Messages are sorted into flows

© 2004 Cisco Systems, Inc. All rights re bcran v2.1—10-3

WFQ overcomes an important limitation of FIFO queuing. It is an automated method that provides fair bandwidth allocation to all network traffic. It provides traffic management that dynamically prioritizes traffic into conversations, or flows. WFQ then breaks up a stream of packets within each conversation to ensure that bandwidth is shared fairly between individual conversations. There are four types of WFQ: flow-based, distributed, class-based, and distributed class-based.

WFQ is a flow-based algorithm that moves delay-sensitive traffic to the front of a queue to reduce response time, and shares remaining bandwidth fairly among high-bandwidth flows. By breaking up packet trains, WFQ assures that low-volume traffic is transferred in a timely fashion. WFQ gives low-volume traffic, such as Telnet sessions, priority over high-volume traffic, such as FTP sessions. It gives concurrent file transfers a balanced use of available bandwidth. WFQ automatically adapts to changing network traffic conditions.

WFQ is enabled by default for physical interfaces whose bandwidth is less than or equal to 2.048 Mbps.

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