The administrative state of DVMRP on this interface.
When the status of this object is set to 'adminStatusDown', no
DVMRP messages will be sent or received on this interface. The
TIB state pertaining to this interface is cleared, resulting in
the removal of the associated routes from the MFIB.
When the status of this object is set to 'adminStatusUp', normal
DVMRP operation will proceed, and multicast state is stored in
the TIB when it is learned.