Switchport Voice Vlan - Cisco Catalyst 3750 Command Reference Manual

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
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. When the port is connected to a Cisco
IP phone, the IP phone requires two MAC addresses: one for the access VLAN and the other for the voice
VLAN. Connecting a PC to the IP phone requires additional MAC addresses.
If any type of port security is enabled on the access VALN, dynamic port security is automatically
enabled on the voice VLAN.
You cannot configure static secure MAC addresses in the voice VLAN.
A voice-VLAN port cannot be a private-VLAN port.
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.
Examples
This example shows how to configure VLAN 2 as the voice VLAN for the port:
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# switchport voice vlan 2
You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC
command.
Related Commands Command
show interfaces
switchport priority extend
78-16181-03
interface-id switchport
Description
Displays the administrative and operational status of a
switching (nonrouting) port.
Decides how the device connected to the specified port
handles priority traffic received on its incoming port.
Catalyst 3750 Switch Command Reference

switchport voice vlan

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