User`s manual

User’s Manual 277
16.129 queue cos-map
This command assigns class of service (CoS) values to the priority queues (For example, hardware output
queues 0 - 7). Use the no form set the CoS map to the default values.
Syntax Description
queue cos-map queue_id [cos1 ... cosn]
no queue cos-map
queue_id The ID of the priority queue. Ranges are 0 to 7, where 7 is the highest priority
queue.
cos1 .. cosn The CoS values that are mapped to the queue ID. It is a space-separated list of
numbers. The CoS value is a number from 0 to 7, where 7 is the highest
priority.
Default
This switch supports Class of Service by using eight priority queues, with Weighted Round Robin queuing
for each port. Eight separate traffic classes are defined in IEEE 802.1p. The default priority levels are
assigned according to recommendations in the IEEE 802.1p standard as shown below.
Queue 0 1 2 3 4 5 6 7
Priority 2 0 1 3 4 5 6 7
Command Mode
Interface Configuration (Ethernet, Port Channel)
Usage Guidelines
CoS values assigned at the ingress port are also used at the egress port.
This command sets the CoS priority for all interfaces.
Example
The following example shows how to change the CoS assignments to a one-to-one mapping:
Console(config)#interface ethernet 1/1
Console(config-if)#queue cos-map 0 0
Console(config-if)#queue cos-map 1 1
Console(config-if)#queue cos-map 2 2
Console(config-if)#exit
Console#show queue cos-map ethernet 1/1
Information of Eth 1/1
Cos Value : 0 1 2 3 4 5 6 7
Priority Queue: 0 1 2 3 4 5 6 7
Console#