CBWFQ and LLQ

Basic methods are combined to create more versatile queuing mechanisms.

Basic methods are combined to create more versatile queuing mechanisms.

Neither the basic queuing methods nor the more advanced WFQ completely solve quality of service (QoS) problems resulting from converged network traffic. These problems remain:

■ If only priority queuing (PQ) is used for a voice-enabled network, voice will get the priority needed, but data traffic will likely starve out at some point.

■ If only custom queuing (CQ) is used for a voice-enabled network, data traffic will be assured of some bandwidth, but voice traffic will suffer excessive delays.

■ If WFQ is used, voice still experiences delay, even when treated "fairly" by WFQ and no bandwidth guarantees can be made for data applications.

■ All of the classification, marking, and queuing mechanisms are complicated to use and time-consuming when applied on an interface-by-interface basis.

Newer queuing mechanisms take the best aspects of existing queuing methods and apply them to give voice the priority it requires while still ensuring that data is serviced efficiently on a class basis.

This topic describes the purpose and features of CBWFQ.

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