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Tag-based VLAN (IEEE 802.1Q VLAN)
Tag-based VLAN is an IEEE 802.1Q specification standard. Therefore, it is possible to
create a VLAN across devices from different switch vendors. IEEE 802.1Q VLAN uses a
technique to insert a “tag” into the Ethernet frames. Tags contain a VLAN Identifier (VID)
that indicates the VLAN numbers.
Protocol-based VLAN
In order for an end station to send packets to different VLANs, it must either itself be
capable of tagging packets it sends with VLAN tags or be attached to a VLAN-aware bridge
that is capable of classifying and tagging the packet with different VLAN IDs based not only
on default PVID but also on other information about the packet, such as the protocol. The
switch will support protocol-based VLAN classification by means of both, built-in
knowledge of Layer 2 packet formats used by selected popular protocols, such as Novell IPX
and AppleTalk’s EtherTalk, and some degree of programmable protocol matching capability.
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