QoS: Match ATM OAM
The QoS: Match ATM Operation, Administration, and Maintenance (OAM) feature distinguishes control
traffic from data traffic so that the control traffic can be protected from being dropped during interface
congestion. Control traffic consists of router-generated ATM OAM protocol packets, used to manage the
link status. Data traffic is the network-applications-generated packets, usually from network users. By
using Modular Quality of Service (QoS) Command-Line Interface (CLI) (MQC) with this feature, you
can label the control traffic as high priority when it travels through a Layer 2 Virtual Private Network
(L2VPN) tunnel.
Feature History for QoS: Match ATM OAM
Release
Modification
12.0(30)S
This feature was introduced.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image
support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on
Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at
the login dialog box and follow the instructions that appear.
Contents
•
Prerequisites for QoS: Match ATM OAM, page 2
•
Restrictions for QoS: Match ATM OAM, page 2
•
Information About QoS: Match ATM OAM, page 2
•
How to Configure QoS: Match ATM OAM, page 4
•
Configuration Examples for QoS: Match ATM OAM, page 12
•
Additional References, page 15
•
Command Reference, page 17
•
Glossary, page 19
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Copyright © 2004 Cisco Systems, Inc. All rights reserved.
QoS: Match ATM OAM
Prerequisites for QoS: Match ATM OAM
Prerequisites for QoS: Match ATM OAM
Ensure that an ATM interface is configured in the network.
Restrictions for QoS: Match ATM OAM
The following restrictions apply to the QoS: Match ATM OAM feature:
Note
•
It is supported on an ATM interface only.
•
It is available in MQC classification only.
•
It is supported on Cisco 12000 Series Routers only.
We recommend that you attach policy maps to the ATM interfaces in an input direction only.
Information About QoS: Match ATM OAM
To use the QoS: Match ATM OAM feature, you should understand the following concepts:
•
Feature Overview, page 2
•
Matching Packets Using MQC, page 3
•
Benefits, page 3
Feature Overview
When you enable the QoS: Match ATM OAM feature on an interface, you can match packets on the basis
of ATM OAM, and then apply the QoS functionality to those packets.
Control traffic (such as OAM, Interim Local Management Interface [ILMI], Bridge Protocol Data Unit
[BPDU]) is not protected from data traffic when the interface is congested. Interface congestion may
cause the management packets to be dropped.
The link status is highly dependent on the management packets. The correct link status cannot be
maintained on the interface if the management packets are dropped due to interface congestion. In an
L2VPN framework, some of the management packets are carried from customer edge (CE) router to CE
router for the virtual tunnel link status and the packets need higher priority when they are traveling in
the tunnel.
Figure 1 shows a sample topology for QoS: Match ATM OAM.
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Information About QoS: Match ATM OAM
Figure 1
Sample Topology for QoS: Match ATM OAM
ATM
R1 (CE)
ATM
R2 (PE)
R3 (PE)
R4 (CE)
121811
R1, R2, R3, R4 = Router
CE = Customer Edge Router
PE = Provider Edge Router
ATM = Asynchronous Transfer Mode Interface
Matching Packets Using MQC
To configure the QoS: Match ATM OAM feature, you must define a traffic class, configure a policy map,
and then attach that policy map to the appropriate interface. These three tasks can be accomplished by
using MQC.
The MQC is a command-line interface that allows you to define traffic classes, create and configure
traffic policies (policy maps), and then attach these traffic policies to interfaces.
The MQC consists of the following three processes:
•
Defining a traffic class with the class-map command
•
Creating a traffic policy by associating the traffic class with one or more QoS features by using the
policy-map command
•
Attaching the traffic policy to the interface with the service-policy command
A traffic class contains three major elements: a name, a series of match commands, and, if more than
one match command exists in the traffic class, instructions on how to evaluate these match commands
(that is, match-all or match-any). The traffic class is named in the class-map command line; for example,
if you enter the class-map cisco command while configuring the traffic class in the CLI, the traffic class
would be named "cisco".
