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Catalyst 3560 Switch Command Reference
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Chapter 2 Catalyst 3560 Switch Cisco IOS Commands
mls qos srr-queue output dscp-map
Usage Guidelines The drop-threshold percentage for threshold 3 is predefined. It is set to the queue-full state.
Note The egress queue default settings are suitable for most situations. You should change them only when
you have a thorough understanding of the egress queues and if these settings do not meet your QoS
solution.
You can assign two weighted tail-drop (WTD) threshold percentages to an egress queue by using the mls
qos queue-set output qset-id threshold global configuration command.
You can map each DSCP value to a different queue and threshold combination, allowing the frame to
follow different behavior.
You can map up to eight DSCP values per command.
Examples This example shows how to map a port to queue-set 1. It maps DSCP values 0 to 3 to egress queue 1 and
to threshold ID 1. It configures the drop thresholds for queue 1 to 50 and 70 percent of the allocated
memory, guarantees (reserves) 100 percent of the allocated memory, and configures 200 percent as the
maximum memory that this queue can have before packets are dropped.
Switch(config)# mls qos srr-queue output dscp-map queue 1 threshold 1 0 1 2 3
Switch(config)# mls qos queue-set output 1 threshold 1 50 70 100 200
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# queue-set 1
You can verify your settings by entering the show mls qos maps, the show mls qos interface
[interface-id] buffers, or the show mls qos queue-set privileged EXEC command.
Related Commands Command Description
mls qos srr-queue output cos-map Maps class of service (CoS) values to an egress queue or maps
CoS values to a queue and to a threshold ID.
mls qos queue-set output threshold Configures the WTD thresholds, guarantees the availability of
buffers, and configures the maximum memory allocation to a
queue-set.
queue-set Maps a port to a queue-set.
show mls qos interface buffers Displays quality of service (QoS) information.
show mls qos maps Displays QoS mapping information.
show mls qos queue-set Displays egress queue settings for the queue-set.
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