SMC Networks SMC8150L2 manual Enabling CoS, Selecting the Queue Mode

Class of Service Configuration 3

CLI – The following example shows how to change the CoS assignments.

Console(config)#interface ethernet					1/1	4-116
Console(config-if)#queue				cos-map 0	0	4-187
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				4-189
Information of Eth		1/1	3	4 5 6 7
CoS Value:	0	1 2
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.

Figure 3-86 Enable Traffic Classes

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.

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