C
HAPTER
37
| Class of Service Commands
Priority Commands (Layer 2)
– 872 –
queue cos-map This command assigns class of service (CoS) values to the priority queues
(i.e., hardware output queues 0 - 7). Use the no form set the CoS map to
the default values.
SYNTAX
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 SETTING
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.
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
â—† CoS values assigned at the ingress port are also used at the egress
port.
â—† 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: 2 0 1 3 4 5 6 7
Console#
Table 107: Default CoS Priority Levels
Priority 01234567
Queue 01234567
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