Configuring The Dscp-To-Dscp-Mutation Map - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 29 Configuring QoS
This example shows how to map DSCP values 0, 8, 16, 24, 32, 40, 48, and 50 to CoS value 0:
Switch# configure terminal
Switch(config)# mls qos map dscp-cos 0 8 16 24 32 40 48 50 to 0
Switch(config)# end
Switch# show mls qos maps dscp-cos
Dscp-cos map:
Note In this DSCP-to-CoS map, the CoS values are shown in the body of the matrix. The d1 column specifies
the most-significant digit of the DSCP; the d2 row specifies the least-significant digit of the DSCP. The
intersection of the d1 and d2 values gives the CoS value. For example, in the DSCP-to-CoS map, a DSCP
value of 08 corresponds to a CoS value of 0.

Configuring the DSCP-to-DSCP-Mutation Map

You apply the DSCP-to-DSCP-mutation map to a port at the boundary of a QoS administrative domain.
If the two domains have different DSCP definitions between them, use the DSCP-to-DSCP-mutation
map to translate a set of DSCP values to match the definition of the other domain.
The default DSCP-to-DSCP-mutation map is a null map, which maps an incoming DSCP value to the
same DSCP value.
Beginning in privileged EXEC mode, follow these steps to modify the DSCP-to-DSCP-mutation map:
Command
Step 1 configure terminal
Step 2
mls qos map dscp-mutation
dscp-mutation-name in-dscp to out-dscp
Step 3 interface interface-id
Step 4
mls qos trust dscp
78-11194-09
d1 : d2 0 1 2 3 4
---------------------------------------
0 : 00 00 00 00 00 00 00 00 00 01
1 : 01 01 01 01 01 01 00 02 02 02
2 : 02 02 02 02 00 03 03 03 03 03
3 : 03 03 00 04 04 04 04 04 04 04
4 : 00 05 05 05 05 05 05 05 00 06
5 : 00 06 06 06 06 06 07 07 07 07
6 : 07 07 07 07
5 6 7 8 9
Purpose
Enter global configuration mode.
Modify the DSCP-to-DSCP-mutation map.
• For dscp-mutation-name, enter the mutation map name. You can
create more than one map by specifying a new name.
• For in-dscp, enter up to eight DSCP values, with each value
separated by a space. Then enter the to keyword.
• For out-dscp, enter a single DSCP value.
The range is 0 to 63.
Enter interface configuration mode, and specify the interface to which
to attach the map.
Valid interfaces include physical interfaces.
Configure the ingress port as a DSCP-trusted port.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Standard QoS
29-55