Q

Can you tell me a bit about VLANs?

Can you tell me a bit about VLANs?
VLAN's have been around for some time. IEEE 802.1 is the standard that was amended to add interoperability between Virtual Local Area Networks (or sometimes Virtual bridged Local Area Networks).

When you set up a VLAN on your network, you are segmenting computers with frequent traffic patterns into a virtual network of their own. This keeps traffic segmented and does not tie up resources that do not need to see the traffic. This is a means of decreasing the broadcast domain to only those users who need to see the broadcast and therefore decreasing network traffic for those who don't need to see the broadcast information.

For instance, if you have a server on port 1 of a switch in one building and computers on ports 3,4,5 use that server in another, you could set up a VLAN for ports 1,3,4,5 on the two switches. When the server advertises its services it will only got to ports 3,4 and 5. Their traffic is then routed directly between those ports and access is faster due to the decrease in broadcast traffic. It is less expensive to implement than a routed network and throughput is greater. Bandwidth allocation becomes easier with VLAN's as well.

VLAN's also allow you more options for security. Some VLAN implementations are proprietary, so you will want to contact your electronic vendor to determine how to implement it.

This was first published in October 2003

Dig deeper on Managing Virtualization

Pro+

Features

Enjoy the benefits of Pro+ membership, learn more and join.

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

-ADS BY GOOGLE

SearchSDN

SearchEnterpriseWAN

SearchUnifiedCommunications

SearchMobileComputing

SearchDataCenter

SearchITChannel

Close