F. Touvet

University of Strathclyde, Glasgow, Scotland, United Kingdom

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Publications (3)0 Total impact

  • F. Touvet, D. Harle
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    ABSTRACT: A comparison between three schemes for the protection of lightpaths in wavelength-routed networks under the control of the GMPLS plane is presented. The protocols used to establish ER-LSP in GMPLS can be used in the optical domain to provision virtual lightpaths over pre-computed paths and for protection mechanisms deployment. The extensions for traffic engineering of the OSPF and RSVP protocols enable the planning of shared protection mechanisms. The first scheme considered is a simple dedicated protection scheme. The last two schemes are based upon shared protection wavelengths and can be supported by current protocols. The schemes have been evaluated using models that focus upon the relative merits of the protection schemes in terms of admission control for the lightpath requests. Path selection is of secondary interest. Results show that, for WDM networks with wavelength conversion, the shared protection mechanism using partial fibre information performs well and can be an alternative to the use of a complex shared backup scheme; it demands a minimal number of reserved protection wavelengths and offers relatively low rejection probability.
    Communications, 2003. ICC '03. IEEE International Conference on; 06/2003
  • F. Touvet, D. Harle
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    ABSTRACT: Current networks integrate multiple transport technologies to exploit their relative advantages and different functionalities, and these are multilayer networks combining IP/ATM/SDH/WDM technologies. To provide end to end survivability, different restoration mechanisms at different layers must be combined efficiently in order to achieve fast restoration, maximum availability and minimum restoration cost. This paper describes the key issues associated with the implementation of restoration in a multilayer network. Moreover, the “best” strategies proposed so far are presented and the current state of standardisation is discussed. Finally, current unresolved issues and open problems are highlighted.
    Networking - ICN 2001, First International Conference, Colmar, France, July 9-13, 2001 Proceedings, Part 1; 01/2001
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    Florence Touvet, David Harle
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    ABSTRACT: The paper proposes an approach for calculating the protection pool size on each link in a mesh WDM- routed network. The protection pool evaluation is part of a shared protection scheme applied to a failure dependent scenario and based on aggregated information dissemination. Two models based on a probabilistic approach are proposed to provide a scheme that is scalable as the number of optical cross-connects (OXC), fibres and wavelength multiplexing in a core network increases. Precisely, two models based on a binomial and a beta-binomial distribution are presented. The evaluation of the models by simulation shows that both models are attractive propositions to oer protected