@alienghic @ohir @Andres4NY @KathyReid Multicast routing is complicated even just for a small ISP or carrier network topology. I have the luck of having to refactor a C++ implementation written by one of the original instigators of the first PIM-SM at USC in the USA. I was in fact reading what development documentation he'd managed to write for it this very evening. He now works for Google so he's probably not able to assist freely. We worked on the same team in the 00s and I have not seen him