Monitoring Trail Allocation for SRLG Failure Localization

Monitoring trail (m-trail) provides an efficient way to achieve fast and unambiguous failure localization (UFL) in all-optical networks. To remove electronic alarm dissemination, the extended m-trail concept allows trail status checking at each on-trail node. Each monitoring node can localize any failure using its locally available on-off status of the traversing m-trails. In this paper, we introduce a novel algorithm to unambiguously localize any SRLG failure locally at any MN. The proposed algorithm is characterized by a signalling-free alarm collection mechanism which can completely be realized in the optical domain. We will show that in the course of minimizing the number of m-trails, the consumed monitoring resources in terms of cover length can also be effectively reduced. Simulation is conducted to verify the proposed algorithm with respect to the number of m-trails, resource consumption, and running time.