Impact of resource sharability on dual failure restorability in optical mesh networks

  • Authors:

  • Chadi Assi;Wei Huo;Abdallah Shami

  • Affiliations:

  • Concordia Institute for Information Systems Engineering, Concordia University, Montreal, Quebec, Canada;Concordia Institute for Information Systems Engineering, Concordia University, Montreal, Quebec, Canada;Department of Electrical and Computer Engineering, The University of Western Ontario, London, Ontario, Canada

  • Venue:
  • NETWORKING'05 Proceedings of the 4th IFIP-TC6 international conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communication Systems
  • Year:
  • 2005

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Abstract

Protection capacity re-provisioning mitigates the impact of double-link failures by provisioning new capacity for unprotected demands in a network designed to achieve 100% restorability under single-link failures. We study the performance of re-provisioning in networks under various resource sharing degrees. Intuitively, the lower is the sharability degree of resources the smaller is the number of unprotected connections resulting after the recovery from a failure. However, we show in this paper that limited resource sharability also implies limited flexibility for the network in finding capacity for unprotected demands after failures; which accordingly limits the capability of re-provisioning schemes in improving the network restorability. We further study the performance of different re-provisioning algorithms under distributed control and we show that contentions severely impact the restorability performance. Finally, we propose a simple mechanism to mitigate the effects of contentions.