改善BGP路由收敛的时间窗口机制

提出了一种时间窗口机制,能够基于路由抖动抑制中路由惩罚值的变化改善BGP(border gateway protocol)路由收敛.这种新机制把来自不同邻居的路由变化情况结合起来,利用BGP路由传播过程形成的路由相关性判断路由在网络中的稳定情况.时间窗口机制使BGP路由器能够更早地发现不稳定路由,优先将稳定路由选择为最优路由,终止路径搜索过程.模拟实验的结果表明,通过选择适当的参数,时间窗口机制能够大大缩短BGP路由收敛延时,减小收敛过程中的通信开销.而且,这种方法不需要在BGP的路由消息中增加额外的信息,因此容易在实际网络中逐步部署.

Time Window Mechanism to Improve BGP Routing Convergence

In this paper,a time window mechanism based on the penalty value of route flap damping is designed to improve routing convergence.This mechanism judges the route stability in the network from BGP (border gateway protocol) routes correlation by observing multiple routes received from different peers jointly.Then BGP speaker can find instable routes earlier and makes stable routes get the chance to be selected earlier in route selection,thus curtail path exploration.Simulation results prove that with proper parameters this method can reduce convergence delay and communication overhead obviously.Furthermore,without addition information in BGP Update message,time window mechanism is a practical method to be deployed in the Internet.