InterfaceId2 in the PM instance acts as a secondary identifying index in cases where the cienaCesPmInstanceInterfaceId object cannot uniquely identify the interface associated with the PM instance. For interfaces which do not utilize this secondary object, the value of this object is zero and unused during new row creation. For interfaces which utilize this secondary object, the value of this object is specific to the interface type. During new row creation, the value of this object may be used along with the cienaCesPmInstanceInterfaceId object value to uniquely identify the interface, and such usage may result in the normalization of the values for this object and the cienaCesPmInstanceInterface object, as evident by subsequent get of this object and the cienaCesPmInstanceInterfaceId object.