Sparse-mode PIM: optimized for environments where there are many multipoint data streams with each data stream goes to a relatively small number of the LANs in the internetwork.
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Reverse Path Forwarding wastes bandwidth for such traffic pattern.
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Sparse-mode PIM works by defining a Rendezvous Point. Senders send data to and the receivers receive data from the Rendezvous Point. .
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For each data stream the routers in the path will optimize the path automatically to remove any unnecessary hops.
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Sparse-mode PIM assumes that no hosts want the multicast traffic unless they specifically ask for it.
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