Abstract
In this paper, in order to improve network security, we propose an optimal placement of security virtual network function (security VNF) for service function chains based on the security level. In this method, an optimization problem is formulated for constructing service function chains based on the security level, and its near-optimal solution is derived with genetic algorithm. From the derived solution, security VNFs are placed to satisfy the security level of each service function chaining and many service function chains can be constructed to obtain higher revenue and less cost while considering the security level. We evaluate the performance of our proposed method with simulation, and the performance of this method is compared with the performance of other methods where security VNFs are selected based on those CPU resources. Numerical examples show that the proposed method is effective to construct service function chains by using security VNFs in order to improve network security.
Highlights
Nowadays, by using virtualization technology, new network architectures, protocols, and applications can be utilized more feasibly in a substrate network [1]–[4]
We propose an optimal construction of service function chains based on the security level to improve network security
We evaluate the performance of our method in two cases; one is a case where security virtual network function (VNF) can be shared among multiple service function chains (Shared method) and the other is a case where security
Summary
By using virtualization technology, new network architectures, protocols, and applications can be utilized more feasibly in a substrate network [1]–[4]. We propose an optimal construction of service function chains based on the security level to improve network security. In this method, for each service function chain, security VNFs are selected to satisfy the security level of each service function chain, and the selected security VNFs are placed appropriately in substrate nodes. By using our proposed method, many service function chains can be constructed in the substrate network by considering security level. Our proposed method considers the security level of each security VNF according to [26], where virtual networks are constructed based on [5]. This paper introduces the collaboration of security level of VNF and service function chaining to improve network security.
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