Creating Multiswitch VLANs Using Trunking
Configuring VLANs on a single switch requires only a little effort: You simply configure each port to tell it the VLAN number to which the port belongs. With multiple switches, you have to consider additional concepts about how to forward traffic between the switches.
When using VLANs in networks that have multiple interconnected switches, which, of course, is typical in a data center LAN, the switches need to use VLAN trunking on the links between the switches. VLAN trunking causes the switches to use a process called VLAN tagging, by which the sending switch adds another header to the frame before sending it over the trunk. This extra trunking header includes a VLAN identifier (VLAN ID) field so that ...
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