Chapter 21
| VLAN Commands
Configuring Voice VLANs
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Command Usage
◆ When OUI is selected, be sure to configure the MAC address ranges in the
Telephony OUI list (see the voice vlan mac-address command. MAC address OUI
numbers must be configured in the Telephony OUI list so that the switch
recognizes the traffic as being from a VoIP device.
◆ LLDP checks that the “telephone bit” in the system capability TLV is turned on.
See “LLDP Commands” on page 745 for more information on LLDP.
Example
The following example enables the OUI method on port 1 for detecting VoIP traffic.
Console(config)#interface ethernet 1/1
Console(config-if)#switchport voice vlan rule oui
Console(config-if)#
switchport voice vlan
security
This command enables security filtering for VoIP traffic on a port. Use the no form
to disable filtering on a port.
Syntax
[no] switchport voice vlan security
Default Setting
Disabled
Command Mode
Interface Configuration
Command Usage
◆ Security filtering discards any non-VoIP packets received on the port that are
tagged with the voice VLAN ID. VoIP traffic is identified by source MAC
addresses configured in the Telephony OUI list, or through LLDP that discovers
VoIP devices attached to the switch. Packets received from non-VoIP sources
are dropped.
◆ When enabled, be sure the MAC address ranges for VoIP devices are configured
in the Telephony OUI list (voice vlan mac-address).
Example
The following example enables security filtering on port 1.
Console(config)#interface ethernet 1/1
Console(config-if)#switchport voice vlan security
Console(config-if)#
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