توضیحات
ABSTRACT
Softwarization is the current trend of networking based on the success of technologies like Software Defined Networking (SDN) and Network Virtualization. Network as a Service (NaaS) is a new paradigm based on virtualization that enables customers toinstantiate their virtual networks over a physical substrate network, mapping necessary resources by a Virtual Network Embedding (VNE) algorithm. Each VNE algorithm defines a resource allocation strategy of the NaaS provider, and determines its expenditures and revenues. Even though the problem of VNE has been widely investigated in recent years, virtualization in SDN introduces new challenges due to the new role of the controller and additional architectural constraints. In this paper, we investigate the VNE problem whereboth virtual and substrate networks are software defined. We propose a mathematical programming formulation that considers both the objectives of the NaaS provider (profit maximization) and the customers (switch-controller delay minimization). Proposing new design metrics (i.e., k-hop delay, correlation, and distance), we develop a heuristic algorithm,and prove its effectiveness through extensive simulations in the well-known VNE evaluation tool, ALEVIN, and comparisons with other algorithms and mathematical bounds.
INTRODUCTION
In recent years, two technologies had major impact on computer networks, namely Software Define Networking (SDN) and Network Virtualization. SDN has introduced a new networking paradigm where the control plane is fully programmable and located in a logically centralized entity called the controller, while switches are simple packet forwarding devices (the data plane) where forwarding rules are programmed via an open interface e.g., ForCES , SoftRouter, and OpenFlow in their flow tables. In software-defined networks, the switch-controller delay is a new important issue due to its impact on the network performance . Network Virtualization or “Network as a Service” (NaaS) allows to flexibly organize network functions and to deploy multiple virtual networks on a shared physical substrate network, where functions and resources are logically separated. Allocation of resources to virtual network (VN) requests, the key issue in NaaS, is commonly referred to as the Virtual Network Embedding (VNE) problem. In this problem, a set of VNs with given resource and topology requests should be mapped on a resource-limited substrate network optimizing specific efficiency objectives.
Year: ۲۰۱۸
Publisher : ELSEVIER
By : Mohammad Khaksar Haghania, Bahador Bakhshi, Antonio Capone
File Information: English Language/ 21 Page / size: 1.10 MB
سال : ۱۳۹۶
ناشر : ELSEVIER
کاری از : محمد خاکسار حقانی، بهادر بختی، آنتونيو کاپون
اطلاعات فایل : زبان انگلیسی / 21 صفحه / حجم : MB 1.10
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