Proactive Connection Recovery Strategies for Survivable Elastic Optical Networks

Abstract

Optical fiber provides very high bandwidth, offers a high-speed network, and carries vast information. By using dense wavelength division multiplexing (DWDM) technology a large amount of data can be transmitted simultaneously. The optical fiber network is the backbone for internet traffic worldwide. In the last few years, internet traffic increases continuously due to the more use of live streaming and social sites. To accommodate such high traffic demand the more bandwidth is required. The elastic optical network (EON) is an emerging solution to meet the future higher bandwidth requirement. The EON can provide a higher data rate. The link and node failure in the optical network causes huge revenue and data loss. The survivability of high-speed networks is very essential. For the survivability of EON, a backup path is reserved in advance or searched dynamically after the failure occurred in the network. Both these recovery strategies required a large backup capacity. In this thesis, we proposed four different types of survivability schemes for a single and dual-link failure in the optical network. Initially, we proposed a halfway signaling exchange shared path protection (HSE-SPP), a pre-assigned intermediate node on the backup route is chosen for signaling exchange. When the connection fails, source and destination nodes simultaneously generate backup connection setup messages to the pre-assigned intermediate node on the reserved backup route. Consequently, connection recovery time by applying HSE-SPP becomes very low. newlineAs the size of the network increased the possibility of the double-link failure and node failure also increases. For dual-link failure, we implemented a parallel cross-connection backup recovery scheme. Our proposed survivable scheme has lower bandwidth blocking probability (BBP), minimum bandwidth provisioning ratio (BPR), and fast connection recovery time, than existing dedicated path protection (DPP), and shared path protection (SPP). Simulation is performed for ARPANET, COST239, and NSFNET to