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The Avaya Multiservice switch is compliant with the IEEE 802.1Q standard for VLANs and defines a Tag Header. Two Tag formats are defined as an Ethernet Encoded (4 bytes) for 802.3 and Ethernet V2 and SNAP (Service Network Access Point) for Token Ring and Fiber Distributed Data Interface (FDDI).
The Ethernet version of the Tag Header consists of 4 bytes, two bytes for Tag Protocol ID and two bytes for Tag Control. The Tag Protocol ID bytes contain an Ethernet Type value of 81-00 which identifies the frame as a tagged frame. The Tag Control specifies tag formats that are used to embed explicit VLAN membership information within each frame in a 12-bit VID that provides 4094 possible VLAN ID's. IEEE 802.1Q defines the bridging rules for VLANs (ingress and egress rules which are described in detail in "VLAN Operation" later in this chapter).
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