Date of Award


Publication Type

Master Thesis

Degree Name



Computer Science

First Advisor

Bandyopadhyay, Subir

Second Advisor

Jaekel, Arunita




Survivability of files in data centers, when a disaster occurs, is becoming a major challenge in designing cloud-based services. When such a disaster occurs, a specific geographical area is affected and components of communication networks (e.g., nodes and fibers) within the affected area become faulty, leading to the failure of one or more on-going communication. To handle such a situation, a robust communication protocol is needed, so that provisions can be made to allocate an alternative fault-free path, when a disaster disrupts the path used for data communication before the disaster occurs. In this work we have presented a new approach to this problem, in the case of dynamic Route and Wavelength Assignment (RWA) in WDM networks. In our approach, a communication request can be handled only if it is possible to set up i) a primary lightpath that minimizes the number of disasters that may affect the lightpath and ii) (for each disaster that disrupts the primary lightpath), a backup lightpath that avoids the disaster. We have proposed, implemented and studied an efficient heuristic to solve this problem.