This variable indicates whether the Agent has its ability to send SNMP traps limited because it has sent 'trapMaxPerWindow' traps during a time period specified by 'trapWindowPeriod'. This method is called the Feedback/Pin technique for limiting traps, and is described in RFC 1224. This method is enabled by setting 'trapControl' to 'feedbackPinLimited'. The value of 'open', indicates that the Agent is allowed to send traps, and is not currently limited. The value of 'closed', indicates that the Agent is currently not allowed to send traps, because of a self-limiting condition. (The Agent sets the value to 'closed' itself). The SNMP user may only write a value of 'open' to this MIB, and only when 'trapControl' is set to 'feedbackPinLimited'. If the SNMP user wants to disable sending traps, then the variable 'trapControl' should be set to 'disabled', which causes this variable to automatically be set to 'closed'. This non-persistent variable is set to an initial value of 'open' whenever the 'trapControl' has a value of 'unLimited' or 'feedbackPinLimited', or whenever an SNMP user sets 'trapControl' to 'feedbackPinLimited'. 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.