Switchport Voice Vlan - Cisco Catalyst 3550 Command Reference Manual

Chapter 2 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.
Syntax Description
vlan-id
dot1p
none
untagged
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 Release
12.1(9)EA1
Usage Guidelines You should configure voice VLAN on access ports.
Before you enable voice VLAN, we recommend 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 enable port security on an interface that is also configured with a voice VLAN, you must set
the maximum allowed secure addresses on the port to at least two.
If any type of port security is enabled on the access VLAN, dynamic port security is automatically
enabled on the voice VLAN.
You cannot configure static secure MAC addresses on the voice VLAN.
The Port Fast feature is automatically enabled when voice VLAN is configured. When you disable voice
VLAN, the Port Fast feature is not automatically disabled.
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switchport voice vlan {vlan-id | dot1p | none | untagged}
no switchport voice vlan
VLAN used for voice traffic. Valid IDs are from 1 to 4094.
The telephone uses priority tagging and uses VLAN 0 (the native VLAN). By default,
the Cisco IP phone forwards the voice traffic with an 802.1P priority of 5.
The telephone is not instructed through the CLI about the voice VLAN. The telephone
uses the configuration from the telephone key pad.
The telephone does not tag frames and uses VLAN 4095. The default for the telephone
is untagged.
Modification
This command was first introduced.
Catalyst 3550 Multilayer Switch Command Reference
switchport voice vlan
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