Some Synchronization Issues in OSPF Routing

Anne Bouillard 1, 2, 3 Claude Jard 4 Aurore Junier 5
2 DYOGENE - Dynamics of Geometric Networks
CNRS - Centre National de la Recherche Scientifique : UMR8548, Inria Paris-Rocquencourt, DI-ENS - Département d'informatique de l'École normale supérieure
5 SUMO - SUpervision of large MOdular and distributed systems
Inria Rennes – Bretagne Atlantique , IRISA-D4 - LANGAGE ET GÉNIE LOGICIEL
Abstract : A routing protocol such as OSPF has a cyclic behavior to regularly update its view of the network topology. Its behavior is divided into periods. Each period produces a flood of network information messages. We observe a regular activity in terms of messages exchanges and fi lling of receive bu ffers in routers. This article examines the consequences of possible overlap of activity between periods, leading to a buff er overflow. OSPF allows "out of sync" flows by considering an initial delay (phase). We study the optimum calculation of these off sets to reduce the load, while maintaining a short period to ensure a protocol reactive to topology changes. Such studies are conducted using a simulated Petri net model. A heuristic for determining initial delays is proposed. A core network in Germany serves as illustration.
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Anne Bouillard, Claude Jard, Aurore Junier. Some Synchronization Issues in OSPF Routing. DCNET13: the 4th International Conference on Data Communication Networking,, Jul 2013, Reykjavik, Iceland. pp.5-14. ⟨hal-00840350⟩

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