WFQ Case Study Interface Congestion Cont

Forwarded Packets

Forwarded Packets

• HQO is the maximum number of packets that the WFQ system can hold and HQO = 10.

• Absolute maximum (HQO=10) exceeded, new packet is the last in the TDM system and is dropped.

The new packet is dropped.

WFQ Case Study Flow Congestion

Early dropping (of aggressive flows) should start when there are eight packets (congestive discard threshold) in the WFQ system.

The example illustrates how WFQ can drop packets even if the WFQ system is still within the hold-queue limit. The system, however, is above the CDT limit. In this case, a packet can be dropped if it is the last in the system.

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