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Quality of Service (QoS)
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39.22 AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E Software Version 5.2.1
Egress Queue Shaping
This section is concerned with how the egress queues are cleared. There are two aspects to
queue shaping:
■ Scheduling (strict priority or weighted round robin)
■ Drop Mode (tail-drop or weighted early discard)
Scheduling
The scheduler determines how packets in the eight egress port queues are serviced. Two
servicing methods can be applied:
■ strict priority
■ weighted round robin
Strict priority servicing
By default, all queues on all ports are serviced in a strict priority order. This means that the
highest numbered priority queue (queue 7) is emptied first; then when it is completely empty,
the next highest priority queue is processed, and so on. Thus, for a strict priority queue to be
processed, all higher priority queues must be empty.
Strict priority servicing is the default setting; however if your system is configured for weighted-
round-robin, you can return it to priority queueing by using the commands shown in the
following example.
Example
To return queue 3 of port 1.0.1 from WRR servicing to strict priority queueing:
awplus#
configure terminal
awplus(config)#
interface port1.0.1
awplus(config-if)#
priority-queue 3