What is AMFI (AMF identifier)?

AMFI is an Access and Mobility management identifier which is constructed from AMF Region ID, an AMF set ID, and an AMF pointer. The AMF Region ID identifies the region, the AMF set ID uniquely identifies the AMF set within the AMF region and the AMF pointer identifies one or more AMFs within the AMF set. As a mobile network comprises many AMF instances, a Globally unique AMF identifier (GUAMI) is employed to identify AMF identifiers.