Enabling Cos; Selecting The Queue Mode; Figure 3-85 Traffic Classes; Figure 3-86 Enable Traffic Classes - SMC Networks SMC8126L2 Management Manual

CLI – The following example shows how to change the CoS assignments.
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:
Priority Queue: 0 1 2 1 2 2 3 3
Console#

Enabling CoS

Enable or disable Class of Service (CoS). Command Attributes
• Traffic Classes – Click to enable Class of Service. (Default: Enabled)
Web – Click Priority, Traffic Classes Status.

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, 8, for queues 0 through 3 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.
0 1 2 3 4 5 6 7

Figure 3-86 Enable Traffic Classes

Class of Service Configuration
3
4-116
4-187
4-189
3-147