The following are some common things to check when troubleshooting problems with VTP:
■ Make sure you are trunking between the switches. VTP is sent only over trunk links.
■ Make sure the domain name matches on both switches. (The name is case sensitive.)
■ If the switch is not updating its database, make sure it is not in transparent mode.
■ If using passwords, make sure they all match. To remove a password, use no vtp password.
■ If VLANs are missing, check the Revision number for a possible database overwrite. Also check the number of VLANs in the domain.
There might be too many VLANs for VTP to update properly.