Estudo Geralhttps://estudogeral.sib.uc.ptThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Thu, 27 Jan 2022 05:40:06 GMT2022-01-27T05:40:06Z5011Two Heuristics for Calculating a Shared Risk Link Group Disjoint Set of Paths of Min-Sum Costhttp://hdl.handle.net/10316/48329Title: Two Heuristics for Calculating a Shared Risk Link Group Disjoint Set of Paths of Min-Sum Cost
Authors: Gomes, Teresa; Soares, Miguel; Craveirinha, José; Melo, Paulo; Jorge, Luísa; Mirones, Vitor; Brízido, André
Abstract: A Shared Risk Link Group (SRLG) is a set of links which share a common risk of failure. Routing protocols in Generalized MultiProtocol Label Switching (GMPLS), using distributed SRLG information, can calculate paths avoiding certain SRLGs. For single SRLG failure an end-to-end SRLG-disjoint path pair can be calculated, but to ensure connection in the event of multiple SRLG failures a set with more than two end-to-end SRLG-disjoint paths should be used. Two heuristic, the Conflicting SRLG-Exclusion Min Sum (CoSE-MS) and the Iterative Modified Suurballes's Heuristic (IMSH), for calculating node and SRLG-disjoint path pairs, which use the Modified Suurballes's Heuristic (MSH), are reviewed and new versions (CoSE-MScd and IMSHd) are proposed, which may improve the number of obtained optimal solutions. Moreover two new heuristics are proposed: kCoSE-MScd and kIMSHd, to calculate a set of k node and SRLG-disjoint paths, seeking to minimize its total cost. To the best of our knowledge these heuristics are a first proposal for seeking a set of k (k>2) node and SRLG-disjoint paths of minimal additive cost. The performance of the proposed heuristics is evaluated using a real network structure, where SRLGs were randomly defined. The number of solutions found, the percentage of optimal solutions and the relative error of the sub-optimal solutions are presented. Also the CPU time for solving the problem in a Path Computation Element (PCE) is reported.
Description: Two Heuristics for Calculating a Shared Risk Link Group Disjoint Set of Paths of Min-Sum Cost
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10316/483292015-01-01T00:00:00Z