Avaya Cajun P580, User Manual, Page: 694 / 770

25-34 User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0
Chapter 25
Queue-Servicing Algorithms
The following queue-servicing algorithms are available for egress queues:
■
Weighted fair queueing (WFQ)
■
Strict Priority
■
Class-based queueing (CBQ)
■
Class-based weighted fair queueing (CBWFQ)
* Note: In earlier versions of the switch software, you could set ingress
queues to use the weighted fair queuing (WFQ) and strict
priority queue-servicing algorithms. In v5.3.1 and later, you
can set only egress queues to use these queue-servicing
algorithms. To service ingress queues, use the policing feature.
WFQ
How WFQ Works
WFQ is the default queue-servicing algorithm. When a port is set to use the
WFQ algorithm, each queue:
■
Is assigned a weight increment. This value never changes.
■
Maintains an accumulated weight. After the switch services a
queue, its accumulated weight is reset to the value of its weight
increment, and the accumulated weight for the other queues is
increased by their respective weight increments.
The switch always services the queue that has the highest accumulated
weight. If two queues have the same accumulated weight, the switch first
services the queue that has the highest priority (0 – 7).
Table 25-20 lists the default weight increment for each queue.
Table 25-20. Default Weight Increments
Queue Weight Increment
WFQ 0 1
WFQ 1 2
WFQ 2 4
WFQ 3 8
WFQ 4 16
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