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13 Configuring QoS
13.1 Configuring priority control
This section describes how to configure priority control which assigns egress port queue of
different priority to User priority value (CoS) in VLAN tag.
Beginning in privileged EXEC mode, follow these steps to configure priority control on specific
interface:
Command Purpose
Step 1 configure Enter global configuration mode
Step 2 interface interface-id Specify the interface, and enter interface
configuration mode. The interface can be a
physical Layer 2 interface or a port channel
(logical interface).
Step 3 queue trust dot1p Set the trust mode to dot1p.
Step 4 queue cos-map priority-id queue-id Assign a priority ID to specific traffic class
queue to configure dot1p priority mapping.
Step 5 exit Return to global configuration mode.
Step 6 exit Return to privileged EXEC mode.
Step 7 show queue cos-map interface-id Verify the configuration.
To configure priority control and assign priority mapping to an interface, use the CoS
interface configuration command. To display the configuration, use show queue cos-map
privileged EXEC command.
In this example, cos-map is configured on interface 0/1 to assigns egress port queue of
different priority to User priority value (CoS) in VLAN tag:
(BX900-CB1)#configure
(BX900-CB1)(Config)#interface 0/1
(BX900-CB1)(Interface BX900-CB1/0/1)#queue trust dot1p
(BX900-CB1)(Interface BX900-CB1/0/1)#queue cos-map 0 1
(BX900-CB1)(Interface BX900-CB1/0/1)#queue cos-map 1 2
(BX900-CB1)(Interface BX900-CB1/0/1)#queue cos-map 4 2
(BX900-CB1)(Interface BX900-CB1/0/1)#exit
(BX900-CB1)#show queue cos-map 0/1
User Priority Traffic Class
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