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Inside Cisco IOS Software Architecture (CCIE Professional Development) by Russ CCIE #2635 White, Curtis CCIE #1521 Murphy, Vijay CCIE #1606 Bollapragada

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Weighted Fair Queuing

There are two implementations of Weighted Fair Queuing (WFQ) in IOS:

  • Platform-independent WFQ

  • Distributed Weighted Fair Queuing (DWFQ)

All Cisco platforms covered in this book, except Cisco 12000, support platform-independent WFQ. DWFQ is available only on VIP interfaces on 7500 series routers when dCEF switching is enabled.

Platform-Independent WFQ

IOS has two implementations of platform-independent WFQ:

  • Flow-Based WFQ

  • Class-Based CBWFQ

Flow-Based WFQ

Flow-Based WFQ is similar to custom queuing in its effect on traffic streams, but rather than defining a static policy to sort the packets into the individual queues, the streams are sorted automatically. Flow-Based WFQ is a legacy congestion management feature in IOS and ...

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