Did you try it from global config mode , "no vtp domain ? If it is a new switch then it should be done from global config mode not the old vlan database . I would just leave it as null , its not hurting anything like that .
There is no way of doing that in CatOS. That has been done on purpose. The idea was that the null domain was a particular one where the switch was "gleaning" a domain name from the network. When you are in this condition, you cannot configure anything VTP related. Once you have a domain and an associated configuration, you can't go back to the NULL domain without releasing the VTP configuration. Now, the problem is that you cannot clear the VTP configuration without clearing the whole switch configuration. There has been an enhancement bug open for that (so that we could clear the VTP config without altering the rest of the config) but it was not committed into the code, probably because of lack of interest for the feature.
CatOS is behaving the way VTP was originally designed. IOS is behaving differently, and allows you to configure VTP in null domain and clear the domain name. One bad consequence of that (I think), is that you can run your network in the null domain and then suddently lose all your config if a bridge with a domain configured is inserted in the network. This because a bridge in NULL domain is in this gleaning mode. That's not very nice obviously... Note that I'm not very knowledgeable about VTP in IOS and this may have been somehow fixed.
Thanks very much for the detailed answer. That is exactly what I wanted to know - it can't be done without resetting all VTP parameters. This is not a problem in our environment - it's just that another experienced engineer and I were completely focused on accomplishing this minor task and we couldn't do it.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...