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Cisco ME 3400 Ethernet Access Switch Command Reference
OL-9640-10
Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
queue-limit
Within an output policy map only four queues (classes) are allowed, including the class default. Each
queue has three defined thresholds (queue limits). Only three queue-limit configurations are allowed on
the switch, but multiple policy maps can share the same queue-limits. For two policy maps to share a
queue-limit configuration, all threshold values must be the same for all classes in both policy maps.
If you try to attach an output policy map that contains a fourth queue-limit configuration to an interface,
you see an error message, and the attachment is not allowed.
The queue-limit command is supported only after you first configure a scheduling action, such as
bandwidth, shape-average, or priority, except when you configure queue-limit in the class-default of
an output policy map.
You cannot configure more than two unique threshold values for WTD qualifiers (cos, dscp,
precedence, or qos-group) in the queue-limit command. However, you can map any number of
qualifiers to those thresholds. You can configure a third unique threshold value to set the maximum
queue, using the queue-limit command with no qualifiers.
When you use the queue-limit command to configure thresholds within a class map, the WTD thresholds
must be less than or equal to the maximum threshold of the queue. This means that the queue size
configured without a qualifier must be larger than any of the queue sizes configured with a qualifier.
Examples This example shows how to configure WTD so that out-class1, out-class2, out-class3, and class-default
get a minimum of 40, 20, 10 and 10 percent of the traffic bandwidth respectively. The corresponding
queue-sizes are set to 48, 32, 16 and 272 (256-byte) packets:
Switch(config)# policy-map out-policy
Switch(config-pmap)# class outclass1
Switch(config-pmap-c)# bandwidth percent 40
Switch(config-pmap-c)# queue-limit 48
Switch(config-pmap-c)# exit
Switch(config-pmap)# class outclass2
Switch(config-pmap-c)# bandwidth percent 20
Switch(config-pmap-c)# queue-limit 32
Switch(config-pmap-c)# exit
Switch(config-pmap)# class outclass3
Switch(config-pmap-c)# bandwidth percent 10
Switch(config-pmap-c)# queue-limit 16
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class-default
Switch(config-pmap-c)# bandwidth percent 10
Switch(config-pmap-c)# queue-limit 272
Switch(config-pmap-c)# exit
Switch(config-pmap)# exit
Switch(config)# interface gigabitethernet 0/1
Switch(config-if)# service-policy output out-policy
Switch(config-if)# exit
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