So this is the 2nd part on how PIM-SM operates. Last time I showed how the initial RPT (shared tree) was constructed, and how data would flow from the source to the receiver. This time, I want to show you how the optimization technique in SM actually works.

I knew it would be tricky before I even started with the multicast section, but not this hard 🙂 So I wrote about PIM-DM and its flooding behavior, and how it would make sure data was flowing from the source to the receivers.