Voice VLAN

Voice VLAN Configuration guide

   Configuring Ports to Carry Voice Traffic in 802.1Q Frames

switchport voice vlan{vlan-id | dot1p |none |untagged}

Configure how the Cisco IP Phone carries voice traffic: •vlan-id—Configure the Cisco IP Phone to forward all voice traffic through the specified VLAN. By default, the Cisco IP Phone forwards the voice traffic with an 802.1Q priority of 5. Valid VLAN IDs are from 1 to 4094. •dot1p—Configure the Cisco IP Phone to use 802.1p priority tagging for voice traffic and to use the default native VLAN (VLAN 0) to carry all traffic. By default, the Cisco IP Phone forwards the voice traffic with an 802.1p priority of 5. •none—Allow the IP phone to use its own configuration to send untagged voice traffic. •untagged—Configure the phone to send untagged voice traffic

   Overriding the CoS Priority of Incoming Data Frames

You can configure the switch to override the priority of frames arriving on the IP phone port from connected devices.

switchport priority extend cos value

Set the IP phone access port to override the priority received from the PC or the attached device. The CoS value is a number from 0 to 7. Seven is the highest priority. The default is 0.

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

switchport priority extend trust

Set the IP phone access port to trust the priority received from the PC or the attached device.

   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.