| 摘要: |
| 随着传统体系结构路由器在可靠性和多维可扩展性等方面不能满足下一代Internet发展的需要,集群结构的路由器将成为未来骨干网络的核心.如何保证集群路由器各个路由节点转发表的单映像性,对控制平面及转发平面的性能至关重要,是值得研究的重要问题.在分析现有的各种转发表同步机制特点的基础上,提出一种非对称的路由同步框架--AREF(asymmetrical routes electing fTamework)路由同步框架,更适合于大规模异构的集群路由器系统的特点.在AREF路由同步框架上,进一步提出了AREF路由同步算法.算法针对每个路由前缀使用路由Cache来缓存次优路由,在全局最优路由被删除时,通过预测次优路由来减少同步开销.模拟实验表明,AREF同步框架与算法的性能远远优于其他路由同步机制,与理论最优值比较接近. |
| 关键词: 集群路由器 单映像 路由同步 路由项 转发表 路由缓存 |
| DOI： |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos.90104001,90204005,90412011(国家自然科学基金);the National Grand Fundamental Research 973 Program of China under Grant No.2003CB3148020(国家重点基础研究发展规划(973));the National High-Tech Research and Development Plan of China under Grant No.2005AAl21570(国家高技术研究发展计划(863)) |
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| A Synchronization Framework and Critical Algorithm Maintaining Single Image of IP Forwarding Tables Among Cluster Router's Nodes |
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ZHANG Xiao-Zhe,LU Xi-Cheng,ZHU Pei-Dong,PENG Wei
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| Abstract: |
| With the rapid development of Internet, traditional centralized routers can not meet the requirements of next generation Internet on reliability, performance scalability and service scalability. Cluster routers will be the most important components of future Internet. It is very important for cluster routers to maintain the same forwarding table images among cluster router nodes. Different synchronization mechanisms have variant performance to control plane and packet forwarding plane. After the analysis of two typical synchronization mechanisms, this paper proposes an asymmetrical forwarding table synchronization framework — AREF (asymmetrical routes electing framework) synchronization framework. It fits the requirements of massively parallel cluster routers architecture perfectly. Continuous route flapping of the backbone network burdens the synchronization mechanisms of cluster routers. AREF synchronization algorithm is proposed to decrease the synchronization costs of AREF synchronization framework during route flapping. It uses route cache to predict a new best route when the original best route is deleted, and reduces the synchronization cost of AREF synchronization framework greatly. AREF synchronization framework and algorithm requires diverse abilities for different routing node types and can be used in heterogeneous cluster router widely. |
| Key words: cluster router single image route synchronization route prefix forwarding table route cache |
