软件定义网络与传统网络混杂场景下的地址解析协议代理机制

Address resolution protocol proxy mechanism in hybrid environment of software-defined network and traditional network

在软件定义网络(SDN)与传统网络混杂场景下,针对以太网中最常见的地址解析协议(ARP)请求数据包泛洪问题,提出一种新型的ARP代理机制。该机制利用SDN对全网集中管控的优势,对接入网络中的主机信息进行记录,实时感知主机动态变化和网络故障并动态更新,从而绝大多数ARP请求可由控制器直接响应。仿真结果显示:该机制继承了以太网简单易用的特点,对终端完全透明,与现有的硬件设备兼容,可降低网络的数据流量,并允许网络环路的存在,从而提高了以太网的可扩展性。

To eliminate the most common problem of the flooding of Address Resolution Protocol（ ARP） messages in Ethernet, a new ARP proxy mechanism, taking account of hybrid environment of Software-Defined Network（ SDN） and traditional network was proposed environment. In this mechanism, the advantage of network-wide view of SDN paradigm was used to register hosts information once accessing into the network and update the records in real-time by keeping trace of hosts＇ dynamics and network failure. Thus, most ARP request messages could be responded directly by the controller. The evaluation results show that this proposed scheme reserves the auto-configuration characteristic, which is transparent to hosts, compatible with the existed hardware without any changes, reduces network traffic and allows redundant links existed in network, so as to improve the scalability of the Ethernet.