I have 20 C4500 series , all with trunks and joined to a VTP domain.
What happens if I want to set a password on teh VTP domain and I start with the Server?
Except teh fact that advertsiements will not be received by teh rest of the switches until they have a pssword also, what would be the impact?
it takes some time but you should be able to do it without impact.
the client switch doesn't delete the learned vlans, and when it accepts again the VTP messages originated by server there shouldn't be any impact.
Hope to help