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| VLAN Commands
Configuring Voice VLANs
– 865 –
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: 1-4093)
DEFAULT SETTING
Disabled
COMMAND MODE
Global Configuration
COMMAND USAGE
â—† 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.
â—† 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.
â—† Only one Voice VLAN is supported and it must already be created on the
switch before it can be specified as the Voice VLAN.
â—† The Voice VLAN ID cannot be modified when the global auto-detection
status is enabled (see the switchport voice vlan command.
EXAMPLE
The following example enables VoIP traffic detection and specifies the Voice
VLAN ID as 1234.
Console(config)#voice vlan 1234
Console(config)#
switchport voice vlan rule Sets the automatic VoIP traffic detection method for
ports
IC
switchport voice vlan
security
Enables Voice VLAN security on ports IC
show voice vlan Displays Voice VLAN settings PE
Table 104: Voice VLAN Commands (Continued)
Command Function Mode
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