Complex sentence: MSDP interconnects multiple IPv4 PIM Sparse-Mode (PIM-SM) domains which enables PIM-SM to have Rendezvous Point (RP) redundancy and inter-domain multicasting.
Split into simpler sentences: MSDP interconnects multiple IPv4 PIM Sparse-Mode (PIM-SM) domains. This enables PIM-SM to have Rendezvous Point (RP) redundancy and inter-domain multicasting.