3com WX3000 Manuel D’Utilisation

 

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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. 

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Manual mode: In this mode, you need to add a port to a voice VLAN or remove a port from a voice 

VLAN manually. 

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. 

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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. 

 

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 

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