Cisco Catalyst 2950 Software Configuration Manual page 547

Chapter 29 Configuring QoS
Figure 29-4
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
78-11380-12
Port Trusted States within the QoS Domain
Trusted interface
P3 P1
IP
Trusted boundary
Purpose
Enter global configuration mode.
Specify the interface to be trusted, and enter interface configuration
mode.
Valid interfaces include physical interfaces.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Trunk
Traffic classification
performed here
Configuring Standard QoS
29-21