PIM-SM uses a pull model (or “explicit join” model) that does not rely on flooding traffic. While PIM-DM uses only Source-based Trees, PIM-SM uses a combination of Shared Trees and Source-based Trees. This makes Sparse Mode much more scalable compared to Dense Mode. Sparse Mode will choose to use a Shared Tree approach if it is more efficient to use the RP concept and will use a Source-based Tree approach if it is more efficient. Overall, Sparse Mode is more efficient, even when there is a dense distribution of multicast receivers.
In Sparse Mode . . .
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