Split Horizon: how do you disable it ?

Discussion in 'Routing & Switching' started by Headache, Jan 28, 2007.

  1. Headache

    Headache Gigabyte Poster

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    Or enable it, as the case may be.

    Just wondering. Because I haven't yet come across any configs you can use to either to disable split horizon or enable it. I'd like to know because there are a couple of tests I want to carry out on my lab.

    Thanks.
     
    Certifications: CCNA
    WIP: CCNP
  2. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    If I remember correctly, if you want to disable split horizon on an interface, type no ip split-horizon in interface configuration mode. To enable it again, type ip split-horizon in interface configuration mode.
     
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  3. Headache

    Headache Gigabyte Poster

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    Thanks BrainBeacon Michael. I'll try that.
     
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  4. NetEyeBall

    NetEyeBall Kilobyte Poster

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    That is correct. I just checked it out.

    (config-if)#no ip split-horizon

    But why would you want to?
     
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  5. r.h.lee

    r.h.lee Gigabyte Poster

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  6. NetEyeBall

    NetEyeBall Kilobyte Poster

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    Interesting.
     
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  7. Headache

    Headache Gigabyte Poster

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    Hi NetEyeBall,

    Basically, I was reading something about distance vector protocols and decided it would be fun to trigger a routing loop on a lab with a sort of "closed" topology and see how rip and igrp deal with it.

    I haven't had the time to have a proper go of it yet, but the general plan is to put the protocols in and disable split horizon. After that, I plan to shutdown the interfaces on one of the participating routers and hopefully get to see route poisoning and hold-down timers in action.

    Well, that's the plan, anyway.

    @ r.h.lee

    Great link. Thanx.
     
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  8. NetEyeBall

    NetEyeBall Kilobyte Poster

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    Cool...that link is really great. I have been reading through it. Good stuff.
     
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    WIP: CCDA, CCNP, Cisco Firewall

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