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32-28

Catalyst 3750 Switch Software Configuration Guide

78-16180-02

Chapter 32 Configuring QoS

Displaying Auto-QoS Information

To display the initial auto-QoS configuration, use the show auto qos [interface [interface-id]]

privileged EXEC command. To display any user changes to that configuration, use the show

running-config privileged EXEC command. You can compare the show auto qos and the show

running-config command output to identify the user-defined QoS settings.

To display information about the QoS configuration that might be affected by auto-QoS, use one of these

commands:

• show mls qos

• show mls qos maps cos-dscp

• show mls qos interface [interface-id] [buffers | queueing]

dscp-output-q]

• show mls qos input-queue

• show running-config

For more information about these commands, refer to the command reference for this release.

Configuring Standard QoS

Before configuring standard QoS, you must have a thorough understanding of these items:

• The types of applications used and the traffic patterns on your network.

• Traffic characteristics and needs of your network. Is the traffic bursty? Do you need to reserve

bandwidth for voice and video streams?

• Bandwidth requirements and speed of the network.

• Location of congestion points in the network.

These sections describe how to configure QoS on your switch:

• Default Standard QoS Configuration, page 32-29

• Standard QoS Configuration Guidelines, page 32-31

• Enabling QoS Globally, page 32-32 (required)

• Configuring Classification Using Port Trust States, page 32-32 (required

• Configuring a QoS Policy, page 32-38 (required)

• Configuring DSCP Maps, page 32-49 (optional, unless you need to use the

DSCP-to-DSCP-mutation map or the policed-DSCP map)

• Configuring Ingress Queue Characteristics, page 32-55 (optional)

• Configuring Egress Queue Characteristics, page 32-60 (optional)

Cisco WS-C3750-48PS-S User Manual

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