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Priority-queue – Allied Telesis AT-DC2552XS User Manual

Page 510

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Chapter 21: Quality of Service (QoS) Commands

510

Section V: Security and Traffic Control

PRIORITY-QUEUE

Syntax

priority-queue

queue_numbers

Parameter

queue_numbers

Specifies one or multiple numbers of egress queues to use the
Strict Priority Queuing (PQ) technique. The queue number can be
0 to 7. Use a space to separate numbers. By default, all egress
queues are specified in Strict PQ.

Mode

Port Interface mode

Description

Use this command to specify egress queues in the specified port to use
the Strict Priority Queuing (PQ) technique to schedule queues. In Strict
PQ, packets in a high-priority queue are scheduled before packets in
lower-priority queues. The switch empties a queue before moving to a
lower-priority queue.

Strict PQ has higher priority than WRR queuing. When a port uses both
Strict PQ and Weight Round Robin (WRR) scheduling, packets in WRR
queues are not forwarded until queues in Strict PQ are emptied.

You must enable QoS on the switch to use this command. To enable QoS,
see “MLS QOS ENABLE” on page 503.

Confirmation Command

“SHOW MLS QOS INTERFACE” on page 519

Example

This example specifies egress queues on the port 1.0.10 to use the Strict
PQ technique:

awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.10
awplus(config-if)# priority-queue 0 1 2 3 4 5 6 7