Cisco 3020 - Cisco Catalyst Blade Switch Specifications download pdf (Page 543)

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Cisco Catalyst Blade Switch for HP Command Reference

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Chapter 2 Cisco Catalyst Blade Switch 3020 for HP Cisco IOS Commands

switchport voice vlan

Use the switchport voice vlan interface configuration command to configure voice VLAN on the port.

Use the no form of this command to return to the default setting.

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

no switchport voice vlan

Syntax Description

Defaults The switch default is not to automatically configure the telephone (none).

The telephone default is not to tag frames.

Command Modes Interface configuration

Command History

Usage Guidelines You should configure voice VLAN on Layer 2 access ports.

You must enable Cisco Discovery Protocol (CDP) on the switchport connected to the Cisco IP phone for

the switch to send configuration information to the phone. CDP is enabled by default globally and on the

interface.

Before you enable voice VLAN, we recommend that you enable quality of service (QoS) on the switch

by entering the mls qos global configuration command and configure the port trust state to trust by

entering the mls qos trust cos interface configuration command.

When you enter a VLAN ID, the IP phone forwards voice traffic in IEEE 802.1Q frames, tagged with

the specified VLAN ID. The switch puts IEEE 802.1Q voice traffic in the voice VLAN.

When you select dot1q, none, or untagged, the switch puts the indicated voice traffic in the access

VLAN.

In all configurations, the voice traffic carries a Layer 2 IP precedence value. The default is 5 for voice

traffic.

vlan-id Specify the VLAN to be used for voice traffic. The range is 1 to 4094. By default, the

IP phone forwards the voice traffic with an IEEE 802.1Q priority of 5.

dot1p Configure the telephone to use IEEE 802.1p priority tagging and uses VLAN 0 (the

native VLAN). By default, the Cisco IP phone forwards the voice traffic with an

IEEE 802.1p priority of 5.

none Do not instruct the IP telephone about the voice VLAN. The telephone uses the

configuration from the telephone key pad.

untagged Configure the telephone to send untagged voice traffic. This is the default for the

telephone.

Release Modification

12.2(25)SEF This command was introduced.

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