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Class of Service Configuration
26-4
26
Web – Click Priority, Traffic Classes. Assign priorities to the traffic classes (i.e.,
output queues), then click Apply.
Figure 26-2 Traffic Classes
CLI – The following example shows how to change the CoS assignments to a
one-to-one mapping.
* 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.
Console(config)#interface ethernet 1/1 45-1
Console(config)#queue cos-map 0 0 55-4
Console(config)#queue cos-map 1 1
Console(config)#queue cos-map 2 2
Console(config)#exit
Console#show queue cos-map
55-6
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
Information of Eth 1/2
CoS Value: 0 1 2 3 4 5 6 7
Priority Queue: 0 1 2 3 4 5 6 7
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