Cisco Systems 3130 User Manual

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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide

OL-13270-01

Chapter 36 Configuring QoS

Configuring Standard QoS

Beginning in privileged EXEC mode, follow these steps to enable the egress expedite queue. This
procedure is optional.

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 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.

Beginning in privileged EXEC mode, follow these steps to limit the bandwidth on an egress port. This
procedure is optional.

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

mls qos

Enable QoS on a switch.

Step 3

interface interface-id

Specify the egress port, and enter interface configuration mode.

Step 4

priority-queue out

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).

Step 5

end

Return to privileged EXEC mode.

Step 6

show running-config

Verify your entries.

Step 7

copy running-config startup-config

(Optional) Save your entries in the configuration file.