I have a mostly Cisco network with a 3750 being the primary head before the 7200 router access to the DS3. On that 3750 I have VTP server enabled with 12 VLANs. On the 3750 root switch in the new building and all the 3550s there I have setup for VTP client.
My problem is after I assign more than 12 FE ports to a specific VLAN the next one I add to any VLAN on the same switch I lose all connectivity on the FE ports.
I have not setup interfaces for the VLANs since I'm running static IP for all of the end node machines. I haven't read where that is a problem at least so far.
I don't know a whole lot about VLAN setup other than reading most of what's here on the subject so at this point I'm hoping someone else has experienced the same problem.
Also if configs would help I'll be glad to post them.