Low complexity link state multipath routing

  • Authors:
  • Pascal Mérindol;Jean-Jacques Pansiot;Stéphane Cateloin

  • Affiliations:
  • Université Catholique de Louvain, Louvain la Neuve, Belgium;LSIIT-CNRS, Université de Strasbourg, Illkirch, France;LSIIT-CNRS, Université de Strasbourg, Illkirch, France

  • Venue:
  • INFOCOM'09 Proceedings of the 28th IEEE international conference on Computer Communications Workshops
  • Year:
  • 2009

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Abstract

Link state routing protocols such as OSPF or IS-IS currently use only best paths to forward IP packets throughout a domain. The optimality of subpaths ensures consistency of hop by hop forwarding although paths, calculated using Dijkstra's algorithm, are recursively composed. According to the link metric, the diversity of existing paths can be underestimated using only best paths. Hence, it reduces potential benefits of multipath applications such as load balancing and fast rerouting. In this paper, we propose a low time complexity multipath computation algorithm able to calculate at least two paths with a differentfirst hop between all pairs of nodes in the network if such next hops exist. Using real and generated to pologies, we evaluate and compare the complexity of our proposition with severa techniques. Simulation results suggest that the path diversity achieved with our proposition is approximatively the same that the one obtained using consecutive Dijsktra computations, but with a lower time complexity.