr-profile, the parser shows
and accepts the second threshold value. It does not give an error message, and does not display the
configuration with only the first threshold value.
Conditions: This issue is seen while configuring the CNR and SNR thresholds for modulation
profiles.
Workaround: Either enter any valid threshold value or “0” to bypass.
•
CSCsy14105
Symptoms: The value range of the MIB object “ccmtrCollectionInterval” is not consistent with the
command. The valid range for MIB object is 15 to 1440, but for the command, the range is 2 to 1440.
Conditions: This issue occurs while setting the MIB object “ccmtrCollectionInterval” using the
SNMP set operation.
Workaround: Set the interval using the command.
•
CSCsy14569
Symptoms: A memory leak was observed after deleting the subinterface.
Conditions: This issue is seen while deleting a subinterface.
Workaround: There is no workaround.
•
CSCsy16511
Symptoms: When applying modulation profiles to an upstream port, the modulation profiles are
re-ordered, high performance to robust/low performance. Modifying the order of the
modulation/symbol rate on the profile does not happen.
Conditions: If the signal-to-noise ratio (SNR) threshold is set at 25 with a hysteresis of 2 (bypassing
all FEC), the modulation on the upstream will be QPSK until the SNR falls below 25 dB where it
will change to 16-QAM. When the SNR reaches 27 dB (25 dB + 2 dB), the modulation reverts to
QPSK. When a line card switchover is performed, the modulation profiles are re-ordered on the
protect card.
Workaround: Remove and re-apply modulation-profile configuration on the upstream port after
modifying the modulation profiles.
•
CSCsy18380
Symptoms: All CMs on adjacent downstreams are offline. The adjacent downstream ports are 0 and
1, or 2 and 3, or 4.
Conditions: The downstream ports that share JIB may be nonfunctional if the JIB that services both
downstream ports is locked.
Workaround: Reload the cable line card.
•
CSCsy19698
Symptoms: A memory leak was observed after executing the multicast test case.
Conditions: This issue is seen when the cable multicast group-qos and cable multicast qos group
priority commands are unconfigured.
Workaround: First unconfigure the session-range using the cable multicast qos group priority
command.
•
CSCsy20664
Symptom: Removing the line card configuration causes %LINEPROTO-5-UPDOWN and scm sum
total, scm vendor sum, and scm show modem commands show no CMs.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-110
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This is seen when line card high availability is removed and while executing scm sum
total, scm vendor sum. and scm show modem commands.
Workaround: There is no workaround.
•
CSCsy21280
Symptoms: PXF forwards traffic up to 300 Mbps to the Route Processor (RP) using 1500-byte IPv6
packets.
Conditions: This issue occurs when Physical Logical Bandwidth Limiting Traffic (PBLT) for the RP
CPU queue is set to 300 Mbps. The show pxf cpu queue command displays this information.
Workaround: Change the value to 44 Mbps (DS3 Bandwidth) for the PRE2 processor module and
1.6 times 44 Mbps for the PRE4 processor module.
•
CSCsy23149
Symptoms: The MIB object “entPhysicalName” for the Cisco uBR10012 router does not display the
values correctly. The values as displayed as slot 0/0/0 and slot 0/1/0 for the PRE processor modules
instead of being displayed as 0A and 0B from left to right. Similarly, the MIB object
“entPhysicalName” returns slot x/x/x (for example, 1/0/0) instead of the values displayed in the
device.
Conditions: This issue occurs while querying the MIB object “entPhysicalName”.
Workaround: There is no workaround.
•
CSCsy33496
Symptoms: When applying new RF channels in Cisco IOS Release 12.2(33)SCB, a corresponding
modular-cable interface is created. These interfaces appear under router RIP, router OSPF, and
router isis routing protocol processes as “no passive-interface”, even when passive-interface
default is configured. Cable, modular-cable, and wideband interfaces should not appear under a
routing protocol process as there is no Layer 3 control.
Conditions: The creation of new cable bundle interfaces is configured rightly using the
passive-interface default command. Because there is no Layer 3 control on cable, modular-cable,
or wideband cable interfaces, such a problem with the Layer 2 interfaces appearing as “no
passive-interface” does not lead to improper routing protocol control, but this can create some
confusion even though the issue is cosmetic.
•
CSCsy37677
Symptoms: A crash is observed on the CMTS.
Conditions: This issue is seen in cases ETDB show commands are paused and multicast sessions
removed because a CPE leave or a CM goes offline.
Workaround: Set the term length to 0 for no pausing while displaying the command.
•
CSCsy41478
Symptoms: The CMTS allows any upstream to be attached to any connector without any warning
message. A “no” is displayed for the conflicting connector.
Conditions: This issue is seen when a new card is plugged into a slot with no pre-configuration.
Workaround: Reload the line card or use default connectors.
•
CSCsy42532
Symptoms: The range for Security Association Identifier (SAID) is not correct. The correct range
should be 8192 to 12272.
Conditions: This issue is seen in routers running Cisco IOS Release 12.2(33)SCA.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-111
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsy47122
Symptoms: Different values for the MAC Domain Downstream Service Group (MD-DS-SG) are
seen after an RPR switchover, using the show cable modem wideband and show cable
mac-domain downstream-service-group commands.
Conditions: This issue occurs while changing the MD-DS-SG by changing the fiber node when
CMTS is up and after a RPR switchover.
Workaround: There is no workaround. This symptom is not critical. It does not affect normal use of
relative features.
•
CSCsy54558
Symptoms: The PRE4 processor module rate shaping allows the traffic throughput on a service flow
to exceed its maximum rate.
Conditions: This issue is seen on PRE4 processor module best effort service flows.
Workaround: There is no workaround.
•
CSCsy55647
Symptoms: A crash is observed on the ESR-PRE2 processor module. The crash information logs
may contain the following:
%UBR10K-6-US_SFID_INCONSISTENCY: US-SF found: SFID xxxx, type 0, sid 0(yyyy), MAC
aaaa.aaaa.aaaa(bbbb.bbbb.bbbb), prim_sid xxx(yyy)CMD: 'no cable service attribute
voice-enabled downstream-type HA-capable'
Conditions: This issue is seen in Cisco IOS Release 12.3(23)BC4 and Cisco IOS Release
12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsy55849
Symptoms: The show controller modular-cable command output displays invalid voltage
measurement readings for the 24 rf-channel SPA.
Conditions: This is seen on the 24 rf-channel SPA.
Workaround: Re-execute the show controller modular-cable command.
•
CSCsy56966
Symptoms: The cable monitor duplicates one more MAC Domain Descriptor (MDD) for every
generated MDD if it is configured to monitor cm_multicast_addr(01e0.2f00.0001).
Conditions: This issue is seen when cm_multicaset_addr(01e0.2f00.0001) is configured.
Workaround: Configure the paktype mac command to capture MAP/MDD/UCD.
•
CSCsy59457
Symptoms: After a reload, cable metering source-interface FastEthernet0/0/0 is not present at the
running configuration, although cable metering filesystem disk0: cpe-list-suppress and cable
metering source-interface FastEthernet0/0/0 were configured.
Conditions: This issue is seen only in Cisco IOS release versions on the PRE2 processor module.
Workaround: There is no workaround.
•
CSCsy62721
Symptoms: Delays occur in calls after a failover from a Cisco uBR10-MC5X20S card to a Cisco
uBR10-MC5x20H card.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-112
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen in a Cisco uBR10012 router running Cisco IOS Release
12.2(33)SCB1 and configured for N+1 Redundancy and after a failover of a Cisco
uBR10-MC5X20S card to Cisco uBR10-MC5X20H card. A call take approximately 20 seconds to
successfully hang up. Before that period, if the handset is placed on the hook and then picked up,
dial tone would not be heard.
Workaround: There is no workaround.
•
CSCsy68856
Symptoms: The active DOCSIS queues remain active in the event of a DOCSIS SPA failure.
Conditions: If there are modems online and passing traffic on the modular-cable and/or on
wideband-cable interfaces and the DOCSIS SPA fails, the DOCSIS queues associated with these
online modems remain active attempting to dequeue.
Workaround: There is no workaround.
•
CSCsy72009
Symptom: When attempting to upgrade a Cisco uBR10012 router from Cisco IOS Release
12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the primary PRE may crash.
Conditions: This issue is seen when the CMTS is running Cisco IOS Release 12.3(21)BC and while
upgrading to Cisco IOS Release 12.2(33)SCB. The CMTS must then be powered down and
physically reconfigured to run as a M-CMTS (Cisco SIP-600 inserted, WB SPAs inserted, DTCCs
inserted, so on.). Lastly, the CMTS must be turned on to run its new Cisco IOS Release 12.2(33)SCB
IOS image and physical configuration.
•
CSCsy72030
Symptoms: The RFGW-1 reports channel(s) as down following rf-channel and fiber node
configuration changes.
Conditions: This issue is seen when there are changes made to the rf-channel/fiber node
configuration on the RFGW-1. It reports the affected channels as DOWN.
Workaround: Exit fiber node configuration level and the changes are be committed and the
rf-channel status as reported by the RFGW-1. It shows the correct state.
•
CSCsy72055
Symptoms: When attempting to upgrade a Cisco uBR10012 router from Cisco IOS Release
12.3(21)BC to Cisco IOS Release 12.2(33)SCB, the secondary PRE processor module may crash
directly after the primary PRE processor module crashes.
Conditions: This issue occurs in routers running Cisco IOS Release 12.3(21)BC.
•
CSCsy79526
Symptoms: Modems marked by “tftp-enforce mark-only” show up in show cable modem as marked
with the # sign. Syslog messages might report that the modem was marked as follows:
SLOT 6/1: Mar 25 12:21:58.967 CDT: %UBR10000-4-REGISTRATION_BEFORE_TFTP_MARK:
Registration request unexpected: Cable Modem did not attempt TFTP. Modem marked with
#. CM Mac Addr
But the modem does not show up with the “#” in front of the online status in show cable modem
command.
Conditions: This is seen in routers running Cisco IOS Release 12.2(33)SCB1.
Workaround: There is no workaround.
•
CSCsy81688
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-113
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: The show facility-alarm status command displays a false alarm.
Conditions: This issue is seen for the protect line cards when connectors are not set.
Workaround: There is no workaround.
•
CSCsy86273
Symptoms: When a bundle subinterface number is greater than 64K, the statindex assignment for
multicast session shows 0.
Conditions: This is a rare situation and only happens when a subinterface number is greater than
64K.
Workaround: Use a smaller subinterface number.
•
CSCsy90276
Symptoms: The CMTS sends DBC to the CM to change the primary downstream port
Conditions: This issue is seen when the VDOC broadcast feature is configured such that multiple
RCCs in the same MAC domain have exact same frequencies for the primary bonding group, but the
primary frequency is different. For example, if you have frequencies f1 and f2 as the primary
bonding group frequencies, then rcc1 (f1f2f3) and rcc2 (f1f2f4) have the first two frequencies as
f1f2, while rcc3 (f2f1f3) and rcc4 (f2f1f4) have the first two frequencies as f2f1. With this
configuration, the CM is first online using rcc3 and the CPE sends an IGMP join for the channel
corresponding to f3.
Workaround: For the VDOC broadcast feature, configure RCC templates such that a set of primary
bonding group frequencies are in the same order in all RCC templates.
•
CSCsy93201
Symptoms: Facility alarms are incorrectly generated for cable line card interfaces.
Conditions: This issue occurs when line card redundancy is configured or upstream frequency
stacking is configured.
Workaround: There is no workaround.
•
CSCsy93204
Symptoms: Executing the cmts walk command on ARP table causes high CPU utilization. This is
also seen while using the snmp walk command on the ARP table.
Conditions: This issue occurs while using the cmts walk and snmp walk commands.
Workaround: To prevent high CPU utilization when using the snmp walk command, use snmp view
commands:
snmp-server view cutdown iso included
snmp-server view cutdown at excluded
snmp-server community public view cutdown ro
snmp-server community private view cutdown rw
•
CSCsy93613
Symptoms: DMIC code is being corrupted due to a DHCP packet.
Conditions: This issue seen on PRE2 processor module running Cisco IOS Release 12.3(23)BC2.
Workaround: There is no workaround.
•
CSCsz02935
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-114
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Although the CM is in non-BPI mode, after line card high availability, its downstream
packet or the ping are still encrypted and fail.
Conditions: This issue is seen in the following conditions:
– System has line card high availability configured, BPI setup and he CM is online (pt) or
w-online (pt).
– Change the CM configuration file to non-BPI.
– Reset the CM using the command.
Workaround: After the change to non-BPI configuration, use the delete command instead of reset.
•
CSCsz03046
Symptom: The CM goes offline after line card fails with different types of working and protect line
card (for example, Cisco uBR10-MC5X20H protect and Cisco uBR10-MC5X20U line cards)
Conditions: This issue occurs when a manual line card switchover is done and when a new active
line card crashes or reboots before HCCP Static Sync is done.
Workaround: There is no workaround.
•
CSCsz07900
Symptoms: The multicast traffic is not forwarded by the CMTS to the multicast clients after the
IGMP join request is sent by the client. The “packets received” counter keeps increasing, but the
“packets forwarded” counter stops increasing
Conditions: The issue is seen with Cisco uBR10-MC5X20H line cards with multicast configuration
enabled.
Workaround: Configure the ip igmp version 3 command in the bundle interface associated with the
multicast traffic forwarding line card.
•
CSCsz16909
Symptoms: When the upstream service flow of modem exceeds the 1 MB limit on a Cisco DPC3000
cable modem, no traffic can be sent.
Conditions: This happens when the upstream traffic is sent at 1 MB or above.
Workaround: There is no workaround.
•
CSCsz20582
Symptoms: After a line card switchover the key-index becomes 0 for a multicast QoS that is
configured for a active static IGMP session along with encryption.
Conditions: This issue is seen only for static IGMP groups which has multicast QoS with encryption
configured.
Workaround: There is no workaround.
•
CSCsz20999
Symptoms: An unused Downstream Service Identifier (DSID) and statsindex is shown in the show
cable multicast dsid command. The Service Flow Identifier (SFID) value displays “0” in the show
interface multicast-session command.
Conditions: This happens when admission control checks fails at the cable line card (CLC) during
multicast service flow creation.
Workaround: There is no known workaround.
•
CSCsz23805
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-115
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: If a modular-cable channel with online modems is removed from its host and
reconfigured to another host, the flows counter are incorrectly displayed.
Conditions: This is seen when a modular-cable channel is removed from its host and reconfigured
to another host.
Workaround: There is no workaround.
•
CSCsz25605
Symptoms: The Gigabit Ethernet interface on an ESR-1GE may fail to send packets.
Conditions: This might be seen just after executing online insertion and removal (OIR) of an
ESR-1GE with low rate.
Workaround: Execute the hw-module slot reset command.
•
CSCsz26989
Symptoms: The multicast packets are forwarded to a cable downstream interface that is in
rf-shutdown state.
Conditions: This issue occurs if the cable interface is in rf-shutdown state and multicast traffic is
forwarded to that interface unnecessarily.
Workaround: There is no workaround.
•
CSCsz27774
Symptoms: The fiber node accepts non-existent upstream connectors, which may confuse the user
on physical and logical topology.
Conditions: This issue occurs when configuring non-existent upstream connectors on the fiber node.
Workaround: Do not configure non-existent upstream connectors for the fiber node.
•
CSCsz31811
Symptom: The CMTS causes high CPU utilization on the IPDR/SAMIS collector by sending
multiple records for a flow with the same creation time.
Conditions: The service flow export and service flow deletion occur at the same time.
Workaround: There is no workaround.
•
CSCsz32299
Symptoms: Multicast traffic forwarding stops on modular cable interfaces.
Conditions: This issue occurs on modular downstream interfaces with multicast QoS functionality
configured and the Parallel Express Forwarding (PXF) on the CMTS has restarted.
Workaround: In case of a static multicast, unconfigure and reconfigure the ip igmp static-group
commands. In case of dynamic multicast, use the clear ip mroute command.
Workaround: There is no workaround.
•
CSCsz36987
Symptom: Logged messages are sent not only to the IOS system log in memory on the Cisco
MC5X20 line cards, but to the console serial port. This I/O activity uses CPU resources
unnecessarily especially at card bootup time. Console logging may be re-enabled by configuring the
logging console command.
Conditions: This issue is seen in all Cisco uBR10-MC5X20 line cards.
•
CSCsz37891
Symptoms: The Cisco uBR10012 router crashed because it ran out of un-fragmented memory.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-116
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This is seen in Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsz38521
Symptom: The DOCSIS Timing, Communication and Control (DTCC) card information is
displayed in the output of the show diagnostic command when the card is not present.
Conditions: This issue is seen when both SPA cards are present in the slot/subslot and utility cards
are present in slot/subslot. For example, a SPA is present in 1/1 and a DTCC card is present in 1/1.
Workaround: There is no workaround.
•
CSCsz44314
Symptoms: Stale multicast BPI encryption keys remain on protect line cards that are in standby
state.
Conditions: This issue is seen while joining and leaving a multicast group (present in cable match
command). Conduct a line card switchover from working to protect and then revert back to working
from protect.
Workaround: There is no workaround.
•
CSCsz50204
Symptoms: A multicast QoS session is not automatically created when changing group
configuration or GQC.
Conditions: This issue is seen when a multicast QoS group is configured on a bundle interface and
a matching static-group is defined. However, any change in the group configuration after it is applied
to the bundle interface is not taken into effect, and the original multicast QoS session is removed.
Workaround: Remove the multicast QoS session from the bundle interface and re-apply it to the
bundle.
•
CSCsv53276
Symptoms: The show controller modular-cable 1/0/0 command displays that rf-channel 0 becomes
unknown after a SPA hw-module reset.
Conditions: This issue occurred executing the hw-module reset and show diagnostic 1/0/0
commands. This causes all wideband modems also to go online.
Workaround: Reload the router to fix the issue.
•
CSCsz53710
Symptom: The Multimedia Terminal Adapter (MTA) lacks IP connectivity and cannot be reached.
Conditions: This is seen when upgrading to Cisco IOS Release 12.2(33)SCB2.
Workaround: Reset the MTA.
•
CSCsz56707
Symptom: The “PXF DMA Cumulative Ironbus Error Statistics” values are incriminated when
executing the show pxf dma counters | include Ironbus command. For example, the error statistics
displayed are:
PXF DMA Cumulative Ironbus
Ironbus Event 1/0:
Ironbus Event 1/1:
Ironbus Event 2/0:
Ironbus Event 2/1:
Ironbus Event 3/0:
Ironbus Event 3/1:
Error Statistics:
0
166
2843674
2843674
70
67
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-117
Chapter 2
Ironbus
Ironbus
Ironbus
Ironbus
Ironbus
Ironbus
Ironbus
Ironbus
Ironbus
Ironbus
Event
Event
Event
Event
Event
Event
Event
Event
Event
Event
4/0:
4/1:
5/0:
5/1:
6/0:
6/1:
7/0:
7/1:
8/0:
8/1:
Caveat List for Cisco IOS Release 12.2(33)SCB
63
64
241
2843674
278
268
250
269
2843674
1580072
Conditions: The above errors are observed on a Cisco uBR10012 router with a PRE2 processor
module running Cisco IOS Release 12.2(33)SCB1 and Cisco IOS Release 12.2(33)SCB2.
Workaround: There is no workaround.
