QoS-aware optimal resilient virtual networks

Network virtualization is seen as a possible solution to the ossification problem of the Internet by providing flexible and scalable virtual networks running over heterogeneous physical infrastructure. As for today's networks, it is very crucial to evaluate the virtual networks' adaptability to fulfill the demanding quality requirements of the diverse service offers. In addition, such an environment should promote protection strategies to face the unpredictable network failures, which cause significant service interruptions and consequently lead to definite revenue losses. Therefore, we introduce Quality of Service (QoS) modeling in virtual networks and provide three novel QoS-aware, resilient and cost-optimal virtual network design solutions. Through comprehensive simulations we show the necessity for such QoS models in virtual networks, where a no-QoS model fails to meet the requirements of 76% of the services for some service distributions. Finally, we compare the performance of the three proposed solutions having QoS-guarantees and resilience at different virtualization layers and show that there is a trade-off between virtual network cost and network utilization.