TRAP CONTROL SYSTEM

A manager issues a trap entry demand containing a self-address and effective time to an agent to be monitored, for entry therein, and issues a release demand or a time extension demand in response to a release validation demand. An agent receives a trap entry demand from the manager and enters an address of an object of trap and effective time into a database. Upon the occurrence of trap the agent refers to the database to issue a trap to a manager entered as the object of trap. When the effective time expires, the agent issues a release validation command. Receipt of a release demand as the response allows the agent to delete the entry of the object of trap. Receipt of a time extension demand allows it to update the effective time.