in the Multicase Configuration lab, topology is R2 -- R4--- R1, R2 is RP and mapping agent, all routers' interfaces are in PIM sparse mode.according to docs, when R4 receives 224.0.1.40 traffic, it won't pass it to R1, the solution is config PIM auotp listener on R4, so R4 can flood 224.0.1.40 to R1. However, in my lab, why without PIM auotp listener command on any router, R1 still receive 224.0.1.40 and get correct RP mapping? as I said, NO any interface is in sparse-dense mode, all are in spare mode. Thanks Jason
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