Abstract
Large-scale natural disasters can have a profound effect on the telecommunication services in the affected geographical area. Hence, it is important to develop routing approaches that may help in circumventing damaged regional areas of a network. This prompted the development of geographically diverse routing schemes and also of disaster-risk aware routing schemes. A minimum-cost geodiverse routing, where a minimum geographical distance value D is imposed between any intermediate element of one path and any element of the other path, is presented. Next, the problem of the calculation of a D-geodiverse routing solution which ensures a certain level of availability is tackled. An algorithm is described that either obtains a solution to that problem or the most available path pair satisfying the desired geographical distance value D—this can be useful for the specification of availability levels in Service Level Agreements. Finally, a case study is presented, in an optical network, to determine the cost increase in terminal equipment (transponders) of approaches to ensure a much larger separation of the paths (of the selected path pair), with respect to minimal length link-disjoint routing.
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Notes
- 1.
Note that the number of link crossings is \(x \ll |V|\) for backbone networks, with typical networks containing (almost) no link crossings. The maximum \(D=D_{sd}^{\text {Max}}\) value for which a pair of D-geodiverse paths exists can be calculated via a binary search using the algorithm of [28].
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Acknowledgements
This chapter is based on work from COST Action CA15127 (“Resilient communication services protecting end-user applications from disaster-based failures—RECODIS”) supported by COST (European Cooperation in Science and Technology). This work is funded by ERDF Funds through the Centre’s Regional Operational Program and by National Funds through the FCT—Fundação para a Ciência e a Tecnologia, I.P. under the project CENTRO-01-0145-FEDER-029312. This work was also partially supported by FCT under project UIDB/00308/2020. D. Santos was supported by the FCT post-doc grant SFRH/BPD/111503/2015 until November 2018. This work was partially supported by the High-Speed Networks Laboratory (HSNLab). Projects No. 123957, 129589, 124171, and 128062 have been implemented with the support provided from the National Research, Development and Innovation Fund of Hungary, financed under the FK_17, KH_18, K_17, and K_18 funding schemes, respectively. The work was also supported by the BME-Artificial Intelligence FIKP grant of EMMI (BME FIKP-MI/SC).
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Gomes, T. et al. (2020). Disaster-Resilient Routing Schemes for Regional Failures. In: Rak, J., Hutchison, D. (eds) Guide to Disaster-Resilient Communication Networks. Computer Communications and Networks. Springer, Cham. https://doi.org/10.1007/978-3-030-44685-7_19
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