Allocating Bandwidth Among Egress Queues - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 29 Configuring QoS
Beginning in privileged EXEC mode, follow these steps to enable the egress expedite queue:
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.

Allocating Bandwidth among Egress Queues

You need to specify how much of the available bandwidth is allocated to each queue. The ratio of the
weights is the ratio of frequency in which the WRR scheduler dequeues packets from each queue.
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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.
Enable the egress expedite queue, which is disabled by default.
When you configure this command, the WRR weight is affected
because there is one fewer queue participating in WRR. This means that
weight4 in the wrr-queue bandwidth 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.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Standard QoS
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