Name: Cisco 2950 - Catalyst Switch
Brand: Cisco
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19-6

Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide

78-11380-10

Chapter 19 Configuring Voice VLAN

Displaying Voice VLAN

Configuring the IP Phone to Trust the CoS Priority of Incoming Data Frames

You can connect a PC or other data device to a Cisco 7960 IP Phone port. The PC can generate packets

with an assigned CoS value. You can configure the switch to trust the priority of frames arriving on the

IP phone port from connected devices.

Beginning in privileged EXEC mode, follow these steps to trust the CoS priority received from the

nonvoice port on the Cisco 7960 IP Phone:

Use the no switchport priority extend interface configuration command or the switchport priority

extend cos 0 interface configuration command to return the port to its default setting.

Displaying Voice VLAN

To display voice VLAN for an interface, use the show interfaces interface-id switchport privileged

EXEC command.

For detailed information about the fields in the display, refer to the command reference for this release.

Command Purpose

Step 1

configure terminal Enter global configuration mode.

Step 2

interface interface-id Enter interface configuration mode, and specify the interface connected to

the IP phone.

Step 3

switchport priority extend trust Set the IP phone access port to trust the priority received from the PC or the

attached device.

Step 4

end Return to privileged EXEC mode.

Step 5

show interfaces interface-id

switchport

Verify your entries.

Step 6

copy running-config startup-config (Optional) Save your entries in the configuration file.

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Cisco 2950 - Catalyst Switch Specifications

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