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Document No. 10-300077, Issue 2 25-33
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 and later, you can
set only egress queues to use these queue-servicing algorithms.
To service ingress queues, use the policing feature.
This section contains the following information and procedures:
■ WFQ
■ Strict Priority Queueing
■ CBQ
■ CBWFQ
■ Management Traffic
■ Setting Up WFQ
■ Setting Up Strict Priority Queueing
■ Setting Up CBQ
■ Setting Up CBWFQ
■ Displaying the Queue-Service Settings
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.