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Chapter 36: VLAN Commands
Configuring Voice VLANs
voice vlan aging
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 (see the
E
XAMPLE
The following example enables VoIP traffic detection and specifies the Voice
VLAN ID as 1234.
Console(config)#voice vlan 1234
Console(config)#
This command sets the Voice VLAN ID time out. Use the no form to restore
the default.
S
YNTAX
voice vlan aging minutes
no voice vlan
minutes - Specifies the port Voice VLAN membership time out.
(Range: 5-43200 minutes)
D
S
EFAULT
ETTING
1440 minutes
C
M
OMMAND
ODE
Global Configuration
C
U
OMMAND
SAGE
The Voice VLAN aging time is the time after which a port is removed from
the Voice VLAN when VoIP traffic is no longer received on the port.
The VoIP aging time starts to count down when the OUI's MAC address
expires from the MAC address table. Therefore, the MAC address aging
time should be added to the overall aging time. For example, if you
configure the MAC address table aging time to 30 seconds, and voice VLAN
aging time to 5 minutes, then after 5.5 minutes, a port will be removed
from the voice VLAN when VoIP traffic is no longer received on the port.
Alternatively, if you clear the MAC address table manually, then the switch
will also start counting down the voice VLAN aging time.
– 1115 –
switchport voice vlan
command.
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