Software-Defined Network (SDN), which is recommended as a new generation of the network, a substitute for TCP/IP network, has the characteristics of separation of data plane and control plane. Although the separation of the control plane brings a high degree of freedom and simple operation and maintenance, it also increases the cost of north–south communication. There are many additional modules for SDN to modify and enhance the basic functions of SDN. This paper proposes a message queue-based northbound communication mechanism, which pre-categorizes messages from the data plane and accurately pushes them to the apps potentially interested. This mechanism improves the efficiency of northbound communication and apps’ execution. Furthermore, it supports both OpenFlow and the protocol-independent southbound interface, and it has strong compatibility. Experiments have proved that this mechanism can reduce the control-response latency by up to 41% when compared with the normal controller northbound communication system, and it also improves the network situation of the data plane, such as real-time bandwidth.

中文翻译：

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SDN环境中北向接口的增强型消息分发机制

被推荐作为新一代网络的软件定义网络（SDN），它是TCP / IP网络的替代品，具有数据平面和控制平面分离的特性。尽管控制平面的分离带来了高度的自由度以及简单的操作和维护，但这也增加了南北通信的成本。SDN还有许多其他模块可以修改和增强SDN的基本功能。本文提出了一种基于消息队列的北向通信机制，该机制对来自数据平面的消息进行了预分类，并将其准确地推送到潜在感兴趣的应用程序中。这种机制提高了北向通信和应用执行的效率。此外，它同时支持OpenFlow和独立于协议的南向接口，并且具有很强的兼容性。