A company's branch location uses redundant routers and links for connectivity to the headquarters. Also, to use the entire available bandwidth, the branch uses a dynamic routing protocol. An…

PIM-BSR is a method for dynamically discovering and announcing the Rendezvous Point (RP) in a PIM-SM domain, not a PIM mode that fundamentally changes the RPF check mechanism to inherently avoid issues with redundant paths for many-to-many traffic.

BIDIR-PIM is specifically designed for many-to-many multicast applications and uses a single shared bidirectional tree rooted at a Rendezvous Point (RP), enabling traffic to flow up and down the tree from any source to any receiver. This model avoids traditional PIM-SM's source-specific RPF checks by using a group-specific RPF check against the RP's address, which makes it well-suited for topologies with multiple redundant paths and active-active routing, preventing RPF failures that might occur with source-specific trees in such designs.

PIM-SM (Sparse Mode) builds source-specific trees (SPT) and shared trees (RPT), and its RPF check is source-specific, which can lead to RPF failures or suboptimal paths in active-active redundant topologies where multiple paths are used by the routing protocol for the same source.

PIM-SSM (Source-Specific Multicast) operates only on source-specific trees (S,G) and requires receivers to explicitly know the source IP address, making it suitable for one-to-many applications but still subject to source-specific RPF checks that can be problematic in designs with redundant, active-active paths.