Applying a DSCP-to-traffic class and drop precedence mutation map to an interface

A QoS DSCP-to-traffic class and drop precedence mutation map has been configured

The ingress DSCP value can be used to classify traffic in to a specific traffic class and drop precedence by applying a DSCP-to-traffic class and drop precedence mutation map on the ingress interface.

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

Enter interface configuration mode.

device(config)# interface ethernet 0/2

Enable the QoS DSCP-to-traffic class and drop precedence mutation map on the interface.
```
device(conf-if-eth-0/2)# qos dscp-traffic-class dscpTcDpMap  
```
Return to privileged exec mode.
```
device(conf-if-eth-0/2)# end
```

Verify the configuration

device# show qos maps dscp-traffic-class dscpTcDpMap
DSCP-to-TC Map: dscpTc (x/y: TC = x, DP = y, DSCP = d1d2)
    d1 :  d2  0   1   2   3   4   5   6   7   8   9 
    ------------------------------------------------
     0 :     0/0 0/0 0/0 0/0 0/0 0/0 0/0 0/0 1/0 1/0
     1 :     1/0 1/0 1/0 1/0 1/0 1/0 2/0 2/0 2/0 2/0
     2 :     2/0 2/0 2/0 2/0 3/0 3/0 3/0 3/0 3/0 3/0
     3 :     3/0 3/0 4/0 4/0 4/0 4/0 4/0 4/0 4/0 4/0
     4 :     5/0 5/0 5/0 5/0 5/0 5/0 5/0 5/0 6/0 6/0
     5 :     6/0 6/0 6/0 6/0 6/0 6/0 7/0 7/0 7/0 7/0
     6 :     7/0 7/0 7/0 7/0

    Enabled on the following interfaces: Eth 0/2

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

Apply a QoS DSCP-to-traffic class map to an interface configuration example

device# configure terminal
device(config)# interface ethernet 0/2 
device(conf-if-eth-0/2)# qos dscp-traffic-class dscpTcDpMap  
device(conf-if-eth-0/2)# end
device# show qos maps dscp-traffic-class dscpTcDpMap
device# copy running-config startup-config