Dell Networking OS Trap Alarm MIB.
Dell Networking OS Trap Event MIB allows users to track or to view 
the trap events logged by the system.  There are two types
of trap event tables, hostory trap event table and active
trap event table.

All the traps sent by the system are logged to history trap
event table. The trap that need action will logged to active
trap event table; 'Card down' trap event will go to the active
trap event table, and the trap will be cleared as soon as
'Card Up' event is issued.