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Voice VLAN Commands
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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 helps prevent excessive packet delays, packet loss, and jitter, which
results in higher voice quality. This is best achieved by assigning all VoIP
traffic to a single 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 the global auto-detection status is
enabled.
Example
The following example enables VoIP traffic detection and specifies the Voice VLAN
ID as 1234.
switchport voice vlan security Enables Voice VLAN security on ports IC 4-284
switchport voice vlan priority Sets the VoIP traffic priority for ports IC 4-285
show voice vlan Displays Voice VLAN settings PE 4-286
Console(config)#voice vlan 1234
Console(config)#
Table 4-73 Voice VLAN Commands
Command Function Mode Page