Cisco Catalyst 3550 series Software Configuration Manual page 642

Configuring Standard QoS
Command
Step 5 mls qos dscp-mutation
dscp-mutation-name
Step 6
end
Step 7 show mls qos maps dscp-mutation
Step 8 copy running-config startup-config
To return to the default map, use the no mls qos map dscp-mutation dscp-mutation-name global
configuration command.
This example shows how to define the DSCP-to-DSCP-mutation map. All the entries that are not
explicitly configured are not modified (remain as specified in the null map):
Switch# configure terminal
Switch(config)# mls qos map dscp-mutation mutation1 1 2 3 4 5 6 7 to 0
Switch(config)# mls qos map dscp-mutation mutation1 8 9 10 11 12 13 to 10
Switch(config)# mls qos map dscp-mutation mutation1 20 21 22 to 20
Switch(config)# mls qos map dscp-mutation mutation1 30 31 32 33 34 to 30
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos trust dscp
Switch(config-if)# mls qos dscp-mutation mutation1
Switch(config-if)# end
Switch# show mls qos maps dscp-mutation mutation1
Dscp-dscp mutation map:
mutation1:
In this DSCP-to-DSCP-mutation map, the mutated values are shown in the body of the matrix. The d1
Note
column specifies the most-significant digit of the original DSCP; the d2 row specifies the
least-significant digit of the original DSCP. The intersection of the d1 and d2 values gives the mutated
value. For example, a DSCP value of 12 corresponds to a mutated value of 10.
Catalyst 3550 Multilayer Switch Software Configuration Guide
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d1 : d2 0 1 2 3 4
---------------------------------------
0 : 00 00 00 00 00 00 00 00 10 10
1 : 10 10 10 10 14 15 16 17 18 19
2 : 20 20 20 23 24 25 26 27 28 29
3 : 30 30 30 30 30 35 36 37 38 39
4 : 40 41 42 43 44 45 46 47 48 49
5 : 50 51 52 53 54 55 56 57 58 59
6 : 60 61 62 63
Purpose
Apply the map to the specified ingress DSCP-trusted port.
For dscp-mutation-name, enter the mutation map name specified in
Step 2.
You can apply the map to different Gigabit-capable Ethernet ports.
However, on 10/100 Ethernet ports, you can attach only one
DSCP-to-DSCP-mutation map to a group of twelve ports. For example,
Fast Ethernet ports 0/1 to 0/12 are a group, Fast Ethernet ports 0/13 to
0/24 are a group, Gigabit Ethernet port 0/1 is a group, and Gigabit
Ethernet port 0/2 is a group. When applying a mutation map to any port
in a group, all ports in the same group are automatically configured
with the same map.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
5 6 7 8 9
Chapter 29 Configuring QoS
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