Cisco ME 3400 Command Reference Manual page 365
Ethernet access switch
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- Software configuration manual (1138 pages) ,
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Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
Usage Guidelines
You can configure set dscp with other marking actions, specifically set cos and set qos-group, for the
same class. Support was also added for the ability to configure more than one marking action with
enhanced packet marking by using table maps for the same class.
You cannot use the set dscp command with the set precedence command to mark the same packet.
DSCP values and IP precedence values are mutually exclusive. A packet can have one value of the other,
but not both.
After DSCP bits are set, other quality of service (QoS) features can then operate on the bit settings.
The network gives priority (or some type of expedited handling) to marked traffic. Typically, you set the
DSCP value at the edge of the network (or administrative domain) and data is then queued according to
the precedence. Class-based weighted fair queuing (CBWFQ) can speed up handling for
high-precedence traffic at congestion points. Weighted Tail Drop (WTD) ensures that high-precedence
traffic has lower loss rates than other traffic during times of congestion.
Instead of using numeric values, you can also specify the dscp-value by using the reserved keywords EF,
AF11, and AF12.
If you are using this command to perform enhanced packet marking, you can use the from-field packet
marking option for mapping and setting the DSCP value. The supported from-field marking categories
are: CoS, DSCP, and IP precedence.
If you specify a from-field category, but do not specify the table keyword and table-map-name, the
default action is to copy the value associated with the from-field category as the DSCP value. For
example, if you enter the set dscp cos command, the CoS value is copied and used as the DSCP value.
Examples
This example shows how to set all FTP traffic to DSCP 10:
Switch(config)# policy-map policy_ftp
Switch(config-pmap)# class ftp_class
Switch(config-pmap-c)# set dscp 10
Switch(config-pmap-c)# exit
This example shows how to assign a CoS to DSCP table map to a class:
Switch(config)# policy-map inpolicy
Switch(config-pmap)# class class-default
Switch(config-pmap-c)# set dscp cos table cos-dscp-tablemap
Switch(config-pmap)# exit
You can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
Command
class
policy-map
show policy-map
OL-9640-07
Description
Defines a traffic classification match criteria for the specified class-map name.
Creates or modifies a policy map that can be attached to multiple ports to
specify a service policy.
Displays QoS policy maps.
Cisco ME 3400 Ethernet Access Switch Command Reference
set dscp
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