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Pro-Red: Prognostic redesign of survivable virtual networks for cloud data centers

This paper deals with the problem of proactive survivability of Virtual Networks (VNs) residing in a cloud data center. In all of the previous work, the protection schemes consists of augmenting the VNs with a pre-determined number of backup nodes. Further, to reduce the amount of provisioned resources, various backup resource sharing schemes are introduced, which are mainly employed when mapping the augmented VN onto the substrate network. This renders the existing redesign techniques agnostic to the backup resource sharing in the substrate network, and highly dependent on the efficiency of the adopted mapping approach. In this paper, we swerve from this dogmatic approach, and introduce Pro-Red, a novel prognostic redesign technique that is capable of foretelling (encouraging) the backup resource sharing in the substrate network, prior to the embedding phase. Our numerical results prove that this redesign technique achieves lower-cost mapping solutions and greatly enhances the attainable backup sharing, boosting the overall network's admissibility.