@misc{rfc5015,
    series =    {Request for Comments},
    number =    5015,
    howpublished =  {RFC 5015},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC5015},
    url =       {https://www.rfc-editor.org/info/rfc5015},
    author =    {Tony Speakman and Lorenzo Vicisano and Mark J. Handley and Isidor Kouvelas},
    title =     {{Bidirectional Protocol Independent Multicast (BIDIR-PIM)}},
    pagetotal = 43,
    year =      2007,
    month =     oct,
    abstract =  {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. {[}STANDARDS-TRACK{]}},
}