路由信息协议（英语：Routing Information Protocol，缩写：RIP）是一种内部网关协议（IGP），为最早出现的距离矢量路由协定。属于网络层，可以通过不断的交换信息让路由器动态的适应网络连接的变化，这些信息包括每个路由器可以到达哪些网络，这些网络有多远等。

虽然RIP仍然经常的被使用，但大多数人认为它将会而且正在被诸如OSPF和IS-IS这样的路由协议所取代。当然，我们也看到EIGRP，一种和RIP属于同一基本协议类但更具适应性的路由协议，也得到了一些使用。

The Routing Information Protocol (RIP) is one of the oldest distance-vector routing protocols which employ the hop count as a routing metric. RIP prevents routing loops by implementing a limit on the number of hops allowed in a path from source to destination. The maximum number of hops allowed for RIP is 15, which limits the size of networks that RIP can support. A hop count of 16 is considered an infinite distance and the route is considered unreachable. RIP implements the split horizon, route poisoning and holddown mechanisms to prevent incorrect routing information from being propagated.