Multicast: no ip dm-fallback command

Hello All,

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 [:)]

Thanks!

Comments

  • That command stops a sparse multicast group from falling down to dense mode group once a RP for that group is lost. Obviously this is only an issue if you'r running sparse-dense mode on your interfaces. This command will stop  multicast flooding for traffic that's suppose to run in sparse mode only.

    Why would you even have sparse-dense and then say "don't ever use dense".

    Because you don't want to run specific groups in dense mode.

     

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