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One of the major issues for telecom operators today is how to rapidly identify the cause of failure and affected services within a multi-layer and multi-domain network to achieve high-quality service on an end-to-end basis. To assess this issue, this paper describes a real-time root cause analysis mechanism, which can pinpoint an accurate root cause and identify the influence on services. We investigated an interworking mechanism; based on a web service interface between an inventory and fault management systems and developed prototypes of them as part of an operation support system (OSS), which is capable of managing not only a core network and a metro ring network, but also a customer network. By introducing a hierarchical circuit model in the inventory management system and the proposed scanning algorithm over multiple layers and domains implemented in the fault management system, our developed root cause analysis was successfully verified using the testbed network environment; indicating relatively fast and scalable operation.