铁路数据网路由汇聚引发的路由迭代问题研究

Research on Routing Iteration Caused by Routing Aggregation in Railway Data Network

基于铁路数据网的路由规范,铁路局区域网络核心路由器之间需要将IP地址进行路由汇聚之后才能够相互宣告,路由汇聚使铁路数据网路由信息的发布更加简洁、合理。然而,路由汇聚也容易产生安全隐患。结合广州局铁路数据网工程建设和网络维护的经验,针对静态路由的下一跳IP地址被路由迭代到路由汇聚产生的黑洞路由之上,导致静态路由不会失效,冗余主备静态路由无法自动切换的问题,提出了静态路由绑定BFD双向转发检测机制的优化方案并予以实施,解决了路由汇聚引发的路由迭代问题,避免影响铁路数据网业务数据包的正常转发。

Based on the routing specification of the railway data network,the core routers of the regional network of the railway administration need to summary the lP addresses before they can make advertiscement to each other.The route data aggregation makes the release of the routing data of the railway data network more concise and reasonable.However,the route data aggrega-tion is also prone to create unexpected security risks.Based on the experience of data network en-gineering construction and network maintenance in Guangzhou railway administration,a study is made on the problen that the next hop lP address of static route is iterated over the black hole route generated by route aggregation,which leads to the failure of static route and the failure of automatic switching of redundant main and standby static routes.This paper proposes and imple-ments an optimum scheme of static route binding BFD bidirectional forwarding detection mecha-nism,which can solve the problem of route iteration caused by route summarization and avoid af-fecting the normal forwarding of service packets in railway data network.