Description: This document discusses Bidirectional PIM (BIDIR-PIM), a variant of
PIM Sparse-Mode that builds bidirectional shared trees connecting
multicast sources and receivers. Bidirectional trees are built using
a fail-safe Designated Forwarder (DF) election mechanism operating on
each link of a multicast topology. With the assistance of the DF,
multicast data is natively forwarded from sources to the Rendezvous-
Point (RP) and hence along the shared tree to receivers without
requiring source-specific state. The DF election takes place at RP
discovery time and provides the route to the RP, thus eliminating the
requirement for data-driven protocol events.
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