Queuing Comparison Summary


Flow-Ba&eel WFÛ

C laa a-Base d liVFO

Low Latency Queuing

No dasscs

Up to classcs

Up to 64 daises

Weights IP flows

Weights Glasses

Priorities classes (volte), weights remaining fli&Hi

litírjtíivc tm+f'c-getw lowefti weight

IJSír^cfiníd ílpsíí! gel custom weight

Fm rlty nasen fiervefl (1 rut

File trausier gets balan ced tic ceas

Highly customizable

Designed la faring prioritize VoIP

Enabled üy default

Must configure

Must configure

© 2004 Cisco Systems, Inc. All rights reserved. bcran v2.1—10-5

WFQ is enabled by default. It does not use queue lists to determine the preferred traffic on a serial interface. Instead, the fair queue algorithm dynamically sorts traffic into messages that are part of a conversation. The messages are queued with low-volume conversations (usually interactive traffic), and given priority over high-volume, bandwidth-intensive conversations, such as file transfers. When multiple file transfers occur, the transfers are given comparable bandwidth.

CBWFQ allows network managers to customize fair queuing behavior so that user-defined classes of traffic receive guaranteed bandwidth during times of congestion. More than one flow, or conversation, can belong to a user-defined class. LLQ adds strict PQ to CBWFQ operation. LLQ allows you to specify a priority class which will be served first, before any of the other classes of traffic. The PQ with LLQ will not starve the other classes because the PQ is policed whether or not there is congestion.

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