When you add an SnmpNetwork object, a Local Device component comes with it.
Enabled property should be set to true. If not, tick the option to true.Snmp Receive Requests property to Enabled (can send traps). This allows the Local Device to receive outside request messages from external Snmp sources and to send trap messages.

You are now ready to add Snmp Agent Points under the Local Device in order to expose the data to Snmp requests from outside sources.