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C
LASS
OF
S
ERVICE
C
ONFIGURATION
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CLI – The following example shows how to change the CoS assignments
to a one-to-one mapping.
Note: Mapping specific values for CoS priorities is implemented as an
interface configuration command, but any changes will apply to
the all interfaces on the switch.
Selecting the Queue Mode
You can set the switch to service the queues based on a strict rule that
requires all traffic in a higher priority queue to be processed before lower
priority queues are serviced, or use Weighted Round-Robin (WRR)
queuing that specifies a relative weight of each queue. WRR uses a
predefined relative weight for each queue that determines the percentage
of service time the switch services each queue before moving on to the
next queue. This prevents the head-of-line blocking that can occur with
strict priority queuing.
Command Attributes
• WRR - Weighted Round-Robin shares bandwidth at the egress ports
by using scheduling weights 1, 2, 4, 6, 8, 10, 12, 14 for queues 0 through
7 respectively. (This is the default selection.)
• Strict - Services the egress queues in sequential order, transmitting all
traffic in the higher priority queues before servicing lower priority
queues.
Console(config)#interface ethernet 1/1 4-132
Console(config)#queue cos-map 0 0 4-213
Console(config)#queue cos-map 1 1
Console(config)#queue cos-map 2 2
Console(config)#exit
Console#show queue cos-map ethernet 1/1 4-215
Information of Eth 1/1
Traffic Class : 0 1 2 3 4 5 6 7
Priority Queue: 0 1 2 3 4 5 6 7
Information of Eth 1/2
Traffic Class : 0 1 2 3 4 5 6 7
Priority Queue: 0 1 2 3 4 5 6 7
.
.
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