set vtp password to existing vtp domain

in CCNP
50 switches all in the same vtp domain with no vtp password
2 vtp servers
48 vtp clients
What happens when I add a vtp password to the vtp servers?
Do I lose all vlans on clients or do they not receive updates until they have the correct password?
2 vtp servers
48 vtp clients
What happens when I add a vtp password to the vtp servers?
Do I lose all vlans on clients or do they not receive updates until they have the correct password?
Comments
HTH