Cisco MWR 2941 Installation Manual download pdf (Page 412)

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR

OL-26895-01

Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR

set cos

The match cos and set cos commands can be used together to allow routers and switches to interoperate

and provide quality of service (QoS) based on the CoS markings.

Layer 2 to Layer 3 mapping can be configured by matching on the CoS value because switches already

can match and set CoS values. If a packet that needs to be marked to differentiate user-defined QoS

services is leaving a router and entering a switch, the router should set the CoS value of the packet

because the switch can process the Layer 2 header.

Using This Command with the Enhanced Packet Marking Feature

You can use this command as part of the Enhanced Packet Marking feature to specify the “from-field”

packet-marking category to be used for mapping and setting the CoS value. The “from-field”

packet-marking categories are as follows:

• Precedence

• Differentiated services code point (DSCP)

If you specify a “from-field” category but do not specify the table keyword and the applicable

table-map-name argument, the default action will be to copy the value associated with the “from-field”

category as the CoS value. For instance, if you configure the set cos precedence command, the

precedence value will be copied and used as the CoS value.

You can do the same for the DSCP marking category. That is, you can configure the set cos dscp

command, and the DSCP value will be copied and used as the CoS value.

Note If you configure the set cos dscp command, only the first three bits (the class selector bits) of the DSCP

field are used.

Examples In the following example, the policy map called “cos-set” is created to assign different CoS values for

different types of traffic. This example assumes that the class maps called “voice” and “video-data” have

already been created.

Router(config)# policy-map cos-set

Router(config-pmap)# class voice

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

Router(config-pmap-c)# exit

Router(config-pmap)# class video-data

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

Router(config-pmap-c)# end

Enhanced Packet Marking Example

In the following example, the policy map called “policy-cos” is created to use the values defined in a

table map called “table-map1”. The table map called “table-map1” was created earlier with the

table-map (value mapping) command. For more information about the table-map (value mapping)

command, see the table-map (value mapping) command page.

In this example, the setting of the CoS value is based on the precedence value defined in “table-map1”:

Router(config)# policy-map policy-cos

Router(config-pmap)# class class-default

Router(config-pmap-c)# set cos precedence table table-map1

Router(config-pmap-c)# end

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