模拟使用距离向量算法的路由器,计算最短路由，输出邻居列表,分组设定生存时间，超过生存时间被丢弃，需要重新发送分组。-Simulation using the distance vector algorithm routers, computing the shortest route, the output neighbor list, the survival time of group setting, more than the survival time is discarded, need to re-send the packet.