•
CSCsz57079
Symptoms: The Arris Embedded Multimedia Terminal Adapter (EMTA) modems do not get a dial
tone after a PXF crash.
Conditions: This issue is seen on a Cisco uBR10012 router running Cisco IOS Release
12.2(33)SCB2. This is seen after a PXF crash and when the Arris modems are in the “In Progress
Telephony-DHCP” state.
Workaround: Switch over to the standby PRE module and execute the clear cable modem
command.
•
CSCsz59839
Symptoms: A line card switchover from a Cisco uBR10-MC5X20U card to a Cisco
uBR10-MC5X20H card causes only Cisco DPC3000 modems to go offline.
Conditions: This issue is seen in Cisco DPC3000 cable modems.
•
CSCsz62620
Symptoms: During the VDOC video channel changes, it is possible that the multicast QoS service
flow cannot be created because a stale multicast QoS service flow exists for 140 seconds after the
last IGMP member. This prevents a new multicast QoS service flow from being created.
Conditions: This is seen in multicast QoS service flows.
•
CSCsz67716
Symptoms: The “Gate Report State” counter in the output of the show packetcable cms verbose
command does not increment for PacketCable Multimedia (PCMM) policy servers.
Conditions: This issue is seen for PCMM policy servers.
Workaround: There is no workaround.
•
CSCsz67961
Symptoms: The PacketCable Multimedia (PCMM) calls fail as the Gate Set Ack/Err is not received.
Conditions: This issue is seen in PCMM calls with a small value used for timer T1 (such as 1
second).
Workaround: Use larger values for the PCMM timer T1 (at least 5 seconds).
•
CSCsz70939
Symptoms: A a long latency for VDOC video channel change is seen as the Dynamic Bonding
Change (DBC) timer restricts the CMTS to have another transaction on the same CM.
Conditions: This is seen due to the DBC timer value.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-118
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Lower the T10 timer to 10 ms.
•
CSCsz73611
Symptom: CMTS will accept inconsistent “per-SF L2VPN TLV” in the cable modem configuration
file.
Conditions: This is seen in the following conditions:
– Upstream service flow (US-SF) or Downstream Confirmation-to-Receive (DS-CFR) Vendor
Specific TLV is specified.
– L2VPN vpnid is specified in the Vendor Specific TLV.
– The Vpnid does not match any of the top-level L2VPN TLV vpnid.
Workaround: There is no workaround.
•
CSCsz74407
Symptom: The Policy Based Routing (PBR) functionality (set ip next-hop and set ip default
next-hop) does not work with the PRE4 processor module.
Conditions: This is seen in the PRE4 processor module.
Workaround: There is no workaround.
Resolved Caveats — Cisco IOS Release 12.2(33)SCB3
•
CSCsh40309
Symptoms: While viewing a modem upstream trace with Cisco Broadband Troubleshooter Release
3.2, the burst is not be displayed when equalization is configured on the US port. This seems to be
happening with the Cisco uBR10-MC5X20S and Cisco uBR10-MC5X20U cards only.
Conditions: This issue is only on the Cisco uBR10-MC5X20S and Cisco uBR10-MC5X20U cards
and when PRE-EQ (equalization-coefficient) is configured.
Workaround: Do not configure the PRE-EQ feature. This feature is off by default.
•
CSCsr43381
Symptoms: A PRE module failover can result in tracebacks and errors when the DOCSIS trust points
are configured.
Conditions: Simply attempting a failover will result in failure.
Workaround: Remove the trustpoint keys for the DOCSIS-US-TRUSTPOINT and
DOCSIS-EU-TRUSTPOINT. This keeps the trustpoints in place but does not associate any crypto
keys with it.
•
CSCsu08256
Symptoms: The Cisco uBR10-MC5X20H card reloaded during forced line card failover.
Conditions: This is seen in the Cisco uBR10-MC5X20H.
Workaround: There is no workaround.
•
CSCsu31549
Symptoms: When a router (with a large-scaled configuration) is provisioned to perform a PRE
module failover and a PXF crash occurs (for example, issuing a switchover pxf restart 1 0
command), this could result in missed IPC keepalives and a large crash information file being
written, causing unexpected behavior including line card reloads.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-119
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen in a router that has a large configuration and has redundancy, mode
switchover, main-cpu and switchover pxf restart 1 0 commands configured.
•
CSCsu64215
Symptoms: The ip tcp adjust-mss command results in packet loss for non-TCP traffic.
Conditions: This issue is seen when using the ip tcp adjust-mss command.
Workaround: Disable ip tcp adjust-mss on all interfaces in the device. This may cause higher CPU
due to fragmentation and reassembly in certain tunnel environments where the command is intended
to be used.
•
CSCsv52737
Symptoms: The Cisco uBR10012 router does not properly re-initialize the sequence number field in
the downstream extended header of the first packet transmitted on a newly created re-sequencing
Downstream Service Identifier (DSID). The CMTS must use a Packet Sequence Number of zero (0)
in the DS EHDR of the first packet transmitted on a newly created re-sequencing DSID.
Conditions: This is seen in wideband when multiple downstream primary and secondary flows are
used.
Workaround: There is no workaround.
•
CSCsv64884
Symptoms: An SNMP v3 walk with authentication does not complete against a virtual switch system
(VSS).
Conditions: This issue occurs on an SNMP v3 walk with authentication on a VSS.
•
CSCsv88650
Symptoms: Modems on a modular interface suffer long-time recovery time or even fall offline after
switchover or revertback.
Conditions: This only affects Cisco uBR-MC5X20S/U card as the active card. It affects modems on
the modular interface and is more visible for Annex A modulation type.
Workaround: There is no workaround.
•
CSCsw14433
Symptoms: On the Cisco uBR10012 platform, during PRE module runversion of the ISSU upgrade
process, the IPC connection between the RP and the cable line cards may take additional seconds to
come up.
Conditions: This issue happens during PRE module runversion.
Workaround: There is no workaround.
•
CSCsw19431
Symptoms: A warning message such as the one below is erroneously printed during ISSU, even
when actual CPU utilization is not high:
%HCCP_LC_ISSU_SHIM-3-RP_HIGH_CPU_UTILIZATION: High CPU utilization on PRE, line card
ISSU may fail.
Conditions: This happens during ISSU load version.
•
CSCsw24542
Symptoms: A crash occurs due to a bus error after displaying the following error messages:
%DATACORRUPTION-1-DATAINCONSISTENCY: copy error,
%ALIGN-1-FATAL: Illegal access to a low address < isdn function decoded>
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-120
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This crash first was seen on a Cisco 3825 running Cisco IOS Release12.4(22)T with
ISDN connections going on. At the moment of the crash, the customer was monitoring the router
using an SNMP Get program. After some minutes, the router reloaded by itself.
Workaround: There is no workaround.
•
CSCsw26022
Symptoms: A memory leak at buffer_peak_notify is observed.
Workaround: There are no workarounds.
•
CSCsw29191
Symptom: When Three Way Calling (TWC) is used, the admitted service flow of the on-hold side
still has traffic going through.
Conditions: This is seen in three-way calling when one side is on hold. This is seen in Cisco IOS
Release 12.3(23)BC and Cisco IOS Release 12.2(33)SCB release.
Workaround: There is no workaround.
•
CSCsw35917
Symptoms: The SP messages can get logged on the RP console but are not sent over as SNMP traps
by the RP SNMP agent.
Conditions: This was first seen in Cisco IOS Release 12.2(18)SXF.
Workaround: There is no workaround.
•
CSCsw52539
Symptoms: Cable metering collection enters the “write-error” state and does not recover.
Conditions: This issue occurs when cable metering is configured with default TCP parameters.
Workaround: Enabling “ip tcp path-mtu-discovery” may help prevent occurrences of the issue. Also,
the test cable metering abort command will clear the “hung” state and allows the next iteration of
cable metering to occur.
•
CSCsw89288
Symptoms: The show interface cable x/y/z sid command shows null MAC address and null IP
address SID entries. The show cable modem summary total command reports many more offline
modems than are actually offline.
Conditions: This is observed in Cisco IOS Release 12.2(33)SCB.
Workaround: Clear the offline modems using the clear cable modem offline delete command. This
issue is cosmetic.
•
CSCsx11558
Symptoms: A cable modem may disappear after a line card switchover.
Conditions: This issue occurs when configuring the member subslob x/y working command and
when this configuration already exists and the working card x/y has downstream modular a/b/c RF
configured.
Workaround: Execute a shutdown command followed by a noshutdown command on the
corresponding modular interface.
•
CSCsx16152
Symptoms: Erroneous routing prefixes may be added to the routing table.
Conditions: This is seen when the DHCPv6 relay feature is enabled and a router receives a normal
DHCPv6 relay reply packet, and this may lead to an erroneous route being added to the routing table.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-121
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsx20193
Symptoms: When issuing the show cable multicast db command with a page break, there may be
a crash when there are IGMP activities undergoing.
Workaround: Use the term len 0 to print all data at one time to prevent this race condition.
•
CSCsx34107
Symptom: The following warning is seen when wideband (WB) resiliency is enabled, and the
modem is moved from WB to NB.
%GENERAL-2-CRITEVENT: Request CIR exceeds available link rate.
%UBR10K-3-QALLOCFAIL: Failure to allocate QoS queue for service flow 34, CM
001e.6bfa.f67a
Conditions: This issue is seen when wideband (WB) resiliency is enabled. The primary WB channel
fails to work, and the modem is removed from WB to NB to recover service. The modem is
configured with non-zero CIR. The NB reserved bandwidth is not enough to add a new modem.
Workaround: Disable WB resiliency.
•
CSCsx44842
Symptoms: After clearing all modems on c5/0/0, statistics on SPA downstream service flows may
not work correctly.
Conditions: This issue is seen while executing the clear cable modem command causing the SPA
statistics information on the SIPs to be removed.
•
CSCsx45807
Symptoms: The IPDR can trigger high RP CPU utilization when entries in the service flow log table
time-out, and the data is written to the disk.
Conditions: This issue is seen when IPDR uses the file system for the deleted service flow
information if the cable sflog command is configured such that the entry-duration is too short or the
number of entries is too low.
Workaround: Prevent storage of deleted service flows on the disk by using the recommended
configuration of the cable sflog command. The entry duration should be at least four times the
metering interval and the max-entry should be large enough to store the deleted flows that exist in
a metering interval.
cable metering destination < retries> 15 non-secure
cable sflog max-entry 30000 entry-duration 3600
With the metering interval at 15 minutes, the service flow log should be at least 1 hour or 3600
seconds. The high CPU occurs when the file system is full, and attempts to write are continued.
•
CSCsx55253
Symptoms: Multiple memory leaks are seen at Cisco 10000 router On Board Failure Logging
(OBFL) process.
Conditions: This is seen in the Cisco 10000 router OBFL process.
•
CSCsx56056
Symptoms: The CMTS metering collection process on the line card or Route Processor (RP) gets
terminated after the metering is completed. If destination-based CMTS-metering is enabled, and the
export fails, a traceback is received around the data collection intervals. No tracebacks are reported
if the export succeeds.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-122
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This could be an issue in the production environment. If the destination collector stops
responding on the port or if it is unavailable, then a traceback is received on the CMTS.
•
CSCsx56108
Symptoms: When a PRE processor module switchover occurs, the diagnostic log gets blocked for
several hundred milliseconds.
Conditions: This occurs when a PRE processor module switchover occurs with multiple line cards
installed.
Workaround: There is no workaround.
•
CSCsx56318
Symptoms: The Cisco uBR10012 router is returning docsIf3CmtsCmRegStatusIPv6Addr as a
string. This value should be in hexadecimal.
Conditions: This issue occurs if the modem does not have an IPv6 address. The default IPv6
addresses are displayed as a string.
Workaround: There is no workaround.
•
CSCsx57029
Symptoms: An incorrect MAC address or IP address is obtained when the show cable mode [mac |
ip] access-group command is executed.
Conditions: This is seen in Cisco IOS Releases 12.3(23)BC and Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsx58991
Symptoms: The protect line card is showed as revertive in the show hccp detail command when no
member subslot x/y revertive is configured.
Conditions: This issue is seen when line card redundancy is configured and after removing the
working line card configuration and reconfiguring it.
Workaround: Reconfigure the no member subslot x/y revertive command.
•
CSCsx64462
Symptoms: Unintentional reset of the Cisco SIP-600 card can occur if the show controller
command is executed and there is a Cisco Wideband SPA card that is currently in a state of
initialization.
Conditions: This is seen if there is a SPA in a Cisco SIP-600 card that is in the process of being
initialized.
Workaround: Do not execute the show controller command if there is a Cisco SIP-600 card with a
SPA that is in the process of being initialized
•
CSCsx67030
Symptoms: The following traceback is seen when getting docsIfDownstreamChannelEntry:
SLOT 5/0: 00:09:18: %ALIGN-3-SPURIOUS: Spurious
reading 0x2B0
SLOT 5/0: 00:09:18: %ALIGN-3-TRACE: -Traceback=
60519EBC 60519538 6050A97C 6050AB9C
SLOT 5/0: 00:09:18: %ALIGN-3-TRACE: -Traceback=
60519EBC 60519538 6050A97C 6050AB9C
SLOT 5/0: 00:09:18: %ALIGN-3-TRACE: -Traceback=
60519EBC 60519538 6050A97C 6050AB9C
SLOT 5/0: 00:09:18: %ALIGN-3-TRACE: -Traceback=
60519EBC 60519538 6050A97C 6050AB9C
memory access made at 0x6061A388
6061A388 60334794 6061D31C 606200D0
6061A390 60334794 6061D31C 606200D0
6061A3B4 60334794 6061D31C 606200D0
6061A3C8 60334794 6061D31C 606200D0
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-123
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This is seen when the broadband innovation upconverter is used.
Workaround: There is no workaround.
•
CSCsx69554
Symptoms: Frequency range overlapping occurs.
Conditions: This is seen when cable freq-range north-american/european is configured on the
CMTS.
Workaround: Do not configure the cable freq-range north-american/european command in global
mode.
•
CSCsx76442
Symptoms: After a PRE processor module failover, certain modems and their CPEs are not
reachable by their IP addresses.
Conditions: This is seen in Cisco uBR10012 router with the ESR-PRE2.
Workaround: Fail over to original PRE processor module or execute the clear cable modem delete
command on the affected modem.
•
CSCsx77548
Symptoms: Configuring more than four upstream channels in one downstream may cause a crash on
the CMTS.
Conditions: This issue is seen while configuring more than four upstream channels in one
downstream and when a UGS_AD service flow is used.
Workaround: Do not configure more than four upstream channels in one downstream.
•
CSCsx77543
Symptom: If Dynamic Message Integrity Check (DMIC) is configured in conjunction with IPv6
enabled CMs, the PRE will crash with the following message:
*** System received a Bus Error exception ***
signal= 0xa, code= 0x8, context= 0x6493a1a4
PC = 0x60a49ad0, Cause = 0x420, Status Reg = 0x34008002
System Bootstrap, Version 12.0(20020314:211744) [REL-pulsar_sx.ios-rommon 112],
DEVELOPMENT SOFTWARE
Copyright (c) 1994-2002 by cisco Systems, Inc.
Reset Reason Register = RESET_REASON_RESET_REG (0x76)
C10000 platform with 1044480 Kbytes of main memory
Conditions: This issue is seen when DMIC is configured in conjunction with IPv6-enabled CMs.
•
CSCsx77978
Symptoms: The downstream load is not balanced when downstream load balancing group (DS LB)
is configured with us-across-ds policy.
Conditions: This is seen when us-across-ds policy is configured on DS LB group.
Workaround: Do not configure us-across-ds policy on DS LB group.
•
CSCsx79753
Symptoms: An error “%GENERAL-2-CRITEVENT: MRI Unlink Error: Cable”, is seen in the
system logs for different CMs.
%GENERAL-2-CRITEVENT: MRI Unlink Error: Cable6/0/3 cpe_info->name: Cable8/1/3 current
sid: 1464 cpe_info->sid: 1922
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-124
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
current mri: 472 cpe_info->mri: 472
modem->mac_addr: 001a.ad90.be36 cpe_info->mac_addr: 001a.ada7.c1a6
Current IP address: 78.94.54.211 cpe_info->ipaddress: 10.80.64.206
cpe_info->next_slot: 1048576
cpe_sidinstp: 0x0 cpe_sidinstp->prim_sid: 65535 cpe_sidinstp->cm_macaddr:
0000.0000.0000
Conditions: This issue is seen on the Cisco uBR10012 router.
Workaround: There is no workaround.
•
CSCsx79863
Symptoms: The calculated channel utilization percents can become inaccurate. The short term
utilization seen via the output of the show interface cable X/Y/Z mac-scheduler command, shows
the “Avg upstream channel utilization” value 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: This issue is seen when “rate-adapt” is configured for a particular upstream channel
under certain configured conditions. The MAC scheduler for that upstream allocates additional data
grants to one or more cable modems in a given MAP message. When the data grants go unused by
the cable modems, the utilization calculations made by the scheduler become skewed.
Workaround: There is no workaround.
•
CSCsx80261
Symptoms: The MAC Domain x/y/z interface loses modular-cable configuration.
Conditions: This is seen after a Cisco uBR10012 router bootup.
Workaround: There is no workaround.
•
CSCsx80610
Symptoms: A remote primary wideband cable modem sometimes forwards primary downstream
service-flow traffic from a secondary wideband interface.
Conditions: This issue occurs in a remote primary wideband cable modem.
Workaround: There is no workaround.
•
CSCsx81399
Symptoms: The LED on the HCCP-protected downstream port lights up even when the protected
downstream port is in standby mode.
Conditions: This is seen on a Cisco uBR10012 router with HCCP protect.
Workaround: There is no workaround.
•
CSCsx96155
Symptoms: After changing the load-interval on the RP, the interface load-interval on the line card
does not change. This results in the utilization of load balancing updated using the default interval.
Conditions: This is seen while changing the load-interval on the legacy cable interface.
Workaround: There is no workaround.
•
CSCsy05419
Symptoms: An error message is displayed when the terminal monitor is enabled instead of
displaying an error message when a terminal monitor is not present. The error message that needs
to be displayed as follows:
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-125
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
000715: Feb 25 18:35:51.554: %Advanced Spectrum Management does not support three
Modulation Profile configurations. Modulation Profile 221 has been removed from the
Dynamic Modulation configuration.
SLOT 5/0: Feb 25 18:35:51.606: %UBR10000-5-USFREQCHG: Interface Cable5/0/0 U0, changed
to Freq 26.230 MHz Feb 25 18:35:51.606: %Advanced Spectrum Management does not support
three Modulation Profile configurations. Modulation Profile 221 has been removed from
the Dynamic Modulation configuration.
Conditions: This issue occurs when the upstream is configured for three-step dynamic modulation
functionality and than upstream port is added to the spectrum group.
•
CSCsy10023
Symptoms: The cable metering commands are configured via SNMP as well using
CISCO-CABLE-METERING-MIB objects. Because changes made via SNMP are not synchronized
between the primary and secondary RPs, the cable metering-related configurations done via SNMP
are not seen in the secondary PRE and configurations are lost after PRE switchover.
Conditions: This issue is seen with a high availability CMTS and images having
CISCO-CABLE-METERING-MIB support.
Workaround: There is no workaround.
•
CSCsy13775
Symptoms: A wrong description on a facility alarm shows up for some upstream ports after resetting
a modular-host line card. The wrong description means that “Physical Port Administrative State
Down” shows up for some upstream ports even when those upstream ports are not administratively
shut down.
