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Avoidance of multicast incapable branching nodes for multicast routing in WDM networks

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Abstract

In this article we study the multicast routing problem in all-optical WDM networks under the spare light splitting constraint. To implement a multicast session, several light-trees may have to be used due to the limited fanouts of network nodes. Although many multicast routing algorithms have been proposed in order to reduce the total number of wavelength channels used (total cost) for a multicast session, the maximum number of wavelengths required in one fiber link (link stress) and the end-to-end delay are two parameters which are not always taken into consideration. It is known that the shortest path tree (SPT) results in the optimal end-to-end delay, but it can not be employed directly for multicast routing in sparse light splitting WDM networks. Hence, we propose a novel wavelength routing algorithm which tries to avoid the multicast incapable branching nodes (MIBs, branching nodes without splitting capability) in the shortest-path-based multicast tree to diminish the link stress. Good parts of the shortest-path-tree are retained by the algorithm to reduce the end-to-end delay. The algorithm consists of tree steps: (1) a DijkstraPro algorithm with priority assignment and node adoption is introduced to produce a SPT with up to 38% fewer MIB nodes in the NSF topology and 46% fewer MIB nodes in the USA Longhaul topology, (2) critical articulation and deepest branch heuristics are used to process the MIB nodes, (3) a distance-based light-tree reconnection algorithm is proposed to create the multicast light-trees. Extensive simulations demonstrate the algorithm’s efficiency in terms of link stress and end-to-end delay.

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Authors and Affiliations

  1. IRISA, Campus de Beaulieu, Rennes, 35042, France

    Fen Zhou, Miklós Molnár & Bernard Cousin

  2. INSA de Rennes, 20, Avenue des Buttes de Coësmes, Rennes, 35042, France

    Fen Zhou & Miklós Molnár

  3. University of Rennes 1, Campus de Beaulieu, Rennes, 35042, France

    Bernard Cousin

Authors
  1. Fen Zhou
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  2. Miklós Molnár
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  3. Bernard Cousin
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Correspondence to Fen Zhou.

Additional information

A preliminary version of part of this work was presented in IEEE LCN 2008, Canada.

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Zhou, F., Molnár, M. & Cousin, B. Avoidance of multicast incapable branching nodes for multicast routing in WDM networks. Photon Netw Commun 18, 378–392 (2009). https://doi.org/10.1007/s11107-009-0200-3

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  • DOI: https://doi.org/10.1007/s11107-009-0200-3

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