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An algorithm for routing optimization in DiffServ-aware MPLS networks

Author

Listed:
  • Luigi Atzori

    (Dipartimento di Ingegneria Elettrica ed Elettronica Universita' di Cagliari)

  • Fabio D'Andreagiovanni

    (Dipartimento di Informatica e Sistemistica, Universita' di Roma "Sapienza")

  • Carlo Mannino

    (Dipartimento di Informatica e Sistemistica, Universita' di Roma "Sapienza")

  • Tatiana Onali

    (Dipartimento di Ingegneria Elettrica ed Elettronica Universita' di Cagliari)

Abstract
This paper addresses the constrained-based routing problem in DiffServaware MPLS networks. We consider a dynamic context in which new requests appear over time, asking for reconfigurations of the previous allocation. In the classical approach, a multi-phase heuristic procedure is adopted: the new requests are evaluated considering available bandwidth; if the bandwidth is not sufficient, preemption and rerouting of one or more connections are performed in sequence. As an alternative, we propose a single-phase approach that simultaneously takes into account both preemption and rerouting. In contrast with the standard approach, we always find an optimal solution when enough bandwidth is available. Otherwise, we apply a heuristic post-processing procedure in order to minimize unsatisfied commodities. The routing problem is modeled as a Multicommodity Flow Problem (MCFP) with side constraints, which is solved by a Column Generation approach. Namely, a sequence of restricted MCFPs is solved, by including new routing paths only if necessary. When new requests are routed, the use of existing paths is preferred in order to reduce preemption. Computational experience on real networks shows that the overall approach is able to (i) obtain a good exploitation of the network resources, (ii) achieve a remarkable acceptance rate and, (iii) hold down the impact of rerouting.

Suggested Citation

  • Luigi Atzori & Fabio D'Andreagiovanni & Carlo Mannino & Tatiana Onali, 2010. "An algorithm for routing optimization in DiffServ-aware MPLS networks," DIS Technical Reports 2010-04, Department of Computer, Control and Management Engineering, Universita' degli Studi di Roma "La Sapienza".
    • Handle: RePEc:aeg:wpaper:2010-4
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    File URL: http://www.dis.uniroma1.it/~bibdis/RePEc/aeg/wpaper/2010-04.pdf
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    References listed on IDEAS

    as
    1. Kaj Holmberg & Di Yuan, 2003. "A Multicommodity Network-Flow Problem with Side Constraints on Paths Solved by Column Generation," INFORMS Journal on Computing, INFORMS, vol. 15(1), pages 42-57, February.
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