SMC Networks 100BASE-TX manual Queue bandwidth, Syntax Queue mode strict wrr no queue mode

4 Command Line Interface

queue mode

This command sets the queue mode to strict priority or Weighted Round-Robin (WRR) for the class of service (CoS) priority queues. Use the no form to restore the default value.

Syntax

queue mode {strict wrr} no queue mode

•strict - Services the egress queues in sequential order, transmitting all traffic in the higher priority queues before servicing lower priority queues.

•wrr - Weighted Round-Robin shares bandwidth at the egress ports by using scheduling weights 1, 2, 4, 6 for queues 0 - 3 respectively.

Default Setting

Weighted Round Robin

Command Mode

Global Configuration

Command Usage

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.

Example

The following example sets the queue mode to strict priority service mode:

Console(config)#queue mode strict

Console(config)#

queue bandwidth

This command assigns weighted round-robin (WRR) weights to the four class of service (CoS) priority queues. Use the no form to restore the default weights.

Syntax

queue bandwidth weight1...weight4 no queue bandwidth

weight1...weight4 - The ratio of weights for queues 0-3 determines the weights used by the WRR scheduler. However, note that Queue 0 is fixed at a weight of 1, and cannot be configured. (Range: 1-31)

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