隧道传输系统中基于表项优化的高效转发模型

An Effective Forwarding Model for Tunneling Transmission System Based on Table Optimization

异构网络环境中,隧道报文在路由器数据层的处理涉及多次不同表项查找,报文转发时延和表项存储容量都面临着极大的挑战。该文主要研究隧道报文处理的核心功能及各项功能步骤间的关联,提出了表项聚合和表项拆分理论,并分析了二者的效用、代价及适用场景。并设计了基于表项优化的隧道设备高效转发模型,针对4over6过渡网关给出了具体实现方法。原型系统实验和分析证明了隧道网络表项优化机制和理论的正确性、高效性。表项优化研究也为其他网络设备的各类表项处理优化提供了重要参考。

The property that multi-lookup forwarding tables on data layer poses a demanding challenge to forwarding time-delay and device storage consumption in heterogeneous network system. To deal with the problem, this paper proposes a theory of aggregation and split model based on forwarding table by analyzing the kernel functional modules and relations inner the tables. The application scenarios of the theory are studied and the model is applied to 4over6 transition gateway to transition from IPv4 to IPv6. The prototype system test results verify that the optimization model using aggregation and split is more effective than that non-use. The proposed model could be a reference to other related researches.