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Should we always use VTP domain configuration for VLAN syncing or not

Posted on 2013-01-28
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Last Modified: 2013-01-30
We have 2 Core switches (6509 & 4506) that are member of same VTP domain

Please find attached sh vtp stat for both switches

we are setting up a new Hub area for a new floor.

Should join the new switch stack (3750) to existing VTP domain to let VLANs sync properly or configure switchports to use VLAN ID only and do "vtp mode Off" so no un-necessary VLANs travers to this new stack?
sh-vtp.txt
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Question by:sysprof
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by:rharland2009
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It'll be easier to join your new switch to the VTP domain, especially if you're not positive about what its uses will be over the years. VTP is mostly an administrative apparatus. I'll always use it where possible/secure/logical. Plus, I only have to add vlans in one place.
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by:Akinsd
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Turning it off may not be bad but I'd rather  configure the new switch in transparent mode OR configure allowed vlans on the switchport

VTP mode transparent.
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Leeeee earned 100 total points
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Let's say you connect a Cisco switch that for some reason has a higher VTP revision number that has been configured to join the VTP domain, the switch will wipe out all the configured VLANs on the other switches if configured as VTP server. Like mentioned above, configure the 3750 as a VTP transparent switch or make sure the revision number is lower than the VTP server.
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by:rauenpc
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My general rule of thumb is to always enable transparent mode, and then whatever mode you're going to go with. This change of modes are built in to my config templates. This is done for the reason that Leeeee mentioned.

I have a separate VTP domain for each L3 segment. So say you have two sites, and each has an L3 core and numerous L2/3 switches below it, then I would configure two different VTP domains otherwise you may end up with dozens of unused vlans at each site eating up processing power due to spanning-tree. Also, any VTP meltdowns would be limited to a single site.
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by:Don Johnston
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Adding on...

I am a big advocate of "Just say no to VTP". The gain is simply miniscule.  None of the arguments in favor of VTP that I've heard over the years are compelling enough.

I heard a good one the other day:  VTP - Very Terrifying Protocol :-)
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