The Enterprise Manager (EM) is setup to notify a remote application via SNMP traps. The traps are received, but the OID identifier for the EM (126.96.36.199.4.1.10480.1.1.xxxx - where xxxx is the identifier for the EM) changes whenever the EM is restarted. As a result, it is impossible to determine which EM is sending the trap in a multi-EM environment.
The OID for the EM is saved in an xml file in the folder <EM_HOME>/config/internal/server/snmp. When it is not present (which can occur when a MIB is not published), the EM's OID is randomly recreated when the EM is restarted.
EM setup to send SNMP traps for all supported APM releases.
This problem can be fixed by generating a MIB file. To create a MIB file: