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Configuring Standard QoS
Configuring the Egress Expedite Queue
Beginning in Cisco IOS Release 12.1(19)EA1, you can ensure that certain packets have priority over all
others by queuing them in the egress expedite queue. SRR services this queue until it is empty before
servicing the other queues.
Beginning in privileged EXEC mode, follow these steps to enable the egress expedite queue. This
procedure is optional.
Command
Step 1
configure terminal
Step 2
mls qos
Step 3
interface interface-id
Step 4
priority-queue out
Step 5
end
Step 6
show running-config
Step 7
copy running-config startup-config
To disable the egress expedite queue, use the no priority-queue out interface configuration command.
This example shows how to enable the egress expedite queue when the SRR weights are configured. The
egress expedite queue overrides the configured SRR weights.
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# srr-queue bandwidth shape 25 0 0 0
Switch(config-if)# srr-queue bandwidth share 30 20 25 25
Switch(config-if)# priority-queue out
Switch(config-if)# end
Limiting the Bandwidth on an Egress Interface
You cannot configure SSR shaped weights on the 10-Gigabit interfaces.
Note
You can limit the bandwidth on an egress port. 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 default settings are suitable for most situations. You should change them only when
you have a thorough understanding of the egress queues and if these settings do not meet your QoS
solution.
Catalyst 3750 Switch Software Configuration Guide
32-66
Purpose
Enter global configuration mode.
Enable QoS on a switch.
Specify the egress port, and enter interface configuration mode.
Enable the egress expedite queue, which is disabled by default.
When you configure this command, the SRR weight and queue size ratios
are affected because there is one fewer queue participating in SRR. This
means that weight1 in the srr-queue bandwidth shape or the srr-queue
bandwidth share command is ignored (not used in the ratio calculation).
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 32
Configuring QoS
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