Slot associated with address translation. An address translation
not associated with a slot/port pair will have ipNetToMediaSlot
equal to zero and ipNetToMediaPort equal to zero. An address
associated with an Ethernet Management Port (EMP) will have
ipNetToMediaSlot equal to zero and ipNetToMediaPort equal to -1.
An address associated with a link agg port will have ipNetToMediaSlot
equal to zero and ipNetToMediaPort equal to the link agg id.