I have a switched network that is configured throughout using PIM sparse-dence-mode which is also configured for auto RP. There are a number of configured RP groups.
We would like to make sure any unauthorized multicast groups are unable to stream to the network by falling back to and using PIM dence-mode.
I see there is a command no dm-fallback, can I use this command to stop PIM from falling back to DM if there are no RP groups configured?
My concern is that auto RP initially uses PIM DM on start up to advertise the RP group information.
Will the no dm-command still allow the auto RP information to work in PIM DM or is there a better solution. I did read a long time ago about multicast sink holes but I can no longer seem to find out any information on this subject. Any ideas would be appreciated