I thought this would be very straight forward, but I guess not.
Currently the network I manage consists of 3 main sections with two 6500's for the dist layer, in each section, which in turn, have layer 3 connections to a set of 6500's acting as the core.
I inherited this network, and the person before me allowed layer 2 connections to span into the different sections and the entire building is one large VTP domain.
Because of the number of VLAN's on the network, I need to limit the scope of spanning tree and remove any unused VLAN's from the sections.
I have configured all the trunk ports to 'nonegotiate', to turn of DTP, but when I change the domain on the access layer (2960's), I loose connectivity to the servers behind the access switch, but still have connectivity the management VLAN.
I'm assuming I'm missing some sort of configuration on the 6500, so if anyone can point me in the right direction, that would be great.
Ensure that you have VTP pruning turned off on the VTP Servers. If pruning is on and you change the VTP domain the client switches will not be able to tell the VTP server which VLANs it is currently using. And because VLAN 1 can NEVER be removed from a trunk, it remains up.
So if you need to change the VTP domain on a section of switches, ensure that you turn off DTP and VTP Pruning.
switchtower and I figured this out today after racking our brains.