You can configure passive monitors two ways:
The Trap Definition Import Tool allows you to search for the specific SNMP trap for which you want WhatsUp Gold to listen, and then import that trap into the Passive Monitor Library. After you import the trap, you can make specifications to the passive monitor in the Passive Monitor Library using the Rules Expression Editor dialog. For example, if you want WhatsUp Gold to monitor when a specific IP address causes an authentication failure on your SNMP-enabled device, you would create a rule that tells WhatsUp Gold to log an event only when that particular IP address attempts to access the SNMP-enabled device.
While using the Trap Definition Import Tool or any of the pre-configured passive monitors are two easy ways to configure SNMP Trap passive monitors, you still have the option to manually configure all passive monitor types via the Passive Monitor Library.