Stubby Post – VTP Clients Send Updates

May 17, 2010
By Aaron Conaway

VTP clients send VLAN updates.  Did you know that?

I had a VTP server and client in the same VTP domain, and, when I cabled up the trunk, the client overwrote the VLAN database on the server.

The moral of the story is that the best revision number will win no matter what the operating mode of the switch.

Aaron Conaway

I like to lean my head to the left, hit it with the palm of my right hand, and document what knowledge falls out.

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3 Responses to Stubby Post – VTP Clients Send Updates

  1. René Jorissen on May 18, 2010 at 07:46

    You should look at VTP version 3. This problem is solved in VTP version 3 and you can also distribute VLAN’s above VLAN ID 1024.

  2. Ethan on June 5, 2010 at 17:03

    I haven’t dug into VTPv3 yet. But I will say that I go with VTP transparent mode pretty much my default. You need it for certain things (like private VLANs I believe), and the annoying behavior from VTP clients as you mentioned make transparent mode a safe choice…not the most convenient, but safe from my perspective.

  3. Aaron Conaway on June 7, 2010 at 12:24

    Unless you have 83024989 switches all in the same VTP domain, one should probably just stay with transparent. After all, the new Cisco network models want to keep the VLANs locally significant, so propagating a VLAN elsewhere is no longer the way to go. I would guess VTP would be dead soon.

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