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In optical WDM networks, since each lightpath can carry a huge mount of traffic, failures may seriously damage the end-user applications. Hence fault-tolerance becomes an important issue on these networks. The light path which carries traffic during normal operation is called as primary path. The traffic is rerouted on a backup path in case of a failure. In this paper the authors propose to design a reliable and fault-tolerant routing algorithm for establishing primary and backup paths. In order to establish the primary path, this algorithm uses load balancing in which link cost metrics are estimated based on the current load of the links.
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