In case of multicast routing, I encountered source based tree and shared cost based tree.What is the difference between source based tree and shared core based tree? In which case they are used? what is reverse path forwading and how is it used?

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    You need to provide more context... bear in mind that programming questions are off-topic here, and should be asked on Stack Overflow. – Craig Constantine Feb 19 '16 at 13:07
  • Did any answer help you? if so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer. – Ron Maupin Aug 7 '17 at 19:18

Source-based tree: A non-shared multicast distribution tree (forwarding/replication state on intermediate routers) is built for every SOURCE,GROUP pair. Source-based tree is unidirectional.

Shared tree: A per-group multicast distribution tree is built on routers, shared by all group's senders and receivers. The shared tree might be bidirectional.

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