Accton Technology ES5508 manual 398

4 Command Line Interface

Priority Commands (Layer 2)

Table 4-63 Priority Commands (Layer 2)

Command	Function	Mode	Page
queue mode	Sets the queue mode to strict priority or Weighted	GC	4-186
	Round-Robin (WRR)
switchport priority default	Sets a port priority for incoming untagged frames	IC	4-187
queue bandwidth	Assigns round-robin weights to the priority queues	IC	4-188
queue cos-map	Assigns class-of-service values to the priority queues	IC	4-188
show queue mode	Shows the current queue mode	PE	4-189
show queue bandwidth	Shows round-robin weights assigned to the priority queues	PE	4-190
show queue cos-map	Shows the class-of-service map	PE	4-190
show interfaces switchport	Displays the administrative and operational status of an	PE	4-132
	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, 8, 10, 12, 14 for queues 0 - 7 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.

4-186