Achieving sub-second IGP convergence in large IP networks

  • Authors:
  • Pierre Francois;Clarence Filsfils;John Evans;Olivier Bonaventure

  • Affiliations:
  • Université catholique de Louvain (UCL), Belgium;Cisco Systems;Cisco Systems;Université catholique de Louvain (UCL), Belgium

  • Venue:
  • ACM SIGCOMM Computer Communication Review
  • Year:
  • 2005

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Abstract

We describe and analyse in details the various factors that influence the convergence time of intradomain link state routing protocols. This convergence time reflects the time required by a network to react to the failure of a link or a router. To characterise the convergence process, we first use detailed measurements to determine the time required to perform the various operations of a link state protocol on currently deployed routers. We then build a simulation model based on those measurements and use it to study the convergence time in large networks. Our measurements and simulations indicate that sub-second link-state IGP convergence can be easily met on an ISP network without any compromise on stability.