CCIE or Null!

My journey to CCIE!

CCIE Challenge 1: Manipulating EIGRP Routing

with 6 comments

So last week (Well actually months ago at this point) I was helping out one of buddies who is working on his ROUTE exam and he was working through an EIGRP load sharing lab involving the variance command and interface metrics, after I read through the lab and looked at the requirements I came up with a completely different way to complete lab then what was expected. So I figured I would alter the lab and post it up here:

EIGRP Challenge


  1. You want R1 to load share over links Serial0/0 and Serial0/1 that connect to R2 to reach the /32 prefix on R3.


  1. You cannot make any configuration changes to R1.
  2. You cannot create any static routes.
  3. You cannot create any additional interfaces.
  4. You cannot configure any additional routing protocols. (IE: OSPF, BGP, etc)
  5. You cannot change any AS types.
  6. You cannot change which EIGRP ‘k’ values are being used.
  7. You cannot change any of the metrics on the existing interfaces.
  8. The solution must involve EIGRP.

You can download the starting configurations here:

There is also a GNS3 .Net file included in there as well.

Have Fun!

Written by Stephen J. Occhiogrosso

June 3, 2013 at 6:42 PM

6 Responses

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  1. Hi,

    I created a route-map on router 2, matched the prefix and changed the metric there. Is that the solution?

    I know the rules says that you can’t change the metric on the existing interface, but i didnt change it on the interface, I changed it only for that prefix.

    Let me know and please post more such questions.


    Jay Lohano

    June 12, 2015 at 8:12 PM

  2. I configured a summary route of on S2/2 interface so that R1 will load balance among S2/0 and S2/1 because of Longest match rule and in case of a failure of both links s2/2 will be used.

    i think this solution fulfills the all above requirements of the Lab.

    Muhammad Arshad

    December 10, 2015 at 12:22 PM

  3. offset-list out at R2 with value
    match only prefix

    Is it correct?

    Keng Ronnapop

    May 23, 2016 at 2:50 AM

  4. Hi, first of all I would like to thank you for this web page, also i would like to know how can I check if some router is using an offset-list ??

    Because when I used the offset-list on R2 it is changed on R1 but the first Feasible Distance FD before the offset-list still there even when I modified all… I don´t know if you understand what Im talking about but here it is.

    Before offset-list

    P, 1 successors, FD is **** 3165440 ****
    via (****3165440****/409600), Serial1/0
    via (20665600/409600), Serial1/2
    via (5665536/409600), Serial1/1

    After offset-list , the new value is “5665536” but I still seeing the first FD “3165440”

    R1#show ip eigrp topology

    P, 2 successors, FD is 3165440, serno 18
    via (***5665536***/409600), Serial1/1
    via (***5665536***/2909696), Serial1/0
    via (20665600/409600), Serial1/2

    Where I can see that some router is using offset-list ??

    Best Regards,


    April 8, 2017 at 10:27 PM

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