VLANs Basics

Sunday, April 5, 2009

VLANs are broadcast domains in a Layer 2 network. Each broadcast domain is like a distinct virtual bridge within the switch. Each virtual bridge you create in a switch defines a broadcast domain. By default, traffic from one VLAN cannot pass to another VLAN. Each of the users in a VLAN is also in the same IP subnet, and each switch port can belong to only one VLAN.The three characteristics of a typical VLAN setup are:

Each logical VLAN is like a separate physical bridge.
VLANs can span multiple switches.
Trunks carry traffic for multiple VLANs.
By default, each port on a switch can belong to only one VLAN. For devices that are in VLANs (that span multiple switches) to talk to other devices in the same VLAN, you must use trunking or have a dedicated port per VLAN. Trunk links allow the switch to carry multiple VLANs across a single link.


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