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Motorola EX-3524 Cli Reference Manual: Class Of Service Commands

Layer 2 gigabit ethernet poe/poe+ switch.
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Chapter 18

| Class of Service Commands

Priority Commands (Layer 2)
queue mode
This command sets the scheduling mode used for processing each of the class of
service (CoS) priority queues. The options include strict priority, Weighted Round-
Robin (WRR), or a combination of strict and weighted queuing. Use the no form to
restore the default value.
Syntax
queue mode {strict | wrr | strict-wrr [queue-type-list]}
no queue mode
strict - Services the egress queues in sequential order, transmitting all
traffic in the higher priority queues before servicing lower priority queues.
This ensures that the highest priority packets are always serviced first,
ahead of all other traffic.
wrr - Weighted Round-Robin shares bandwidth at the egress ports by using
scheduling weights (based on the
each queue in a round-robin fashion.
strict-wrr - Strict priority is used for the high-priority queues and WRR for
the rest of the queues.
queue-type-list - Indicates if the queue is a normal or strict type.
(Options: 0 indicates a normal queue, 1 indicates a strict queue)
Default Setting
Strict and WRR, with Queue 3 using strict mode
Command Mode
Global Configuration
Command Usage
The switch can be set to service the port queues based on strict priority, WRR,
or a combination of strict and weighted queueing.
Strict priority requires all traffic in a higher priority queue to be processed
before lower priority queues are serviced.
Weighted Round Robin (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. Use the
assign weights for WRR queuing to the eight priority queues.
If Strict and WRR mode is selected, a combination of strict service is used for the
high priority queues and weighted service for the remaining queues. The
queues assigned to use strict priority should be specified using the queue-type-
list parameter.
A weight can be assigned to each of the weighted queues (and thereby to the
corresponding traffic priorities). This weight sets the frequency at which each
queue weight
– 430 –
command), and servicing
queue weight
command to

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