C
HAPTER
36
| VLAN Commands
Configuring Voice VLANs
– 1162 –
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)#
voice vlan aging This command sets the Voice VLAN ID time out. Use the no form to restore
the default.
SYNTAX
voice vlan aging minutes
no voice vlan
minutes - Specifies the port Voice VLAN membership time out.
(Range: 5-43200 minutes)
DEFAULT SETTING
1440 minutes
COMMAND MODE
Global Configuration
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