走向分布式SDN控制:流处理平台间的平台间信令

Francesco Salvestrini, G. Carrozzo, N. Ciulli
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引用次数: 13

摘要

今天的互联网是一系列IP网络的连接,这些网络通过集成到大量高度专业化的中间盒中的许多分布式功能相互连接。这些元素实现了复杂的网络功能,如防火墙、nat、DPI、流量扫描等。该产品是一个相当复杂和严格的互联网络系统,在这个系统中,网络管理员和用户无法轻易确定流量流向目的地时发生了什么。SDN研究和流处理和虚拟化的可编程网络功能正在解锁当前的场景,尽管大多数COTS产品通常只支持IP网络上的虚拟L2交换(例如VXLAN, GRENV, STT)和基于LAN的流定位的网络功能。本文提出了通过分布式SDN控制器和平台间信令实现流处理的不同视角。相邻流处理平台之间的分布式端到端服务供应是通过一个信令框架实现的,在这个信令框架中,每个平台要执行的不同动作/功能在一个通用的流处理路由(flow processing Route, FPR)对象中进行描述。FPR在SDN控制器之间通过端到端网络服务路径进行交换,并包含在不同平台上实例化的路由规则和本地流处理操作的信息。提议的信令架构已经在FP7-ICT CHANGE项目中设计和实现。本文报告了信令体系结构的关键方面和开发的信令原型。
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Towards a Distributed SDN Control: Inter-Platform Signaling among Flow Processing Platforms
Today's Internet is a concatenation of IP networks interconnected by many distributed functions integrated into a plethora of highly specialized middleboxes. These elements implement complex network functions like firewalls, NATs, DPI, traffic scrubbing, etc. The product is a quite complex and rigid internetworking system in which network administrators and users cannot easily determine what is happening to traffic flows as they go toward destinations. SDN research and programmable network functions for flow processing and virtualization are unlocking the current scenario, though most of the COTS products generally support network functions only for virtual L2 switching over IP networks (e.g. VXLAN, GRENV, STT) and LAN based flow pinpointing. This paper presents a different perspective for implementing flow processing via distributed SDN controllers and inter-platform signaling. The distributed end-to-end service provisioning among adjacent flow processing platforms is implemented via a signaling framework in which the different actions/functions to be executed by each platform are described in a generic Flow Processing Route (FPR) object. The FPR is exchanged among the SDN controllers over the end-to-end network service path and contains information on routing rules and local flow processing actions to be instantiated at the different platforms. The proposed signaling architecture has been designed and implemented in the FP7-ICT CHANGE project. This paper reports on the key signaling architectural aspects and the developed signaling prototype.
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