Description: The type of mapping. Setting this object to the value invalid(2) has the effect of invalidating the corresponding entry in the xfrArpEntryTable. That is, it effectively disassociates the interface identified with said entry from the mapping identified with said entry. It is an implementation- specific matter as to whether the agent removes an invalidated entry from the table. Accordingly, management stations must be prepared to receive tabular information from agents that corresponds to entries not currently in use. Proper interpretation of such entries requires examination of the relevant xfrArpEntryType object.