802.1Q - Virtual Bridged Local Area Networks

802.1Q-2003 describes trunking of links that carry multiple VLANs. Replaces nowadays slowly Cisco's propietary ISL (InterSwitch Link).

Adds a "Tag" to each ethernet frame, 4 Bytes (as contrary to 22 Bytes with ISL) to distiguish the different VLANs which cross the link.

http://en.wikipedia.org/wiki/IEEE_802.1Q

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