Bidirectional Protocol Independent Multicast (BIDIR-PIM)
RFC 5015

Approval announcement
Draft of message to be sent after approval:

From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce <ietf-announce@ietf.org>
Cc: Internet Architecture Board <iab@iab.org>,
    RFC Editor <rfc-editor@rfc-editor.org>, 
    pim mailing list <pim@ietf.org>, 
    pim chair <pim-chairs@tools.ietf.org>
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.