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p-Cycle Design in Survivable WDM Networks with Shared Risk Link Groups (SRLGs)

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Abstract

p-Cycle survivable network design under the single link failure assumption has been studied extensively. Shared risk link group (SRLG) is a concept that better reflects the nature of network failures. An SRLG is a set of links that may fail simultaneously because of a common risk they share. The capability of dealing with SRLG failures is essential to network survivability. In this paper, we extend the p-cycle survivable network design from the single link failure model to the single SRLG failure model. An integer linear programming (ILP) formulation that minimizes spare capacity requirement is provided. To avoid enumerating all cycles of a network, we also provide a polynomial-time algorithm to generate a basic candidate p-cycle set that guarantees 100% restorability in case of any single SRLG failure given enough spare capacities. Moreover, we present the SRLG failure detection problem that prevents fast restoration upon an SRLG failure. To solve this problem, we introduce the concept of SRLG-independent restorability, which enables the restoration of each link in a failed SRLG to start immediately without knowing which SRLG has failed. We present an approach to optimal p-cycle design with SRLG-independent restorability and show that it is NP-hard to generate a candidate p-cycle set such that each link can be SRLG-independently restored by at least one cycle in the set.

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Authors and Affiliations

  1. Department of Computer Science, Iowa State University, Ames, IA, 50011

    Chang Liu & Lu Ruan

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  1. Chang Liu
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  2. Lu Ruan
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Correspondence to Lu Ruan.

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Liu, C., Ruan, L. p-Cycle Design in Survivable WDM Networks with Shared Risk Link Groups (SRLGs). Photon Netw Commun 11, 301–311 (2006). https://doi.org/10.1007/s11107-005-7357-1

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  • DOI: https://doi.org/10.1007/s11107-005-7357-1

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