SRLG Failure Localization in All-Optical Networks Using Monitoring Cycles and Paths

The authors introduce the concepts of Monitoring Paths (MPs) and Monitoring Cycles (MCs) for unique localization of Shared Risk Linked Group (SRLG) failures in all-optical networks. An SRLG failure is a failure of multiple links due to a failure of a common resource. MCs (MPs) start and end at same (distinct) monitoring location(s). They are constructed such that any SRLG failure results in the failure of a unique combination of paths and cycles. They derive necessary and sufficient conditions on the set of MCs and MPs needed for localizing an SRLG failure in an arbitrary graph.