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Document No. 650-100-700, Issue 1 25-35
80-Series QoS
For information on how to set up WFQ, see “ Setting Up WFQ ” later in this
chapter.
Example
Suppose that the accumulated weight of all queues is set at their weight
increments.
1. The switch services queue 7 because its accumulated weight is 128.
2. The accumulated weight of queue 7 is reset to 128, and the accumulated
weight of all other queues is increased by their weight increment.
At this point, queue 7 and queue 6 both have an accumulated weight of
128.
3. The switch services queue 7 because it is the higher priority queue.
4. The accumulated weight of queue 7 is then reset to 128, and the
accumulated weight of all other queues is increased by their weight
increment.
Now queue 6 has an accumulated weight of 192, and queue 7 has an
accumulated weight of 128.
5. The switch services queue 6 because it has the higher accumulated
weight.
Strict Priority Queueing
With strict priority queuing, the switch services the eight queues in order of
their priority. The highest priority queue is serviced until it is empty, and
then the lower priority queues are serviced sequentially until they are empty.
For example, queue 7 must be empty before the switch services queue 6.
Queue 6 must be empty before the switch services queue 5. Queue 5 must
be empty before the switch services queue 4, and so on.
For information on how to set up strict priority queueing, see “ Setting Up
Strict Priority Queueing ” later in this chapter.
WFQ 5 32
WFQ 6 64
WFQ 7 128
Table 25-20. Default Weight Increments
Queue Weight Increment
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