Configuring a traffic class-to-CoS mutation map

Enter global configuration mode.
```
device# configure terminal
```

Configure the QoS traffic class-to-CoS mutation map.

device(config)# qos map traffic-class-cos CoSMap
SLX(traffic-class-cos-CoSMap)# map traffic-class 0 to cos 1
SLX(traffic-class-cos-CoSMap)# map traffic-class 5 to cos 4
SLX(traffic-class-cos-CoSMap)# map traffic-class 6 to cos 4
SLX(traffic-class-cos-CoSMap)# map traffic-class 7 to cos 3

If the QoS CoS mutation map is not configured, then the default CoS mutation map is used with 1:1 mapping for the traffic class-to-PCP values.

Return to privileged exec mode.
```
device(config)# exit
```

Verify the configuration.

device# show qos maps traffic-class-cos  

Traffic Class-to-Cos Mutation map 'CoSMap'
   TrafficClass: 0  1  2  3  4  5  6  7
   ------------------------------------
   Out-Cos: 1  1  2  3  4  4  4  3

   Enabled on the following interfaces:

Save the running-config file to the startup-config file.
```
device# copy running-config startup-config
```

Traffic class-to-CoS mutation map configuration example

device# configure terminal
device(config)# qos map traffic-class-cos CoSMap 3 
device(traffic-class-cos-CoSMap)# map traffic-class 0 to cos 1 4 
device(traffic-class-cos-CoSMap)# map traffic-class 5 to cos 4 5 
device(traffic-class-cos-CoSMap)# map traffic-class 6 to cos 4 6 
device(traffic-class-cos-CoSMap)# map traffic-class 7 to cos
device(config)# exit
device# show qos maps traffic-class-cos 
device# copy running-config startup-config