Cisco WS-C2960-24TC-S Software Guide - Page 537
no mls qos trust device, trust dscp
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Chapter 28 Configuring QoS Configuring Standard QoS the telephone is connected to trust the CoS labels of all traffic received on that port. Use the mls qos trust dscp interface configuration command to configure a routed port to which the telephone is connected to trust the DSCP labels of all traffic received on that port. With the trusted setting, you also can use the trusted boundary feature to prevent misuse of a high-priority queue if a user bypasses the telephone and connects the PC directly to the switch. Without trusted boundary, the CoS labels generated by the PC are trusted by the switch (because of the trusted CoS setting). By contrast, trusted boundary uses CDP to detect the presence of a Cisco IP Phone (such as the Cisco IP Phone 7910, 7935, 7940, and 7960) on a switch port. If the telephone is not detected, the trusted boundary feature disables the trusted setting on the switch port and prevents misuse of a high-priority queue. Note that the trusted boundary feature is not effective if the PC and Cisco IP Phone are connected to a hub that is connected to the switch. In some situations, you can prevent a PC connected to the Cisco IP Phone from taking advantage of a high-priority data queue. You can use the switchport priority extend cos interface configuration command to configure the telephone through the switch CLI to override the priority of the traffic received from the PC. Beginning in privileged EXEC mode, follow these steps to enable trusted boundary on a port: Step 1 Step 2 Step 3 Command configure terminal cdp run interface interface-id Step 4 cdp enable Step 5 mls qos trust cos mls qos trust dscp Purpose Enter global configuration mode. Enable CDP globally. By default, CDP is enabled. Specify the port connected to the Cisco IP Phone, and enter interface configuration mode. Valid interfaces include physical ports. Enable CDP on the port. By default, CDP is enabled. Configure the switch port to trust the CoS value in traffic received from the Cisco IP Phone. or Configure the routed port to trust the DSCP value in traffic received from the Cisco IP Phone. By default, the port is not Step 6 Step 7 Step 8 Step 9 mls qos trust device cisco-phone end show mls qos interface copy running-config startup-config ed. Specify that the Cisco IP Phone is a trusted device. You cannot enable both trusted boundary and auto-QoS (auto qos voip interface configuration command) at the same time; they are mutually exclusive. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To disable the trusted boundary feature, use the no mls qos trust device interface configuration command. OL-8603-04 Catalyst 2960 Switch Software Configuration Guide 28-37
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