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In order to integrate legacy devices, there is a common approach to implement an adapter or mediator software, This software usually runs in a data-center and provides northbound the target interface and data modules and consumes on the southbound side legacy protocols and data models.

In cases where the legacy management protocol bases on UDP, there is a good chance that important notifications are not forward to ONAP, because the UDP packet gets lost. 

It happens for sure, in case of in-band management, for alarms indicating traffic errors. 

Due to the fact that such connection loss can not be detected by SDN-R, there should be a polling mechanism implemented to request all air-interface problem list every 120s - this is possible for ONF-CoreModel 1.2, as the expected deployed NetConf devices/mediators are quite limited. 

In the target architecture using another version of the ONF-CoreModel or other fault management modules (e.g. ietf-alarms) - the workaround would not apply, because the OAM connection would be detected by SDN-R and the normal alarm synchronization process would take place.