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I-D ACTION:draft-ietf-manet-ddm-00.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Mobile Ad-hoc Networks Working Group of the IETF.

	Title		: Differential Destination Multicast (DDM) Specification
	Author(s)	: L. Ji, S. Corson
	Filename	: draft-ietf-manet-ddm-00.txt
	Pages		: 21
	Date		: 21-Jul-00
	
This draft describes a multicast routing protocol for mobile ad hoc
networks (MANETs).  The protocol---termed Differential Destination
Multicast (DDM)---differs from common approaches proposed for ad hoc
multicast routing in two ways.  Firstly, instead of distributing
membership control throughout the network, DDM concentrates this
authority at the data sources (i.e.  senders) thereby giving senders
knowledge of group membership.  Secondly, differentially-encoded,
variable-length destination headers are inserted in data packets
which are used in combination with unicast routing tables to forward
multicast packets towards multicast receivers.  Instead of requiring
that multicast forwarding state be stored in participating nodes,
this approach also provides the option of stateless multicasting.
Each node independently has the choice of maintaining cached
forwarding state, or requesting its upstream neighbor to insert this
state into self-routed data packets, or some combination thereof.
The protocol is best suited for use with small multicast groups
operating in dynamic networks of any size.

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