Similarly, a wrong description on a facility alarm shows up for some upstream ports after reloading
a Cisco uBR10012 router. The wrong description means that “Physical Port Link Down” shows up
for some upstream ports even when those upstream ports are up.
Conditions: This issue only occurs on line cards with upstream max-ports 6 configured.
Workaround: Execute the shut command followed by a no shut command on the upstream ports.
•
CSCsy16934
Symptoms: A wideband CM cannot go into the w-online state after resetting both the working line
card (guardian line card) and the protect line card and after the working line card reboots and
becomes active.
Conditions: This issue is seen while resetting the working line card which is the guardian line card
and when the working line card reboots first and becomes active.
Workaround: Remove and reconfigure the guardian configuration.
•
CSCsy20279
Symptoms: The PRE processor module crashes when the subinterface bundle is removed.
Conditions: This issue is seen when the CM has a lawful intercept configured and the CM is removed
before the subinterface bundle is removed.
Workaround: Remove the bundle before removing the CM. For example, remove the subinterface
bundle before shutting down the cable interface, or remove the subinterface bundle before executing
the clear cable modem command.
•
CSCsy21252
Symptoms: Some DOCSIS 3.0 cable modems are not able to get to the w-online state.
Conditions: This is seen in DOCSIS 3.0 cable modems that require the presence of TLV7 and/or
TLV8 in the primary channel MAC Domain Descriptor (MDD) in order to consider the MDD valid.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-126
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsy21357
Symptoms: The show cable modem remote-query command on the CMTS reports a modem
downstream power level as a positive value while the SNMP query shows a negative value for the
downstream power level between (–1 and 0).
Conditions: This issue is seen when “remote query” is enabled and the show cable modem
remote-query command is issued. It only shows if the modem downstream power level is between
0 and –1.0 dBmV.
Workaround: There is no workaround.
•
CSCsy22189
Symptoms: The DOCSIS Timing, Communication and Control (DTCC) card reference source
changes with execution of redundancy force-failover main-cpu command.
Conditions: This issue occurs during a PRE switchover on a Cisco uBR10012 router and the DTCC
clock reference changes resulting in the following messages being shown:
%UBR10KTCC-4-CHG_CLK_REF: Clock reference source set to DTI for DTCC card 2/1 by
process Plugin Start
*Mar 3 08:26:03.172 CST: %UBR10KTCC-1-DTISLOT: DTCC slot 2/1: card role changed to
Active
*Mar 3 08:26:03.172 CST: %UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 2/1 port 1 DTI client
status changed to Active normal
*Mar 3 08:26:03.172 CST: %UBR10KTCC-1-DTIPORTSERVER: DTCC slot 2/1 port 1 DTI server
status changed to freerun, external clock source: none
*Mar 3 08:26:03.620 CST: %UBR10KTCC-4-CHG_CLK_REF: Clock reference source set to DTI
for DTCC card 1/1 by process Plugin Start
*Mar 3 08:26:04.172 CST: %UBR10KTCC-1-DTISLOT: DTCC slot 1/1: card role changed to
Standby
*Mar 3 08:26:05.172 CST: %UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 1/1 port 1 DTI client
status changed to Active normal
*Mar 3 08:26:05.172 CST: %UBR10KTCC-1-DTIPORTSERVER: DTCC slot 1/1 port 1 DTI server
status changed to normal, external clock source: none
Workaround: There is no workaround.
•
CSCsy22466
Symptoms: Cable metering commands can be configured via SNMP as well using
CISCO-CABLE-METERING-MIB objects. Because changes made via SNMP is not synced
between the primary and secondary RPs, cable metering-related configurations done via SNMP are
not seen in the secondary PRE and configurations are lost after a PRE switchover.
Conditions: This issue is seen with a high availability CMTS and images having
CISCO-CABLE-METERING-MIB support.
•
CSCsy25895
Symptoms: The wideband CM cannot be in the w-online state. It can only be online.
Conditions: This issue occurs when high availability synchronization is not completed.
Workaround: Reconfigure the fiber node.
•
CSCsy26050
Symptom: A traceback is seen during line card static synchronization.
Conditions: The traceback is seen occasionally when the length of data to be sent is near to the
Maximum Transmission Unit (MTU).
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-127
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsy27568
Symptoms: The RCC receive-module first-center-frequency encoding in the registration response
message is not correct when using a rcc-template with multiple receive-modules. The CM rejects
this INVALID-RCC error message in the registration ACK.
Conditions: This issue is seen in a DOCSIS 3.0 compliant CM using RCC-template which is
configured with multiple receive-modules and distinct first-center-frequencies.
Workaround: Modify the RCC-template to use a single receive-module, but this may restrict the
CM's capabilities.
•
CSCsy28782
Symptoms: Load-balancing of default routes originated by Open Shortest Path First (OSPF) from
upper layer switches is not working.
Conditions: This issue is seen in a CMTS running Cisco IOS Release 12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsy29498
Symptoms: For the Cisco uBR-10-MC5X20 NB CM with the primary channel on remote a Cisco
Wideband SPA downstream interface, its toaster BPI index is reset to 0 after a line card switchover;
thus the downstream traffic is not encrypted.
Conditions: The condition is unknown.
Workaround: There is no workaround.
•
CSCsy30678
Symptoms: The device classification of certain types of CPEs impacts the cable filter groups applied
to the CPE.
Conditions: This is seen in Cisco routers such as the Cisco 831 and Cisco 1841 used as CPEs behind
CMs and are classified as “MTA” and not as “CPE”. As a result, an unexpected cable filter group,
or, in cases where defaults are not configured for “MTA”, no filter group is applied to the device. A
serious security gap is thus possible as all traffic from behind the device bypasses the established
security policies.
•
CSCsy30897
Symptoms: Logging on to the console is disabled on the cable line cards.
Conditions: This issue is seen if any debugging is done. The logging must be explicitly enabled
using the “logging console”. Previously, the logging was enabled by default on cable line cards.
•
CSCsy31477
Symptoms: A preamble length of 49 symbols causes an issue with a Broadband BCM3300 chip with
H cards. Imposing the minimum 50 symbols preamble length as to IM and SM bursts still reports
the same issue.
Conditions:
Workaround: Do a shut command followed by a no shut command on the interface or execute cable
upstream shutdown or a no cable upstream shutdown.
•
CSCsy33698
Symptoms: The Downstream Service Group (DS-SG) is missed after resetting the protect line card
and working line card.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-128
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This issue is seen while configuring Channel Grouping Domain (CGD) under c5/0/1
using the downstream modular-Cable 1/0/0 rf-channel 2 command and adding a modular
interface to the fiber node.
Router#cable power off 5/1
Router#cable power on 5/1
sleep about 5 seconds
Router#cable power off 5/0
Router#cable power on 5/0
Workaround: Perform a line card switchover once more.
•
CSCsy37770
Symptoms: The show cable rf-status command is supposed to display the RF channels whose
logical state shows “up”, but sometime when the command is issued for individual channels
separately, it displays RF channels that are not logically “up”.
Conditions: This is seen while executing the show cable rf-status command.
Workaround: Use the show cable rf-status command on all the interfaces instead of trying to check
each individual rf-channel separately.
•
CSCsy40915
Symptoms: The SNMP service primary flow counters include the pre-registration statistics while the
corresponding commands do not include it. The ARP packets from CMTS are not mapped to the
MAC destination address-based MAC classifiers on the Cisco uBR10012 platform.
Conditions: This happens for the upstream port on the Cisco uBR10012 router.
Workaround: There is no workaround.
•
CSCsy41788
Symptom: When the CMTS receives IGMPv3 SSM Leave, the multicast session may time out
prematurely.
Conditions: This issue is seen when IGMPv3 Leave is received by the CMTS.
•
CSCsy44819
Symptoms: Bonding-capable CMs may take a long time to get to the w-online state, or possibly fail
to get to the w-online state.
Conditions: This issue is seen when the CMTS is configured to forward for a bonding-capable CM
to a bonding-capable primary downstream channel, the CMTS randomly selects the target from the
set of DS channels defined in the MAC Domain Downstream Service Group (MD-DS-SG). When
complex fiber nodes are configured, it is possible that one or more of those channels are primary in
a different DOCSIS MAC domain. In the event the upstream channels for that MAC domain are not
available at the current fiber node, then the CM fails to initialize at the target frequency. Due to the
random nature of the target DS selection, multiple failures are possible.
Workaround: There is no workaround.
•
CSCsy45928
Symptoms: Multicast Downstream Service Identifier (DSID)s are not synced over.
Conditions: This issue occurs when there is no hardware or the hardware is not up in the line card
slot, before a line card that hosts modular channels with multicast traffic.
Workaround: There is no workaround.
•
CSCsy49035
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-129
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: In a PRE processor module switchover, the standby is reset repeatedly by the active
because of a mismatch in the command list.
Conditions: This is seen while configuring IPDR sessions, and the metering session, and then
removing the IPDR session.
Workaround: Configure the IPDR corresponding session as in the below example and follow the
procedure to unconfigure the cable metering session with IPDR if it is already configured.
– If the IPDR cable metering session with IPDR is configured. For example, you already
configured the cable metering session with IPDR 100 as follows:
Router(config)# cable metering ipdr 2 session 100
– Check if the cable metering session with IPDR is configured
Router# show running-config | include cable metering ipdr
Router# cable metering ipdr 2 session 0
– Unconfigure the cable metering session with IPDR.
Router(config)# no cable metering ipdr 2 session 100
•
CSCsy50150
Symptoms: The CMTS exhausts more than 50 percent of the CPU utilization with “getmany
docsIf3MdUsToDsChMappingTable”.
bash-3.00$ for ((i=0; i<100; i++)) do ` getmany -v2c 20.4.0.48 public
docsIf3MdUsToDsChMappingTable>/dev/null`; done;
nm-ubr10k-3#sh process cpu | i SNMP ENGINE
CPU utilization for five seconds: 0%/0%; one minute: 0%; five minutes: 2%
PID Runtime(ms)
Invoked
uSecs
5Sec
1Min
5Min TTY Process
346
84140
57115
1473 67.11% 45.98% 14.07%
0 SNMP ENGINE
========> High
Conditions: This is seen when an SNMP get operation is performed.
•
CSCsy52759
Symptoms: A traceback is seen when the show pxf cpu queue hqf pblt detail command is executed.
Conditions: This is seen when pblt_id is invalid and the according pblt is not used.
Workaround: Use the correct pblt_id.
•
CSCsy52912
Symptoms: The modem gets stuck in the init (io) state when both working and protect line cards are
reset at almost the same time.
Conditions: This issue is seen when both the working and protect line cards are reset.
Workaround: Reset the working card using the hw-module subslot x/y command or do a switchover.
•
CSCsy53661
Symptom: The CMTS can crash.
Conditions: The issue is seen when ETDB show commands are paused and multicast sessions are
removed because of a CPE leave or a CM goes offline.
Workaround: The term length can be set to 0 for no pausing during command display.
•
CSCsy56640
Symptoms: During ISSU commit version for the Cisco uBR10012 router, these errors are seen:
00:27:58: %COMP_MATRIX-3-PRST_VBL_DELETE: ISSU Compatibility Matrix was unable to
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-130
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
delete a persistent variable from the peer system (rc = -2).[OK]
00:30:19: %COMP_MATRIX-3-PRST_VBL_WRITE: ISSU Compatibility Matrix was unable to
write to persistent variables on the peer system (rc = 0).
Conditions: This issue is seen during ISSU commit version for the Cisco uBR10012 router, and
while upgrading from Cisco IOS Release 12.2(33)SCB2 to Cisco IOS Release 12.2(33)SCB3 or
later.
Workaround: There is no workaround.
•
CSCsy57992
Symptoms: A configuration mismatch is seen between card slot and card type while configuring a
card type. The configuration failed and an error message is displayed.
Conditions: This is seen on the Cisco uBR10012 router.
Workaround: Configure the correct card type for the card slot.
•
CSCsy62148
Symptoms: CM fails to get online.
Conditions: This issue is seen when a CM begins initial-ranging on an upstream port, and reports a
DOCID for a different MAC domain.
The CMTS issues a downstream frequency override (DFO) to the downstream frequency of the
hosting interface (for example, Cisco uBR10-MC5X20 line card) of the upstream port being used.
In this event, the target downstream port is in an “rf-shutdown' state”, and the DFO fails.
Workaround: There is no workaround.
•
CSCsy62405
Symptoms: The following syslog is generated at a very high rate:
%UBR10000-6-MAP_UPSTREAM_BW_ALLOCATION:
This can cause high CPU utilization due to an interrupt on a Cisco uBR10012 router.
Conditions: The condition is unknown.
Workaround: Disable console logging or raise the minimum level sent to the console.
•
CSCsy65904
Symptoms: The upstream connector configuration is different when the show run command is
executed on the active PRE and standby PRE processor modules.
Conditions: This issue is seen in a line card switchover.
Workaround: Perform a line card revertback and a line card switchover again.
•
CSCsy69525
Symptoms: The SA Descriptor Length field size is changed by 2 bytes.
Conditions: This update is required by EuroDOCSIS standard (ECR).
•
CSCsy69807
Symptoms: When sending Dynamic Bonding Change (DBC) to a CM, while adding or deleting a
host on the MAC domain, the CMTS always sends with a GMAC authentication which is not
required for Main Distribution Frame (MDF) 2 CM. The “Re-seq” flag is set to 0, which causes
multicast forwarding to stop at the CM.
•
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.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-131
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This is seen in the cable metering command.
Workaround: Reconfigure the metering options “flow-aggregate” and “cpe-list-suppress” in the
command.
•
CSCsy76287
Symptoms: After the Cisco uBR10012 router is upgraded from Cisco IOS Release 12.3(13a)BC1 to
Cisco IOS Release 12.3.(23)BC2, the advanced spectrum management feature does not work.
Conditions: The SNR value goes below the first threshold and enters the second modulation as
required. The issue occurs if a change is made to the first modulation, using the second threshold as
reference. For example:
Router# cable upstream 0 threshold snr-profiles 22 5
Mar 5 17:13:48 M 16-QAM QPSK SNR 21<22 CNR 21<22 CFEC 11>=10
<<CORRECT
Mar 5 17:14:10 M QPSK
16-QAM SNR 24>=8 CFEC 0<=10 UnCFEC 0<=1 << WRONG, it
should be SNR >=25
\
Workaround: Disable the second threshold value cable upstream 0 threshold snr-profiles 22 0
command.
•
CSCsy79521
Symptoms: The calculated upstream port utilization percentage on ports 1 to 3 is below the actual
usage.
Conditions: This is seen when more than one upstream port is active for a given MAC domain. The
upstream utilization for the higher port numbers can be too low.
Workaround: There is no workaround.
•
CSCsy81766
Symptoms: Enhanced Interior Gateway Routing Protocol (EIGRP) reports a bad checksum.
Conditions: This is seen when EIGRP adjacency is configured over a Generic Routing
Encapsulation (GRE) tunnel.
Workaround: Disable PXF on the Cisco uBR10012 router.
•
CSCsy82161
Symptoms: When a show diagnostic command is executed, the card uptimes are reported as a factor
of weeks, while others commands display the card uptimes as a factor of days such as “Card uptime
12 days, 7 hours, 26 minutes, 12 seconds” instead of “Card uptime 1 weeks, 5 days, 7 hours, 25
minutes, 45 seconds”.
Conditions: This is seen on a Cisco uBR10012 router running Cisco IOS Release12.2(33)SCB2.
•
CSCsy82805
Symptoms: Manually setting the MTU to “mtu 1500” on interface modular-cable is not reflected in
the show interface command.
Conditions: This issue is seen on a Cisco uBR10012 router running Cisco IOS Release
12.2(33)SBC.
Workaround: First manually set the MTU to “mtu 1464” and then manually set it to “mtu 1500”.
•
CSCsy83952
Symptoms: Traceback occurs when the show pxf cpu statistics ip-session command is executed.
Conditions: This traceback is always shown whenever these commands are executed.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-132
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsy86336
Symptoms: A Cisco uBR10012 router running on Cisco IOS Release 12.2(33)SCB1 crashes with
following error:
“PXF DMA Toaster Stall Error”.
Conditions: The crash happens during normal operation and is caused by a corrupted packet.
Workaround: There is no workaround.
•
CSCsy86349
Symptoms: SNMP query docsIf3MdChCfgTable is much slower than “ifStackTable”.
Conditions: This is an issue in the SNMP walk of docsIf3MdChCfgTable.
Workaround: There is no workaround.
•
CSCsy86466
Symptoms: Some wideband interface association with bundle-related errors may occur if line card
switchover and revertback is done once on active the PRE-A and the same action is performed on
PRE-B after a PRE switchover to PRE-B.
Conditions: This issue occurs on line card switchover.
Workaround: There is no workaround.
•
CSCsv87997
Symptoms: The DHCPv6 relay process crashes on the active RP.
Conditions: The condition is unknown.
Workaround: There is no workaround.
•
CSCsy88237
Symptoms: The critical facility alarms are incorrectly reported for wideband SPA SFPs.
Conditions: This issue is seen on a Cisco uBR10012 router running Cisco IOS Release
12.2(33)SCB.
Workaround: There is no workaround.
•
CSCsy89277
Symptoms: The standby PRE module reloads if cable metering is unconfigured while metering is in
progress.
Conditions: This is seen if cable metering is unconfigured.
Workaround: Ensure metering is completed and not in progress using the show cable metering
status verbose command before unconfiguring the cable metering command.
•
CSCsy91710
Symptoms: When SF-based assignment is used to assign SF forwarding to a non-primary MC
interface for the wideband CM, the downstream traffic fails.
Conditions: This is seen when attribute-based forwarding on a wideband CM attempts to assign
forwarding to MC interfaces that are not the CM primary downstream interface.
Workaround: If forwarding is required to be non-bonded forward on the CM primary downstream
interface, use the default bonded forwarding.
•
CSCsy93250
Symptoms: All the 65535 Blaze indices are used up.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-133
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This happens when the guardian is remote and there are multiple service flows per CM.
Workaround: Use a local guardian.
•
CSCsy94995
Symptoms: The ISR processes and higher priority tasks on the line card are busy so that IPC
keepalive messages cannot get disposed in time, which could lead to the IPC connection going down
and a line card crash.
Conditions: This issue is seen in a large environment, for example, over 3000 modems in one line
card. During startup, the line card may crash due to an IPC timeout.
Workaround: There is no workaround.
•
CSCsy96620
Symptoms: Resetting an IPv6-capable CM on a CMTS with the cable interface configured for “cable
ip-init ipv6” when it previously came online on IPv4 results in both IPv4 and IPv6 addresses and
setting the DIP to “Y”.
Conditions: This is seen in Cisco IOS Release 12.2(33)SCB.
Workaround: This issue does not cause any operational impact at all. As a best practice, when
changing IPv4 to IPv6 only, use the clear cable modem xxxxx delete command rather than a reset.
A delete will clear this issue.
•
CSCsy98999
Symptoms: Excessive numbers of DOCSIS DSx message failures are seen, including
DSA_ABORT_NO_ACK, DSC_ABORT_NO_ACK.
Conditions: This is seen in an environment that includes a significant amount of call signalling. The
problem is exacerbated by a significant amount of IOS process activity by SNMP.
Workaround: Decrease the SNMP activity by applying SNMP blocks on the RP.
