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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
mls qos queue-set output buffers
mls qos queue-set output buffers
Use the mls qos queue-set output buffers global configuration command to allocate buffers to a
queue-set (four egress queues per port). Use the no form of this command to return to the default setting.
mls qos queue-set output qset-id buffers allocation1 ... allocation4
no mls qos queue-set output qset-id buffers
Syntax Description
Defaults All allocation values are equally mapped among the four queues (25, 25, 25, 25). Each queue has 1/4 of
the buffer space.
Command Modes Global configuration
Command History
Usage Guidelines Specify four allocation values, and separate each with a space.
Allocate buffers according to the importance of the traffic. For example, give a larger percentage of the
buffer to the queue with the highest-priority traffic.
To configure different classes of traffic with different characteristics, use this command with the mls qos
queue-set output qset-id threshold global configuration command.
Note The egress queue-set default settings are suitable for most situations. You should change them only when
you have a thorough understanding of the queues and if these settings do not meet your quality of service
(QoS) solution.
Examples This example shows how to map a port to queue-set 2. It allocates 40 percent of the buffer space to egress
queue 1 and 20 percent each to egress queues 2, 3, and 4.
Switch(config)# mls qos queue-set output 2 buffers 40 20 20 20
Switch(config)# interface fastethernet1/0/1
Switch(config-if)# queue-set 2
qset-id ID of the queue-set. Each port belongs to a queue-set, which defines all the
characteristics of the four egress queues per port. The range is 1 to 2.
allocation1 ...
allocation4
Buffer space allocation (percentage) for each queue (four values for queues 1 to 4).
For allocation1, allocation3, and allocation4, the range is 0 to 99. For allocation2,
the range is 1 to 100 (including the CPU buffer). Separate each value with a space.
Release Modification
12.1(14)AX This command was introduced.
12.2(25)EY The range for allocation1, allocation3, and allocation4 changed from 0 to
100 to 0 to 99. The range for allocation2 changed from 20 to 100 to 1 to 100.
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