Protocol-based VLANs
With protocol-based VLAN membership, computers are assigned to VLANs by using the protocol that is in use and the Layer 3 address. For example, this method enables an Internetwork Packet Exchange (IPX) network or a particular Internet Protocol (IP) subnet to have its own VLAN.
It is important to note that although VLAN membership might be based on Layer 3 information, this has nothing to do with routing or routing functions. The IP numbers are used only to determine the membership in a particular VLANnot to determine routing.