An entry in the hwDot3ahEfmEventLogTable. Entries are
automatically created whenever Ethernet OAM events occur at
the local OAM entity, and when Event Notification OAMPDUs are
received at the local OAM entity (indicating events have
occurred at the peer OAM entity). The size of the table is
implementation dependent, but when the table becomes full,
older events are automatically deleted to make room for newer
events. The table index hwDot3ahEfmEventLogIndex increments for
each new entry, and when the maximum value is reached the
value restarts at zero.