Class-Based Ethernet CoS Matching and Marking

The Class-Based Ethernet CoS Matching and Marking (801.1p and ISL CoS) feature allows you to mark and match packets using Class of Service (CoS) values.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for Class-Based Ethernet CoS Matching and Marking

When configuring this feature, you must first create a policy map (sometimes referred to as a service policy or a traffic policy) using the Modular QoS Command-Line Interface (CLI) (MQC). Therefore, you should be familiar with the procedure for creating a policy map using the MQC.

For more information about creating a policy map (traffic policy) using the MQC, see the “Applying QoS Features Using the MQC” module.

Information About Class-Based Ethernet CoS Matching and Marking

Layer 2 CoS Values

Layer 2 (L2) Class of Service (CoS) values are relevant for IEEE 802.1Q and Interswitch Link (ISL) types of frames. The Class-based Ethernet CoS Matching and Marking feature extends Cisco software capabilities to match packets by looking at the CoS value of the packet and marking packets with user-defined CoS values. This feature can be used for L2 CoS to L3 Terms of Service (TOS) mapping. CoS matching and marking can be configured via the Cisco Modular QoS CLI framework.

How to Configure Class-Based Ethernet CoS Matching and Marking

Configuring Class-Based Ethernet CoS Matching

In the following task, classes named voice and video-and-data are created to classify traffic based on the CoS values. The classes are configured in the CoS-based-treatment policy map, and the service policy is attached to all packets leaving Gigabit Ethernet interface 1/0/1.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. class-map class-map-name
  4. match cos cos-value
  5. exit
  6. class-map class-map-name
  7. match cos cos-value
  8. exit
  9. policy-map policy-map-name
  10. class {class-name | class-default }
  11. priority level level
  12. exit
  13. class {class-name | class-default }
  14. bandwidth remaining percent percentage
  15. exit
  16. exit
  17. interface type number
  18. service-policy {input | output } policy-map-name
  19. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

class-map class-map-name

Example:


Device(config)# class-map voice

Specifies the name of the class map to be created and enters class-map configuration mode.

Step 4

match cos cos-value

Example:


Device(config-cmap)# match cos 7

Configures the class map to match traffic on the basis of the CoS value.

Step 5

exit

Example:


Device(config-cmap)# exit

(Optional) Exits class-map configuration mode.

Step 6

class-map class-map-name

Example:


Device(config)# class-map video-and-data

Specifies the name of the class map to be created and enters class-map configuration mode.

  • Enter the class map name.

Step 7

match cos cos-value

Example:


Device(config-cmap)# match cos 5

Configures the class map to match traffic on the basis of the CoS value.

Step 8

exit

Example:


Device(config-cmap)# exit

(Optional) Exits class-map configuration mode.

Step 9

policy-map policy-map-name

Example:


Device(config)# policy-map cos-based-treatment

Specifies the name of the policy map created earlier and enters policy-map configuration mode.

Step 10

class {class-name | class-default }

Example:


Device(config-pmap)# class voice

Specifies the name of the class whose policy you want to create and enters policy-map class configuration mode. This class is associated with the class map created earlier.

Step 11

priority level level

Example:

Device(config-pmap-c)# priority level 1

Specifies the level of the priority service.

Step 12

exit

Example:


Device(config-pmap-c)# exit

(Optional) Exits policy-map class configuration mode.

Step 13

class {class-name | class-default }

Example:


Device(config-pmap)# class video-and-data

Specifies the name of the class whose policy you want to create and enters policy-map class configuration mode. This class is associated with the class map created earlier.

Step 14

bandwidth remaining percent percentage

Example:

Device(config-pmap-c)# bandwidth remaining percent 20

Specifies the amount of bandwidth assigned to the class.

Step 15

exit

Example:


Device(config-pmap-c)# exit

(Optional) Exits policy-map class configuration mode.

Step 16

exit

Example:


Device(config-pmap)# exit

(Optional) Exits policy-map configuration mode.

Step 17

interface type number

Example:


Device(config)# interface gigabitethernet 1/0/1

Configures an interface (or subinterface) type and enters interface configuration mode.

Step 18

service-policy {input | output } policy-map-name

Example:


Device(config-if)# service-policy output cos-based-treatment

Specifies the name of the policy map to be attached to either the input or output direction of the interface.

