Are there any scenarios where it is possible that Auto RP will not be
able to distribute the group to RP mappings utilizing sparse-mode, ip
pim autorp listener to all the necessary routers as BSR could? The
solution for IEWB Lab19 Sec 6.1 utilizes BSR, I didn't see any
indication why Auto RP could not be used, however I wasn't able to get
the Group to RP mappings propogated to R4. I don't see any indications
of RPF failures to the MA/RP. I'm at a loss why Auto RP will not achieve
the desired goal. Thoughts are appreciated.