Abstract
随着以IPv6为核心的下一代互联网的发展, 现有路由器体系结构在性能、复杂性、扩展能力和节能等方面存在许多难以克服的问题, 特别是随着网络规模的扩展, 如何实现大容量IPv6 FIB(forwarding information base)线速查找是下一代高性能路由器设计面临的重大挑战. 文中提出一种与目前分布转发集中交换结构不同的新型路由器体系结构—MPFS(massive parallel forwarding and switching). MPFS基于FIS(forwarding in switching)思想, 将网络处理器嵌入到可扩展多级交换网络中, 通过流水和分布并行方式实现转发. 与MPP(massive parallel processing)一样, MPFS通过互连大量简单同构的FSN(forwarding and switching node)实现可扩展的转发和交换. 重点研究了MPFS中IPv6 FIB查表问题, 提出了将IPv6 FIB映射到多级FSN上的方法. 模拟和计算表明基于现有DRAM器件和Tree Bitmap查找技术, MPFS可在40 Gbps接口上实现包含1 M个IPv6前缀的FIB的线速查找. 最后提出了一种基于MPFS体系结构的吞吐率为160 Tbps的核心路由器实现方案.
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