Can someone clarify this to me? It is a theory question, so maybe too in-depth but... :)
It is about PIM-SM Register process. When a router directly connected to a multicast source wants to be able to forward traffic, it sends a register message to the RP. This an unicast message, and within it there's a multicast packet encapsulated. Now, if there is no parties interested for this traffic, RP will send back Register-Stop message. Then sending router will start Register Suppression Timer and after it times out, it will send again PIM register. And so on. If there are interested parties, then RP will unpack the encapsulated multicast packet and forward it immediately. Then it should notify the sending router to stop sending unicast packets (which are for registration purposes, basically), because it can send normal multicast ones instead. My question is - how does RP notify the sending router to stop sending unicast PIM Register messages? Is it also PIM Register-stop? But how will the sending router differentiate these two PIM Register messages? How will it know when to start Register Suppression Timer (and keep on sending unicasts), and when to start sending normal multicast packets? Thanks in advance. :) Best Regards, Bojan Zivancevic Network Engineer
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