33-36
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 33 Configuring QoS
Configuring Standard QoS
Beginning in privileged EXEC mode, follow these steps to enable VLAN-based QoS. This procedure is
required on physical ports that are specified in the interface level of a hierarchical policy map on an SVI.
Use the no mls qos vlan-based interface configuration command to disable VLAN-based QoS on the
physical port.
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 33-43:
• Configuring the Trust State on Ports within the QoS Domain, page 33-36
• Configuring the CoS Value for an Interface, page 33-38
• Configuring a Trusted Boundary to Ensure Port Security, page 33-39
• Enabling DSCP Transparency Mode, page 33-40
• Configuring the DSCP Trust State on a Port Bordering Another QoS Domain, page 33-41
Configuring the Trust State on Ports within the QoS Domain
Packets entering a QoS domain are classified at the edge of the QoS domain. When the packets are
classified at the edge, the switch port within the QoS domain can be configured to one of the trusted
states because there is no need to classify the packets at every switch within the QoS domain.
Figure 33-12 shows a sample network topology.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the physical port, and enter interface configuration
mode.
Step 3
mls qos vlan-based Enable VLAN-based QoS on the port.
Step 4
end Return to privileged EXEC mode.
Step 5
show mls qos interface interface-id Verify if VLAN-based QoS is enabled on the physical port.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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