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29-22

Software Configuration Guide—Release 12.2(25)EW

OL-6696-01

Chapter 29 Configuring QoS

Configuring QoS

Before configuring 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 the Catalyst 4000 family switch:

• Default QoS Configuration, page 29-22

• Configuration Guidelines, page 29-24

• Enabling QoS Globally, page 29-24

• Configuring a Trusted Boundary to Ensure Port Security, page 29-24

• Enabling Dynamic Buffer Limiting, page 29-26

• Creating Named Aggregate Policers, page 29-26

• Configuring a QoS Policy, page 29-28

• Configuring User Based Rate Limiting, page 29-35

• Enabling or Disabling QoS on an Interface, page 29-39

• Configuring VLAN-Based QoS on Layer 2 Interfaces, page 29-39

• Configuring the Trust State of Interfaces, page 29-40

• Configuring the CoS Value for an Interface, page 29-41

• Configuring DSCP Values for an Interface, page 29-42

• Configuring Transmit Queues, page 29-43

• Configuring DSCP Maps, page 29-45

Default QoS Configuration

Table 29-3 shows the QoS default configuration.

Table 29-3 QoS Default Configuration

Feature Default Value

Global QoS configuration Disabled

Interface QoS configuration (port based) Enabled when QoS is globally enabled

Interface CoS value 0

Interface DSCP value 0

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