A conceptual row of cseFlowMcastResultTable, containing
information about an IP multicast layer 3 flow that matchs
the search criteria set in the corresponding row of
cseFlowMcastQueryTable. This row instance is indexed by
the query index (cseFlowMcastQueryIndex), the switch engine
entity (entPhysicalIndex), and data entry index
(cseFlowMcastResultIndex). The value of entPhysicalIndex
object is assigned by Entity-MIB, and uniquely identifies
a switching engine on which the IP multicast flow is stored.