An entry in the table, containing information on the Ethernet
OAM function for a single Ethernet like interface. Entries in
the table are created automatically for each interface
supporting Ethernet OAM. The status of the row entry can be
determined from hwDot3ahEfmOperStatus.
A hwDot3ahEfmEntry is indexed in the hwDot3ahEfmTable by the ifIndex
object of the Interfaces MIB.