Cisco Catalyst 3550 series Software Configuration Manual page 654

Configuring Standard QoS
Beginning in privileged EXEC mode, follow these steps to allocate bandwidth to each queue:
Command
Step 1
configure terminal
Step 2
mls qos
Step 3
interface interface-id
Step 4 wrr-queue bandwidth weight1 weight2
weight3 weight4
Step 5
end
Step 6
show mls qos interface queueing
Step 7 copy running-config startup-config
To return to the default bandwidth setting, use the no wrr-queue bandwidth interface configuration
command.
This example shows how to configure the weight ratio of the WRR scheduler running on the egress
queues. In this example, four queues are used (no expedite queue), and the ratio of the bandwidth
allocated for each queue is 1/(1+2+3+4), 2/(1+2+3+4), 3/(1+2+3+4), and 4/(1+2+3+4), which is 1/10,
2/10, 3/10, and 4/10 for queues 1, 2, 3, and 4.
Switch(config)# interface fastethernet0/1
Switch(config-if)# wrr-queue bandwidth 1 2 3 4
Catalyst 3550 Multilayer Switch Software Configuration Guide
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Purpose
Enter global configuration mode.
Enable QoS on the switch.
Enter interface configuration mode, and specify the egress 10/100
Ethernet interface.
Assign WRR weights to the egress queues.
By default, all the weights are set to 25 (1/4 of the bandwidth is allocated
to each queue).
For weight1 weight2 weight3 weight4, enter the ratio, which determines
the ratio of the frequency in which the WRR scheduler dequeues
packets. Separate each value with a space. The range is 1 to 65536.
All four queues participate in the WRR unless the expedite queue
(queue 4) is enabled, in which case weight4 is ignored (not used in the
ratio calculation). The expedite queue is a priority queue, and it is
serviced until empty before the other queues are serviced.
A weight of 1 means that the minimum bandwidth is allocated for that
queue.
To allocate no bandwidth for a queue, use the wrr-queue cos-map
interface configuration command so that the available bandwidth is
shared among the remaining queues.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 29 Configuring QoS
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