Classifying multiple protocols into a single VLAN often imposes VLAN boundaries that are inappropriate for some of the protocols, requiring the presence of a non-standard entity to relay between VLANs the frames bearing the protocols for which the VLAN boundaries are inappropriate. The non-standard relay makes the boundaries of the VLANs transparent to the relayed protocols, depriving those protocols of the benefits of VLANs. The proposed supplement will benefit users of multi-protocol LANs by permitting them to specify VLAN structures suitable for each protocol present in a LAN, and removing the need for a non-standard relay function between VLANs.
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