•
CSCsz00449
Symptom: An enhancement in the ISSU packets size correctly for large messages and avoid a
memory leak.
Conditions: This is an enhancement in the ISSU packet size.
Workaround: There is no workaround.
•
CSCsz00879
Symptoms: Downstream service group information disappears.
Conditions: This issue is seen while powering off the working line card, and when the shutdown
command followed by a no shutdown command is executed on the interface in a protect line card.
Workaround: Do not execute a shutdown command followed by a no shutdown command on a
protect interface when the working line card is powered off.
•
CSCsz01856
Symptoms: The IF-MIB ifSpeed for the local downstreams show 42.8 Mbps throughput on CMTS
running Cisco IOS Release 12.2(33)SCB2. This should be brought down to 37.5 Mbps to better
account for the overhead presented by FEC+Trellis+MPEG2 overhead.
Conditions: This is seen in Cisco IOS Release 12.2(33)SCB2.
•
CSCsz02830
Symptoms: Online insertion and removal (OIR) compatibility fails when it tries to reconfigure the
MAC domain with SPA channels 16-23 on the new card.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-134
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This is seen on OIR replacement of the Cisco MC5X20 cards. The cleanup of SPA
channels 16-23 does not happen properly.
Workaround: There is no workaround.
•
CSCsz02938
Symptom: The following message is observed after a PRE processor module switchover:
00:02:51: %UBR10KTCC-1-DTIERR: DTI interface Error code -7 function
dti_set_active_card
Conditions: This issue is seen when there are two TCC cards.
Workaround: There is no workaround.
•
CSCsz04587
Symptoms: Removing all 802.1Q VLANs on an EtherChannel crashes PXF on the PRE4 processor
module, if the keepalive is enabled on any Gigabit Ethernet interface, causing a “PXF DMA FTC
Unknown Command Error”. This only happens for SPAs on Cisco 10000 Series SPA Interface
Processor-600 (Cisco SIP-600).
After system reload, the show pxf cpu ech port-channel xx.yy commands fails to display the hash
table of VLANs on both the PRE2 and the PRE4.
Conditions: This is seen when the EtherChannel “cicb_data.ech_bundle_index” on External Column
Memory (XCM) column 5 is set to zero when the native VLAN, vlan1, is destroyed. As the result,
a keepalive packet is incorrectly sent via the VCCI of the port-channel, instead of the Gigabit
Ethernet interface.
The second symptom is due to the failure to update 802.1Q the vlan’s “cicb_data.ech_bundle_index”
on XCM column 5 when an interface is added to an EtherChannel.
Workaround: Restore the traffic in four steps:
1.
Copy the configuration of the port-channel and the VLAN.
2.
Delete the port-channel.
3.
Edit the configuration to configure Gigabit Ethernet interfaces in a port-channel, before
configuring VLAN subinterfaces.
4.
Paste the edited configuration.
In theory, you may boot the CMTS with no EtherChannel configured, and copy an edited production
configuration file to running-config after all the interfaces are up.
•
CSCsz05250
Symptoms: 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.
•
CSCsz12821
Symptoms: IGMPv3 join is ignored by CMTS.
Conditions: This issue is seen when IGMPv3 is configured on the bundle interface. SSM-mapping
is configured on the CMTS. The ignored IGMPv3 join is *,G join with a group address in the SSM
range.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-135
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Use S,G IGMPv3 join or use *,G IGMPv2 join.
•
CSCsz13732
Symptoms: The Channel Grouping Domain (CGD) information is not displayed in the show run
command or the show cable mac-domain cgd-associations command when no connector is
configured.
Conditions: This issue is seen when no connector is configured for the upstream port.
Workaround: Configure the connector for the upstream port.
•
CSCsz17386
Symptom: Modem registration is not disabled when a guardian card is missing.
Conditions: This is seen in the configuration of the online CM remote downstream interface.
Workaround: Configure the guardian line card using the modular-host command or configure the
CM online on a local Cisco uBR10-MC5X20 downstream line card.
•
CSCsz20091
Symptoms: Modems using SPA modular-cable downstreams on the Cisco uBR10012 router cannot
go past the init (io) state.
Conditions: This is seen when multicast encryption is enabled. This issue occurs when a key index
request for an encrypted multicast session from the MAC domain host line card to the wideband host
line card fails. Such a failure can occur due to an inter-line card IPC drop.
Workaround: The following steps can be used to recover from this error state:
•
1.
Remove cable match address from any bundle interface which has associated with the SPA.
2.
Reset the SPA.
3.
Re-enable cable match address on those bundle interfaces.
CSCsz20633
Symptoms: When the wideband resiliency is not configured, output for the show cable modem
summary wb-rfs command is null or not correct.
Conditions: This is seen if the CMTS never configures wideband resiliency and if wideband
resiliency configuration is removed from the CMTS, then the output is incorrect.
Workaround: There is no workaround.
•
CSCsz20671
Symptoms: During PRE module switchover, each of the line cards unnecessarily updates the toaster
information.
Conditions: This issue is seen during a PRE switchover triggering the update.
Workaround: There is no workaround.
•
CSCsz21661
Symptoms: The Gigabit Ethernet output for a 24 downstream wideband and narrowband SPA can
getisolated 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
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-136
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
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.
•
CSCsx24746
Symptoms: Per MAC domain statistics are not available.
Conditions: This issue is seen when debugging for forwarding statistics per MAC domain using
multiple commands.
•
CSCsz27235
Symptoms: The failure of a DOCSIS SPA with modular cable (MC) interfaces occurs when there is
multicast traffic.
Conditions: This happens when multicast traffic is forwarding to a MC interface with multicast QoS
configured and a hw module shutdown on SPA causes the RP to crash.
Workaround: There is no workaround.
•
CSCsz31819
Symptoms: The standby PRE processor module keeps on reloading with a bulk-sync failure when
the Cisco Full Height Gigabit Ethernet (FHGE) card is configured in the slot.
Conditions: This issue in the preconfiguration of the FHGE in the slot.
Workaround: Do not use FHGE in slot 2.
•
CSCsz33086
Symptoms: A channel enters the disabled state in a load balancing (LB) state machine.
Conditions: This issue occurs if there is a channel whose condition is very bad, and is configured to
a LB group with other channels. The state is set to disabled if it has too many LB failures on it. If
this bad condition persists for a long time, and then it reverts, the LB state of this channel may get
disabled.
Workaround: Manually execute the clear cable load-balance state command.
•
CSCsz34527
Symptoms: After a cable line card switchover, the multicast traffic is forwarded by the CMTS but
the traffic does not reach the customer premises equipment (CPE) behind the cable modem.
Conditions: This issue is seen when a multicast QoS group is configured with encryption and there
is a session using that QoS. This issue is seen after line card switchover for that multicast session.
Workaround: Send an IGMP Leave from the CPE and then let the CPE join the session again.
•
CSCsz34582
Symptoms: The Cisco SIP-600 removal of a wideband SPA from bay 2 affects traffic on the
wideband SPA in bay 0. The affected service flow queues never dequeue packets resulting in a full
queue and taildrops.
Conditions: This is seen in the Cisco SIP-600 in slot 1 or 3 and wideband SPAs in bays 0 and 2 of
the SIP.
Workaround: Perform online insertion and removal (OIR) or power cycle the affected SPA or SIP.
•
CSCsz40945
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-137
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: The Cisco uBR10012 router may suffer a PXF crash with the following message in the
PXF crash information file:
PXF DMA Error - End of Descriptor Before Cmd Byte Length Exhausted
Conditions: The crash is observed on the Cisco uBR10012 router with PRE2 processor module
running Cisco IOS Release 12.2(33)SCB2.
Workaround: There is no workaround.
•
CSCsz42347
Symptoms: The SPA BPI key index for a multicast Security Association Identifier (SAID) shows as
zero after a PRE module or line card switchover. The index is displayed as Blaze_index in the show
interface cable <x/y/z> key sid command.
Conditions: This is seen after PRE module or line card switchover.
Workaround: Remove the cable match command in the bundle interface and reset all the line cards
that have multicast SAIDs with 0 SPA BPI index. If line card high availability is configured, keep
the protect line card down.
•
CSCsz48159
Symptom: The Cisco uBR10012 router with a PRE2 processor module configured for PacketCable
Multimedia (PCMM) may crash with the following message in the log:
Invalid SID (1004) position for interface Cable6/0/4: CM 0015.a4f8.2076:Is used by CM
<mac> SFID 17066 SID 120. SID container info: start 7933 end 7275
-Traceback= 608F7634 608F7D50 60221758 60221CC4 60222A48 6035198C 60302754 60303B98
603040C0 6034EACC 609F1870 609F185C
Conditions: The crash is observed on the Cisco uBR10012 router with a PRE2 processor module
running Cisco IOS Release 12.2(33)SCB2 and with PCMM configured.
Workaround: There is no workaround.
•
CSCsz48314
Symptoms: A memory leak is observed when unconfiguring the cable downstream dsg tg channel
command from the interface.
Conditions: This was seen when cable downstream dsg tg channel is unconfigured.
•
CSCsz53800
Symptoms: Multiple memory leaks are observed while issuing the show memory debug leak
command on the line card.
Conditions: The condition is unknown.
Workaround: There is no workaround.
•
CSCsz54557
Symptoms: PXF crashes after “microcode reload pxf”.
Conditions: This issue is seen when the following conditions are done simultaneously:
– One Cisco Wideband SPA card is present at the last bay of aCisco 10000 Series SPA Interface
Processor-600 (Cisco SIP-600) card. For example, the card is present in slot 3, “card 3/3
24rfchannel-spa-1”.
– There are NB modems primary on the MC interface of that card. Meanwhile, DBS is configured.
There is downstream traffic via these modems.
– Perform PXF reload.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-138
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: To prevent a crash from happening:
•
1.
Do not insert the Cisco Wideband SPA card into the last bay of the Cisco 10000 Series SPA
Interface Processor-600 (Cisco SIP-600) card located in slot 3.
2.
To safely reload microcode, stop the traffic. After reload, modify the configuration (for
example, bandwidth-percent) on the MC interface with DBS configured. Repeat the
modification on all MC interfaces on that card.
CSCsz61099
Symptoms: A crash is observed when running the show tech | redirect disk0:xxxx command.
Conditions: The following conditions may cause a crash:
– Connecting to the CMTS using Secure Shell (SSH).
– Executing the show tech | redirect disk command.
Workaround: The crash does not occur with a Telnet session. If you use SSH to connect into the
CMTS, do not redirect the output to DISK0 or DISK1.
•
CSCsz63000
Symptoms: The CMTS fails to send Subscriber Account Management Interface Specification
(SAMIS) data to the IPDR collector, though the TCP connection is still there. The show ipdr session
command reports there is unacknowledged data, and show process event of IPDR process reports
the process is in “sleep” state.
Conditions: IPDR and cable metering is enabled.
Workaround: Disable IPDR and re-enable.
•
CSCsz65557
Symptoms: A traceback is displayed with the “IPCTXERR” error message.
Conditions: This is seen when IPC fails due to various reasons and the “IPCTXERR” error message
is displayed with traceback.
Workaround: There is no workaround.
•
CSCsz67347
Symptoms: Excessive numbers of DOCSIS DSx message failures are displayed, including
DSA_ABORT_NO_ACK, DSC_ABORT_NO_ACK.
Conditions: This issue is seen in the call signaling environment and by a large amount of IOS
process activity by SNMP.
Workaround: Decrease the SNMP activity by applying SNMP blocks on the RP.
Open Caveats—Cisco IOS Release 12.2(33)SCB2
•
CSCek29193
Symptoms: Swapping unlike the Cisco uBR10-MC5X20S/U line cards ) causes modems to go
offline, and the configuration is lost.
Conditions: The default behavior of the cr10k card [slot/subslot]; oir-compatibility command must
be converted from default disabled to default enabled for all cable line cards.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-139
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Prior to exchanging line cards, configure OIR compatibility for all slots. If line card
exchange happens without configuring OIR compatability, and the problem is discovered before a
write memory is issued, perform the following workaround:
1.
Copy sec-nvram:startup-config
2.
Edit card types from Cisco uBR10-MC5X20S-D to Cisco uBR10-MC5X20U-D
3.
Copy the modified file to nvram:startup-config, and also sec-nvram:startup-config
4.
Reload the configuration.
This is the only procedure that can ensure that the frequency stacking and virtual interface
configurations are preserved. Attempts to paste pieces of the previously stored running
configuration will fail if frequency stacking or virtual interfaces are configured, because the
connectors must be unassigned first.
If a write memory has occurred, then the shutdown state and blank configuration for all interfaces
will be written to both primary and secondary NVRAM.This technique will not work without
resorting to an externally stored backup configuration for the system.
•
CSCsq45997
Symptoms: The throughput rate shows (slightly) more than the expected range.
Conditions: This happens when the the DMIC feature is enabled and the modem is marked with
given maximum rate values. This can also happen when the QoS profile has lower maximum rates.
Workaround: There are no workarounds.
•
CSCsq64227
Symptoms: The number of downstream PHS rules for a cable MAC domain stays the same even
though more downstreams can be added to the MAC domain (through modular downstreams).
Workaround: There are no workarounds.
•
CSCsr09423
Symptoms: When a UCD change occurs, some data structures related to the US scheduler of
secondary upstream service flows do not get properly updated (for example, minislot size). Because
of this, any traffic through these service flow might get affected (for example, packet drop).
Workaround: There are no workarounds.
•
CSCsu00342
Symptoms: Multicast stream drops after changing ip igmp query-interval
Conditions:
– Cisco 7600 chassis with Sup720 engine running 12.2(33)SRB release.
– 7600 is configured with IGMPV3 and running Source Specific Multicast (SSM).
– Multicast stream(s) restore itself within 40-60 seconds.
Workaround: There are no workarounds.
•
CSCsr59753
Symptoms: 12.3(23)BC2 mixed docsis mode (atdma-tdma) can only achieve 40 UGS for an
upstream. But, 12.3(17b)BC9 can achieve 48 UGS flows.
Conditions: Currently, it looks like this may have something to do with mixed mode and modems.
Workaround: There is no workaround.
•
CSCsu22450
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-140
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Symptoms: Inactive sessions are observed in the multicast explicit tracking database.
Conditions: IGMP leave received for a group followed by a cable line card switchover
Workaround: There are no workarounds.
•
CSCsw52539
Symptoms: Cable metering collection enters "write-error" state and does not recover.
Conditions: When cable metering is configured with default TCP parameters.
Workaround: Enabling "ip tcp path-mtu-discovery" may help prevent occurrences of the issue. Also,
the command test cable metering abort will clear the "hung" state and allows the next iteration of
cable metering to occur.
•
CSCsu33316
Symptoms: The cable line card crashes after the execution of the commands clear arp and clear
cable modem all delete.
Workaround: There are no workarounds.
•
CSCsu45950
Symptoms: Certain PCMM calls using wideband CMs may have one way audio.
Conditions: PCMM calls between w-online(pt) and online(pt) on wideband CMs.
Workaround: There are no workarounds.
•
CSCsu53695
Symptoms: When MVPN is configured on CMTS, and a CPE joins a multicast group that has a
source already transmitting to, then the (S,G) entry is not created in mvrf table of the CMTS.
Workaround: There are no workarounds.
•
CSCsv11435
Symptoms: When modem comes up during the off-peak time, when it is not supposed to be
monitored as per enforce-rule configured, the smp is not synced to standby line card.
Conditions: If a line card switchover is done during the off-peak time, even if the modem enters
peak-time, it is not monitored as per the enforced rule configured. The smp is synced to standby line
card only once the modem is monitored during peak-time.
•
CSCsv12582
Symptoms: In numerous 10Ks running 12.3(21a)BC7 and BC8, the customer is seeing instances
where the CPE device disappears from the cable host table and sometimes from the ARP table. In
all cases, the CPE loses IP connectivity. This shows up across different CM vendors, different CLC
types, different plants, and different 10Ks.
Conditions:
– CPE loses connectivity.
– The CPE is not showing up on the CMTS using any “show” commands like show cable modem
or show cable modem
– Sometimes, the ARP entry for the CPE is seen in the ARP table.
– When the CPE sends a DHCPDISCOVER packet, the CNR responds with DHCPOFFER. But
for some reason, the CPE keeps sending DHCPDISCOVER.
Workaround: Try clear cable host until the device appears back in the host table. This may not work
always.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-141
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsv14196
Symptoms: Secondary PRE crashes when DBS function is applied to wideband interface.
Conditions: Problem is seen on a PRE-2 running 12.3(23)BC2. To apply DBS, the customer has to
shut down the wideband interface first and then they met a IOS crash when
"chunk_free(docsis_srv_flow_chunk,flowp)" at the last step of cmts_destroy_ds_service_flow on
secondary PRE. No PXF happens.
Workaround: There is no workaround.
•
CSCsv36208
Symptoms: In a very rare scenario, after an N+1 switchover, upstream traffic that is BPI encrypted
is not received properly by the CMTS. Instead, input errors are logged on the interface and "debug
cable error" gives error messages similar to:
Cable5/1/4: Bad rx packet. JIB status code 0xA
Conditions: The issue occurs on upstream channels that use a “shared” connector where the other
upstream channel using the same shared connector is on another downstream and is shutdown.
Workaround: Activate the downstream and other upstream channel using the same shared connector
or unshare the upstream connector temporarily.
•
CSCsv53276
Symptoms: The show controller modular-cable 1/0/0: command shows that rf-channel 0 become
unknown after hw-module reset.
SPA IP address = 192.168.5.1
SPA MAC Addr = 0012.001A.67D7 QAM
MOD ANNEX
TKB Interval Rate adjust State 0
Unknown Unknown 0
1
Enabled
====> unknown 1
QAM 256 Annex B 2423
132
Enabled 2
QAM
256 Annex B 2423
132
Enabled 3
QAM 256 Annex B 2423
132
Enabled
Conditions: Happened after hw-module reset and show diag 1/0/0. This will cause all wideband
modems also go to NB.
Workaround: Reload the router to correct the issue.
•
CSCsv54656
Symptoms: On a UBR10k the input rate counter of all GRE tunnels is incorrect. It is doubled
compared to the real value. Only tunnels interfaces are affected.
Conditions: This occurs on a UBR10k/ESR-PRE2 running IOS versions 12.3(23)BC1 and
12.3(23)BC2 and 12.3(23)BC5.
Workaround: There is no workaround.
•
CSCsv59917
Symptoms: From logs collected from the customer's network, at least three routers show the
symptom of the problem. For the two SPAs installed in the Cisco Wideband SIP jacket card,
SPA1/0/1 lost all its configurations, including its IP and MAC addresses, and all its RF channel
configurations. SPA1/0/0 lost some of its configurations. IP and MAC addresses remain but some of
the RF channel configurations are missing. Recovery measures were attempted, including PRE S/O,
hw-module reset, unprovision/reprovision the SPAs, but none succeeded. Reloading the router
seems to be the only way to recover.
Workaround: Reloading the router is the only way to recover.
•
CSCsv63763
Symptoms: PRE HA test shows that sometimes the voice call dropout time is larger than one second.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-142
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: Test the offnet call.
Workaround: There are no workarounds.
•
CSCsv88650
Symptoms: Modems on modular interface suffer long-time recovery time or even fall offline after
switchover or revertback.
Conditions: Only affect 520S/520U card as active card. Only affect modems on modular interface.
