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39-82

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

OL-21521-01

Chapter 39 Configuring QoS

Configuring Standard QoS

To return to the default setting, use the no mls qos queue-set output qset-id buffers global configuration

command. To return to the default WTD threshold percentages, use the no mls qos queue-set output

qset-id threshold [queue-id] global configuration command.

This example shows how to map a port to queue-set 2. It alloc

ates 40 percent of the buffer space to egress

queue 1 and 20 percent to egress queues 2, 3, and 4. It configures the drop thresholds for queue 2 to 40

and 60 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 queue-set output 2 buffers 40 20 20 20

Switch(config)# mls qos queue-set

output 2 threshold 2 40 60 100 200

Switch(config)# interface gigabit

ethernet1/0/1

Switch(config-if)# queue-set 2

Mapping DSCP or CoS Values to an Egress Queue and to a Threshold ID

You can prioritize traffic by placing packets with particular DSCPs or costs of service into certain queues

and adjusting the queue thresholds so that packets with lower priorities are dropped.

Note The egress queue default settings are suitable for most situations. You should change them only when

you have a thorough understanding of egress queues and if these settings do not meet your QoS solution.

Step 7

show mls qos interface [interface-id]

buffers

Verify your entries.

Step 8

copy running-config startup-config (Optional) Save your entries in the configuration file.

Command Purpose

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