Assume that we are doing inter-domain PIM using MSDP, and we modify PIM as follows. 

When the RP at domain A becomes aware of a source in a domain B, then the RP of A joins the tree of the RP of B (instead of the tree of the source). Will this work in general? If yes argue why, if not show me a scenario where the system will have incorrect behavior.

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Modifying PIM with MSDP Joining RP Tree vs Source Tree Nomodifying PIM as you described will not work in generalWhile it might appear to work in some scenariosit will ultimately lead to incorrect beha... View the full answer