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RIP：路由信息协议 (RIP: Routing Information Protocol)

RIP is also an abbreviation of the Routing Information Protocol. The Routing Information Protocol is one of the oldest distance-vector dynamic routing protocols. It uses a hop count as a primary routing metric. In the case of hop count, RIP averts routing loops executing a restriction on the number of nodes that are enabled and counted between source and destination. The highest number of hops permitted for RIP is 15, which restricts the size of networks that can be maintained by RIP. According to the RIP hop limit, the hop count 0 indicates a network that is without any deviation linked to the route, the hop count 16 indicates a network that is not reachable.

RIP也是“路由信息协议”的缩写 。 路由信息协议是最古老的距离矢量动态路由协议之一。 它使用跳数作为主要路由度量。 在跳数的情况下， RIP避免对在源和目标之间启用并计数的节点数量执行限制的路由循环。 RIP允许的最大跳数为15，这限制了RIP可以维护的网络的大小。 根据RIP跳数限制，跳数0表示没有与路由链接的任何偏差的网络，跳数16表示不可达的网络。

In the form of the transport protocol, RIP uses User Datagram Protocol (UDP). It is allocated a reserved port number which is 520. Inside a local area network (LAN) or classified group of LANs, RIP is a broadly used protocol for controlling and organizing router information.

RIP以传输协议的形式使用用户数据报协议(UDP)。 它分配有一个保留的端口号520。在局域网(LAN)或LAN的分类组中，RIP是用于控制和组织路由器信息的广泛使用的协议。

RIP的功能 (Features of RIP)

• Periodically, the updates of the network are always interchanged.

  定期地，网络的更新总是互换的。

• Information updates of routing are always broadcasted.

  路由的信息更新总是广播的。

• The tables of complete routing are sent in updates.

  完整路由表在更新中发送。

• The routing information received by adjacent routers is always trusted by Routers. This is also called as Routing on rumors.

  相邻路由器接收的路由信息​​始终受路由器信任。 这也称为谣言路由。

路由信息协议(RIP)的版本 (Versions of Routing Information Protocol (RIP))

Following are the three versions of Routing Information Protocol,

以下是路由信息协议的三个版本，

1. RIP version 1

   RIP版本1

   RIP version 1 is known as Classful Routing Protocol because, in its routing updates, it doesn't send information of subnet mask.

   RIP版本1被称为有类路由协议，因为在其路由更新中，它不发送子网掩码的信息。

   1. RIP v1 allowed interface sends an update as broadcast.
   2. RIP v1 broadcast at 255.255.255.255 a request message.
   3. The authentication of update request messages doesn't support RIP v1.

2. RIP version 2

   RIP版本2

   RIP version 2 is known as Classless Routing Protocol because, in its routing updates, it sends information of subnet mask.

   RIP版本2被称为无类路由协议，因为它在路由更新中发送子网掩码的信息。

   1. RIP v2 allowed interface sends an update as multicast.
   2. RIP v2 multicast at 224.0.0.9, to the complete routing table to all adjoining routers.
   3. The authentication of update request messages is supported by RIP v2.

3. RIPng (RIP next generation)

   RIPng(下一代RIP)

   1. RIPng sends an update as a multicast.
   2. RIPng multicast at FF02::9.
   3. RIPng maintains on IPv6 networks.
   4. The authentication of update request messages doesn't support by RIPng.

RIP计时器 (RIP Timers)

• Update timer: Periodically, the routers exchange their routing table by using the update timer.

  更新计时器 ：路由器定期使用更新计时器交换其路由表。

• Invalid timer: If no update came to 180 seconds, then the destination router considered invalid. In this case, the destination router mark hop counts as 16.

  无效计时器 ：如果没有更新到180秒，则目标路由器被视为无效。 在这种情况下，目标路由器标记跃点数为16。

• Hold down timer: The router waits for the adjacent router to respond at this time. If no response in the given time, then it is declared dead. By default, it is 180 seconds.

  按下计时器 ：路由器此时等待相邻路由器响应。 如果在给定时间内没有响应，则宣布为无效。 默认情况下为180秒。

• Flush time: The entrance of the route will be flushed at this time.

  冲洗时间 ：此时将冲洗路线的入口。

翻译自:

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