Avaya P580 User Manual download pdf (Page 681)

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Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 -35

80-Series QoS

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,

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 6-156 lists the default weight increment for each queue.

Table 6-156. Default Weight Increments

Queue Weight Increment

WFQ 0 1

WFQ 1 2

WFQ 2 4

1 of 2

1 2 ... 676 677 678 679 680 681 682 683 684 685 686 ... 759 760

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Avaya P580 User Manual Page 681

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