The match commands are used to specify various criteria for classifying packets. Packets are checked
to determine whether they match the criteria specified in the match commands. If a packet matches the
specified criteria, that packet is considered a member of the class and is forwarded according to the QoS
specifications set in the traffic policy. Packets that fail to meet any of the matching criteria are classified
as members of the default traffic class.
Benefits
The QoS: Match ATM OAM feature provides the following benefits:
•
Allows you to protect the control traffic during interface congestion by using MQC.
•
Provides a way to distinguish the control traffic from the data traffic on an ATM interface.
•
Allows you to label the control traffic as high priority when it travels in an L2VPN tunnel.
•
Allows you to configure policing, which excludes OAM traffic.
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How to Configure QoS: Match ATM OAM
How to Configure QoS: Match ATM OAM
This section contains the following procedures:
•
Configuring a Class Map, page 4 (required)
•
Configuring Ingress Policing, page 5 (required)
•
Creating a Policy Map, page 7 (required)
•
Attaching the Policy Map to an Interface or a VC, page 9 (required)
•
Verifying the Attached Class Map, page 10 (optional)
•
Verifying the Policy Map, page 11 (optional)
•
Verifying the Configuration, page 11 (optional)
Configuring a Class Map
Perform the following task to configure a class map to match packets on an ATM interface.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
class-map class-map-name
4.
match atm oam
5.
exit
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How to Configure QoS: Match ATM OAM
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
class-map class-map-name
Specifies the name of the class map to be created and enters
class-map configuration mode.
Example:
Router(config)# class-map class_oam
Step 4
Enables packet matching on the basis of the ATM OAM.
match atm oam
Example:
Router(config-cmap)# match atm oam
Step 5
(Optional) Exits class-map configuration mode.
exit
Example:
Router(config-cmap)# exit
Configuring Ingress Policing
Perform the following task to configure ingress policing on a L2VPN tunnel.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
class-map class-map-name
4.
match not atm oam
5.
exit
6.
policy-map policy-map-name
7.
class {class-name | class-default}
8.
police rate pcr cps delay-tolerance cdvt conform-action action exceed-action action
violate-action action
9.
exit
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How to Configure QoS: Match ATM OAM
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
class-map class-map-name
Specifies the name of the class map to be created and enters
class-map configuration mode.
Example:
Router(config)# class-map not_oam
Step 4
match not atm oam
Enables packet matching on the basis of excluding OAM.
Example:
Router(config-cmap)# match not atm oam
Step 5
Exits class-map configuration mode.
exit
Example:
Router(config-cmap)# exit
Step 6
policy-map policy-map-name
Example:
Router(config)# policy-map oam_policy
Step 7
class {class-name | class-default}
Example:
Router(config-pmap)# class not_oam
Creates or modifies a policy map that can be attached to one
or more interfaces to specify a service policy. Enters
policy-map configuration mode.
•
Specifies the name of the class whose policy you want to
create or change or specifies the default class before you
configure its policy. Enters policy-map class configuration
mode.
•
Step 8
police rate pcr cps delay-tolerance cdvt
conform-action action exceed-action action
violate-action action
Enter the policy map name.
Enter the class-name argument or enter the
class-default keyword.
Specifies a maximum rate usage by a traffic class through
the use of a generic cell rate algorithm.
Example:
Router(config-pmap-c)# police rate 1000 cps
delay tolerance 1000 conform transmit exceed
set-mpls-exp 3
Step 9
(Optional) Exits policy-map class configuration mode.
exit
Example:
Router(config-pmap-c)# exit
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How to Configure QoS: Match ATM OAM
Creating a Policy Map
Perform the following task to create a policy map.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
policy-map policy-map-name
4.
class {class-name | class-default}
5.
set mpls experimental imposition {mpls-exp-value}
6.
exit
7.
class {class-name | class-default}
8.
set mpls experimental imposition {mpls-exp-value}
9.
exit
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
policy-map policy-map-name
Example:
Router(config)# policy-map policy_oam
Step 4
class {class-name | class-default}
Example:
Router(config-pmap)# class class_oam
Step 5
set mpls experimental imposition
{mpls-exp-value}
Creates or modifies a policy map that can be attached to one
or more interfaces to specify a service policy. Enters
policy-map configuration mode.
