Research on fault repair method of all-optical network based on SDN

All-optical network, as a new backbone network, is featured with high speed and large capacity transmission. It may be out of order due to various faults while providing high-performance transmission service, thus more effective fault repairing methods are required. A routing and wavelength assignment method based on SDN is designed and analyzed from the perspective of service function chaining in this paper. A multi-objective integer linear programming model based on impairment-aware and scheduling time is constructed by combining the unified control of control plane with the resource allocation mode of service function virtualization. Meanwhile, an improved Firefly Algorithm is adopted to solve the model for obtaining a better scheduling scheme, so as to the resources are allocated on-demand in a more flexible and efficient way, which effectively improved the self-recovery capability of the network. In the simulation experiments, Through the comparison between the method proposed and methods based on centralization and distribution, method proposed in the paper is superior to the compared ones in the indexes of survivability, blocking probability, link recovery time, and presents a better scheduling performance, makes the system has stronger ability of self-healing in the face of failure.