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Cisco IE 3000 Switch Software Configuration Guide
OL-13018-03
Chapter 36 Configuring QoS
Configuring Standard QoS
General QoS Guidelines
These are general QoS guidelines:
• You configure QoS only on physical ports; there is no support for it at the VLAN level.
• Control traffic (such as spanning-tree bridge protocol data units [BPDUs] and routing update
packets) received by the switch are subject to all ingress QoS processing.
• You are likely to lose data when you change queue settings; therefore, try to make changes when
traffic is at a minimum.
Enabling QoS Globally
By default, QoS is disabled on the switch.
Beginning in privileged EXEC mode, follow these steps to enable QoS. This procedure is required.
To disable QoS, use the no mls qos global configuration command.
Configuring Classification Using Port Trust States
These sections describe how to classify incoming traffic by using port trust states. Depending on your
network configuration, you must perform one or more of these tasks or one or more of the tasks in the
“Configuring a QoS Policy” section on page 36-39:
• Configuring the Trust State on Ports within the QoS Domain, page 36-33
• Configuring the CoS Value for an Interface, page 36-34
• Configuring a Trusted Boundary to Ensure Port Security, page 36-35
• Enabling DSCP Transparency Mode, page 36-36
• Configuring the DSCP Trust State on a Port Bordering Another QoS Domain, page 36-37
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
mls qos Enable QoS globally.
QoS runs with the default settings described in the “Default Standard QoS
Configuration” section on page 36-28, the “Queueing and Scheduling on
Ingress Queues” section on page 36-13, and the “Queueing and Scheduling
on Egress Queues” section on page 36-15.
Step 3
end Return to privileged EXEC mode.
Step 4
show mls qos Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
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