LevelOne ProCon GSW-2692 User Manual download pdf (Page 163)

Class of Service Configuration

3-127

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 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.

Web – Click Priority, Queue Mode. Select Strict or WRR, then click Apply.

Figure 3-74 Queue Mode

CLI – The following sets the queue mode to strict priority service mode.

Setting the Service Weight for Traffic Classes

This switch uses the Weighted Round Robin (WRR) algorithm to determine the

frequency at which it services each priority queue. As described in “Mapping CoS

Values to Egress Queues” on page 3-125, the traffic classes are mapped to one of

the four egress queues provided for each port. You can assign a weight to each of

these queues (and thereby to the corresponding traffic priorities). This weight sets

the frequency at which each queue will be polled for service, and subsequently

affects the response time for software applications assigned a specific priority value.

Command Attributes

• WRR Setting Table

– Displays a list of weights for each traffic class (i.e., queue).

• Weight Value – Set a new weight for the selected traffic class. However, note that

Queue 0 is fixed at a weight of 1, and cannot be configured. (Range: 1-31)

Console(config)#queue mode wrr 4-169

Console(config)#exit

Console#show queue mode 4-172

Queue mode: wrr

Console#

14. CLI shows Queue ID.

1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 389 390

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LevelOne ProCon GSW-2692 User Manual Page 163