The management name of a domain in which the local system
is participating. The zero-length name corresponds to the
'no management-domain' state which is the initial value at
installation-time if not configured otherwise. Note that
the zero-length name does not correspond to an operational
management domain, and a device does not send VTP
advertisements while in the 'no management-domain' state. A
device leaves the 'no management-domain' state when it
obtains a management-domain name, either through
configuration or through inheriting the management-domain
name from a received VTP advertisement.
When the value of an existing instance of this object is
modified by network management, the local system should re-
initialize its VLAN information (for the given management
domain) as if it had just been configured with a management
domain name at installation time.