20-55
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-03
Chapter20 Configuring QoS Configuring QoS
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 WR R sche du ler runni ng on t he eg re ss
queues. In this example, four queues are used (no expedit e que ue ), a nd the ra tio of t he b an dw idth
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
Step4 wrr-queue bandwidth weight1 weight2
weight3 weight4 Assign WRR weights to the egress queues.
By default, all the weight s ar e s et t o 2 5 (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 drops packets.
Separate each value with a space. The range is 0 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 strict-priority queue, and it
is serviced until empty before the other queues are serviced.
A weight of 0 means no bandwidth is allocated for that queue, and the
available bandwidth is shared among the remaining queues.
Step5 end Return to privileged EXEC mode.
Step6 show mls qos interface queueing Verify your entries.
Step7 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose