Object-Oriented Design and Implementation of Fault Management Function for MPLS network

In this paper, we propose a fault management with fast rerouting restoration scheme in MPLS network. The proposed scheme finds out the root cause of the occurred fault, and provides differentiated service with guaranteed QoS (Quality of Service) according to the differentiated backup path options. It can provide various backup path options, such as 1:1, 1:N or M:N fast-reroute by NMS, and operation modes, such as standby mode, path-option mode, based on the link/ node protection mechanism in Cisco router. The proposed fault management scheme has been designed to be easily implemented in MPLS network composed of multiple MPLS LSRs (Label Switched Router) of various vendors. We also propose an efficient implementation scheme that can handle failure rapidly, considering the link preemption priority among LSPs to improve the efficiency of network resources, which is one of the most important performance factors of fault restoration. The proposed scheme can guarantee the required bandwidth of backup LSP.