PhD Thesis Final Defense to be held on July 14, 2017, at 11:00

The examination is open to anyone who wishes to attend.

Thesis Title: Management of Future Internet Networks - Policy-Based Management in Federated Networking Infrastructures


In this thesis we analyze the issues related to the federation of Virtualized Infrastructures (VIs) towards the Future Internet. We present the theory and current research on Information Models, Virtualized Infrastructures and Policy Based network management. We present the proposed Information Model for the federation of VIs, with emphasis on the Policy Ontology that includes the definition and relations of the policies used for the management of the heterogeneous infrastructures and for the federation.
We present the Policy-based Federation (PBF) architecture for interworked Future Internet Virtualized Infrastructures (VIs). Each VI is an individually managed autonomous domain. Users may request slices of virtual resources across the federation, managed and controlled via inter-domain policies that abide by agreed upon federated SLAs. The key component of our PBF architecture is a Policy Service, which provides support for intra-domain policies (Obligation, Authorization, Role-Based Access Control) and for inter-domain Delegation policies. Delegation policies reserve resources in remote domains, update the number of resources exchanged, set alien domain obligations for cross-domain resource provisioning and define the exchange of internal domain information through the execution of remote semantic queries. Key to the architecture is the PBF Policy Ontology that specifies common federation concepts within the context of a user slice and the PBF services that trigger management actions. A prototype of the proposed architecture was developed using the Ponder2 policy specification language and deployed in the NOVI European Future Internet federated testbed.
As a next step of this research work, we studied the usage of policies for the management of resources in Software Defined Networks (SDN). For that purpose the Information Model was extended in order to provide descriptions for the OpenFlow resources, the Virtual Network Functions (VNFs) and Network Function Virtualization (NFV), while the policies were applied in three levels for the management of the network resources, of the lifecycle of the VNFs and for the NFV orchestration.
An extended version of the proposed PBF architecture was utilized for the federation of cloud computing domains. Specific Delegation policies and a utility function were presented for the reservation of resources among federation. Simulation results depict the effect of the policies and the advantages of using the policy based federation.

PhD student: Yiannos Kryftis

Supervisor: V. Maglaris (Professor)