Tearing down the Protocol Wall with Software Defined Networking

J. Crowcroft, H. Oliver, Yitzhak Bar-Geva
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引用次数: 3

Abstract

The letter of the law of Software Defined Networking (SDN) is the OpenFlow specification, combined with appropriate controllers. The spirit of the law of SDN affords much more potential for innovation. We take the position that the future of communications is at stake unless the Protocol Wall is overcome. By "Protocol Wall" we mean the artificial barrier which, until recently, has been placed between the inflexible, protocol-bound communications space, and the application space in which far fewer constraints are placed on the programmer and in which far more innovative results can be achieved. Overcoming the Protocol Wall allows fully programmable, software-defined behaviour in both the data plane and the control plane, and opens the way for much-needed innovations in networking. In the stereotypical case, of which sockets are an example, the application functionality and the physical layer are separated between kernel and user respectively, with the kernel below the transport service layer, and the application above it. Archetypically, the router and host are separated between Internet Protocol (IP) and Transmission Control Protocol (TCP) respectively, where IP is responsible for hop-by-hop forwarding and TCP for end-to-end services. The Protocol Wall between application functionality and the physical layer constitutes a hegemony over innovation which is not being challenged sufficiently by current SDN approaches. We assert that the realisation of unconstrained Software Defined Networking is closer at hand than anyone has yet acknowledged, and that networking can be evolved more quickly if we are guided by the spirit of the law of SDN. User mode network software, running on today's commodity and specialised communications hardware, can safely support satisfactory performance, while opening up potential for the same very high rate of innovation in networking as has been seen in appliances - for example, in smart mobile devices - in recent years.
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用软件定义网络拆除协议墙
软件定义网络(SDN)法则的核心是OpenFlow规范,加上适当的控制器。SDN法则的精神为创新提供了更多的潜力。我们的立场是,除非协议墙被克服,否则通信的未来将受到威胁。所谓“协议墙”,我们指的是直到最近才被放置在不灵活的、受协议约束的通信空间和应用程序空间之间的人工屏障,在应用程序空间中,对程序员的限制要少得多,并且可以实现更多的创新结果。克服协议墙允许在数据平面和控制平面上实现完全可编程的、软件定义的行为,并为急需的网络创新开辟了道路。在以套接字为例的典型情况下,应用程序功能和物理层分别在内核和用户之间分离,内核在传输服务层下面,应用程序在其上面。典型地,路由器和主机分别在互联网协议(IP)和传输控制协议(TCP)之间分离,其中IP负责逐跳转发,TCP负责端到端服务。应用程序功能和物理层之间的协议墙构成了对创新的霸权,目前的SDN方法还没有充分挑战它。我们断言,不受约束的软件定义网络的实现比任何人都认识到的更接近,如果我们以SDN法则的精神为指导,网络可以更快地发展。用户模式网络软件,运行在今天的商品和专门的通信硬件上,可以安全地支持令人满意的性能,同时为网络创新开辟了潜力,就像近年来在家电(例如智能移动设备)中看到的那样。
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