CCIE职业发展系列典型案列分析之RIP最小更新信息的影响

案例：

说明：

         上图配置用默认用的RIPV1，属性也是默认。

          周期30s更新一次

          如何将路由更新的网络流量减少到最小。

          一种是调整协议的计时器便于降低更新频率（已做过，见RIP协议配置），但是一旦发生故障，会引起较长的收敛时间。

          还有一种方法就是今天要用到的，触发更新。

解决方案：

RT1#config t
RT1(config)#in serial 1/0
RT1(config-if)#ip rip triggered

RT2#config t
RT2(config)#in s1/0
RT2(config-if)#ip rip triggered

这样便使得周期更新变为了触发更新。

下面是DEBUG 信息：

RT2#deb ip rip trigger
RIP trigger debugging is on
*Mar  1 00:42:08.359: RIP: sending triggered request on Serial1/0 to 224.0.0.9
*Mar  1 00:42:08.363: RIP: Start poll timer from 192.168.4.2 on Serial1/0
*Mar  1 00:42:08.367: RIP: sending triggered request on Serial1/0 to 224.0.0.9
*Mar  1 00:42:08.367: RIP: Start poll timer from 192.168.4.2 on Serial1/0
*Mar  1 00:42:08.603: RIP: received v2 triggered update from 192.168.4.1 on Serial1/0
*Mar  1 00:42:08.607: RIP: Stop trigger rip poll timer for 192.168.4.2 on Serial1/0
*Mar  1 00:42:08.607: RIP: Trigger rip running on network 192.168.4.0 thru Serial1/0
*Mar  1 00:42:08.611: RIP: 192.168.4.1 change state from DOWN to INIT
*Mar  1 00:42:08.611: RIP: send v2 triggered flush update to 192.168.4.1 on Serial1/0 with no route
*Mar  1 00:42:08.615: RIP: assigned sequence number 2 on Serial1/0
*Mar  1 00:42:08.623: RIP: received v2 triggered update from 192.168.4.1 on Serial1/0
*Mar  1 00:42:08.759: RIP: received v2 triggered ack from 192.168.4.1 on Serial1/0
     flush seq# 2
*Mar  1 00:42:08.763: RIP: 192.168.4.1 change state from INIT to LOADING
*Mar  1 00:42:08.767: RIP: send v2 triggered update to 192.168.4.1 on Serial1/0
*Mar  1 00:42:08.767: RIP: assigned sequence number 3 on Serial1/0
*Mar  1 00:42:08.771: RIP: Update contains 1 routes, start 1, end 40
*Mar  1 00:42:08.807: RIP: received v2 triggered ack from 192.168.4.1 on Serial1/0
     seq# 3
*Mar  1 00:42:08.811: RIP: 192.168.4.1 change state from LOADING to FULL
*Mar  1 00:42:11.079: RIP-TIMER: sending timer on Loopback0 expired
*Mar  1 00:42:12.951: RIP-TIMER: sending timer on Serial1/0 expired
*Mar  1 00:42:15.775: RIP-TIMER: age timer expired
*Mar  1 00:42:15.883: RIP-TIMER: sending timer on Loopback0 expired

调试的信息显示了2台路由器建立的出发RIP关联关系

序号16  从init to loading

序号22  从loading to full  状态

最后几行可以看到 稳定后  更新计时器正在超时，但是没有更新发送也没有更新收到。

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