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I-D ACTION:draft-ietf-pim-bidir-04.txt,.ps

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Protocol Independent Multicast Working Group of the IETF.

	Title		: Bi-directional Protocol Independent Multicast 
	Author(s)	: M. Handley, I. Kouvelas, T. Speakman, L. Vicisano
	Filename	: draft-ietf-pim-bidir-04.txt,.ps
	Pages		: 40
	Date		: 28-Jun-02
This document discusses Bi-directional PIM, a variant of PIM
Sparse-Mode [9] 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 a default route to the RP thus
eliminating the requirement for data-driven protocol events.

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