Multicast OIL IIF mroute table

In multicast routing:

IIF - incoming interface of a tree, interface towards the root of the tree

OIL - outgoing interface list are a list of interfaces that have received Protocol Independent Multicast (PIM) joins or IGMP membership requests

IIF of the (*,G) tree points to the RP IIF of the (S,G) tree points to a multicast source