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arXiv 1503.06377cs.NI
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在NFV中实现虚拟网络功能

On Orchestrating Virtual Network Functions in NFV

Md. Faizul Bari, Shihabur Rahman Chowdhury, Reaz Ahmed, Raouf Boutaba

摘要:

防火墙、代理和WAN优化器等中间设备或网络设备已成为当今ISP和企业网不可或缺的一部分。中间盒功能通常部署在昂贵的专有硬件上,需要训练有素的人员进行部署和维护。中间盒对网络的资本和运营成本有很大的贡献。此外,组织通常要求其流量通过特定的中间盒序列,以符合安全和性能策略。这使得中间盒部署和维护任务更加复杂。网络功能虚拟化(NFV)是一种新兴且有前途的技术,其被设想来克服这些挑战。它建议将数据包处理从专用的硬件中间盒转移到在商品服务器上运行的软件上。在NFV术语中,软件中间盒被称为虚拟化网络功能(VNF)。确定优化网络运营成本和利用率而不违反服务水平协议的VNF的所需数量和放置是一个具有挑战性的问题。我们称之为VNF演示问题(VNF-OP),并提供了一个线性规划(ILP)制定与CPLEX中的实现。我们还提供了一个基于动态规划的启发式算法来解决更大的VNF-OP实例。在真实网络拓扑上的跟踪驱动模拟表明,该启发式算法可以提供1.3倍以内的最优解。我们的实验表明,基于VNF的方法可以将网络的运营成本降低4倍以上。

英文摘要:

Middleboxes or network appliances like firewalls, proxies and WAN optimizers have become an integral part of today's ISP and enterprise networks. Middlebox functionalities are usually deployed on expensive and proprietary hardware that require trained personnel for deployment and maintenance. Middleboxes contribute significantly to a network's capital and operational costs. In addition, organizations often require their traffic to pass through a specific sequence of middleboxes for compliance with security and performance policies. This makes the middlebox deployment and maintenance tasks even more complicated. Network Function Virtualization (NFV) is an emerging and promising technology that is envisioned to overcome these challenges. It proposes to move packet processing from dedicated hardware middleboxes to software running on commodity servers. In NFV terminology, software middleboxes are referred to as Virtualized Network Functions (VNFs). It is a challenging problem to determine the required number and placement of VNFs that optimizes network operational costs and utilization, without violating service level agreements. We call this the VNF Orchestration Problem (VNF-OP) and provide an Integer Linear Programming (ILP) formulation with implementation in CPLEX. We also provide a dynamic programming based heuristic to solve larger instances of VNF-OP. Trace driven simulations on real-world network topologies demonstrate that the heuristic can provide solutions that are within 1.3 times of the optimal solution. Our experiments suggest that a VNF based approach can provide more than 4x reduction in the operational cost of a network.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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