Configuring a DSCP-to-traffic class mutation map

  1. Enter global configuration mode.
    device# configure terminal
    
  2. Create and name a QoS DSCP-to-traffic class map.
    device(config)# qos map dscp-traffic-class dscpTcMap
    
  3. Define the QoS DSCP-to-traffic class values.
    device(config-dscp-traffic-class-dscpTcMap)# map dscp 10 to traffic-class 3 
    device(config-dscp-traffic-class-dscpTcMap)# map dscp 40 to traffic-class 4 
    device(config-dscp-traffic-class-dscpTcMap)# map dscp 45 to traffic-class 5 
    device(config-dscp-traffic-class-dscpTcMap)# map dscp 52 to traffic-class 3 
    
    The default value is used for those DSCP that are not explicitly defined.
  4. Return to privileged exec mode.
    device(config-dscp-traffic-class-dscpTcMap)# end
    
  5. Verify the configuration.
    device# show qos maps dscp-traffic-class 
    
    Dscp-to-Traffic-Class map 'dscpTcMap' 
    {x/y: traffic-class = x, drop-precedence = 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 4/2 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:
    
  6. Save the running-config file to the startup-config file.
    device# copy running-config startup-config
    

QoS DSCP-to-traffic class and drop precedence map configuration example

device# configure terminal
device(config)# qos map dscp-traffic-class dscpTcMap
device(config-dscp-traffic-class-dscpTcMap)# map dscp 10 to traffic-class 3 
device(config-dscp-traffic-class-dscpTcMap)# map dscp 40 to traffic-class 4 
device(config-dscp-traffic-class-dscpTcMap)# map dscp 45 to traffic-class 5 
device(config-dscp-traffic-class-dscpTcMap)# map dscp 52 to traffic-class 3 
device(config-dscp-traffic-class-dscpTcMap)# end
device# show qos maps dscp-traffic-class 
device# copy running-config startup-config