• Simple configuration (no need for classification to be configured)
• Guarantees throughput to all flows
• Drops packets of most aggressive flows
• Supported on most platforms
• Supported in most Cisco IOS versions
• Possibility of multiple flows ending up in one queue
• Lack of control over classification
• Supported only on links less than or equal to 2 Mb
• Cannot provide fixed bandwidth guarantees
As good as WFQ is, it does have its drawbacks:
■ Multiple flows can end up in a single queue.
■ WFQ does not allow a network engineer to manually configure classification. Classification and scheduling are determined by the WFQ algorithm.
■ WFQ is supported only on links with a bandwidth less than or equal to 2 Mb.
■ WFQ cannot provide fixed guarantees to traffic flows.
© 2006 Cisco Systems, Inc. Implement the DiffServ QoS Model 4-81
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