{
  "number": 5015,
  "title": "Bidirectional Protocol Independent Multicast (BIDIR-PIM)",
  "authors": [
    "M. Handley",
    "I. Kouvelas",
    "T. Speakman",
    "L. Vicisano"
  ],
  "published": "2007-10",
  "status": "Proposed Standard",
  "stream": "IETF",
  "area": "rtg",
  "working_group": "pim",
  "pages": 43,
  "formats": [
    "TXT",
    "HTML"
  ],
  "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]",
  "keywords": [
    "pim",
    "sparse-mode",
    "shared trees"
  ],
  "draft": "draft-ietf-pim-bidir-09",
  "doi": "10.17487/RFC5015",
  "errata_url": "https://www.rfc-editor.org/errata/rfc5015",
  "updated_by": [
    "RFC8736",
    "RFC9436"
  ],
  "urls": {
    "html": "https://rfc.dk/rfc5015/",
    "text": "https://rfc.dk/rfc5015.txt",
    "rfc_editor": "https://www.rfc-editor.org/rfc/rfc5015",
    "datatracker": "https://datatracker.ietf.org/doc/rfc5015/"
  },
  "text_modified": "2007-10-15T18:59:35Z"
}