DRAMA-DC: Disaster Recovery Algorithm with Mitigation Awareness in Data Center EONs

Elastic optical networks (EONs) have become a highly effective solution to address the exploding traffic demand driven by 5G/6G and cloud applications. Leveraging advanced optical technologies, EONs offer high allocation efficiency and flexibility. With the network function virtualization paradigm, critical network functionalities can be instantiated as software-based virtual network functions (VNFs) deployed within the net-work's data centers. An end-to-end service can then be composed as an ordered set of VNFs called as service function chain (SFC). Developing effective strategies for recovering SFCs after a disaster is a crucial challenge. In this work, we propose a new disaster recovery algorithm for data center EONs called DRAMA-DC. An auxiliary graph framework is developed to recover the affected SFCs and minimize the blocking ratio. Simulation results demonstrate the superior performance of DRAMA-DC in comparison to a baseline recovery algorithm, and the performance tradeoffs for recovery parameters.