More visible for annex A modulation type.
Workaround: There is no workaround.
•
CSCsw14622
Symptoms: 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 are no workarounds.
•
CSCsw25895
Symptoms: Memory leak at CMTS_HCCP_GET_TLV_PARSE_TLV has been observed at the RP.
Workaround: There is no workaround.
•
CSCsw24639
Symptoms: In case of multicast and the forwarding is through WB interface, multicast SFs are
created and the counters are maintained under the WB interfaces.
Workaround: There are no workarounds.
•
CSCsw26022
Symptoms: Memory leak at buffer_peak_notify is observed.
Workaround: There are no workarounds.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-143
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsw29191
Symptoms: When TWC, the serviceflow in admitted state still has traffic going through.
Conditions: In three-way calling, and one side is on hold.
Workaround: There is no workaround.
•
CSCsw35917
Symptoms: SP messages are logged in RP console but not sent as traps by RP's SNMP agent.
Workaround: There are no workarounds.
•
CSCsw33866
Symptoms: Both the working cards 5/0 and protect card 5/1 are active.
Conditions: Do a LC SO from 5/0 to 5/1. After the synced, shut down 5/0/2 interface. Do a LC
revertback from 5/1 to 5/0. Do no shut 5/0/2 (Do not wait in between step3 and step 4). Now you
will find, after suspend timer expires, both 5/0 and 5/1 are active.
Workaround: Do not shut down an active protect interface. If both the cards (working and protect)
are active, reset protect card.
•
CSCsw38849
Symptoms: Backup DTCC card may experience an unexpected reload irregularly with following
messages:
Oct 14 23:01:25.487: %IPCOIR-3-TIMEOUT: KA Timeout: slot1/1, LRCV:00:00:07
LKA:00:00:07 LRMV:never, NKA:00:00:00, cpu 1%/1% 2%
Oct 14 23:01:25.491: %IPCOIR-3-TIMEOUT: KA Timeout: slot1/1, LRCV:never LKA:never
LRMV:never, NKA:00:00:00, cpu 1%/1% 2%
Oct 14 23:01:25.491: %IPCOIR-2-CARD_UP_DOWN: Card in slot 1/1 is down. Notifying
2cable-dtcc driver.
Oct 14 23:01:25.491: %UBR10K_ALARM-6-INFO: ASSERT CRITICAL slot 1/1/0 Active Card
Removed OIR Alarm - subslot 1
Oct 14 23:01:26.555: %IPCOIR-5-CARD_DETECTED: Card type 2cable-dtcc (0x5B0) in slot 1/1
Oct 14 23:01:26.555: %IPCOIR-5-CARD_LOADING: Loading card in slot 1/1
Oct 14 23:01:27.767: %C10K-5-LC_NOTICE: Slot[1/1] Line-card Image Downloaded...Booting...
Oct 14 23:01:45.580: %IPCOIR-5-CARD_DETECTED: Card type 2cable-dtcc (0x5B0) in slot 1/1
Oct 14 23:01:45.656: %UBR10KTCC-4-CHG_CLK_REF: Clock reference source set to DTI for
DTCC card 1/1
Oct 14 23:01:45.936: %UBR10K_ALARM-6-INFO: CLEAR CRITICAL slot 1/1/0 Active Card
Removed OIR Alarm - subslot 1
Oct 14 23:01:45.936: %IPCOIR-2-CARD_UP_DOWN: Card in slot 1/1 is up. Notifying 2cable-dtcc
driver.
Oct 14 23:01:47.040: %UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 1/1 port 1 DTI client status
changed to Active fast
Oct 14 23:02:20.042: %UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 1/1 port 1 DTI client status
changed to Active normal
Conditions: This problem is seen on only Backup DTCC irregularly of UBR10K running
12.3(23)BC2.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-144
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsw49188
Symptoms: Cable metering fails and enters a hung state.
Conditions: This problem happens when the ip tcp timestamp option is configured globally.
Workaround: Do not use the ip tcp timestamp option.
•
CSCsw76178
Symptoms: During LCHA, the CM instance bpi_enable flag (cminstp->priv_en) on RP is not synced
over correctly. This is observed for MC interface CM.
Conditions: Generate multicast stream to CMs, bpi CM during LC switchover.
Workaround: There is no workaround.
•
CSCsw78972
Symptoms: MDD change message is generated on all the RF channels globally whenever any RF
channel is configured on the CMTS. MDD change is supposed to be generated for channels within
a MacDomain.
Workaround: There are no workarounds.
•
CSCsw79768
Symptoms: 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: UBR7114E running 12.3(21a)BC3.
Workaround: Poll the individual values following the steps of the procedure suggested in SR
610144513.
•
CSCsw89288
Symptoms: Show interface cable x/y/z SID will show null MAC address and null IP address SID
entries.
Conditions: IOS 12.3(17b)BC9, UBR10K CMTS
Workaround: There is no workaround.
•
CSCsw89385
Symptoms: When a UBR10k has a lots of CMes, the command show cable modem docsis version
summary total may not be able to display each column properly because there is not enough space
between columns.
Conditions: When there are lots of cable modems.
Workaround: There are no workarounds.
•
CSCsw97150
Symptoms: When upgrading IOS and hardware, the existing configuration could conflict with the
channel IDs on other interfaces.
Conditions: Customer would like to see the DS channel IDs hidden, but viewable with a show
command, in order to avoid potential conflicts.
Workaround: Reconfigure downstream channel-id for any interface that has a conflicting ID.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-145
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsx25792
Symptoms: When either Cisco5x20 card Mac domains have WB associations, a traceback may be
observed along with a message similar to the following when NO CARD x/x is used:
*Jan 25 05:41:57.235 PST: %SYS-3-BADLIST_DESTROY: Removed a non-empty list(2F3F7BF4,
name: (unknown)), having 36 elements -Process= "C10K Card Actions", ipl= 0, pid= 75
A small amount of memory leak may also happen. No other side effects are expected.
Conditions: This traceback is seen only if the card had a NB-WB associations previously, and was
powered down or removed.
Workaround: There are no workarounds.
•
CSCsx32213
Symptoms: A Cisco router may reload reporting a bus error.
Workaround: There is no workaround.
Resolved Caveats — Cisco IOS Release 12.2(33)SCB2
•
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 workaround.
•
CSCsv90106
Symptom: A router may write a crashinfo that lacks the normal command logs, crash traceback,
crash context, or memory dumps.
Conditions: This might be seen in a memory corruption crash depending on precisely how the
memory was corrupted.
Workaround: There is no workaround.
•
CSCsy21863
Symptom: An unexpected reload occurred in Cisco SIP-600 carrier cards in Cisco UBR10012
router.
Conditions: This issue occurs when it is used with DS-24 SPA for DOCSIS 3.0
Workaround: There is no workaround.
•
CSCsy28104
Symptom: A change was introduced in Cisco IOS Release 12.3(21)BC that forces specific cable
modems to be compliant to the DOCSIS specification. The requirement forces DOCSIS 1.1 modems
to use BPI+ for authentication purposes instead of BPI. A number of customers have 10000s of cable
modems that are not compliant as they do not contain CM certificates. Upgrading to this release is
causing them a lot of pain and they are not willing to upgrade their modems at this time as it is cost
prohibitive.
Conditions: The default behavior of the CMTS was changed in 12.3(21)BC with no way to disable
the new default behavior.
Workaround: A workaround is to provision these modems to sign on using DOCSIS 1.0
configuration files which will make them DOCSIS 1.0 modems and compliant when using only BPI.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-146
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsy42434
Symptom: The active PRE module crashes during bulk sync processing when the standby PRE
module boots up in a Cisco uBR10000 router.
Conditions: This crash occurs when there is an aggregate of more than 400 active multicast
replications on the SPA downstream interfaces (modular-cable or wideband-cable) during the PRE
module bulk sync process. However, if the standby PRE module boots up before the SPA interfaces
are up, the crash is not be seen since the session information is synced to standby PRE module using
incremental syncs instead of bulk sync.
The multicast replications may be created either through static multicast configuration (possibly for
DOCSIS Set-Top Gateway (DSG)) or for dynamic multicast sessions.
Workaround: Unconfigure the ip igmp static-group command and the ip multicast-routing
command.
•
CSCsy48072
Symptom: The SPA interface went down with following error message in the log:
“SPAWBCMTS,2,CARD_UP_DOWN,Card 24rfchannel-spa-1 in bay 1/0/0 is down.,
*C10K,3,LC_ERR,"Slot[1/0] 2jacket-1 WIDEBAND DOCSIS SPA[1/0] voltage outside of nominal
range. Nominal (1800mV), value(2017mV) The SPA has been,*”
Conditions: This issue is seen in a Cisco uBR10000 router using a SPA-24XDS-SFP with PRE2
module running Cisco IOS Release12.3(23)BC6.
Workaround: Use hw-module subslot 1/0 reset command to recover the interfaces.
•
CSCsy52462
Symptoms: The downstream traffic on a wideband interface intermittently stops being forwarded.
The queue lengths grows to max as shown in show pxf cpu queue wideband-Cable A/B/C:D
command with no further dequeues.
Conditions: This issue occurs if downstream bonding group might exist on the interface and more
number of channels are present in the bonded channel.
Workaround: There is no workaround, however try reloading microcode to clear the problem if it
occurs.
Open Caveats — Cisco IOS Release 12.2(33)SCB1
The open caveats are grouped based on their component types. The open caveats documented from prior
releases that are unresolved might also apply to this release.
CMTS-Application
•
CSCsw52539
Symptoms: Cable metering collection enters "write-error" state and does not recover.
Conditions: When cable metering is configured with default TCP parameters.
Workaround: Enabling "ip tcp path-mtu-discovery" may help prevent occurrences of the issue. Also,
the command test cable metering abort will clear the "hung" state and allows the next iteration of
cable metering to occur.
•
CSCsq45997
Symptoms: Throughput rate shows (slightly) more than the expected range.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-147
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This happens when DMIC feature is enabled and modem is marked with given Max rate
values. This can also happen when QoS profile has lower Max rates.
Workaround: There are no workarounds.
•
CSCsu45950
Symptoms: Certain PCMM calls using wideband CMs may have one way audio.
Conditions: PCMM calls between w-online(pt) and online(pt) on wideband CMs.
Workaround: There are no workarounds.
•
CSCsu00342
Symptoms: Multicast stream drops after changing ip igmp query-interval
Conditions:
– Cisco 7600 chassis with Sup720 engine running 12.2(33)SRB release.
– 7600 is configured with IGMPV3 and running Source Specific Multicast (SSM).
– Multicast stream(s) restore itself within 40-60 seconds.
Workaround: There are no workarounds.
•
CSCsu22450
Symptoms: Inactive sessions are observed in the multicast explicit tracking database.
Conditions: IGMP leave received for a group followed by a cable line card switchover
Workaround: There are no workarounds.
•
CSCsw35917
Symptoms: SP messages are logged in RP console but not sent as traps by RP's SNMP agent.
Workaround: There are no workarounds.
•
CSCsv11435
Symptoms: When modem comes up during the off-peak time, when it is not supposed to be
monitored as per enforce-rule configured, the smp is not synced to standby line card.
Conditions: If a line card switchover is done during the off-peak time, even if the modem enters
peak-time, it is not monitored as per the enforced rule configured. The smp is synced to standby line
card only once the modem is monitored during peak-time.
•
CSCsw49188
Symptoms: Cable metering fails and enters a hung state.
Conditions: This problem happens when the ip tcp timestamp option is configured globally.
Workaround: Do not use the ip tcp timestamp option.
•
CSCsx15034
Symptoms: Cable modems stuck in expired(pt) state, when both pre-equalization and BPI+ are
configured.
Conditions: Certain dynamic faults within the HFC network causing a requirement to adjust the
main tap of the modem's transmit equalizer.
Workaround: For MC520s and u cards, prior to 12.3(23)BC6, and CSCsu95526
Use following modulation profile for 64qam, 6.4 MHz channel-width at 2 ticks.
cab modulation-prof 224 request 0 16 0 48 qpsk scram 152 no-diff 32 fixed qpsk0 1 2048
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-148
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
cab modulation-prof 224 initial 5 34 0 48 16qam scram 152 no-diff 384 fixed qpsk1 1 2048
cab modulation-prof 224 station 5 34 0 48 16qam scram 152 no-diff 384 fixed qpsk1 1 2048
cab modulation-prof 224 a-short 6 76 3 22 64qam scram 152 no-diff 64 short qpsk1 1 2048
cab modulation-prof 224 a-long 9 232 0 22 64qam scram 152 no-diff 64 short qpsk1 1 2048
cab modulation-prof 224 a-ugs 9 232 0 22 64qam scram 152 no-diff 64 short qpsk1 1 2048
or if they want more robust VoIP;
cab modulation-prof 224 a-ugs 9 232 0 22 16qam scram 152 no-diff 64 short qpsk1 1 2048
For 16Qams:
cab modulation-prof 223 request 0 16 0 44 qpsk scram 152 no-diff 32 fixed qpsk0 1 2048
cab
CMTS-Database
•
CSCsw26022
Symptoms: Memory leak at buffer_peak_notify is observed.
Workaround: There are no workarounds.
•
CSCsw89385
Symptoms: When a UBR10k has a lots of CMes, the command show cable modem docsis version
summary total may not be able to display each column properly because there is not enough space
between columns.
Conditions: When there are lots of cable modems.
Workaround: There are no workarounds.
•
CSCsw14622
Symptoms: 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 are no workarounds.
CMTS-DOCSIS
•
CSCsw78391
Symptoms: Some DS packets of UGS traffic is dropped for seven seconds after CM sends another
DSC for the service flow.
Conditions: Cable service flow activity-timeout <#> is set to a value shorter than the call duration.
For instance, an Arris CM seems to ignore this value, while Scientific Atlanta CM starts resending
DSC messages every (period - 10) seconds.
Workaround: Increase cable service flow activity-timeout, or use a different CM model.
•
CSCsw78972
Symptoms: MDD change message is generated on all the RF channels globally whenever any RF
channel is configured on the CMTS. MDD change is supposed to be generated for channels within
a MacDomain.
Workaround: There are no workarounds.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-149
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsr09423
Symptoms: When UCD change occurs, some data structures related to US scheduler of secondary
upstream service flows do not get properly updated. For instance, minislot size. Because of this, any
traffic through these service flow might get affected. For instance, packet drop.
Workaround: There are no workarounds.
•
CSCsq64227
Symptoms: The number of downstream PHS rules for a cable MAC domain stays the same even
though more downstreams can be added to the MAC domain (through modular downstreams).
Workaround: There are no workarounds.
•
CSCsv36208
Symptoms: In a very rare scenario, after an N+1 switchover, upstream traffic that is BPI encrypted
is not received properly by the CMTS. Instead, input errors are logged on the interface and "debug
cable error" gives error messages similar to:
Cable5/1/4: Bad rx packet. JIB status code 0xA
Conditions: The issue occurs on upstream channels that use a "shared" connector where the other
upstream channel using the same shared connector is on another downstream and is shutdown.
Workaround: Activate the downstream and other upstream channel using the same shared connector
or unshare the upstream connector temporarily.
CMTS-Management
•
CSCsw79768
Symptoms: 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: UBR7114E running 12.3(21a)BC3.
Workaround: Poll the individual values following the steps of the procedure suggested in SR
610144513.
CMTS-Platform
•
CSCsu33316
Symptoms: The cable line card crashes after the execution of the commands clear arp and clear
cable modem all delete.
Workaround: There are no workarounds.
•
CSCsx25792
Symptoms: When either Cisco 5x20 card Mac domains have WB associations, a traceback may be
observed along with a message similar to the following when NO CARD x/x is used:
*Jan 25 05:41:57.235 PST: %SYS-3-BADLIST_DESTROY: Removed a non-empty list(2F3F7BF4,
name: (unknown)), having 36 elements -Process= "C10K Card Actions", ipl= 0, pid= 75
A small amount of memory leak may also happen. No other side effects are expected.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-150
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: This traceback is seen only if the card had a NB-WB associations previously, and was
powered down or removed.
Workaround: There are no workarounds.
•
CSCsu96374
Symptoms: Remote modems are using stale blaze indexes not known by Guardian.
Conditions: There are modems online from SPA downstream. Type clear cable modem all reset.
Modems come online from SPA downstream again.
Workaround: When you want to reset all the modems, type clear cable modem all delete.
•
CSCsw24639
Symptoms: In case of multicast and the forwarding is through WB interface, multicast SFs are
created and the counters are maintained under the WB interfaces.
Workaround: There are no workarounds.
•
CSCsu53695
Symptoms: When MVPN is configured on CMTS, and a CPE joins a multicast group that has a
source already transmitting to, then the (S,G) entry is not created in mvrf table of the CMTS.
Workaround: There are no workarounds.
•
CSCsv63763
Symptoms: PRE HA test shows that sometimes the voice call dropout time is larger than one second.
Conditions: Test the offnet call.
Workaround: There are no workarounds.
•
CSCsv12582
Symptoms: In numerous 10Ks running 12.3(21a)BC7 and BC8, the customer is seeing instances
where the CPE device disappears from the cable host table and sometimes from the ARP table. In
all cases, the CPE loses IP connectivity. This shows up across different CM vendors, different CLC
types, different plants, and different 10Ks.
Conditions:
– CPE loses connectivity.
– The CPE is not showing up on the CMTS using any "show" commands like show cable modem
or show cable modem
– Sometimes, the ARP entry for the CPE is seen in the ARP table.
– When the CPE sends a DHCPDISCOVER packet, the CNR responds with DHCPOFFER. But
for some reason, the CPE keeps sending DHCPDISCOVER.
Workaround: Try clear cable host until the device appears back in the host table. This may not work
always.
•
CSCsw89288
Symptoms: Show interface cable x/y/z SID will show null MAC address and null IP address SID
entries.
Conditions: IOS 12.3(17b)BC9, UBR10K CMTS
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-151
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsv59917
Symptoms: From logs collected from the customer's network, at least three routers show the
symptom of the problem. For the two SPAs installed in the Cisco Wideband SIP jacket card,
SPA1/0/1 lost all its configurations, including its IP and MAC addresses, and all its RF channel
configurations. SPA1/0/0 lost some of its configurations. IP and MAC addresses remain but some of
the RF channel configurations are missing. Recovery measures were attempted, including PRE S/O,
hw-module reset, unprovision/reprovision the SPAs, but none succeeded. Reloading the router
seems to be the only way to recover.
Workaround: Reloading the router is the only way to recover.
•
CSCsv54656
Symptoms: On a UBR10k the input rate counter of all GRE tunnels is incorrect. It is doubled
compared to the real value. Only tunnels interfaces are affected.
Conditions: This occurs on a UBR10k/ESR-PRE2 running IOS versions 12.3(23)BC1 and
12.3(23)BC2 and 12.3(23)BC5.
Workaround: There is no workaround.
•
CSCsw97150
Symptoms: When upgrading IOS and hardware, the existing configuration could conflict with the
channel IDs on other interfaces.
Conditions: Customer would like to see the DS channel IDs hidden, but viewable with a show
command, in order to avoid potential conflicts.
Workaround: Reconfigure downstream channel-id for any interface that has a conflicting ID.
•
CSCsx32213
Symptoms: A Cisco router may reload reporting a bus error.
Workaround: There is no workaround.
