Cost and Availability-Aware VNF Selection and Placement for Network Services in NFV
Yanal Alahmad, Anjali Agarwal, Tariq Daradkeh · 2020
Network Function Virtualization (NFV) is a growing computing paradigm for rapid and economical provisioning of networking services (NSs). In NFV, NS is provided through a set of Virtual Network Functions (VNFs) that are hosted on the underlying infrastructure offered by the service provider. Quality of the NS such as availability, as well as the overall cost of providing the NS in NFV domain are raised as concern issues especially their objectives go against each other. This paper tackles two main problems that are directly related to the cost and availability of the NS, VNFs configuration types selection problem and VNF placement problem. Therefore, we propose two Mixed Integer Linear Programming (MILP) optimization models to address both problems and find solutions. We build a proof of concept to evaluate our proposed solutions and compare them with existing solutions from the literature. The results show that our proposed solutions can reduce the overall cost of requested NSs without violating their availability requirements.