Introduction to VLAN

Before you start

Objectives : You will be able to understand VLAN concept.

Prerequisites: You have to know the basic of Networking..

Tags : VLAN, VLAN ID, VTP

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VLAN

VLAN stands for Virtual Local Area Network. Practically every Enterprise arrange today utilizes the idea of virtual LANs (VLAN). Before understanding VLANs, you should have a certain comprehension of the meaning of a LAN. In spite of the fact that you can consider and characterize the expression "LAN" from numerous points of view, one viewpoint specifically will enable you to comprehend VLANs: A LAN consists of all devices in the same broadcast domain, Without VLANs, a switch thinks about all interfaces on the change to be in a similar communicated area. At the end of the day, every single associated gadget are in a similar LAN. (Switches achieve this by putting all interfaces in VLAN 1 of course.) With VLANs, a switch can put a few interfaces into one communicate area and some into another in view of some straightforward design. Basically, the switch makes numerous communicate spaces by putting a few interfaces into one VLAN and different interfaces into different VLANs. These individual communicate spaces made by the switch are called virtual LANs. In this way, rather than all ports on a switch shaping a solitary communicate space, the switch isolates them into many, in light of design. It's extremely that straightforward.

Configuration of VLAN:

Configure VLAN on CISCO Switch

configure terminal
vlan 10
name VLAN_OFFICE_1
exit
vlan 20
name VLAN_OFFICE_2
exit

Adding Interfaces to particular VLAN

configure terminal
interface FastEthernet 0/1
switchport mode access
switchport access vlan 10

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