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What is interVLAN routing?

Learn what interVLAN routing is in this Ask the Expert with routing expert Sudhanshu Gupta.

What is interVLAN routing?

Virtual LANs (VLANs) divide one physical network into multiple broadcast domains. But, VLAN-enabled switches cannot, by themselves, forward traffic across VLAN boundaries. So you need to have routing between these VLANs which is called interVLAN routing. You can achieve this by using either a Layer 3 switch or a router.

Hope this helps.

This was last published in October 2007

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What's the best way to setup a vlan for a external vendor instead of giving them VPN access?
InterVLAN routing allow different VLANs to communicate with others.
Now my question is If we want different VLANs to communicate to each other then why we are creating different VLAN. Why not put all interface in one vlan.Objective of creating different VLANs is that they don't communicate with other.
Well you want different VLAN's assuming you want to organize devices by what department they are in for example (e.g. Sales, engineering). Another reason is for security sake, you don't want a employee in another department getting information from another department. Performance is another reason, a VLAN has it's own broadcast domain and if you have alot of devices in one VLAN, congestion and slower performance on the network can occur. An administration VLAN would be used to connect and manage different VLAN's remotely, so you definitely want inter-VLAN routing for that purpose.
*used to connect to and manage
Why do I need to do Inter-VLAN routing, it is similar to merging two VLANs, so I create one VLAN with members from the two parent VLANs.
Please clear