Avaya J100 Series IP Phones supports two VLAN separation modes:
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No VLAN separation mode: In this mode, the CPU port of the port receives untagged frames and tagged VLAN frames on any VLAN irrespective of whether the phone sends untagged or tagged frames. This traffic can be received from the PC port or LAN port. The filtering of the frames is done by the CPU itself. In order to reduce unnecessary traffic to the CPU, the administrator should configure only the necessary VLANs on the external switch port, in particular, voice VLAN and data VLAN.
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Full VLAN separation mode: This is the default mode. In this mode, the CPU port of the phone receives tagged frames with VLAN ID = L2QVLAN whether they are from the LAN port or the PC port. The PC port receives untagged or tagged frames with VLAN ID = PHY2VLAN from the LAN port. The PC port cannot send any untagged frames or tagged frames with any VLAN ID, including the voice VLAN ID, to the CPU. Frames received externally on the PC port can only be sent to the LAN port if they are untagged frames or tagged frames with VLAN ID= PHY2VLAN. In this mode, there is a complete separation between the CPU port and the PC port. In order to configure Avaya J100 Series IP Phones to work in this mode, all of the following conditions must be met:
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VLANSEPMODE = 1 (default)
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L2Q = 0 (auto, default) or 1 (tag)
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L2QVLAN is not equal to 0
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PHY2VLAN is not equal to 0
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L2QVLAN is not equal to PHY2VLAN
In this mode, phone can send and receive Ethernet frames that are tagged voice VLAN ID (L2QVLAN). If there is a DHCP server on this LAN that is reachable by this phone, then this server can also send and receive tagged frames with the same VLAN ID.
If one of these conditions is not met then the phone works in no VLAN separation mode where all kinds of traffic reaches the CPU port of the phone.
Note:
The phone can send tagged VLAN frames on the voice VLAN (L2QVLAN), but still not work in full VLAN separation mode. For example, when PHY2VLAN = 0 or VLANSEPMODE = 0.
