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inter vlan communication

absalax asked
Last Modified: 2009-06-11

It is common saying that you must have a router or layer 3 switch for inter vlan communication.
I would like to clarify this because I am kind of confused about the role of trunks between switches that have multiple vlans and all users connected to the switches are on the same ip subnet.

For example
say I have switch A and B connected to switch C through TRUNK links and all three switches have both vlan 2 and vlan 3.  Also all user computers connected to all the switches are in the same ip subnet.  Do I still need routing(router or L3 switch) to get the computers on different VLANs to communicate?

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a VLAN is a separate network. You need some sort of routing to make it work, most layer 2/3 swtiches that support VLANS's are going to support routing.
Top Expert 2004
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hi pseudocyber,

thanks for the explanation. Does that mean that I can't possibly have all the PCs in the same subnet. I am planning on using one Windows server: DHCP server with one subnet for all my PCs. How do I deal with that.

Top Expert 2004

Sure you can have all the PC's on the same subnet - just put them in the same vlan.  But if you want to put other computers in the other vlan, and you want the two vlans to communicate - you would need a router or a layer 3 switch.
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