Squeezed Protection in Elastic Optical Networks Subject to Multiple Link Failures

Elastic optical network (EON) is fast becoming a key solution for designing with better usage of spectrum resources or other objectives interest to tenant and/or operators. A primary concern EONs protect the against failures its elements, because this kind event can provoke loss substantial amount traffic. In paper, we propose new mixed integer linear programming (MILP) formulation protecting traffic multiple link failures. The idea use bandwidth squeezing together grooming capability provide few extra protection and guarantee minimum each source-destination node pair under failure events. proposed solves virtual topology design problem jointly grooming, routing, modulation allocation (RMSA) tasks. Due non-deterministic polynomial time (NP-hard) nature MILP formulation, heuristic strategy (referred as two-step MILP) large networks also proposed. solutions performance analyzed through case studies in small network. addition, three assessed cases scenarios where connections are different service-level agreement (SLA). view MILP, it possible identify configurations that ensure kinds single