So I tried to document a potential pitfall with layer 3 #multicast routing, with #PIM in particular, here: https://wiki.dn42.dev/howto/pim-multicast-vs-unicast-issue
The issue of multicast potentially being black holed if the unicast topology is larger than the potential multicast one. I'm wondering how other people tackle or avoid this or if I'm missing an easy solution.
(I'm wondering if maybe @troglobit or @dentangle might have some ideas?)