In optical networks, fault detection is an important aspect of network management system, also a prerequisite to the protection/restoration process triggered when abnormal conditions or break-downs of links or nodes happen in thenetworks. The ever-growing development of optical networks, such as the division of domains and the diversity of thetechniques, protocols and administration policies adopted by different network operators, challenges the traditional faultlocalization methods applied in single domain networks. This paper investigates the fault localization problems forsingle-domains, and then extends it into multi-domain optical networks. A Multi-Domain Layered Fault Localization(MD-LFL) Model is proposed to address this problem. And then its application scenario is presented to show itseffectiveness by sub-dividing the computational complexity among domains and introducing cooperative diagnosisbetween domains.
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