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New Member

VTP domains across routers

Can a VTP domain be seen across a router with a switch on either side?

  • Other Network Infrastructure Subjects
4 REPLIES
New Member

Re: VTP domains across routers

VTP uses VLAN 1. If VLAN 1 can cross the router then VTP can cross.

New Member

Re: VTP domains across routers

Hi.

Sorry but you are wrong. VTP is a layer 2 protocol which runs on VLAN 1 as you said, but VTP messages are sent to the address 01000ccccccc which is processed by switches and not by routers, unless the router is working as a bridge, which in that case will forward VTP frames across its interfaces. Routers, as layer 3 devices, break VTP domains as Jackson said. If you have a router between two switches you will need two separate VTP domains.

Rgds.

NM

New Member

Re: VTP domains across routers

You are correct of course. I was thinking one thing and typing another.

New Member

Re: VTP domains across routers

VTP will ONLY communicate via trunk ports, so therefore you will have to setup 2 VTP domains if there is a router separating the two switches.

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