Multicast: no ip dm-fallback command
I'm consfused by the usage of this command: no ip dm-fallback. My understanding is that dense mode fallback applies to when using spare-dense mode and when there is a group for which there is no known RP - fall back to dense mode.
If you say "no ip dm-fallback" - isn't that just sparse mode? Why would you even have sparse-dense and then say "don't ever use dense".
I'm guessing I'm missing something key here [:)]