C
HAPTER
36
| VLAN Commands
Configuring Voice VLANs
– 1163 –
COMMAND USAGE
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 Remaining Age 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 the voice
VLAN aging time to 5 minutes, then after 5.5 minutes, a port will be
removed from 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 Remaining Age.
EXAMPLE
The following example configures the Voice VLAN aging time as 3000
minutes.
Console(config)#voice vlan aging 3000
Console(config)#
voice vlan
mac-address
This command specifies MAC address ranges to add to the OUI Telephony
list. Use the no form to remove an entry from the list.
SYNTAX
voice vlan mac-address mac-address mask mask-address
[description description]
no voice vlan mac-address mac-address mask mask-address
mac-address - Defines a MAC address OUI that identifies VoIP
devices in the network. (For example, 01-23-45-00-00-00)
mask-address - Identifies a range of MAC addresses. (Range: 80-
00-00-00-00-00 to FF-FF-FF-FF-FF-FF)
description - User-defined text that identifies the VoIP devices.
(Range: 1-32 characters)
DEFAULT SETTING
None
COMMAND MODE
Global Configuration
COMMAND USAGE
â—† VoIP devices attached to the switch can be identified by the
manufacturer’s Organizational Unique Identifier (OUI) in the source
MAC address of received packets. OUI numbers are assigned to
manufacturers and form the first three octets of device MAC addresses.
The MAC OUI numbers for VoIP equipment can be configured on the
switch so that traffic from these devices is recognized as VoIP.
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