By default, SNMP is disabled on the SonicWall Security Appliance. To enable SNMP, you must first enable SNMP on the Device | Settings > SNMP page, and then enable it for individual interfaces. To do this, go to the NETWORK |System > Interfaces page and edit the interface to enable SNMP. For more information about configuring SNMP as a service and adding rules, see Configuring Interfaces section in the SonicOS 7.0 System document.
If your SNMP management system supports discovery, the SonicWall Security Appliance agent automatically discovers the SonicWall Security Appliance on the network. Otherwise, you must add the SonicWall Security Appliance to the list of SNMP-managed devices on the SNMP management system.