Concept of vlan with advantage

Concept and Advantage of Vlan |In this article we learn about the vlan and the advantage of vlan.

Defination of vlan

Vlan is splitted physical switch to multiple logical switches. Normally switches has one broadcast domain but when we talk about vlan, it can divide one broadcast domain to multiple broadcast damains.As switch has one broadcast domain so by default on switch has one ip subnet but there are multiple ip subnets for vlan because one broadcast domain is splitted into multiple broadcast domains.

We are going through one example:

Suppose in abc organization there is two departments one is hr and another is sales. For security purpose and separate the traffic between two different departments we need to segregate two different lan segments. Switch has one ip subnet so this is not a proper solution and we can not separate the traffic .If we have place one router then we required two different network segments.

In this scenario we have to establish vlan to solve the issue because vlan can splitted one broadcast domain to multiple broadcast domains therefore we got multiple ip subnets on one switch to segregate the traffic for the two different departments.

How to configure vlan

Advantage of vlan

Now we are going to describe the advantage of vlan.

1)security: Users from different departments enters the one hardware switch with different access priviledge when we use vlan and traffic is flowing as per there respective vlan.

2)cost Reduction:

To separate traffic each departments need one switch .If we use vlan we divided one broadcast domain to multiple broadcast domains therefore we get multiple ip subnets to separate the traffic which reduce the cost for purchasing additional hardware.

3)Improvemt Performance:

By default switch has one broadcast domain.When a frame is going to a system and system mac address not registered in mac table of the switch then switch broadcast on all the ports as a result degrades the performance.For vlan broadcast traffic is limited for particular vlan.

Concept Of Vlan

The concept of tunks

When vlan is configured among many switches the interconnection between the switches is called trunk. Different tagged frames are traveled between two switchs using tunks.

Two type of trunks links are there in cisco switch one is ISL link and other is IEEE 802.1Q trunks link.

Concept of native vlan

Native vlan is useful to send untagged frame .Tagged frame sends the traffic for the particular vlan but untagged frame can any traffic not sends traffic for a particular vlan.

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