Characterizing and reducing route oscillations in the Internet

  • Authors:
  • Vivian Elliott;Kenneth J Christensen

  • Affiliations:
  • Department of Computer Science and Engineering, University of South Florida, 4202 East Fowler Avenue, ENB 118, Tampa, FL 33620, USA;Department of Computer Science and Engineering, University of South Florida, 4202 East Fowler Avenue, ENB 118, Tampa, FL 33620, USA

  • Venue:
  • Computer Communications
  • Year:
  • 2003

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Abstract

Oscillation of routes in the Internet causes unnecessary overhead. Border Gateway Protocol (BGP) transactions collected from the MAE-East exchange point for 2000 (January-December) show that approximately 16% of routing overhead traffic exhibits oscillating Autonomous System paths. About 66% of these paths used extra, unnecessary hops to route data traffic resulting in up to 10% extra-hop count. Common characteristics are shown to exist in oscillating routes. Our findings demonstrate that long-theorized route oscillations really do occur in the Internet. Faulty implementations and/or poor policy choices are likely causes, where the currently specified method of BGP implicit withdrawals causes propagation through the Internet. To reduce oscillations, we propose a new method of forcing explicit withdrawals in BGP. Simulation experiments with forcing explicit withdrawals show an overall reduction of the transaction traffic, as well as a reduction in path length.