This TruthValue object reports whether the local device currently holds the primary-server role for a particular VTP version 3 database type, as opposed to the default secondary-server role. This matters operationally because only the primary server is permitted to initiate or change that database type's configuration across the domain, so knowing which box holds this role tells an admin where authoritative VLAN or MST changes must be made. For example, if this object returns true(1) for the VLAN database type on switch A, the admin knows switch A -- not any other VTP server in the domain -- is the one to log into when new VLANs need to be added domain-wide.