Command Line Interface
4-248
4
voice vlan
This command enables VoIP traffic detection and defines the Voice VLAN ID. Use
the
no
form to disable the Voice VLAN.
Syntax
voice vlan
voice-vlan-id
no voice vlan
voice-vlan-id
- Specifies the voice VLAN ID. (Range: 1-4094)
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
• When IP telephony is deployed in an enterprise network, it is recommended
to isolate the Voice over IP (VoIP) network traffic from other data traffic. Traffic
isolation can provide higher voice quality by preventing excessive packet
delays, packet loss, and jitter. This is best achieved by assigning all VoIP
traffic to a single Voice VLAN.
• VoIP traffic can be detected on switch ports by using the source MAC address
of packets, or by using LLDP (IEEE 802.1AB) to discover connected VoIP
devices. When VoIP traffic is detected on a configured port, the switch
automatically assigns the port as a tagged member of the Voice VLAN.
• Only one Voice VLAN is supported and it must already be created on the
switch before it can be specified as the Voice VLAN.
• The Voice VLAN ID cannot be modified when global auto-detection status is
enabled (see the
switchport voice vlan
command on page 4-250).
Example
The following example enables VoIP traffic detection and specifies the Voice VLAN
ID as 1234.
switchport voice vlan priority
Sets the VoIP traffic priority for ports
IC
4-252
show voice vlan
Displays Voice VLAN settings
PE
4-253
Console(config)#voice vlan 1234
Console(config)#
Table 4-74 Voice VLAN Commands
(Continued)
Command
Function
Mode
Page
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