•
Enter the policy map name.
Specifies the name of the class whose policy you want to
create or change. Enters policy-map class configuration
mode.
•
Enter the class-name argument or the class-default
keyword.
Sets the MPLS EXP value for the bits used to define the
policy map.
Example:
Router(config-pmap-c)# set mpls experimental
imposition 5
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How to Configure QoS: Match ATM OAM
Step 6
Command or Action
Purpose
exit
Exits policy-map class configuration mode.
Example:
Router(config-pmap-c)# exit
Step 7
class {class-name | class-default}
Specifies the default class before you configure its policy.
Enters policy-map class configuration mode.
Example:
Router(config-pmap)# class class_default
Step 8
set mpls experimental imposition
{mpls-exp-value}
Sets the MPLS EXP value of the bits used to define the
default traffic.
Example:
Router(config-pmap-c)# set mpls experimental
imposition 4
Step 9
(Optional) Exits policy-map class configuration mode.
exit
Example:
Router(config-pmap-c)# exit
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How to Configure QoS: Match ATM OAM
Attaching the Policy Map to an Interface or a VC
Perform the following task to attach the policy map to an interface or a virtual circuit (VC).
Restrictions
This feature supports only policy maps attached to an ATM interface in the input direction.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface type number [name-tag]
4.
pvc [name] vpi | vci [ilmi | qsaal | smds]
5.
service-policy {input} policy-map-name
6.
exit
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
interface type number [name-tag]
Example:
Configures the interface type specified and enters interface
configuration mode.
•
Enter interface type.
Router(config)# interface atm 0/0
Step 4
pvc [name] vpi|vci [ilmi|qsaal|smds]
Example:
Creates or assigns a name to an ATM PVC, specifies the
encapsulation type on an ATM PVC, and enters ATM virtual
circuit configuration mode.
Router(config-if)# pvc 0/60 l2transport
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How to Configure QoS: Match ATM OAM
Step 5
Command or Action
Purpose
service-policy {input} policy-map-name
Specifies the name of the policy map to be attached to the
input direction of the interface.
Example:
Note
Router(config-if-atm-l2trans-pvc)#
service-policy input policy_oam
•
Step 6
Policy maps can be configured on ingress or egress
routers. They can also be attached in the input or
output direction of an interface. The direction (input
or output) and the router (ingress or egress) to which
the policy map should be attached varies according
your network configuration. For this feature, only
the input direction is supported.
Enter the input keyword followed by the policy map
name.
(Optional) Exits ATM virtual circuit mode.
exit
Example:
Router(config-if-atm-l2trans-pvc)# exit
Verifying the Attached Class Map
Perform the following task to verify the class maps and their matching criteria on an ATM interface.
SUMMARY STEPS
1.
enable
2.
show class-map
3.
exit
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
show class-map
Displays all class maps and their matching criteria.
Example:
Router# show class-map
Step 3
(Optional) Exits privileged EXEC mode.
exit
Example:
Router# exit
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How to Configure QoS: Match ATM OAM
Verifying the Policy Map
Perform the following task to verify the policy maps attached on an ATM interface.
SUMMARY STEPS
1.
enable
2.
show policy-map policy-map-name
3.
exit
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
show policy-map policy-map-name
Example:
Router# show policy-map oam
Displays the packet statistics of all classes that are
configured for all service policies either on the specified
interface or subinterface or on a specific PVC on the
interface.
•
Step 3
Enter the interface name.
(Optional) Exits privileged EXEC mode.
exit
Example:
Router# exit
Verifying the Configuration
Perform the following task to verify that the packets of the specified class are being matched and to
display the number of matched packets.
SUMMARY STEPS
1.
enable
2.
show policy-map interface [{interface interface-number} | {null interface-number} | {vlan
vlan-id}] [input | output]
3.
exit
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Configuration Examples for QoS: Match ATM OAM
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
show policy-map interface [{interface
interface-number} | {null interface-number} |
{vlan vlan-id}] [input | output]
Displays the statistics and the configurations of the input
and output policies that are attached to an interface.
