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Chapter 2
Catalyst 3560 Switch Cisco IOS Commands
Usage Guidelines
The drop-threshold percentage for threshold 3 is predefined. It is set to the queue-full state.
The egress queue default settings are suitable for most situations. You should change them only when
Note
you have a thorough understanding of the egress queues and if these settings do not meet your quality
of service (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 CoS value to a different queue and threshold combination, allowing the frame to
follow different behavior.
Examples
This example shows how to map a port to queue-set 1. It maps CoS 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 cos-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
mls qos srr-queue output dscp-map
mls qos queue-set output threshold
queue-set
show mls qos interface
show mls qos maps
show mls qos queue-set
78-16405-05
Description
Maps Differentiated Services Code Point (DSCP) values to an
egress queue or maps DSCP values to a queue and to a
threshold ID.
Configures the WTD thresholds, guarantees the availability of
buffers, and configures the maximum memory allocation to a
queue-set.
Maps a port to a queue-set.
buffers
Displays QoS information.
Displays QoS mapping information.
Displays egress queue settings for the queue-set.
mls qos srr-queue output cos-map
Catalyst 3560 Switch Command Reference
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