Selecting The Queue Mode; Figure 3-73. Traffic Classes - SMC Networks 100BASE-TX Management Manual

Web – Click Priority, Traffic Classes. Mark an interface and click Select to display
the current mapping of CoS values to output queues. Assign priorities to the traffic
classes (i.e., output queues) for the selected interface, then click Apply.
CLI – 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)#end
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 1 2 2 3 3
Console#
* 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.

Figure 3-73. Traffic Classes

Class of Service Configuration
3
4-104
4-166
4-168
3-123