Syntax Description

Parameter

Descri ption

congestive-discard-threshold

(Optional) Number of messages allowed in the WFQ system. The default is 64 messages, and a new threshold must be a power of 2 in the range from 16 to 4096. When a conversation reaches this threshold, new message packets are discarded.

dynamic-queues

(Optional) Number of dynamic queues used for best-effort conversations. Values are 16, 32, 64, 128, 256, 512, 1024, 2048, and 4096.

reservable-queues

(Optional) Number of reservable queues used for reserved conversations in the range 0 to 1000. The default is 0. Reservable queues are used for interfaces configured for features such as RSVP.

The same hold-queue command that can be used with FIFO queuing can also be used with WFQ. The default hold-queue limit with WFQ is 1000 packets.

The WFQ system will generally never reach the hold-queue limit because the CDT limit starts dropping packets of aggressive flows. Under special circumstances, it would be possible to fill the WFQ system. For example, a denial-of-service attack that floods the interface with a large number of packets (each different) could fill all queues at the same rate.

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