User Guide

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4. Click Apply to set the mapping of the VLAN group to the VLAN. This mapping does not
bind the interface dynamically to the VLAN; the interface must be manually added to the
VLAN.)
Voice VLAN
In a LAN, voice devices, such as IP phones, VoIP endpoints, and voice systems are placed into the
same VLAN. This VLAN is referred as the voice VLAN. If the voice devices are in different voice
VLANs, IP (Layer 3) routers are needed to provide communication.
Auto Voice VLAN
The device supports the Telephony OUI (Organization Unique Identifier) voice VLAN mode. The
two modes affect how voice VLAN and/or voice VLAN port memberships are configured.
In Telephony OUI mode, the voice VLAN must be a manually-configured VLAN, and cannot be the
default VLAN.
When the device is in Telephony OUI mode and a port is manually configured as a candidate to join
the voice VLAN, the device dynamically adds the port to the voice VLAN if it receives a packet
with a source MAC address matching one of the configured telephony OUIs. An OUI is the first
three bytes of an Ethernet MAC address. For more information about Telephony OUI, see
Telephony OUI Interfaces
.
Voice End-Points
To have a voice VLAN work properly, the voice devices, such as IP phones and VoIP endpoints,
must be assigned to the voice VLAN where it sends and receives its voice traffic.
Two possible scenarios:
•
A phone/endpoint may be statically configured with the voice VLAN.
•
A phone/endpoint may obtain the voice VLAN in the boot file it downloads from a TFTP
server. A DHCP server may specify the boot file and the TFTP server when it assigns an IP
address to the phone.
You can create a network policy manually or enable the device to automatically generate a
network policy, based on a voice VLAN configuration.
The device expects the attaching voice devices to send voice VLAN, tagged packets. On ports
where the voice VLAN is the native VLAN or that is configured with auto voice VLAN by Telephony
OUI, voice VLAN untagged packets are possible.