本文件实现定时器到期的处理，如到达路由发现最大时间，hello定时器到期，路由条目存在时间到期等等。-This document is due to achieve the processing timer, such as route discovery to reach the maximum time, hello timer expires, the routing entries expire so there is time.

In AODV, routes are discovered in an on-demand basis and are maintained as long as they are required. Like DSDV it maintains a sequence number, which it increases each time it finds a change in the topology of its neighborhood. This sequence number e