•
CSCsw38849
Symptoms: Backup DTCC card may experience an unexpected reload irregularly with following
messages:
Oct 14 23:01:25.487: %IPCOIR-3-TIMEOUT: KA Timeout: slot1/1, LRCV:00:00:07
LKA:00:00:07 LRMV:never, NKA:00:00:00, cpu 1%/1% 2%
Oct 14 23:01:25.491: %IPCOIR-3-TIMEOUT: KA Timeout: slot1/1, LRCV:never LKA:never
LRMV:never, NKA:00:00:00, cpu 1%/1% 2%
Oct 14 23:01:25.491: %IPCOIR-2-CARD_UP_DOWN: Card in slot 1/1 is down. Notifying
2cable-dtcc driver.
Oct 14 23:01:25.491: %UBR10K_ALARM-6-INFO: ASSERT CRITICAL slot 1/1/0 Active Card
Removed OIR Alarm - subslot 1
Oct 14 23:01:26.555: %IPCOIR-5-CARD_DETECTED: Card type 2cable-dtcc (0x5B0) in slot 1/1
Oct 14 23:01:26.555: %IPCOIR-5-CARD_LOADING: Loading card in slot 1/1
Oct 14 23:01:27.767: %C10K-5-LC_NOTICE: Slot[1/1] Line-card Image Downloaded...Booting...
Oct 14 23:01:45.580: %IPCOIR-5-CARD_DETECTED: Card type 2cable-dtcc (0x5B0) in slot 1/1
Oct 14 23:01:45.656: %UBR10KTCC-4-CHG_CLK_REF: Clock reference source set to DTI for
DTCC card 1/1
Oct 14 23:01:45.936: %UBR10K_ALARM-6-INFO: CLEAR CRITICAL slot 1/1/0 Active Card
Removed OIR Alarm - subslot 1
Oct 14 23:01:45.936: %IPCOIR-2-CARD_UP_DOWN: Card in slot 1/1 is up. Notifying 2cable-dtcc
driver.
Oct 14 23:01:47.040: %UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 1/1 port 1 DTI client status
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-152
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
changed to Active fast
Oct 14 23:02:20.042: %UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 1/1 port 1 DTI client status
changed to Active normal
Conditions: This problem is seen on only Backup DTCC irregularly of UBR10K running
12.3(23)BC2.
Workaround: There is no workaround.
•
CSCsw43250
Symptoms: PRE crashes after removing policy map.
Conditions: This is seen on a UBR10k with PRE3 running 12.3(21a)SB5 IOS.
Workaround: Do not remove policy map.
•
CSCek29193
Symptoms: Swapping unlike MC520 line cards (s, u) causes modems go offline, and configuration
lost.
Conditions: Default behavior of the cr10k card [slot/subslot]; oir-compatibility command must be
converted from default disabled to default enabled for all cable line cards.
Workaround: Prior to exchanging line cards, configure oir-compatibility for all slots. If line card
exchange happens without configuring oir-compatability, and the problem is discovered before a wr
mem is issued, perform the following workaround:
copy sec-nvram:startup-config to external box
edit card types from MC520s-d to MC520u-d
copy modified file to nvram:startup-config, and also sec-nvram:startup-config
reload
This is the only procedure which can ensure that the frequency stacking and virtual interface
configurations are preserved. Attempts to paste pieces of the previously stored running config will
fail if frequency stacking or virtual interfaces are configured, because the connectors must be
un-assigned first.
If a wr-mem has occurred, then the shutdown state and blank config for all interfaces will be written
to both primary and secondary nvram.This technique will not work without resorting to an externally
stored backup configuration for the system.
CMTS-Redundancy
•
CSCsv88650
Symptoms: Modems on modular interface suffer long-time recovery time or even fall offline after
switchover or revertback.
Conditions: Only affect 520S/520U card as active card. Only affect modems on modular interface.
More visible for annex A modulation type.
Workaround: There is no workaround.
•
CSCsw25895
Symptoms: Memory leak at cmts_hccp_get_tlv_parser_dat_gbl has been observed.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-153
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsw33866
Symptoms: Both the working cards 5/0 and protect card 5/1 are active.
Conditions: Do a LC SO from 5/0 to 5/1. After the synced, shut down 5/0/2 interface. Do a LC
revertback from 5/1 to 5/0. Do no shut 5/0/2 (Do not wait in between step3 and step 4). Now you
will find, after suspend timer expires, both 5/0 and 5/1 are active.
Workaround: Do not shut down an active protect interface. If both the cards (working and protect)
are active, reset protect card.
•
CSCsw76178
Symptoms: During LCHA, the CM instance bpi_enable flag (cminstp->priv_en) on RP is not synced
over correctly. This is observed for MC interface CM.
Conditions: Generate multicast stream to CMs, bpi CM during LC switchover.
Workaround: There is no workaround.
•
CSCsv14196
Symptoms: Secondary PRE crashes when DBS function is applied to wideband interface.
Conditions: Problem is seen on a PRE-2 running 12.3(23)BC2. To apply DBS, the customer has to
shut down the wideband interface first and then they met a IOS crash when
"chunk_free(docsis_srv_flow_chunk,flowp)" at the last step of cmts_destroy_ds_service_flow on
secondary PRE. No PXF happens.
Workaround: There is no workaround.
CMTS-Voice
•
CSCsr59753
Symptoms: 12.3(23)BC2 mixed docsis mode (atdma-tdma) can only achieve 40 UGS for an
upstream. But, 12.3(17b)BC9 can achieve 48 UGS flows.
Conditions: Currently, it looks like this may have something to do with mixed mode and modems.
Workaround: There is no workaround.
•
CSCsw29191
Symptoms: When TWC, the serviceflow in admitted state still has traffic going through.
Conditions: In three-way calling, and one side is on hold.
Workaround: There is no workaround.
CMTS-Wideband
•
CSCsv53276
Symptoms: The show controller modular-cable 1/0/0: command shows that rf-channel 0 become
unknown after hw-module reset.
SPA IP address = 192.168.5.1
SPA MAC Addr = 0012.001A.67D7 QAM
MOD ANNEX
TKB Interval Rate adjust State 0
Unknown Unknown 0
1
Enabled
====> unknown 1
QAM 256 Annex B 2423
132
Enabled 2
QAM
256 Annex B 2423
132
Enabled 3
QAM 256 Annex B 2423
132
Enabled
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-154
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: Happened after hw-module reset and show diag 1/0/0. This will cause all wideband
modems also go to NB.
Workaround: Reload the router to correct the issue.
Resolved Caveats — Cisco IOS Release 12.2(33)SCB1
The resolved caveats are grouped based on their component types.
CMTS-Application
•
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090908-tcp24.
•
CSCsv38166
The server side of the Secure Copy (SCP) implementation in Cisco IOS software contains a
vulnerability that could allow authenticated users with an attached command-line interface (CLI)
view to transfer files to and from a Cisco IOS device that is configured to be an SCP server,
regardless of what users are authorized to do, per the CLI view configuration. This vulnerability
could allow valid users to retrieve or write to any file on the device's file system, including the
device's saved configuration and Cisco IOS image files, even if the CLI view attached to the user
does not allow it. This configuration file may include passwords or other sensitive information.
The Cisco IOS SCP server is an optional service that is disabled by default. CLI views are a
fundamental component of the Cisco IOS Role-Based CLI Access feature, which is also disabled by
default. Devices that are not specifically configured to enable the Cisco IOS SCP server, or that are
configured to use it but do not use role-based CLI access, are not affected by this vulnerability.
This vulnerability does not apply to the Cisco IOS SCP client feature.
Cisco has released free software updates that address this vulnerability.
Workaround: There are no workarounds available for this vulnerability apart from disabling either
the SCP server or the CLI view feature if these services are not required by administrators.
This advisory is posted at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090325-scp.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-155
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsr29468
Cisco IOS software contains a vulnerability in multiple features that could allow an attacker to cause
a denial of service (DoS) condition on the affected device. A sequence of specially crafted TCP
packets can cause the vulnerable device to reload.
Cisco has released free software updates that address this vulnerability.
Several mitigation strategies are outlined in the workarounds section of this advisory.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20090325-tcp.
•
CSCsw81745
Symptoms: Modems may go offline with tdma-atdma mode if the US is configured with minislot
size as 4.
Workaround: Change the mini-slot size to 2.
•
CSCsw46178
Symptoms: While configuring a modular cable interface on cable SPA 3/3/0, there is a memory
corruption on the mac-domain host line card. This eventually causes the mac-domain host line card
to crash. If line card HA is configured, then after the line card crashes, an HA switchover to the
Protect LC is triggered, and the Protect LC will now start to crash.
Conditions: Cable SPA is in slot 3, bay 3, and default multicast QoS is configured on the CMTS.
Workaround: 1) Do not use slot 3 and bay 3 for cable SPA or 2) Do not configure multicast QoS on
the CMTS (including multicast QoS related to DSG).
•
CSCsw35246
Symptoms: Memory corruption on cable line card when running CMGEN image and CM GEN tests.
Conditions: CMGEN tests.
Workaround: There is no workaround.
•
CSCsv58913
Symptoms: When a Cisco uBR series CMTS is configured to perform CPE IP to MAC address
resolution through the use of DHCP LEASEQUERY messages rather than ARP, the address
resolution will fail when it is inspired by downstream packets to the unresolved destination.
Workaround: Temporarily allow downstream ARP resolution with the cable bundle interface
commands cable arp and cable proxy-arp.
•
CSCsv29206
Symptoms: Show interface x/y/z modem 0 may show duplicate MAC entries.
Workaround: There is no workaround.
•
CSCsv85010
Symptoms: MC520U card crashes due to TLB BUS error when too many "cable modem xxxx
change-frequency yyyy" commands are executed.
Conditions: More than one DS ports are connected to one HFC. When one line card crashes,
modems can be onlined to other line card’s DS port. LB is used.
Workaround: There is no workaround.
•
CSCsw94350
Symptoms: DBC w/ DS physical change invoked through the VDOC broadcast feature fails on the
SA-3000.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-156
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: VDOC broadcast RF-span feature is used w/ SA-3000 CMs.
Workaround: There is no workaround.
•
CSCsw74511
Symptoms: Multicast session of static IGMP group mess up after the LC switchover.
Conditions: Config static messiness group on if and do LC S/O.
Workaround: Do not config static session or do not let multicast client rejoin after a while.
•
CSCsw30738
Symptoms: IGMP query messages are not forwarded to the multicast client from CMTS when
modems are registered in modular interface with TLS. Due to this, packets are not received at the
client end.
Conditions: TLS and Multicast.
Workaround: There is no issue with legacy setup.
•
CSCsw25116
Symptoms: TLS data traffic either stops or forwarded uninterrupted after OIR of cable line card.
Conditions: TLS is provisioned on a CM with modular cable primary downstream and the modular
host is on a different line card than the MAC-domain host interface of the CM.
Workaround: There is no workaround.
•
CSCsx10305
Symptoms: Removing the dot1q vc map causes WAN interface to flap.
Conditions: uBR10k chassis running 12.3BC release. Removing the last dot1q vc map in the running
configuration caused the WAN interface to flap.
Workaround: There is no workaround.
•
CSCsw53285
Symptoms: Multicast traffic over DOCSIS L2VPN and TLS on secondary RF-channels of a D3.0
CM is dropped by the CM.
Conditions: CM is MDF disabled.
Workaround: There is no workaround.
•
CSCsv84262
Symptoms: The CMIM mask for pre-reg DSID is not correct. It should include the CM stack as well.
Conditions: The SA in REG-RSP/REG-RSP-MP should be in Dyanmic type for TLV64 request.
Workaround: There is no need to include GMAC for static DSID for MDF2 CM.
•
CSCsx22264
Symptoms: Break compiling cr7200 image.
Conditions: Compiling cr7200 image.
Workaround: After this fix, cr7200 image can be compiled.
•
CSCsx02709
Symptoms: After using dcc technique 1~4 move a modem from one channel to another channel, if
this modem has a rsvp flow then this rsvp flow db in rp will be lost after dcc.
Conditions: If modem has a rsvp service flow, load balance is enabled, and dcc-init-technique of
load balance group is from 1 to 4.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-157
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: Configuring dcc-init-technique of load balance group to 0.
•
CSCsw25227
Symptoms: Stale dynamicSF shown after PRE switchover.
Conditions: Moving CM which has dynamic service-flow created (dynamic service-flow created
through VDOC RSVP bandwidth reservation) to different upstream, and during PRE switchover
delete and re-added RSVP reservation.
Workaround: There is no workaround.
•
CSCsv99151
Symptoms: Downstrean dynamic service flow reserve CIR release from wrong channel if it change
from one dowstream channel to another because attribute mask change when DSC.
Conditions: Create a dynamic service flow with reserve CIR in one downstream channel with
attribute-mask configured. Change this attribute configuration, then if dynamic service flow is
changed, it maybe reassigned to another downstream channel, then the reserve bandwith would be
released from new assigned channel but not original channel.
Workaround: Do not change attribute-mask configuration when there are downstream dynamic
service flows created in it.
•
CSCsv94281
Symptoms: After PRE switchover, the throughput of MC/WB displayed by running the command
show interface X/Y/Z is much larger than the real value. After 10-20 minutes, the throughput
recovers automatically. On 12.3(23)BC, this also happens on legacy interface.
Conditions: PRE switchover.
Workaround: There is no workaround.
•
CSCsv73509
Symptoms: When TACACS is configured, no aaa new-model authentication happens through local.
This happens for the exec users under vty configuration.
Conditions: Configure no aaa new-model
Configure login local under line vty 0 4
Configure login tacacs under line vty 0 4
Workaround: There is no workaround.
•
CSCso55151
Symptoms: On a router with CEF switching turned on, a memory leak is observed for ARP packets.
Workaround: There is no workaround.
•
CSCsj19540
Symptoms: Ping to a /31 loopback interface in VRF fails.
Conditions: A loopback with a /31 address configured in a VRF.
Workaround: There is no workaround.
•
CSCsr72301
Symptoms: 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.
Workaround: Disable the HTTP server.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-158
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsv42988
Symptoms: When the routers are booted sequentially (bringing up the standby after the active boots
up), the routers fall into RPR instead of SSO.
Conditions: Seen with NAM module with SRC2 image.
Workaround: There is no workaround.
•
CSCsu77710
Symptoms: Improve debugability of CMTS chassis
Workaround: show tech-support
show tech-support cmts c\x\y\z
show tech-support cmts modem <ip/mac>
•
CSCsu58139
Symptoms: Cable trust does not seem to have any impact on source verification.
Conditions: Cable trust command can be used to prevent the CMTS from sending out DHCP LQ
when the source verification fails for a given CPE MAC address. But in spite of such a configuration,
CMTS seems to be sending out DHCP LQ when the source verification fails.
Workaround: There are no workarounds.
•
CSCsw48049
Symptoms: CMIpAddr may return 0 after a line card switchover.
Conditions: Configure ipdr and collector.
Workaround: There are no workarounds.
•
CSCsx21577
Symptoms: WB interface is in link state down after a PRE switchover. This causes the static mcast
forwarding to stop for the WB interface and causes static mcast to be created dynamically and
forwarded.
Conditions: The WB interface only goes into this error condition if the particular interface is brought
link up after the standby-pre is already up, and PRE switch over occurs.
Workaround: Do not bring a WB interface up after the standby-PRE is already up. The other
workaround is to do another PRE-switchover to go back to a new active PRE.
•
CSCsx23893
Symptoms: Replacing an MC520S/U/H with another MC520S/U/H causes modems to drop offline
and generate a console error message similar to the following:
ERROR: 1/0/0 rf-channel 0: already hosted under Ca5/1/1
The message indicates that an attempt was made to add the rf-channel on the Modular-Cable
controller in slot 1, subslot 0, bay 0 to another the MAC domain when it was already configured for
MAC Domain 1 on the Cable line card in slot 5, subslot 1.
Conditions: The problem occurs when the OIR-compatibility feature is invoked to preserve a line
card configuration across an OIR operation when the line card configuration contains remote
Modular-Cable downstreams and N+1. The compatibility feature is only invoked when a change of
card type is detected. Replacing an MC520 with the same card type will not cause the problem.
Workaround: There are no workarounds.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-159
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsx54947
Symptoms: WB modems reset after replacing an MC520 guardian card with a different type of
MC520, that is, an MC520U is replaced by an MC520H.
Conditions: Wideband modems will flap in an N+1 configuration under the following conditions:
1. The Guardian is included in a line card N+1 redundancy configuration
2. OIR compatibility is enabled on the working guardian's slot/subslot
3. The working guardian has failed to the protect card.
4. The working guardian is replaced by a different type of MC520.
Workaround: There are no workarounds.
•
CSCsx58283
Symptoms: WB modems resets after LC SO of guardian card through OIR method.
Workaround: Switchover the working card to the protect card before OIR the working card.
•
CSCsx60655
Symptoms: Aggregate MQoS session statistics not updated correctly.
Conditions: This issue occurs when aggregate MQoS is configured.
Workaround: Single MQoS session could be configured.
•
CSCsx69341
Symptoms: IPDR DOCID is incorrect. The first 8 hex digits of the docid are supposed to be seconds
since the Unix epoch. The collector shows:
0x48efa0fa = 2008-10-10 18:37:46.00
The CMTS reports:
0xCC98B503 = 2077-11-22 19:27:56.00
Conditions: This issue occurs when aggregate MQoS is configured.
Workaround: The current value subtract 70 years in seconds from 1 Jan 1900 to 1 Jan 1970.
CMTS-DOCSIS
•
CSCsw78501
Symptoms: When users use virtual interface, it is possible that Ingress Noise Cancellation
functionality on the upstream is wrongly activated or deactivated.
Conditions: 1) User used odd logical upstream channel ID with even physical port ID or even logical
upstream channel ID with odd physical port ID. 2) Only affect 5x20H/20x20H/2x8U cards.
Workaround: Use odd logical upstream channel ID with odd physical port ID and even logical
upstream channel ID with even physical port ID.
•
CSCsv01614
Symptoms: show cable modem wideband shows all MD-DS-SG as 1, and show cable mac-domain
rcc give different values for the MD-DS-SG that modems are assigned to.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-160
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsw44410
Symptoms: When an RCC template is configured and applied to an interface(for example a 4
channel RCC), and a fiber node is added containing only 3 out of the 4 channels, the CMTS
incorrectly creates an RCC association with the MD-DS-SG for that fiber node with 3 channels.
Workaround: Remove and reapply the RCC template from the interface.
•
CSCsx18138
Symptoms: Channels with center frequency greater than 850 MHz cannot be inputted as
receive-channels in rcc-templates. The SPA allows max frequency of 1050 MHz channels.
Workaround: Do not use RCC-templates when needing to use higher frequency than currently
supported 850.
•
CSCsx07000
Symptoms: Certain cable modems are shown stuck in the sreject(na) state on rare occasions.
Conditions: In the event a cable modem returns a confirmation-code of partial-service (30) in the
REG-ACK message, the CMTS treats this as an error, thus leaving the CM in the sreject(na) state.
Workaround: There is no workaround.
•
CSCsw88346
Symptoms: CMs stuck in init(i), init(o) after a TFTP server outage with Dynamic Shared Secret on
interfaces configured with DMIC Reject or Marked.
Conditions: Seen only on the interfaces which are configured with DSS. Seen only when the TFTP
server has some reachability problems. Seen in both ubr7200 and ubr10k and different IOSes
(12.3(9a)BC6, 12.3.13a-BC1,12.3(23)BC2)
Workaround: Remove DSS from the cable interface.
