Changing switch (c3750) from VTP Ver 2 to 1

[techinneed]

All,

I configured vtp version on a switch incorrectly.  I changed it to VTP Ver 2, and then changed it back to VTP Ver 1.

When I do a sho vtp status:

It still shows me VTP version 2.

Why is this?  Is there any  way for me to change this back to Ver 1?

Thanks all!

[acampbell]

HI,

VTP Version
 
Follow these guidelines when deciding which VTP version to implement:
 
•All switches in a VTP domain must run the same VTP version.
 
•A VTP version 2-capable switch can operate in the same VTP domain as a switch running VTP version 1 if version 2 is disabled on the version 2-capable switch (version 2 is disabled by default).
 
•Do not enable VTP version 2 on a switch unless all of the switches in the same VTP domain are version-2-capable. When you enable version 2 on a switch, all of the version-2-capable switches in the domain enable version 2. If there is a version 1-only switch, it does not exchange VTP information with switches with version 2 enabled.
 
•If there are TrBRF and TrCRF Token Ring networks in your environment, you must enable VTP version 2 for Token Ring VLAN switching to function properly. To run Token Ring and Token Ring-Net, disable VTP version 2.

Also have a look athis paper:-
http://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/98155-tshoot-vlan.html

Regards
Alex

[techinneed]

Thanks Alex.

So basically the answer is no, I cannot change it back to VTP ver 1.  All the other switches are set to VTP ver 1, which is why I wanted to change it back.

I think if I understand your post, I cannot change it back to VTP ver 1.

Is this correct?

[acampbell]

If it is possible can you totally default the switch

3750#erase startup-config

3750#delete vlan.dat

3750#reload

Then apply your config again.

make sure you just use the mode you require e.g.

!
vtp mode client
!
vtp domain YOUR-DOMAIN-NAME
!

One your up and running again you can check the VTP status with

3750#show vtp status

Regards
Alex