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VLAN Tagging is IEEE standard 802.1Q for supporting multiple VLANs associated with the same switch port. Each VLAN is tagged with a unique identifier to allow the identification of different VLAN traffic on the same physical port.VLAN Tagging provides an indication in the Layer 2 header by which a switch decides through which port to connect to the VLAN on another switch. When two VLANs are configured across two different switches, usually there is a connection between each of the VLANs on one switch to the corresponding VLAN on a second switch. This is done by a single cable connecting the two switches. The ports that interconnect the switches, for example port 10 on each switch, belong to all of the VLANs on that switch. In this case, the switch needs to know to which VLAN to send traffic coming from port 10, as this port belongs to all the VLANs.
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