Bidirectional Protocol Independent Multicast (BIDIR-PIM)
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Internet Architecture Board <firstname.lastname@example.org>, RFC Editor <email@example.com>, pim mailing list <firstname.lastname@example.org>, pim chair <email@example.com> Subject: Protocol Action: 'Bi-directional Protocol Independent Multicast (BIDIR-PIM)' to Proposed Standard The IESG has approved the following document: - 'Bi-directional Protocol Independent Multicast (BIDIR-PIM) ' <draft-ietf-pim-bidir-10.txt> as a Proposed Standard This document is the product of the Protocol Independent Multicast Working Group. The IESG contact persons are Bill Fenner and Ross Callon. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-pim-bidir-10.txt
Technical Summary This document discusses Bi-directional PIM, a variant of PIM Sparse-Mode that builds bi-directional shared trees connecting multicast sources and receivers. Bi-directional 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 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. Working Group Summary The WG had consensus to advance this document. Work was completed in 2004-2005, but this document waited for the PIM-SM spec, which is now published as RFC 4601. Protocol Quality Bill Fenner reviewed the spec for the IESG.