Configuring The Ip Phone To Trust The Cos Priority Of Incoming Data Frames - Cisco Catalyst 3550 series Software Configuration Manual

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:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3 switchport priority extend trust
Step 4 end
Step 5
show interfaces interface-id
switchport
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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.
Catalyst 3550 Multilayer Switch Software Configuration Guide
14-6
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface connected to
the IP phone.
Set the IP phone access port to trust the priority received from the PC or the
attached device.
Return to privileged EXEC mode.
Verify your entries.
Chapter 14 Configuring Voice VLAN
78-11194-09