دانلود رایگان ترجمه مقاله چارچوب مدیریت مجازی شبکه مبتنی بر گراف انتزاعی برای SDN – آی تریپل ای 2016

گراف انتزاعی بر اساس چارچوب مدیریت شبکه مجازی برای SDN

Graph Abstraction Based Virtual Network Management Framework For SDN

Abstract 

Currently, Software Defined Networking (SDN) paradigm has attracted a significant interest from industry and academia as a future network architecture. The programmable control plane enables flexible and rapid modifications of network behavior. With OpenFlow, one of the promising SDN protocols, we can provide several advantages to develop advanced network virtualization technologies. In this paper, we propose a graph abstraction based virtual network management framework that covers from tenant requirement specification to virtual network embedding on physical resources. The fundamental idea is to automatically create and manage virtual networks on the top of SDN technologies from high level tenant requirements. We expect that the proposed framework can overcome the limitation of overlay based network virtualization technologies, and leverage the deployment of SDN technologies.

I. INTRODUCTION

In recent years, Software-Defined Networking (SDN) has received a lot of attention by networking researchers, vendors, standard organizations, data center operators and telcos around the world. SDN has been envisioned to provide various benefits to operators such as programmability, flexibility, elasticity, and reduction of CAPEX/OPEX. SDN is defined as “the physical separation of the network control plane from the forwarding plane, and where a control plane controls several devices” by Open Networking Foundation (ONF) [1]. OpenFlow [2], which is one of the most promising implementations of SDN, enables the network controller to determine the path of network packets through the OpenFlow enabled switches. With OpenFlow, network operators can manage network traffic in a flow level with a centralized global view of the network at the controller. SDN brings various advantages such as programmability, agility, flexibility, reduced CAPEX/OPEX. Network Virtualization (NV) is a method of providing an illusion of a dedicated network on top of the hardware resources, and it allows the sharing of the same hardware resources among multiple users without any interference among virtual networks. By creating logical Virtual Networks (VNs) that run on top of a physical network, it allows to separate network functionality from physical equipment. NV technology can bring various advantages such as multi-tenancy, flexibility, scalability, agility, and reduced CAPEX/OPEX. Unfortunately, most of commercial NV solutions are focused on data-center networks based on overlay approaches such as VMware NSX [3] and Microsoft Hyper-V [4]. These overlay based NV approaches construct multiple VNs as overlay network using tunnelling method. This approach is simple to deploy, and requires no network configuration changes. However, they suffer from tunneling overhead and requiring special hardware (or software) such as virtual switches or derivers. SDN and OpenFlow can provide several advantages to develop advanced NV technologies because it provides the abstraction on various switch hardware. With OpenFlow, we can assign a part of physical resources for each VN via segmented flow tables, slices. We call this approches as slice based NV approach. Currently, several solutions based on network slice are available such as FlowVisor [5], OpenVirteX [6], and FlowN [7]. The slice based approaches accompany no tunneling overhead, and provide strong QoS and SLA control. The main shortage is that they require OpenFlow based network infrastructure. Now, these solutions are in incubation or prototyping stage. Moreover, they are suffer from manual VN configuration, lack of VN embedding method, and no automated VN management process. In this paper, we propose a graph based virtual network management framework based on SDN. The fundamental idea is to automatically manage VNs from high-level tenant requirements. More specifically, the proposed approach will address following problems. – How to create VNs on top of SDN networks? – How to specify VN requirements in high level? – How to compose VN from requirements automatically? – How to embed the composed VNs optimally? – How to dynamically re-embed VNs to address requirement changes or network failure?