The operator which is used to operate on the trap receiver table. There are three commands: 1. 'ADD: ipAddress' indicates to add a new entry to the trap receiver list. 2. 'REPLACE: x, ipAddress' indicates to replace the x-th entry in the table with the new settings. 3. 'DELETE:n1, n2' indicates to delete the entries from number n1 to number n2 from the trap receiver table.