Software-Defined Networking 2.0

软件定义网络2.0

• 批准号: RGPIN-2018-06280
• 负责人: Ganjali, Yashar
• 金额: $ 2.99万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=688366
• 关键词: Software; Defined; Networking; 2.0

The ever-increasing demand for networks requires significant changes in the current Internet. Software-Defined Networking (SDN) was proposed to address these challenges. The basic idea behind SDN is to separate the control plane from the switches (data path). This separation can essentially: (i) make network switches extremely simple, fast, and inexpensive; (ii) make it easy to make changes to the network controller since the change is done in software; (iii) simplify network management and optimization by creating a global view of network resources; and (iv) lower the barrier to entry for individuals and small companies to build and change network components to be used in large-scale networks, which is another way to reduce cost.******A major accelerator for development and deployment of software-defined networks has been the OpenFlow protocol. This is the de facto standard for interactions between network switches and SDN controllers. Unfortunately, OpenFlow intrinsically limits the information channel between switches and the control plane, which imposes significant restrictions on the types of controller applications we can support. For example, any applications (e.g. smart firewall, application-aware load balancer, etc.) that require access to payload of packets beyond the initial packet of a flow cannot be implemented with OpenFlow. ******Can we move from a rigid flow-based protocol like OpenFlow, to a design where control applications can define and dynamically change the granularity and the pattern of packets they receive from switching elements? ******There are two new advances in SDN world that might make this possible: 1) Recent developments in programmability of network devices (e.g. P4) allow execution of a complex logic on every packet in data plane. This is a very powerful feature that gives extreme control on which packets to send to the controller; and 2) with the introduction of the new generation of distributed controllers (e.g. ONOS, and Beehive), scalability is not considered to be a major roadblock for deployment of SDN solutions. ******These advances open the door to new protocols that allow control applications to tune the granularity of the data they require from switches, which we call "Software-Defined Networking 2.0". SDN 2.0 will allow a wide range of new applications that cannot be implemented in today's networks. A smart firewall application, for example, can start with a low overhead surveillance of the entire network, and dynamically increase the number of packets sent to the controller when it identifies abnormal activities in certain parts of the network. SDN 2.0 can be used for debugging and troubleshooting network control applications, a feature missing in today's networks. To that end, we can increase the fraction of traffic sent to the controller for fine-grained analysis and troubleshooting, and reduce the load under normal operation of the network.**

不断增长的网络需求要求对当前的互联网进行重大变革。软件定义网络（SDN）就是为了应对这些挑战而提出的。SDN背后的基本思想是将控制平面与交换机（数据路径）分离。这种分离基本上可以：（i）使网络交换机极其简单、快速和便宜;（ii）使对网络控制器的改变变得容易，因为改变是在软件中完成的;（iii）通过创建网络资源的全局视图来简化网络管理和优化;以及（iv）降低个人和小公司构建和改变要在大规模网络中使用的网络组件的进入门槛，这是另一种降低成本的方法。软件定义网络的开发和部署的主要加速器是OpenFlow协议。这是网络交换机和SDN控制器之间交互的事实标准。不幸的是，OpenFlow本质上限制了交换机和控制平面之间的信息通道，这对我们可以支持的控制器应用类型施加了重大限制。例如，任何应用程序（例如，智能防火墙，应用感知负载均衡器等）需要访问流的初始分组之外的分组的有效载荷的方法不能用OpenFlow来实现。** 我们是否可以从OpenFlow这样严格的基于流的协议转移到控制应用程序可以定义并动态更改从交换元件接收的数据包的粒度和模式的设计？** SDN领域有两个新的进展可能使这成为可能：1）网络设备（例如P4）可编程性的最新发展允许在数据平面中的每个数据包上执行复杂逻辑。这是一个非常强大的功能，可以对向控制器发送哪些数据包进行极端控制; 2）随着新一代分布式控制器（例如ONOS和Beehive）的引入，可扩展性不再被认为是部署SDN解决方案的主要障碍。** 这些进步为新协议打开了大门，这些协议允许控制应用调整它们从交换机获取的数据粒度，我们称之为“软件定义网络2.0”。SDN 2.0将允许在当今网络中无法实现的各种新应用。例如，智能防火墙应用程序可以从整个网络的低开销监视开始，并在识别网络某些部分的异常活动时动态增加发送到控制器的数据包数量。SDN 2.0可用于调试和故障排除网络控制应用程序，这是当今网络中缺少的功能。为此，我们可以增加发送到控制器的流量比例，以进行细粒度分析和故障排除，并减少网络正常运行时的负载。**