3Com WX3000 operation manual Support for Voice Vlan on Various Ports

Processing mode of untagged packets sent by IP voice devices

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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.

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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.

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