This variable counts the number of occurrences of events that have an associated SNMP trap, and no trap was sent due to the 'trapMgrControl' filters, or the 'trapMgrTable' contained no valid IP address of trap managers in the variable 'trapMgrAddress'. This counter represents these occurrences since the date and time specified by 'trapClearDate'. This non-persistent variable is set to 0 whenever the Network Management Unit, or NMU, processor is reset. This counter can be cleared by setting 'trapClearDate'. The Agent determines if a trap can be sent by examining several controls (or filters), all of which enable the sending of the trap. These are described in their order of checking below: One, the MIB variable that enables that specific trap to be sent is enabled. (Each trap can be selectively enabled or disabled.) If a trap is not sent due to this filter, then 'trapFilteredSpecific' is incremented. Two, the MIB 'trapControl', is set to 'unLimited'; or, it is set to 'feedbackPinLimited' and 'trapFlow' is set to 'open'. If a trap is not sent due to this filter, then 'trapFilteredControl' is incremented. Three, one or more trap managers must be defined in the table 'trapMgrTable' with a valid IP address in 'trapMgrTable.trapMgrAddress', and their control variable 'trapMgrTable.trapMgrControl' must be configured to 1) 'both' or 'standard' and the trap is a standard trap; or 2) 'enterprise' or 'both', and the trap is an enterprise trap. If a trap is not sent due to this filter, then 'trapFilteredManager' is incremented. Four, the trap has no associated severity level, or the severity level of the trap is equal or higher than the value specified by the severity filter 'trapSeverityFilter'. If a trap is not sent due to this filter, then 'trapFilteredSeverity' is incremented.