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I-D ACTION:draft-boudani-mpls-multicast-tree-01.txt



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	Title		: An Effective Solution for Multicast Scalability:The 
                          MPLS Multicast Tree (MMT)
	Author(s)	: A. Boudani, B. Cousin
	Filename	: draft-boudani-mpls-multicast-tree-01.txt
	Pages		: 10
	Date		: 03-Jun-02
	
A multicast router should keep forwarding state for every multicast
tree passing through it. The number of forwarding states grows with
the number of groups. In this paper, we present a new approach, the 
MPLS multicast Tree (MMT), which utilizes MPLS LSPs between 
multicast tree branching node routers in order to reduce forwarding 
states and enhance scalability. In our approach only routers that 
are acting as multicast tree branching node routers for a group 
need to keep forwarding state for that group. All other non-
branching node routers simply forward data packets by traffic 
engineered unicast routing using MPLS LSPs. We can deduce that our 
approach can be largely deployed because it uses for multicast 
traffic the same unicast MPLS forwarding scheme. We will briefly 
discuss the multicast scalability problem, related works and 
different techniques for forwarding state reduction. We discuss also
the advantages of our approach, and conclude that it is feasible and
promising. Finally, we analytically evaluate our approach.

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