Support For Voice Vlan On Various Ports - 3Com WX3000 Series Operation Manual

Processing mode of untagged packets sent by IP voice devices
Automatic mode. A WX3000 device automatically adds a port connecting an IP voice device to the
voice VLAN by learning the source MAC address in the untagged packet sent by the IP voice
device when it is powered on. The voice VLAN uses the aging mechanism to maintain the number
of ports in the voice VLAN. When the aging timer expires, the ports whose OUI addresses are not
updated (that is, no voice traffic passes) will be removed from the voice VLAN. In automatic mode,
ports can not be added to or removed from a voice VLAN manually.
Manual mode: In this mode, you need to add a port to a voice VLAN or remove a port from a voice
VLAN manually.
Processing mode of tagged packets sent by IP voice devices
Tagged packets from IP voice devices are forwarded based on their tagged VLAN IDs, whether the
automatic or manual mode is used.
If the voice traffic transmitted by an IP voice device carries VLAN tags, and 802.1x authentication
and guest VLAN is enabled on the port which the IP voice device is connected to, assign different
VLAN IDs for the voice VLAN, the default VLAN of the port, and the 802.1x guest VLAN to ensure
the effective operation of these functions.
If the voice traffic transmitted by an IP voice device carries no VLAN tag, the default VLAN of the
port which the IP voice device is connected to must be configured as the voice VLAN. In this case,
the 802.1x authentication is unavailable.

Support for Voice VLAN on Various Ports

Voice VLAN packets can be forwarded by access ports, trunk ports, and hybrid ports. You can enable a
trunk or hybrid port belonging to other VLANs to forward voice and service packets simultaneously by
enabling the voice VLAN.
The support for different types of voice traffic (that is, tagged traffic and untagged traffic) varies with port
mode and port type, as listed in Table 1-2.
1-4