Weighted fair queuing (WFQ) creates a queue for every class for which a class map is defined. Packets
satisfying the match criteria for a class accumulate in the queue reserved for the class until they are sent, which
occurs when the queue is serviced by the fair queuing process. When the maximum packet threshold you
defined for the class is reached, queuing of any further packets to the class queue causes tail drop.
You use queue limits to configure Weighted Tail Drop (WTD). WTD ensures the configuration of more than
one threshold per queue. Each class of service is dropped at a different threshold value to provide for QoS
differentiation.
You can configure the maximum queue thresholds for the different subclasses of traffic, that is, DSCP and
CoS and configure the maximum queue thresholds for each subclass.
Examples
The following example configures a policy map called port-queue to contain policy for a class called dscp-1.
The policy for this class is set so that the queue reserved for it has a maximum packet limit of 20 percent:
Device(config)# policy-map policy11
Device(config-pmap)# class dscp-1
Device(config-pmap-c)# bandwidth percent 20
Device(config-pmap-c)# queue-limit dscp 1 percent 20
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
659
queue-limit
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