C
LASS
OF
S
ERVICE
12-6
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, 8, 10, 12, 14 for queues 0 through 7
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 12-3 Queue Mode
CLI – The following sets the queue mode to strict priority service mode.
Console(config)#queue mode strict 31-2
Console(config)#exit
Console#show queue mode 31-7
Queue mode: strict
Console#
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