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Command Line Interface
4-186
4
Priority Commands (Layer 2)
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.
Table 4-63 Priority Commands (Layer 2)
Command Function Mode Page
queue mode Sets the queue mode to strict priority or Weighted
Round-Robin (WRR)
GC 4-186
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
interface
PE 4-132