When read, this object always returns the value of a
zero-length octet string.
In the case that the VTP password is hidden from the
configuration and the local device intends
to take over the whole domain, this object must be
set to the matching password with the secret key
(vtpAuthSecretKey) in the same data packet as which
the vtpDatabaseTakeOverPrimary is in. In all the
other situations, setting a valid value to this object
has no impact on the system.