一种基于RIPv2的轻量级IP/SDN混合互联架构

A lightweight hybrid interconnection architecture of IP/SDN based on RIPv2

分析了现有IP/SDN混合互联架构方案的优缺点,提出一个基于RIPv2路由协议的轻量级IP/SDN互联架构.其主要原理是将SDN网络抽象成RIPv2协议中的单个虚拟路由节点,在控制器内部实现RIPv2路由表和Openflow流表信息的转换.从RIPv2的协议角度来看,无论SDN网络内部包含多少个交换机和子网,网络报文穿过该SDN,其跳数只经过1跳.在开源控制器Floodlight上实现了该架构并进行了试验验证和性能评估.与现有架构相比,该架构不需要增加额外的协议转换设备,能够实现与传统IP网络的多出口节点互联,且具有较低的性能开销,适用于中小型园区网的IP/SDN互联场景.

Basing on advantages and disadvantages of existing hybrid interconnection architectures of IP/SDN, a lightweight hybrid interconnection architecture of IP/SDN was proposed based on IPRv2. Its main principle is to abstract single virtual router from the whole SDN network, in which RIPv2 routing table can be transformed from/into flow table by the SDN controller. Theoretically, hop count will only increase by one when network packet gets through SDN domain, despite of the number of switches and subnets SDN domain contains according to RIPv2 protocol. The architecture was successfully implemented based on an open source controller Floodlight, then its functionality and performance were evaluated. Compared with existing architecture, the new architecture can be connected with multiple traditional IP network in the same topology without further conversion equipment, as well as being in low performance overhead, which makes it suitable for small or medium-sized IP/SDN interconnection scenarios.