IP multicast sends an Internet Protocol datagram to a group identified by a multicast IP address. Delivery retains the underlying best-effort nature of Internet Protocol.
Multicast routing establishes and maintains the forwarding decisions that deliver group-addressed packets to interested receivers.
Reverse path forwarding accepts a source's multicast traffic only on the interface selected for the reverse route to that source. With consistent loop-free routing, those parent choices define a source-rooted tree. Membership pruning can then remove unneeded branches.
A multicast distribution tree describes the parent and outgoing branches used to distribute packets to a group. Source-rooted and shared-group designs make different state and path choices.

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