On Monitoring Transparent Optical Networks
ICPPW '02 Proceedings of the 2002 International Conference on Parallel Processing Workshops
Single-link failure detection in all-optical networks using monitoring cycles and paths
IEEE/ACM Transactions on Networking (TON)
Optimal solutions for single fault localization in two dimensional lattice networks
INFOCOM'10 Proceedings of the 29th conference on Information communications
Adjacent link failure localization with monitoring trails in all-optical mesh networks
IEEE/ACM Transactions on Networking (TON)
SRLG failure localization in optical networks
IEEE/ACM Transactions on Networking (TON)
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In this paper, we introduce the concept of monitoring tours (m-tours) to uniquely localize all possible failures up to k links in all-optical networks. We establish paths and cycles that can traverse the same link at most twice (forward and backward) and call them m-tours. An m-tour is different from other existing schemes such as m-cycle and m-trail, which traverse a link at most once. Closed (open) m-tours start and terminate at the same (distinct) monitor location(s). Each tour is constructed such that any shared risk linked group (SRLG) failure results in the failure of a unique combination of closed and open m-tours. We prove that k-edge connectivity is a sufficient condition to localize all SRLG failures with up to k-link failures when only one monitoring station is employed. We introduce an integer linear program (ILP) and a greedy scheme to find the monitoring locations to uniquely localize any SRLG failures with up to k links. We provide a heuristic scheme to compute m-tours for a given network. We demonstrate the validity of the proposed monitoring method through simulations. We show that our approach using m-tours significantly reduces the number of required monitoring locations compared to previously developed techniques.