•
CSCsw28992
Symptoms: Using the test cable dcc command from the modular to the native interface moves the
CM just fine. Using the test cable dcc command from the native to the modular drives the CM
offline, at which point it's reported [offline] on another native DS where it can never possibly
register by the cable plant design. Finally the CM reaches the right online on the right DS again.
Conditions: Wideband Cable deployment. The CM must fail to move from the native to the modular
DS.
Workaround: When the CM is allowed to recover it is reported under a correct interface.
•
CSCsv91271
Symptoms: CMs stuck in init(i), init(o) after a TFTP server outage with Dynamic Shared Secret on
interfaces configured with DMIC Reject or Marked.
Conditions: Seen only on the interfaces which are configured with DSS. Seen only when the TFTP
server has some reachability problems. Seen in both ubr7200 and ubr10k and different IOSes
(12.3(9a)BC6, 12.3.13a-BC1,12.3(23)BC2)
Workaround: Remove DSS from the cable interface.
•
CSCsv91271
Symptoms: After wideband cable modem doing DCC, show cable modem info as command "scm",
the warning message "Warning: Zero Blaze index for SFID" is displayed.
Conditions: 1. Wideband cable modem on line. 2. Doing DCC.3. show cable modem information as
CLI command "scm".
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-161
Chapter 2
•
Caveat List for Cisco IOS Release 12.2(33)SCB
CSCsw64992
Symptoms: PRE2 crashes when no card xxxx is executed.
Conditions: no utility card, then no any spa on the same slot number.
Workaround: Do not do no utility card.
•
CSCsw71440
Symptoms: US bitmap is not updated after changing max-ports.
Conditions: Change the upstream max-ports using the command cable upstream max-ports and
configure US connector to the new upstream channel.
Workaround: Remove and reconfigure the cgd configuration under that mac-domain if max-port is
changed.
•
CSCsv04901
Symptoms: When a 520H is in normal operation condition, modems on one or a few upstreams get
into a bad state, and all modems on the affected upstreams go offline, while other upstreams are still
functioning. This affects only 520H LC on all releases.
Conditions: Traffic on upstreams.
Workaround: Issue a shut/no shut on the affected upstreams recovers it, and modems come back
online. Upgrade to 12.3(23)BC6.
•
CSCsx38826
Symptoms: Docsis 2.0 modems stuck in reject(na) on a CMTS with 12.2(33)SCB code.
Conditions: Registering a modem using service class names for service flow definitions.
Workaround: Do not use service class names in modem configuration, or make sure that modem
firmware is such that unknown service flow TLVs are ignored instead of rejected.
CMTS-Drivers
•
CSCsr74034
Symptoms: Ironbus restarts have been observed on the Cisco uBR10012 due to ironbus link status
0x1180 errors. You observe the following messages in the PRE log:
------------------------------------------------------------------------------------------------------ 811468:
Jun 17 03:10:17.233 UTC: slotindex is 8. 811469: Jun 17 03:10:17.233 UTC: IB Link status:
00001180 811470: Jun 17 03:10:17.233 UTC: %C10KEVENTMGR-1-IRONBUS_FAULT:
Ironbus Event 5/0, Restarting Ironbus 811471: Jun 17 03:10:17.645 UTC:
%C10KEVENTMGR-1-IRONBUS_SUCCESS: Ironbus Event 5/0, Restart Successful
----------------------------------------------------------------------------------------------------The ironbus link status 0x1180 error will trigger an line card switchover on uBR10012s configured
with N 1 redundancy. The ironbus restart is fast enough to keep modems online and has negligible
affect to customers on uBR10012s without N 1 redundancy.
Conditions: This ironbus link status 0x1180 error has only been observed on slot 5/0 with the
following hardware configuration. - Working MC520H Linecard in slot 5/0 (the problem has not
been reported on the MC520U/S cards) - Active PRE2 in slot A (the problem has not been reported
on a PRE1)
The CMTS BU is still investigating the root cause of the ironbus link status 0x1180
error.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-162
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There are two workarounds for ironbus link status 0x1180 error 1. Use Active PRE2
in slot B 2. Do not use a MC520H in slot 5/0
Customers should not RMA any equipment due
to the ironbus link status 0x1180 error. The CMTS BU has not confirmed that this is a hardware
issues and would need to identify the faulty hardware (e.g., PRE2, MC520H, chassis) if it is a
hardware issue.
CMTS-ISSU
•
CSCsw32803
Symptoms: When a CLC is Do not running at 99% CPU load, IPC timeout triggered traceback will
be seen on the CLC, or CLCs that sending IPC messages to this LC.
Conditions: When a CLC has high CPU usage.
Workaround: Try to find out the cause of high CPU usage. If it is due to excessive SNMP polling,
reduce the SNMP polling.
•
CSCsw46018
Symptoms: IPC connection between RP and CLC may take one extra second to come up at ISSU
runversion.
Conditions: At issu runversion, when standby RP becomes active with the new version.
Workaround: There is no workaround.
•
CSCsv60554
Symptoms: The purpose of this enhancement is to restrict access to the HA redundancy cmds during
the "issu linecard changeversion" process.
The following additional commands are restricted during uBR10K ISSU. This prevents the RF
switch configuration from being altered during upgrade, and avoids switchover failures because of
that.
Router(config-red-lc)#rf-switch snmp-community xxx
Router(config-red-lc)#rf-switch name xxx
Router(config-red-lc)#rf-switch protection-mode xxx
•
CSCsw29445
Symptoms: Double commit fix from cobra_cable to throttle rebuild 1.
Workaround: There is no workaround.
CMTS-Management
•
SCsv66509
Symptoms: Bad dequeue error is seen at "CMTS METERING EXPORT Process".
Conditions: When 45K cable modems and IPDR are configured.
Workaround: There is no workaround.
•
CSCsx57790
Symptoms: ccwbFiberNodeNBIfIndx returns 0 if item's rfid belongs to modular interface.
Conditions: Configure fiber node with donwstream modular cable and then getmany -v2c
ccwbFiberNodeNBIfIndx
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-163
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Workaround: There is no workaround.
•
CSCsx62927
Symptoms: IPDR data collection from CLC to RP might congest the BPE due to its high bursty
traffic pattern.
Workaround: This fix aims at throttling the data collection and added control to the throttling via a
new command.
command addition: (config) [no] cable metering data-per-session X timer Y
Range X: 3-30
Range Y: 8ms - 500ms
Default X: 5 (size of each data is approx 1KB. So 5KB burst)
Default Y: 100ms
The above command controls the number of IPDR data sent per session (X) in an interval of time
(Y). It will be visible only if one changes the default settings. It cannot be changed during data
export. The show cable metering verbose command is extended to show the data-per-session and
timer when the IPDR data export is IN Progress.
In addition, the range of the command has been changed. Cable metering destination range has been
reduced to 2 minutes. 2min-1440min
Due to the newly added IPDR throttling mechanism the time to export of all the IPDR data is longer.
It would approximately be time_to_export (minutes) = ( total_flows * Y) / ( X * 1000 * 60 ), where
X and Y are configurable via the newly added command.
CMTS-Platform
•
CSCsv83365
Symptoms: PRE2 crashed multiple times at sch_rp_cm_reg_info_request_handler process.
Workaround: There is no workaround.
•
CSCsw32928
Symptoms: The bug causes ironbus restart on a reload.
Conditions: When reload is typed on RP console, sometimes user could see "Ironbus restarting"
prints on RP console.
Workaround: There is no workaround.
•
CSCsw24218
Symptoms: When the following commands are run from RP or LC continuously, it causes line card
CPUHOG, IPC timeout and line card crash or reset.:
test cable phydump c7/1/0
test cable phydump c7/1/1
Workaround: Do not run "test cable phydump c7/1/0" and add some sleep between commands. Run
the command like:
1. test cable phydump c7/1/0 phy 0
2. tes cable phydump c7/1/0 phy 1
3. sleep 1s
1. test cable phydump c7/1/0 phy 2
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-164
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
2. tes cable phydump c7/1/0 phy 3
•
CSCsv99158
Symptoms: Modular modems offline when changev all minor or major MDR is executed.
Conditions: The ISSU pre runversion will cause sequentially reload of both DTI cards. After the
reload, only one card is up and the port of the other card is down with no signal.
Workaround: There is no workaround.
•
CSCsw85400
Symptoms: sinit and sreject states show up on a Cisco uBR10012 router running the 12.2(33)SCB
release. However, no EAE is configured.
Conditions: Doing an HCCP failover.
Workaround: There is no workaround.
•
CSCsv10205
Symptoms: Modems go off line.
Conditions: pre-eq is enabled with ATDMA 64QAM 6.4Mz.
Workaround: Use a different modulation profile.
•
CSCek41611
Symptoms: The Cisco MC5X20U cards may experience a silent reload and no crashinfo file is
written to bootflash.
Conditions: This is seen on a PRE 2 processor moule running Cisco IOS Release 12.3(13a)BC2.
Workaround: Upgrade to Cisco IOS Release 12.2(33)SCB2.
•
CSCsv89704
Symptoms: RPC message to read EEPROM of SPA is failed because RPC timeout.
Conditions: When SPA CPU is occupied by a task for a long time, for instance FPD reprogramming
task is updating FPGAs.
Workaround: There is no workaround.
•
CSCsw74136
Symptoms: show diag 2/1 for TCC not available on CMTS.
Conditions: Using 122SC based IOS image.
Workaround: There is no workaround.
•
CSCsv63086
Symptoms: Blaze index is not cleared from service flow when WB interface is shut.
Conditions: When WCM is on w-online. After Wide-Band interface is shut, WCM is offline, and
when it comes back with modular online, it uses the original Blaze Index.
Workaround: There is no workaround.
•
CSCsd27602
Symptoms: A new message appears in the console log indicating that a card type has changed. For
example, if the MC520U-D in subslot 8/1 is replaced by an MC520S-D, the following message is
displayed:
%UBR10K-6-COMPAT_NEW_CARD: The 5cable-mc520u-d in slot 8/1 has been replaced by a
5cable-mc520s-d
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-165
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: The message appears when an OIR operation involves two different types of MC520
line cards. For example, when an MC520U is replaced by an MC520H. The message does not appear
for cards other than the MC520S/U/H. It also does not appear if the OIR operation involves identical
MC520 card types. For instance, it will not appear if an MC520U is replaced by another MC520U.
Workaround: This is not a failure so no workaround is needed.
•
CSCsu76930
Symptoms: When setting the Fragment-force 2000 the upstream performance drops to zero. There
is no upstream throughput.
Conditions: Problem is found only on the 5x20s card with ios ubr10k2-k8p6u2-mz.123-23.BC1.
Workaround: Put Fragment-force to Frag-force 1987 for best performance.
•
CSCsw49056
Symptoms: Incorrect statistics displayed due to loss of periodic push statistics packets.
Conditions: Problem is found only on the 5x20s card with ios ubr10k2-k8p6u2-mz.123-23.BC1.
Workaround: There is no workaround.
•
CSCsw93337
Symptoms: On a 10k running 12.2(33)SCB, this bug is to address an issue where the controller
Modular-Cable will show up in the wrong order in running-config if more than one is inserted into
the chassis.
Conditions: More than one 24XDS SPA inserted into a chassis where 12.2(33)SCB is running.
Workaround: There are no workarounds.
•
CSCsx24146
Symptoms: Since the sflow statistics are pushed to the 5x20 cable line card every ten seconds, there
is a potential to lose up to ten seconds worth of statistics since this IPC message will reset the blaze
hw.
Conditions: This could happen every ten seconds.
Workaround: There are no workarounds.
•
CSCsx45592
Symptoms: 12.2(33) beta and FCS images create default channel IDs that are duplicated across slots
5/0 through 8/1 on the uBR10k chassis.
Conditions: Configuring the same downstream channel from two different line cards to the same
fibernode will create an invalid fibernode due to the channel id conflict and therefore requires the
user to reconfigure one of the channel ids to a value other than the default. Fibernode status can be
seen with show cable fibernode.
Workaround: Manually reconfigure the downstream channel id such that they do not conflict in the
fibernode.
•
CSCsx63371
Symptoms: 520H card crash.
Conditions: PREs s/o. Because it is a timing issue, it does not happen every time. In fact, it is hard
to reproduce.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-166
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
CMTS-PRE4
•
CSCsw25867
Symptoms: Memory leak is seen after running the command show debug debug leaks.
Workaround: There is no workaround.
CMTS-PXF
•
CSCsx18479
Symptoms: When applying a QoS policy to the main interface on a CMTS uBR10k router, the policy
does not work for the subinterfaces.
Conditions: QoS applied on an interface that has subinterfaces configured.
Workaround: Configure the service-policy on the main interface before creating the subinterface.
•
CSCsx79761
Symptoms: This problem is seen when doing source-verify on multicast packets. If the source IP
address requires a final-level lookup in the M-TRIE, source-verify will likely fail. The packet could
be diverted or dropped.
Conditions: This affects PRE-2 and PRE-4 in 12.2 releases. The 12.3 releases are not affected.
Workaround: There is no workaround.
CMTS-Redundancy
•
CSCsw74713
Symptoms: Modems are in w-online state with two channel bonding, primary interface on local 520
card. After LCSO, modems still in w-online state and accessible, then clear all modems and wait till
online. Some modems come up online in legacy mode instead of wideband mode.
Conditions: Include x/y/0 - x/y/4 in one fiber node. After LCSO, only x/y/0 and x/y/1 could work.
MDD for x/y/2 x/y/3 x/y/4 are wrong.
Workaround: Only include x/y/0 and x/y/1 in fiber node.
•
CSCsw47192
Symptoms:PRE2 crashes when trying to remove rfsw-community from linecard-group.
Conditions: Remove line card from redundancy group.
Workaround: There is no workaround.
•
CSCsw78469
Symptoms: Wbcm cannot online after removing module-host. From the log, the LC continues to
send the MDD to modems, which will push the modems to w-online and cmts denies it.
Conditions: 1. Remove module-host 7/0 2. Adding module-host 7/0 3. LCSO 7/0 4. Remove
module-host 7/0.
Workaround: There is no workaround.
•
CSCsw74411
Symptoms: Modem does not response to ping after PRESO when LCSO occurs in booting Sec PRE.
Conditions: There are two ways to reproduce:
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-167
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Way 1:
Step:
1 bootup active PRE
2 bootup secondary PRE
3 LC switchover
4 PRE switchover
5 PRE switchover
Way 2:
1 bootup active PRE, LC switchover
2 bootup secondary PRE
3 PRE switchover
Workaround: 1. Before PRE swithover, do LC revert back and then swithover. 2. Only 1 protect 1.
•
CSCsw68704
Symptoms: WB modem can get wb-online.
Conditions: "shutdown" and "no shutdown" an active protect interface.
Workaround: Do not shutdown an active protect interface.
•
CSCsw35991
Symptoms: A few cable modems may become offline during the ISSU upgrade, specifically during
the ISSU line card prepareversion phase. Those few modems come back online shortly afterwards.
Conditions: There are multiple cable line cards being upgraded through ISSU in sequence, with one
or more cable line cards being the modular host. The cable line cards being upgraded subsequent to
the modular host cable line cards may encounter this symptom.
Workaround: There is no workaround.
•
CSCsx41593
Symptoms: Secondary PRE keeps crashing by bus error.
Conditions: After changing the bonding-group-id on wideband interface. After PRE switchover, or
hw-module sec-cpu reset.
Workaround: Chassis power off/on, or just reload active PRE.
CMTS-Spectrum
•
CSCsw43997
Symptoms: Customer is using a customized modulation profile that was working in 12.3(23)BC but
is not working in 12.2S. It is causing modems to fall offline and register on a different upstream.
Workaround: 1) Reduce the preamble length of the station ranging burst
cable modulation-profile 123 initial 5 34 0 48 qpsk scrambler 152 no-diff 256 fixed
cable modulation-profile 123 station 5 34 0 48 16qam scrambler 152 no-diff 256 fixed
2) set both initial and station to 16qam.
cable modulation-profile 123 initial 5 34 0 48 16qam scrambler 152 no-diff 392 fixed
cable modulation-profile 123 station 5 34 0 48 16qam scrambler 152 no-diff 392 fixed
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-168
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
CMTS-Voice
•
CSCsx21790
Symptoms: Intermittent packet cable call drops on ubr10K. Second attempt is always successful.
Conditions: Running IOS 12.3(17a)BC7.
Workaround: There is no workaround.
CMTS-Wideband
•
CSCsv30617
Symptoms: When the IP set-top-box (STB) or CPE sends an IGMPv2 leave for a multicast group
that is configured for static forwarding based on "ip igmp static-group" interface configuration on
the CMTS, then the CMTS stops forwarding the stream.
Conditions: This issue happens when there is a static-group configuration for SSM on the CMTS
and CPE is sending ASM join to that SSM group range. When IGMP leave for that SSM range is
received, CMTS mistakenly removes the forwarding entries and multicast forwarding stops.
Workaround: Add an input ACL to the bundle interface to block all igmp packets on the upstream
for streams that are configured for static forwarding on the CMTS.
•
CSCsv94090
Symptoms: When using modem-method load balancing, the docsis 3.0 modems are counted as
single modem PER downstream channel. This results in many D3.0 modems on 1 channel, which
means D2.0 modems will get pushed off, leaving that channel only for bonded traffic (in the case
that Dynamic Bandwidth Sharing is in use, with the SPA channel given 90% remaining ratio for
both types of traffic i.e. best effort).
If the D3.0 modem was counted as a single modem on the
Bonded Group of channels i.e. on 3 channels, then they would not influence the movement of D2.0
modems as the D3.0 modems would appear to be equally spread across the SPA channels.
Conditions: D3.0 Modem with 12.3(23)BC5. Load Balance is enabled.
Workaround: There is no workaround.
•
CSCsx13801
Symptoms: Traceback pops out.
Conditions: 1) Having CGD configuration 2) LC SO 3) LC revertback.
Workaround: There are no workarounds. It does not impact the service.
Open Caveats — Cisco IOS Release 12.2(33)SCB
The open caveats are grouped based on their component types. The open caveats documented from prior
releases that are unresolved might also apply to this release.
CMTS-Application
•
CSCsv85010
Symptom: MC520U card crashes due to TLB BUS error when too many "cable modem xxxx
change-frequency yyyy" command are executed.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-169
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions: More than one DS ports are connected to one HFC. When one LC crashes, modems can
be onlined to other LC's DS port. LB is used.
Workaround: There are no workarounds.
•
CSCsw35379
Symptom: Periodic 1 second delays between ubr10k transmission of SAMIS packets; enough of
these are occurring to make a significant impact on overall SAMIS transfer time.
•
CSCsu22450
Symptom: Inactive sessions are observed in the multicast explicit tracking database.
Conditions:IGMP leave received for a group followed by a CLC switchover
Workaround:None
•
CSCsu53695
Symptom: When MVPN is configured on the CMTS, and a CPE joins a multicast group that a
source.
Conditions: The issue only happens when igmp join arrives at the same time no mutlicast data
sendingis already transmitting to, then the (S,G) entry is not created in mvrf table of the CMTS.
Workaround: There are no workarounds.
•
CSCsr15678
Symptom: Traceback observed after a uBR10000 PRE switchover
%COMMON_FIB-4-FIBNULLHWIDB: Missing hwidb for fibhwidb Tunnel1 (ifindex 144)
Conditions: Multicast VPNs are configured
Workaround: There are no workarounds.
