Qos Map Dscp - Cisco 4500M Command Reference Manual

qos map dscp

qos map dscp
To map DSCP values to selected transmit queues and to map the DSCP-to-CoS value, use the qos map
dscp command. To return to the default value, use the no form of this command.
Syntax Description
dscp-values
to
tx-queue
queue-id
cos
cos-value
Defaults
The default DSCP-to-CoS configuration settings are shown in the following table:
DSCP
CoS
Command Modes
Global configuration
Command History Release
12.1(8a)EW
Usage Guidelines
You use the DSCP-to-CoS map to map the final DSCP classification to a final CoS. The CoS map is
written into the ISL header or 802.1Q tag of the transmitted packet on trunk interfaces and contains a
table of 64DSCP values and the corresponding CoS values. The switch has one map. You can enter up
to eight DSCP values, separated by spaces, for a CoS value.
The DSCP-to-transmit-queue map is used to map the final DSCP classification to a transmit queue. You
can enter up to eight DSCP values, separated by spaces, for a transmit queue.
Examples
This example shows how to configure the egress DSCP-to-CoS mapping:
Switch(config)# qos map dscp 20 25 to cos 3
Switch(config)#
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
2-220
qos map dscp dscp-values to tx-queue queue-id
no qos map dscp dscp-values to cos cos-value
List of DSCP values to map to the queue ID; valid values are from 0 to 63.
Defines mapping.
Specifies a transmit queue.
Transmit queue; valid values are from 1 to 4.
Specifies the CoS value.
Class of service; valid values are from 1 to 7.
0-7 8-15 16-23 24-31 32-39 40-47 48-55 56-63
0 1 2 3
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
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