Cisco Systems 3550 Configuring the Egress Queue Size Ratios

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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter20 Co nf iguring QoS
Configuring QoS
Configuring the Egress Queue Size Ratios
Beginning in privileged EXEC mode, follow these steps to configure the egre ss queue siz e ra tios:
To return to the default weights, use the no wrr-queue queue-limit interface configuration command.
This example shows how to configure the size ratio of the four queues. The ratio of the size allocated
for each queue is 1/10, 2/10, 3/10, and 4/10 to qu eu e 1, 2, 3 , an d 4 . (Q ueue 4 is four t ime s larger tha n
queue 1, twice as large as queue 2, and 1.33 times as large as queue 3.)
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# wrr-queue queue-limit 1 2 3 4
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 mls qos Enable QoS on the switch.
Step3 interface interface-id Enter interface configuration mode, and specify the egress
Gigabit-capable Ethernet interface.
Step4 wrr-queue queue-limit weight1 weight2
weight3 weight4 Configure the egress queue size ratios.
The defaults weights are 25 (1/4 of the buffer size is allocated to each
queue).
For weight1, weight2, weight3, and weight4, specify a weight from 1
to 100. Separate each value with a space.
The relative size difference in the numbers indicates the relative
differences in the queue sizes.
The port enters a halt mode when this command is issued.
Step5 end Return to privileged EXEC mode.
Step6 show mls qos interface buffers Verify your entries.
Step7 copy running-config startup-config (Optional) Save your entries in the configuration file.