Dynamic traffic grooming and load balancing for GMPLS-Centric all optical networks

Abstract

Fast and resource optimized lightpath restoration strategies are urgent requirements for the near future Optical Transport Networks (OTN) with a Generalized Multi-Protocol Label Switching (GMPLS) control plane. In this paper, we propose a lightpath selection scheme with Shared Risk Link Group (SRLG) constraints that guarantees fast and load balanced recovery of lightpaths in GMPLS-centric all optical networks. To this, we propose a lightpath allocation and recovery strategy called "Enhanced Reverse Shared Risk Link Group (E-RSRLG)" and demonstrate how this concept can be applied to minimize recovery blocking probability and network convergence time. A 32-node network topology has been set up in OPNET™ to analyze the effects of E-RSRLG handling in terms of two performance factors: the number of recovery contention and the number of extra hops. © Springer-Verlag 2004.