Domain border node pair based network partition for sub-path protection in optical networks.

For real-time services, protection is preferable for its fast failure recovery in optical networks. Recently, sub-path protection has been proposed to provide scalable and efficient protection. However, it suffers from the long latency in connection provisioning and lack of protection for domain border node (DBN) failures. In this paper, DBN-Pair based Network Partition (DPNP) was presented to solve this problem. We develop the Integer Linear Program (ILP) formulation for network partition, as well as Sub-Path InCorporatE (SPICE) algorithm to provide protection for DBN failures in all routing scenarios. Our simulation results show that DPNP behaves much better than previous approaches in terms of connection blocking ratio, resource utilization efficiency and failure recovery time scalability.