A novel segment protection with segment route scheme in multicasting survivable networks

The protection scheme is a key issue in survivable wavelength division multiplexing (WDM) optical networks. In this paper, we investigate the problem of multicast requests in survivable networks against any single-link failure and propose a novel scheme called segment protection with segment route (SPSR). Through dynamically adjusting link-cost according to the current network state, SPSR establishes a primary light-tree and corresponding link-disjoint backup segments for each multicast connection request. An analytical model was proposed for blocking probability analysis and adaptive routing algorithm to solve the potential shortcomings in the real network. We make the use of the idea of segmented routes according to the branch nodes. We then combine the each segment to get the whole blocking probability. Simulation results show that with the consideration of load balancing SPSR exhibits better blocking probability and resource utilization performance relative to other schemes.