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Efficient Path-Segment Protection Utilizing Logical-ring Approach in WDM Mesh Network



I-S Hwang, I-Feng Huang, C-D Chien, David H. Su


This work proposes a distributed fault protection mechanism called the Dynamic-Shared Segment Protection (DSSP) algorithm for WDM (Wavelength Division Multiplexing) mesh networks. The study explores the shared protection scheme in the network with constraints of Shared Risk Link Group (SRLG) and Shared Bandwidth Assignment (SBA). The objects are to assure high probability of path protection and efficient use of network resources. The proposed approach exploits the segment protection mode, which accommodates the characteristics of both path-based and link-based protections, for providing finer service granularities, to satisfy the versatile requirements of critical applications in foreseeable future. The protection paths are pre-calculated from the logical-rings, which are dynamically created from mesh networks. Accordingly, the DSSP algorithm is able to select the suitable logical-rings to be protection paths quickly once a working path is assigned. To show that DSSP can improve performance efficiency, simulations are conducted using four networks (NSFNET, USANET, Mesh 6x6, Mesh 9x9) for a comparative study of the proposed DSSP versus ordinary shared protection schemes and SLSP (Short Leap Shared Protection). Simulation results reveal that the proposed DSSP method results in much lower blocking probability and has higher network utilization. Consequently, it is very useful for application to a real-time WDM network, which changes status dynamically.
Institute of Electronics


DSSP, fault protection, mesh topology, segment protection, shared protection, SRLG


Hwang, I. , Huang, I. , Chien, C. and Su, D. (2006), Efficient Path-Segment Protection Utilizing Logical-ring Approach in WDM Mesh Network, Institute of Electronics (Accessed April 18, 2024)
Created January 31, 2006, Updated October 12, 2021