Configuring QoS DiffServ Configuration
Configuration Guide  
  445
Step 5 show qos interface [fastEthernet 
port-list 
|
 
gigabitEthernet 
port-list
] [port-channel 
lagid-list
 ]
Verify the CoS value of the port. If no port is specified, it displays the CoS values of  all ports.
port-list:
 The list of Ethernet ports.
lagid-list:
 The list of LAGs.
Step 6 end
Return to privileged EXEC mode. 
Step 7 copy running-config startup-config
Save the settings in the configuration file.
Note:
All the ports in the same LAG should be assigned with the same port priority.
The following example shows how to map port 1-3 to TC1, and keep other mapping 
relations as default:
Switch#configure
Switch(config)#show qos cos-map
 -----+-----+-----+----+-----+-----+-----+----+----
 Tag |0         |1       |2      |3        |4        |5       |6      |7
 -----+-----+-----+----+-----+-----+-----+----+----
 TC   |TC1  |TC0  |TC2 |TC3 |TC4 |TC5  |TC6 |TC7
 -----+-----+-----+----+-----+-----+-----+----+----
Switch(config)#interface range gigabitEthernet 1/0/1-3
Switch(config-if-range)#qos 0
Switch(config-if-range)#show qos interface gigabitEthernet 1/0/1-3
Port              CoS Value              LAG
----------       ---------------             ------------
Gi1/0/1       CoS 0                       N/A
Gi1/0/2       CoS 0                       N/A
Gi1/0/3       CoS 0                       N/A
Switch(config-if-range)#end
Switch#copy running-config startup-config