RIP Split Horizon


Jack and Joe both have important information to share with each other but they don’t have a direct connection between them. Tori agreed to help out and so they setup a Frame-Relay network to share information. RIP is used as the routing protocol to dynamically learn new networks. Configuring RIP should be straight forward but Joe and Jack are complaining that they are unable to reach other’s networks…time for you to fix it!


  • All IP addresses have been preconfigured for you.
  • Every router has a loopback0 interface:
    Tori: /24
    Joe: /24
    Jack: /24
  • You are not allowed to make any changes to the frame-relay configurations.
  • Configure RIPv2 on all routers, advertise all networks.
  • Ensure router Joe and Jack can see each other’s loopback interfaces. Test this by sending a ping that is sourced from the loopback0 interfaces and destined for the other loopback0 interface.

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You will learn all the secrets about RIP, split horizon, distance vector routing protocols and more.

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RIP Split Horizon

Video Solution:

Configuration Files

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Written by René Molenaar - CCIE #41726

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About the Author: Rene Molenaar

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


  1. Joe can`t send broadcast/multicast updates from multipoint interface if split-horizont is enabled (by default).
    No split-horizont on Joe`s will replicate Tori or Jack broadcast/multicast updates thru 2nd circuit

    1. Be aware…Split horizon doesn’t have anything to do with broadcast or multicast traffic over frame-relay but it’s about distance vector routing protocols (RIP or EIGRP).

      Split horizon prevents advertsing a prefix out of the same interface where it learned the prefix from. In this topology that means router Tori will not advertise a prefix out of the S0/0 interface if it learned that prefix on S0/0.

      The "broadcast/multicast" replication has to do with the "frame-relay map" command. You need to add the keyword "broadcast" to do this.

  2. I understand every thing on video and i executed in my gns3 but i can’t understand that why u configured network with all 0’s in rip protocol on all routers .plzz enlight me .

    1. Using all 0’s means you are advertising all networks, it just a fast way on the lab to configure all networks, imagine you have to type network network network its faster just to type network (only on the lab, never do this on production network)

      Hope its clear.

  3. You are not allowed to make any changes to the frame-relay configurations[b][/b]

    Wasn’t too sure about this requirement, technically it prevents us from adding a frame-relay map statement under the spokes interfaces.

    Update: depending on how you look at it of course

    Anyways, nice post


  4. You said “You are not allowed to make any changes to the frame-relay configurations.” I thought that is another way to ping without using the “frame-relay map” command on router Joe and Jack.

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