U2000 manage the N2510 alarms and U2000 works as Third-party NMS.
U2000 can’t support to receive the alarm via SNMP as third-party NMS.
You need to use their own NMS to receive the alarm. SNMP of N2510:
If you need to develop the NMS to connect the N2510, please see the document. The U2000 cannot receive the alarm from N2510 via SNMP, though the configuration is very right.