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VLAN Trunking Protocol versus Foundry Switches?

Posted on 2007-12-05
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Hello

Question:

Will Cisco switches runing VTP ( VLAN Trunking Protocol ) have any adverse effect on Foundry switches in the same subnet?  And/or is it possbile to pass VTP through a foundry switch to a Cisco switch on the other side of the Foundry switch.

Background:
We have a large flat single subnet that was formerly all foundry.  For reasons that shall not be mentioned here(no politics please) the choice was made to forklift the enviroment to Cisco.  We have been steadily been replacing access layer switches with Cisco 3560's(we have no distribution layer).  And in a few weeks we are going to replace half of our core with some Cisco 6500's.  At that time it is our intent to VLAN *some* of the enviroment using the 6500 as a layer 3 switch, we would like to run VTP to manage the VLANs across the cisco gear however we still have some Foundry in our enviroment that is going to be connected.  We dont know what it going to happen with the foundry sees VTP packets from the Cisco 6500.  Also we have a few Cisco switches that cant directly connect to the 6500's and are behind some Foundry switches.  Can VTP pass through the Foundry portion of the enviroment to get to those switches and populate their VLANs?  Or should we forego the idea of VTP alltogether and just do all the VLANs manually till we are pure Cisco?

thanks in advance.

Eric
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Question by:Eric-arup
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Don Johnston earned 500 total points
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>Will Cisco switches runing VTP ( VLAN Trunking Protocol ) have any adverse effect on Foundry switches in the same subnet?  

No. VTP is Cisco proprietary. It is possible for Cisco to license the VTP code to another vendor, but I haven't heard of anyone else running VTP.

>is it possbile to pass VTP through a foundry switch to a Cisco switch on the other side of the Foundry switch.

Yes. VTP messages are sent to a multicast address. So any Cisco switches connected to the Foudry switch will receive the VTP frames.

Personally, I'm not a big fan of VTP. If it were me, I'd put the Cisco switches in transparent mode and manage the VLAN database manually.
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by:Eric-arup
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Perfect, thank you.

May I ask why you dont like VTP?
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