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Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 26 Configuring QoS
Configuring Standard QoS
To return to the default setting, use the no srr-queue bandwidth share interface configuration
command.
This example shows how to configure the weight ratio of the SRR scheduler running on an egress port.
Four queues are used, and the bandwidth ratio allocated for each queue in shared mode is 1/(1+2+3+4),
2/(1+2+3+4), 3/(1+2+3+4), and 4/(1+2+3+4), which is 10 percent, 20 percent, 30 percent, and 40
percent for queues 1, 2, 3, and 4. This means that queue 4 has four times the bandwidth of queue 1, twice
the bandwidth of queue 2, and one-and-a-third times the bandwidth of queue 3.
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# srr-queue bandwidth share 1 2 3 4
Limiting the Egress Bandwidth on a Queue-Set
You can limit the egress bandwidth on a standard port mapped to a queue-set. For example, if a customer
pays only for a small percentage of a high-speed link, you can limit the bandwidth to that amount.
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 only if these settings do not meet your QoS
solution.
Beginning in privileged EXEC mode, follow these steps to limit the egress bandwidth on a standard port.
This procedure is optional.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify a port, and enter interface configuration mode.
Step 3
srr-queue bandwidth share weight1
weight2 weight3 weight4
Assign SRR weights to the egress queues.
By default, all four weights are 25 (1/4 of the bandwidth is allocated to
each queue).
For weight1 weight2 weight3 weight4, enter the weights to control the
ratio of the frequency in which the SRR scheduler sends packets. Separate
each value with a space. The range is 1 to 255.
Step 4
end Return to privileged EXEC mode.
Step 5
show mls qos interface interface-id
queueing
Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify a standard port to be rate-limited, and enter interface
configuration mode.
Step 3
srr-queue bandwidth limit weight1 Specify the percentage of the port speed to which the port should be
limited. The range is 10 to 90. This command is not supported on an ES
port.
By default, the port is not rate limited and is set to 100 percent.
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