Teflon is correct. If you configure your network to use Auto-RP, then all of your interfaces will have to use PIM Sparse-Dense Mode. Besides the fact that Auto-RP uses dense mode for it's control data, if any router looses connectivity to the RP, then it would fall back to flood-and-prune. To me Auto-RP and BSR is too much overhead for the advantage gain. I would configure several RP and use Anycast/MSDP with that. Next I would configure static RP on all of my routers.
The advantages providing that your RP address doesn't change is, it makes RP-to-group mapping a much more simpler process to understand and implement. The convergence time will be so much faster because your convergence will be only as fast as your unicast route convergence. The average convergence time with Auto_RP is around 30ish seconds. BSR is a bit faster, but then again only 1 BSR can advertise RP out at a time and the rest are stand-by BSR. Imagine if you have a 500+ network that gets the RP information from only 1 BSR router. OR if you're using Auto-RP, imagine the flood-and-prune process. To me if you have to configure multicast on every router, I don't think adding an extra line for static RP is too much more to do. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=73685&t=73108 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
