Abstract
NFV-based network implements a variety of network functions with software on general-purpose servers and this allows the network operator to select any capacity and location of network functions without any physical constraints. It is essential for economical NFV-based network design to determine the place where each network function should be located in the network and what its capacity should be. The authors proposed an algorithm of virtual routing function allocation in the NFV-based network for minimizing the network cost and provided effective allocation guidelines for virtual routing functions. This paper proposes the deployment algorithm of virtual firewall function in addition to virtual routing function for minimizing the network cost. Our evaluation results have revealed the following: (1) Installing a packet filtering function, which is a part of the firewall function, in the sending-side area additionally can reduce wasteful transit bandwidth and routing processing and thereby reduce the network cost. (2) The greater the number of packets filtered by packet filtering function in the sending-side area, the more the reduction of network cost is increased. (3) The greater the bandwidth cost relative to the routing function cost, the greater the effect of statistical multiplexing on reducing the network cost. (4) The proposed algorithm would be approaching about 95% of the deployment with the optimal solution.
Highlights
Virtualization is a technique to make a single physical entity appear multiple logical entities or, to make multiple physical entities look like a single logical entity
(2) The greater the number of packets filtered by packet filtering function in the sending-side area, the more the reduction of network cost is increased
Network functions virtualization (NFV) [1]-[4] represents an application of virtualization technology to network functions
Summary
Virtualization is a technique to make a single physical entity appear multiple logical entities or, to make multiple physical entities look like a single logical entity. It enables a piece of software that can conventionally operate only on a specific piece of hardware to operate on a general-purpose server, making it possible to build a network quickly and to operate it in a flexible manner It has already been commercially introduced in public mobile networks [5]. In an NFV-based network, a variety of network functions is implemented in software on generalpurpose servers This makes it possible to select the capacity and location of each function without any physical constraints. As a deployment method for NFV-based network, there is a method of efficiently allocating already installed physical resources to the virtual network function as a short-term perspective. This has been studied as VNE (Virtual Network Assignment) problems [6]. The research from a medium-term to long-term perspective is required
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