Example:
Router# show policy-map interface atm 3/3
Step 3
(Optional) Exits privileged EXEC mode.
exit
Example:
Router# exit
Configuration Examples for QoS: Match ATM OAM
This section contains the following configuration examples:
•
Configuring the QoS: Match ATM OAM Feature: Example, page 12
•
Configuring Ingress Policing on L2VPN Tunnels, page 13
•
Verifying the QoS: Match on ATM OAM Feature: Example, page 13
Configuring the QoS: Match ATM OAM Feature: Example
There are three tasks for configuring this feature:
•
Configuring a class map
•
Creating a policy map
•
Attaching the policy map to an interface
In the following example, a class map called class_oam is configured to match packets on an ATM
interface.
Router# configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
Router(config)# class-map class_oam
Router(config-cmap)# match atm oam
Router(config-cmap)# exit
In the following example, a policy map called policy_oam is created by using the policy-map command.
Use policy maps to apply one or more QoS features to the packets in your network.
Router# configure terminal
Enter configuration commands, one per line.
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QoS: Match ATM OAM
Configuration Examples for QoS: Match ATM OAM
Router(config)# policy-map policy_oam
Router(config-pmap)# class class-oam
Router(config-pmap-c)# set mpls experiment imposition 5
Router(config-pmap-c)# exit
Router(config-pmap)# class class-default
Router(config-pmap-c)# set mpls experiment imposition 4
Router(config-pmap-c)# exit
In the following example, the policy map called policy_oam is attached to an ATM interface by using
the service-policy command.
You can attach policy maps to an ATM interface in both directions; however, this feature supports them
in the input direction only. Therefore, specify the input keyword when you issue the service-policy
command.
Router# configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
Router(config)# interface atm 0/0
Router(config-if)# pvc 0/60 l2transport
Router(config-if-atm-l2trans-pvc)# service-policy input policy_oam
Router(config-if-atm-l2trans-pvc)# exit
Configuring Ingress Policing on L2VPN Tunnels
In the following example, ingress policing is configured on L2VPN circuits by using the match not
atm oam command and policy-map oam_policy command.
Note
When you configure ingress policing on L2VPN circuits, you can exclude OAM traffic from being
policed so that it will not be dropped if the rate on the VC exceeds the peak rate.
Router# configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
Router(config)# class-map not_oam
Router(config-cmap)# match not atm oam
Router(config-cmap)# exit
Router(config)# policy-map oam_policy
Router(config-pmap)# class not_oam
Router(config-pmap-c)# police rate 1000 cps delay tolerance 1000 conform transmit exceed
set-mpls-exp 3
Router(config-pmap-c)# exit
Verifying the QoS: Match on ATM OAM Feature: Example
In the following example, the configuration of ATM OAM is verified using the show class-map
command and the show policy-map interface command.
Use the output from the show class-map command to verify all class maps and their matching criteria.
Router# show class-map
Class Map match-any class-default (id 0)
Match any
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Configuration Examples for QoS: Match ATM OAM
Class Map match-all ccc (id 1)
Match atm oam
Class Map match-all c (id 2)
Match none
Use the output from the show policy-map command to verify all policy maps on your network.
Router# show policy-map oam
Policy Map oam
Class oam
set mpls experimental imposition 5
Class class-default
set mpls experimental imposition 4
Use the output from the show policy-map interface command to verify and monitor the configuration
on your network.
Router# show policy-map interface atm 3/3
ATM3/3: VC 7/100 Service-policy input: oam (1072)
Class-map: oam (match-all) (1073/2)
104 packets, 5512 bytes
5 minute offered rate 93 bps, drop rate 0 bps
Match: atm oam (1074)
Set Policy:
set mpls experimental imposition 5
Class-map: class-default (match-any) (1076/0)
516 packets, 27348 bytes
5 minute offered rate 181 bps, drop rate 0 bps
Match: any (1077)
Set Policy:
set mpls experimental imposition 4
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Additional References
Additional References
The following sections provide references related to the QoS: Match ATM OAM feature.