Note 

Policy maps can be configured on ingress or egress devices. They can also be attached in the input or output direction of an interface. The direction (input or output) and the device (ingress or egress) to which the policy map should be attached vary according your network configuration. When using the service-policy command to attach the policy map to an interface, be sure to choose the device and the interface direction that are appropriate for your network configuration.

Step 19

end

Example:


Device(config-if)# end

(Optional) Exits interface configuration mode and returns to privileged EXEC mode.

Configuring Class-Based Ethernet CoS Marking

In the following task, the policy map called cos-set is created to assign different CoS values for different types of traffic.


Note

This task assumes that the class maps called voice and video-and-data have already been created.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. policy-map policy-map-name
  4. class {class-name | class-default }
  5. set cos cos-value
  6. exit
  7. class {class-name | class-default }
  8. set cos cos-value
  9. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

policy-map policy-map-name

Example:


Device(config)# policy-map cos-set

Specifies the name of the policy map created earlier and enters policy-map configuration mode.

Step 4

class {class-name | class-default }

Example:


Device(config-pmap)# class voice

Specifies the name of the class whose policy you want to create and enters policy-map class configuration mode. This class is associated with the class map created earlier.

Step 5

set cos cos-value

Example:

Device(config-pmap-c)# set cos 1

Sets the packet’s CoS value.

Step 6

exit

Example:


Device(config-pmap-c)# exit

Exits policy-map class configuration mode.

Step 7

class {class-name | class-default }

Example:


Device(config-pmap)# class video-and-data

Specifies the name of the class whose policy you want to create and enters policy-map class configuration mode. This class is associated with the class map created earlier.

Step 8

set cos cos-value

Example:

Device(config-pmap-c)# set cos 2

Sets the packet’s CoS value.

Step 9

end

Example:


Device(config-pmap-c)# end

(Optional) Exits policy-map class configuration mode and returns to privileged EXEC mode.

Configuration Examples for Class-Based Ethernet CoS Matching and Marking

Example: Configuring Class-Based Ethernet CoS Matching

This example creates two classes, voice and video-and-data, to classify traffic based on the CoS values. The CoS-based-treatment policy map is used to set priority and bandwidth values for the classes. The service policy is attached to all packets leaving interface Gigabit Ethernet1/0/1.


Note

The service policy can be attached to any interface that supports service policies. 


Device(config)# class-map voice
Device(config-cmap)# match cos 7
Device(config-cmap)# exit
Device(config)# class-map video-and-data
Device(config-cmap)# match cos 5
Device(config-cmap)# exit
Device(config)# policy-map cos-based-treatment
Device(config-pmap)# class voice
Device(config-pmap-c)# priority level 1
Device(config-pmap-c)# exit
Device(config-pmap)# class video-and-data
Device(config-pmap-c)# bandwidth remaining percent 20
Device(config-pmap-c)# exit
Device(config-pmap)# exit
Device(config)#  interface gigabitethernet1/0/1
Device(config-if)# service-policy output cos-based-treatment

Example: Class-Based Ethernet CoS Marking

Device(config)# policy-map cos-set
Device(config-pmap)# class voice
Device(config-pmap-c)# set cos 1
Device(config-pmap-c)# exit
Device(config-pmap)# class video-and-data
Device(config-pmap-c)# set cos 2
Device(config-pmap-c)# end

Additional References for Class-Based Ethernet CoS Matching and Marking

Related Documents

Related Topic

Document Title

Cisco commands

Cisco IOS Master Command List, All Releases

QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples

Cisco IOS Quality of Service Solutions Command Reference

Classifying network traffic

“Classifying Network Traffic” module

MQC

“Applying QoS Features Using the MQC” module

Marking network traffic

“Marking Network Traffic” module

Technical Assistance

Description

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http://www.cisco.com/cisco/web/support/index.html

Feature Information for Class-Based Ethernet CoS Matching & Marking

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1. Feature Information for Class-Based Ethernet CoS Matching and Marking

Feature Name

Releases

Feature Information

Class-Based Ethernet CoS Matching and Marking

12.2(5)T

15.0(1)S

Cisco IOS XE Release 2.1

Cisco IOS XE Release 3.2SE

This feature allows you to mark and match packets using Class of Service (CoS) values.

The following commands were introduced or modified: match cos , set cos .

User Priority Based QoS Marking for Wireless Deployments

Cisco IOS XE Release 3.2SE

This features allows you to mark and match packets on wireless deployments using the user-priority (CoS) vlaues.