A tmnxDot3OamSdEventLogEntry is automatically created whenever SD threshold crossing events occur at the local OAM entity, and when Event Notification OAMPDUs are received at the local OAM entity (indicating that events of this nature 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 tmnxDot3OamSdEventLogIndex increments for each new entry, and when the maximum value is reached, the value restarts at zero.