Related Documents
Related Topic
Document Title
QoS commands: complete command syntax, command Cisco IOS Quality of Service Solutions Command Reference,
modes, command history, defaults, usage guidelines,
Release 12.3 T
and examples
MQC
Cisco IOS Quality of Service Solutions Configuration Guide,
Release 12.3
Standards
Standards
Title
No new or modified standards are supported by this
—
feature, and support for existing standards has not been
modified by this feature.
MIBs
MIBs
MIBs Link
No new or modified MIBs are supported by this
feature, and support for existing MIBs has not been
modified by this feature.
To locate and download MIBs for selected platforms, Cisco IOS
releases, and feature sets, use Cisco MIB Locator found at the
following URL:
http://www.cisco.com/go/mibs
RFCs
RFCs
Title
No new or modified RFCs are supported by this
feature, and support for existing RFCs has not been
modified by this feature.
—
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Additional References
Technical Assistance
Description
Link
Technical Assistance Center (TAC) home page,
containing 30,000 pages of searchable technical
content, including links to products, technologies,
solutions, technical tips, and tools. Registered
Cisco.com users can log in from this page to access
even more content.
http://www.cisco.com/public/support/tac/home.shtml
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Command Reference
Command Reference
This section documents a new command. All other commands used with this feature are documented in
the Cisco IOS Release 12.3 command reference publications.
•
match atm oam
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match atm oam
match atm oam
To enable the control traffic classification on an ATM interface, use the match atm oam command in
class-map configuration mode. To disable the control traffic classification, use the no form of this
command.
match atm oam
no match atm oam
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values
Command Modes
Class-map configuration
Command History
Release
Modification
12.0(30)S
This command was introduced.
Usage Guidelines
Use this command for policy maps attached to ATM interfaces or ATM permanent virtual circuits
(PVCs). Policy maps containing the match atm oam command attached to ATM interfaces or ATM
PVCs can be input policy maps only.
Examples
The following example shows the control traffic classification being configured as the match criterion
in a class map. The policy map containing this class map is then applied to the ATM interface.
Router# configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
Router(config)# class-map class-oam
Router(config-cmap)# match atm oam
Router(config-cmap)# exit
Related Commands
Command
Description
show class-map
Displays all class maps and their matching criteria.
show policy-map
Displays all policy maps.
show policy-map
interface
Displays the packet statistics of all classes that are configured for all service
policies either on the specified ATM interface or on a specific PVC on the
interface.
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Glossary
Glossary
ATM—Asynchronous Transfer Mode. The international standard for cell relay in which multiple service
types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells
allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take
advantage of high-speed transmission media, such as E3, SONET, and T3.
BPDU—Bridge Protocol Data Unit. A Spanning-Tree Protocol hello packet that is sent out at
configurable intervals to exchange information among bridges in the network.
CE router—customer edge router. A router that is part of a customer network and that interfaces to a
provider edge (PE) router.
control traffic—Router-generated protocol packets, such as ATM OAM, that are used to manage link
status.
data traffic—Packets generated by network applications.
ILMI—Interim Local Management Interface. A specification developed by the ATM Forum for
incorporating network-management capabilities into the ATM User-Network Interface (UNI).
MQC—Modular Quality of Service (QoS) Command-Line Interface (CLI).
OAM—Operation, Administration, and Maintenance. An ATM Forum specification for cells used to
monitor virtual circuits. OAM cells provide a virtual circuit-level loopback in which a router responds
to the cells, demonstrating that the circuit is up and the router is operational.
PE router—provider edge router. A router that is part of a service provider's network and is connected
to a customer edge (CE) router.
PVC—permanent virtual circuit (or connection). A virtual circuit that is permanently established. PVCs
save bandwidth associated with circuit establishment and teardown in situations where certain virtual
circuits must exist all the time. In ATM terminology, called a permanent virtual connection.
VPN—Virtual Private Network. Enables IP traffic to travel securely over a public TCP/IP network by
encrypting all traffic from one network to another. A VPN uses "tunneling" to encrypt all information at
the IP level.
Note
Refer to Internetworking Terms and Acronyms for terms not included in this glossary.
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Glossary
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