Cisco 3750G - Catalyst Integrated Wireless LAN Controller Configuration Manual page 749

Chapter 33 Configuring QoS
Figure 33-12
Beginning in privileged EXEC mode, follow these steps to configure the port to trust the classification
of the traffic that it receives:
Command
Step 1 configure terminal
Step 2 interface interface-id
OL-8550-02
Port Trusted States within the QoS Domain
Trusted interface
P3 P1
IP
Trusted boundary
Purpose
Enter global configuration mode.
Specify the port to be trusted, and enter interface configuration
mode.
Valid interfaces include physical ports.
Trunk
Traffic classification
performed here
Catalyst 3750 Switch Software Configuration Guide
Configuring Standard QoS
33-37