<MPLS> <draft-boudani-mpls-multicast-tree-00.txt>

[Ali Boudani <aboudani@irisa.fr>]

NAME OF I-D:

http://www.ietf.org/internet-drafts/draft-boudani-mpls-multicast-tree-00.txt

SUMMARY

   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.

RELATED DOCUMENTS

 [1] J. Tian et al., Forwarding state reduction for sparse mode
multicast
    Communication,Proceedings of IEEE INFOCOM, MArch 1998.

[2] P. Radoslavov et al., Exploiting the bandwidth-memory tradeoff in
    multicast state aggregation, Technical report, USC Dept. of CS
    Technical Report 99-697, july 1999.

[3]  R. Boivie et al., Explicit Multicast (Xcast) Basic Specification,
     Internet draft, 2000.

[4]  A. Boudani et al., Simple Explicit Multicast(SEM),
      Internet draft, 2001.

[5]  I. Stoica, et al., "REUNITE: A recursive Unicast Approach to
     Multicast", http://www.ieee-infocom.org/2000/papers/613.ps.

[6] D. Ooms et al., Framework for IP multicast in MPLS, Internet draft,
    december 2000

[7] D. Farinacci et al., Using PIM to distribute MPLS labels for
    multicast routes, Internet draft, november 2000

[8] A. Fei and al., Aggregated multicast: an approach to reduce
    multicast state, UCLA CSD Technical Report #010012, June 2001

[9] Multiprotocol label switching architecture, RFC3031, January 2001.

[10] http://ardnoc41.canet2.net/mpls/drafts/index.html.

[11] E. Rosen et al., MPLS label stack encoding, RFC3032, January 2001.

WHERE DOES IT FIT IN THE PICTURE OF THE SUB-IP WORK

It is an MPLS draft.

WHY IS IT TARGETED AT THIS WG

It describe a new way to use an MPLS network for multicast traffic.

JUSTIFICATION

It enter into the goals of the MPLS Wg about completing the work in
progress for specifying the framework for IP multicast over label
switched paths.