RIP Triggered Updates


Harry and Sara are network consultants and studying for their CCIE R&S certification. They both have a router and they are running RIP on the serial link to exchange routing information. Their ISP charges them for each byte sent so they want to make sure RIP doesn’t send any unnecessary traffic.


  • All IP addresses have been preconfigured for you.
  • Both routers have a loopback interface as following:
    Configure RIP version 1 on both routers, achieve full connectivity for all networks (including the loopbacks).
  • Ensure RIP only sends updates when unnecessary.
  • Sara and Harry would like to know how they can see this configuration is active without looking at the running- or startup-config. Can you help them?

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RIP Triggered Updates

Video Solution:

Configuration Files

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Once you are logged in you will find the configuration files right here.

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Written by René Molenaar - CCIE #41726

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René - CCIE #41726 is the creator of where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on


  1. ip rip triggered (under the serial interfaces)

    use “show ip protocols” to see that triggered update for RIP is active. It will say “YES” under the column Triggered RIP 🙂

  2. This works to disable the regular updates… But when I shut down one of the loopback interfaces, it never sends any flash updates. Eventually, the subnet disappears from the other routers route table, even though no updates are sent.

    Also, if the "ip rip triggered" interface command is removed, updates are still not being sent. To get them working again, I have to remove "router rip" and add it back in.

    Anybody else experience this?

  3. *Jun 8 23:02:27.903: RIP: received v2 triggered update from on Serial1/0

    Works for me !

    Thanks Rene, Like you said one of those things you need to know for the CCIE lab.


  4. When I completed above configuration then I try to “do clear ip route *”.

    After that, I typed “do show ip route”. There is no routing table information.

    I can’t ping from Sara’s to

    Also I can’t ping from Harry to

    Anyone would you explain this one?

  5. in Goals:
    •Ensure RIP only sends updates when unnecessary.
    •Ensure RIP only sends updates when (un)necessary.

  6. Well
    i jut imported the final configuration after download from above link. Loop-back interface in the routing table learning from rip are disappeared at both end and there no trigger updates are being sent.
    Please help

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