The status of the entry. Setting the value of a non-existent
instance of this object to valid(1) attempts to add the
corresponding entry to the table. The effect of adding an
entry to the table is to configure the port for monitoring and
to disable it for switching. Setting an existing instance of
this object to invalid(2) attempts to remove the corresponding
entry from the table. The effect of removing an entry from
the table is to disable the port for monitoring and to make
available for switching.