•
CSCsq45997
Symptom: Throughput rate shows (slightly) more than than the expected range.
Conditions: Happens when DMIC feature enabled and modem marked with given MAX rate values.
This can also happen when QoS profile has got lower Max rates.
Workaround: No known workaroud exists. This behaviour is mostly due to smaller value of the
MAX-rate, which is not very much applicable with customer scenario. Also the slight change on
the throughput values does not have impact on other functionalities
•
CSCsv99151
Symptom:Downstrean dynamic service flow reserve CIR release from wrong channel if it change
from one dowstream channel to another because attribute mask change when DSC.
Conditions: Create a dynamic service flow with reserve CIR in one downstream channel with
attribute-mask configured. Change this attribute configuration, then if dynamic service flow is
changed, it maybe reassigned to another downstream channel, then the reserve bandwith would be
released from new assigned channel but not original channel.
Workaround: Do not change attribute-mask configuration when there are downstream dynamic
service flows created in it.
•
CSCsu18117
Symptom:
ToS value on MCAST packets are being incorrectly overwritten.
Conditions: This is in 12.2(33)SCB.
Workaround:
There is no workaround
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-170
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
•
CSCsu37019
Symptom: IGMP join from a cable CPE is timed out improperly by the CMTS.
Conditions: IGMP query interval is set to a large value on the cable bundle interface.
Workaround: There is no workaround.
•
CSCsv11435
Symptom: When modem comes up during off-peak time when it is not supposed to be monitored as
per enforce-rule configured, the smp is not synced to standby LC.
Conditions: If an LC- Switchover is done during off-peak time, Even if the modem enters peak-time,
its not monitored as per the enforced rule configured.The smp is synced to standby LC only once
the modem is monitored during peak-time.
CMTS-Database
•
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
CMTS-DOCSIS
•
CSCsv52737
Symptom: The Cisco uBR10012 doesn't properly reinitialize the sequence number field in the DS
extended header of the first packet transmitted on a newly created resequencing DSID. There's no
problem in case CM is prepared to receive a non-zero initial sequence number but Cisco uBR should
meet the following specification. --- CM-SP-MULPIv3.0-I08-080522 --- 8.2.3 Sequenced
Downstream Packets (snip) The CMTS MUST use a Packet Sequence Number of zero (0) in the
DS EHDR of the first packet transmitted on a newly created Resequencing DSID.
Workaround: None
•
CSCsv79969
Symptom: Packet classifier match count is a 32-bit signed counter. It goes negative when it goes
above 2 billion packets.
Workaround: There is no workaround.
•
CSCsq64227
Symptom: The Number of Downstream PHS rules for a Cable MAC Domain stays the same even
though more downstreams can be added to the MAC Domain (via Modular Downstreams).
Workaround: There is no workaround.
•
CSCsw28992
Symptom: Using the test cable dcc command from the modular to the native interface moves the
CM just fine. Using the test cable dcc command from the native to the modular drives the CM
offline, at which point it's reported [offline] on another native DS where it can never possibly
register by the cable plant design. Finally the CM reaches the right online on the right DS again.
Conditions: Wideband Cable deployment. The CM must fail to move from the native to the modular
DS.
Workaround: When the CM is allowed to recover it is reported under a correct interface.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-171
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
CMTS-Drivers
•
CSCsr74034
Symptom: Ironbus restarts have been observed on the Cisco uBR10012 due to ironbus link status
0x1180 errors. You observe the following messages in the PRE log:
------------------------------------------------------------------------------------------------------ 811468:
Jun 17 03:10:17.233 UTC: slotindex is 8. 811469: Jun 17 03:10:17.233 UTC: IB Link status:
00001180 811470: Jun 17 03:10:17.233 UTC: %C10KEVENTMGR-1-IRONBUS_FAULT:
Ironbus Event 5/0, Restarting Ironbus 811471: Jun 17 03:10:17.645 UTC:
%C10KEVENTMGR-1-IRONBUS_SUCCESS: Ironbus Event 5/0, Restart Successful
----------------------------------------------------------------------------------------------------The ironbus link status 0x1180 error will trigger an line card switchover on uBR10012s configured
with N 1 redundancy. The ironbus restart is fast enough to keep modems online and has negligible
affect to customers on uBR10012s without N 1 redundancy.
Conditions: This ironbus link status 0x1180 error has only been observed on slot 5/0 with the
following hardware configuration. - Working MC520H Linecard in slot 5/0 (the problem has not
been reported on the MC520U/S cards) - Active PRE2 in slot A (the problem has not been reported
on a PRE1)
The CMTS BU is still investigating the root cause of the ironbus link status 0x1180
error.
Workaround: There are two workarounds for ironbus link status 0x1180 error 1. Use Active PRE2
in slot B 2. Do not use a MC520H in slot 5/0
Customers should not RMA any equipment due
to the ironbus link status 0x1180 error. The CMTS BU has not confirmed that this is a hardware
issues and would need to identify the faulty hardware (e.g., PRE2, MC520H, chassis) if it is a
hardware issue.
CMTS-Management
•
CSCsv82525
Symptom: When setting wide band interface to secondary through snmp, it doesn't work as
expected.
Conditions: This symptom is observed in a wide band cmts which configure the wide band
interfaces.
Workaround: Modify the wideband configuration through the CLI.
•
CSCsw26022
Symptom: Memory leak at buffer_peak_notify has been observed.
Workaround: There is no known workaround at this time.
CMTS-Packetcable
•
CSCso63567
Symptom: When CM is primaryed on modular interfce, multiple vioce call tone were observed when
bulk call is ongoing. Dropout time is about 4500~5000ms It is difficult to be reprodced on other
testbed.
Workaround: There is no workaround.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-172
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
CMTS-Platform
•
CSCsu76930
Symptom: When setting the Fragment-force 2000 the upstream performance
is no upstream thought-put.
drops to zero. There
Conditions: Problem is found only on the 5x20s card with ios ubr10k2-k8p6u2-mz.123-23.BC1.
Workaround: Put Fragment-force to Frag-force 1987 for best performance.
•
CSCsv83365
Symptom: PRE2 crashed multiple times at sch_rp_cm_reg_info_request_handler process.
Conditions: Above problem has been observed on ubr10K with PRE2 running Cisco IOS Release
12.3(23)BC4.
Workaround:There is no workaround.
•
CSCsu01822
Symptom: CMTS crashed at c10k_remote_crash_interrupt.
Conditions: The issue happens when continuously configuring 21BC customer configs.
Workaround: There is no workaround.
•
CSCsv54656
Symptoms: On a UBR10k the input rate counter of all GRE tunnels is incorrect. It's doubled
compared to the real value. Only tunnels interfaces are affected.
Conditions: This occurs on a UBR10k/ESR-PRE2 running IOS versions 12.3(23)BC1 and
12.3(23)BC2 and 12.3(23)BC5.
Workaround: There is no workaround.
•
CSCsv63445
Symtoms: 1)Do not configure any fiber node. 2)Bring some narrow band modems online from SPA
downstream. 3)Type "clear cable modem all reset" to reset modems. After this command, all the
stat/BPI/PHS indexes in the modular-host tables are expected to be freed by design. But, this didn't
happen. None of those indexes are freed. Consequence: This will cause stat/BPI/PHS indexes pool
leaking, and leading to CMTS scalability issue, i.e., CMTS won't be able to support the stated
amount of modems online from SPA downstream. Root cause: The current implementation for
"clear cable modem all reset" is implemented for wideband modems, which checking the WB/NB
association before releasing the indexes. This is not appropriate for a system which doesn't have
fiber-node configuration, and is only to support NB modems.
Workaround: There is no workaround.
•
CSCsv10205
Symptoms: Modems go off line.
Conditions: pre-eq is enabled with ATDMA 64QAM 6.4Mz
Workaround: Use a different modulation profile.
•
CSCsv59917
Symptoms: From logs collected from the customer's network, at least three routers show the
symptom of the problem. For the two SPAs installed in the Cisco Wideband SIP jacket card,
SPA1/0/1 lost all its configurations, including its IP and MAC addresses, and all its RF channel
configurations. SPA1/0/0 lost some of its configurations. IP and MAC addresses remain but some of
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-173
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
the RF channel configurations are missing. Recovery measures were attempted, including PRE S/O,
hw-module reset, unprovision/reprovision the SPAs, but none succeeded. Reloading the router
seems to be the only way to recover.
Workaround: Reloading the router is the only way to recover.
•
CSCsw38849
Symptoms: Backup DTCC card may experience a unexpected reload irregularly with following
messages. Oct 14 23:01:25.487: %IPCOIR-3-TIMEOUT: KA Timeout: slot1/1, LRCV:00:00:07
LKA:00:00:07 LRMV:never, NKA:00:00:00, cpu 1%/1% 2% Oct 14 23:01:25.491:
%IPCOIR-3-TIMEOUT: KA Timeout: slot1/1, LRCV:never LKA:never LRMV:never,
NKA:00:00:00, cpu 1%/1% 2% Oct 14 23:01:25.491: %IPCOIR-2-CARD_UP_DOWN: Card in
slot 1/1 is down. Notifying 2cable-dtcc driver. Oct 14 23:01:25.491:
%UBR10K_ALARM-6-INFO: ASSERT CRITICAL slot 1/1/0 Active Card Removed OIR Alarm subslot 1 Oct 14 23:01:26.555: %IPCOIR-5-CARD_DETECTED: Card type 2cable-dtcc (0x5B0)
in slot 1/1 Oct 14 23:01:26.555: %IPCOIR-5-CARD_LOADING: Loading card in slot 1/1 Oct 14
23:01:27.767: %C10K-5-LC_NOTICE: Slot[1/1] Line-card Image Downloaded...Booting... Oct 14
23:01:45.580: %IPCOIR-5-CARD_DETECTED: Card type 2cable-dtcc (0x5B0) in slot 1/1 Oct 14
23:01:45.656: %UBR10KTCC-4-CHG_CLK_REF: Clock reference source set to DTI for DTCC
card 1/1 Oct 14 23:01:45.936: %UBR10K_ALARM-6-INFO: CLEAR CRITICAL slot 1/1/0 Active
Card Removed OIR Alarm - subslot 1 Oct 14 23:01:45.936: %IPCOIR-2-CARD_UP_DOWN:
Card in slot 1/1 is up. Notifying 2cable-dtcc driver. Oct 14 23:01:47.040:
%UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 1/1 port 1 DTI client status changed to Active
fast Oct 14 23:02:20.042: %UBR10KTCC-1-DTIPORTCLIENT: DTCC slot 1/1 port 1 DTI client
status changed to Active normal
Conditions: This problem was seen on only Backup DTCC irregularly of uBR10K running
12.3(23)BC2.
Workaround: There is no workaround.
•
CSCsv95785
Symptoms: CLI shows 0-23 for ports, always 0-3 for subslot/bay.
Conditions: 12.3(23)BC, 12.2(33)SCA, 12.2(33)SCB, cobra_cable
Workaround: There is no workaround.
•
CSCsu33316
Symptoms: The CLC is crashing after the execution of the commands 'clear arp' and 'clear cable
modem all delete'.
Workaround: No workaround.
•
CSCsv12582
Symptoms:When running 12.3(21a)BC7 and BC8, there are instances where the CPE device will
disappear from the cable host table and sometimes from the ARP table. In all cases, the CPE loses
IP connectivity. This shows up across different CM vendors, different CLC types, different plants,
different 10ks. (This has also been seen in earlier IOS versions, including 12.3(17b)BC8. These
are usually the symptoms seen: a) CPE loses connectivity. b) The CPE is not showing up on the
CMTS using any "show" CLI like, "show cable modem <cm> <cpe>" or "show cable <interface>
modem <sid>" c) Sometimes, the ARP entry for the CPE is seen in the ARP Table. d) When the
CPE sends a DHCPDISCOVER packet, the CNR responds with DHCPOFFER. But for some
reason, the CPE keeps sending DHCPDISCOVER. e) The work around is to clear the host by
running the CLI "clear cable host". f) Although the CPE is not found in any of the "show" CLIs,
"clear cable host" when ran for the first time, does not complain, indicating that some part of the
CPE information is still resident in the memory. g) After the "clear cable host" is ran a couple of
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-174
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
times (Until the error, "No such host" is seen), the CPE successfully acquires the IP address.
Workaround at this point is to try "clear cable host" until the device appears back in the host table.
Does not work 100% of the time.
Workaround: Workaround only sometimes works, and that's to "clear cable host" for the CPE device
until the device shows up on the CPE table again.
•
CSCsr20944
Symptoms: Executing the show interface bundle or show interface bundle sum/stat commands
shows wrong rate, then the rate value becomes 0 after a while.
Conditions: Data rate reaches a large value, such as 2G. It depends on the load-interval value and
the rate.
Workaround: There is no workaround.
CMTS-Redundancy
•
CSCsw25963
Symptom:
Memory leak at sch_rp_update_cm_cfr_list has been observed.
Workaround: There is no workaround.
•
CSCsv91050
Symptom: msid for same group changed after PRE SO. It will not impact mcast traffic and just show
different msid before and after PRE SO.
Conditions: Setup msession then delete. Setup msession again and do PRE SO, the related msid is
different before and after PRE SO.
Workaround: After PRE SO, send IGMP leave to re-trigger msession deletion.
•
CSCsv14196
Symptom: The crash has occurred on the secondary PRE when try to apply DBS function to
wideband interface.
Conditions: Problem is seen on a PRE-2 running 12.3(23)BC2, - To apply DBS, the customer has
to shut down the wideband interface first, then they met a IOS crash when
"chunk_free(docsis_srv_flow_chunk,flowp)" at the last step of cmts_destroy_ds_service_flow on
secondary PRE. No PXF happens.
Workaround: None.
•
CSCsw35991
Symptom: A few cable modems may become offline during ISSU upgrade, specifically during the
ISSU line card prepareversion phase. Those few modems come back online shortly afterwards.
Conditions:There are multiple cable line cards being upgraded via ISSU in sequence, with one or
more cable line cards being the modular host. The cable line cards being upgraded subsequent to
the modular host cable line cards may encounter this symptom.
Workaround: There is no workaround.
•
CSCsv88650
Symptom: Modems on modular interface suffer long-time recovery time or even fall offline after
switchover or revertback.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-175
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Conditions:1. only affects 520S/520U card as active card. 2. only affects modems on modular
interface 3. more visible for annex A modulation type.
Workaround: There is no work around.
CMTS-Voice
•
CSCsr59753
Symptom: 12.3(23)BC2 mixed docsis mode (atdma-tdma) can only achieve 40 UGS for an
upstream. But, 12.3(17b)BC9 can achieve 48 ugs flows.
Conditions: Currently, it looks like this may have something to do with mixed mode and modems.
Workaround: There is no workaround.
CMTS-Wideband
•
CSCsv53276
Symptom: The show controller modular-cable 1/0/0: command shows that rf-channel 0 become
unknown after hw-module reset. SPA IP address = 192.168.5.1
SPA MAC Addr =
0012.001A.67D7 QAM
MOD ANNEX TKB Interval Rate adjust State 0
Unknown
Unknown 0
1
Enabled ====> unknown 1
QAM 256 Annex B 2423
132
Enabled 2
QAM 256 Annex B 2423
132
Enabled 3
QAM
256 Annex B 2423
132
Enabled
Conditions: Happened afte hw-module reset and show diag 1/0/0 This will cause all wideband
modems also go to NB .
Workaround: Reload the router to correct the issue.
•
CSCsv94090
Symptom: When using modem-method load balancing, the docsis 3.0 modems are counted as single
modem PER downstream channel. This results in many D3.0 modems on 1 channel, which means
D2.0 modems will get pushed off, leaving that channel only for bonded traffic (in the case that
Dynamic Bandwidth Sharing is in use, with the SPA channel given 90% remaining ratio for both
types of traffic i.e. best effort). If the D3.0 modem was counted as a single modem on the Bonded
Group of channels i.e. on 3 channels, then they would not influence the movement of D2.0 modems
as the D3.0 modems would appear to be equally spread across the SPA channels.
Conditions: D3.0 Modem with 12.3(23)BC5. Load Balance is enabled.
Workaround: There is no workaround.
•
CSCsv90935
Symptom: 1. When query for the entPhysicalName output there is a mismatch in the SFP output
for12.3BC and 12.2SC images. 2. The WB SPA showed twice when running the show
inventorycommand.
Conditions: When there are WB SPA cards working on sip, use the show inventory command or
query for the entPhysicalName, the Symptom happens. This Symptom does not affect other
functions of the WB SPA card.
Workaround: This a cosmetic mismatch of the SFP output string. Be aware that the output string is
different between 12.3(21)BC and 12.2(33)SCA
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-176
Chapter 2
Caveat List for Cisco IOS Release 12.2(33)SCB
Resolved Caveats — Cisco IOS Release 12.2(33)SCB
The resolved caveats are grouped based on their component types.
CMTS-Application
•
CSCsv29206
Symptom: Executing the show interface x/y/z modem 0 command may show duplicate MAC
entries.
Workaround: There is no workaround.
•
CSCsw46178
Symptom: While configuring a modular cable interface on cable SPA 3/3/0, there is a memory
corruption on the mac-domain host line card. This eventually causes the mac-domain host line card
to crash. If line card HA is configured then after the line card crash, an HA switchover to the Protect
LC is triggered, and the Protect LC will now start to crash.
Condition: Cable SPA is in Slot 3, bay 3 and default multicast QOS is configured on the CMTS.
Workaround: 1. Do not use slot 3 and bay 3 for cable SPA or 2. Do not configure multicast QoS on
the CMTS (including multicast QoS related to DSG).
•
CSCsw30738
Symptom:IGMP query messages are not fowarded to the multicast client from CMTS when modems
are registered in modular interface with TLS. Due to this packets are not received in the client end.
Conditions:TLS and Multicast
Workaround:There is no issue with legacy setup.
•
CSCsw25116
Symptom:TLS data traffic either stops or is forwarded unencrypted after OIR of cable line card.
Conditions: TLS is provisioned on a CM with Modular Cable primary downstream and the Modular
host is on a different line card than the MAC-domain host interface of the CM.
Workaround: Configure Modular host on the same line card as the MAC-domain host interface of
the TLS provisioned CM.
CMTS-Platform
•
CSCsm87471
Symptom: UBR10-MC5X20H line card is crashing by breakpoint exception. Error message reported
in the crashinfo file is the following : cr10k_clc_pre_poll: IPC not up. Reloading Line Card..
Conditions: This occurs on uBR10k running 12.3(21a)BCx or 12.3(23)BC.
Conditions: This occurs on uBR10k running 12.3(21a)BCx or 12.3(23)BC When the standby PRE
in eboot state, it's easier to see this bug.
Workaround: If this bug is generated by standby PRE in eboot state, the workaround is : a. Using
the eboot image c10k2-eboot-mz.122-16.BX b. Don't keep standby PRE in eboot state, at least
should not keep it in eboot for a long time. As to 12.2S image, we didn't see this problem so far.
Sometimes, the continous CLI commands in test script may also lead to this problem. It's better to
add some "sleep" between CLI commands.
Workaround: None.
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-177
Chapter 2
Release Notes for Cisco IOS Release 12.2(33)SCH for Cisco uBR10012 Routers
2-178
Caveat List for Cisco IOS Release 12.2(33)SCB