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All devices are setup for SNMPv3, but SNMPv2 traps alerts are being sent by multiple devices intermittently. Checking the Trap Viewer you will see the rule and the condition is when SNMPv2 OID is equal to snmpTRAPOID= SNMPv2-MIB:authentication failure.
All NCM versions
NCM Inventory Settings is enabled and sending the SNMPv2 request causing the traps to fire.
Go to NCM Settings > Inventory Settings and select "Disable inventory lookup".