Queue-Servicing Algorithms; Wfq - Avaya Cajun P882 User Manual

Multiservice switch

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Queue-Servicing Algorithms

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1

The following queue-servicing algorithms are available for egress

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,

you can set only egress queues to use these queue-

servicing algorithms. To service ingress queues, use the

policing feature.

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 21-20 lists the default weight increment for each queue.

Table 21-20. Default Weight Increments

80-Series QoS

Weight Increment

P550r P580 P880