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GNS3 Lab & Exercise: EIGRP & OSPF Route Manipulation

Written by LBSources from http://www.gns3-labs.com on June 26th, 2010 | 8 Comments

So here is another lab I put together based on some studies and reading recently. I basically put together the scenario, so if it’s lacking conveying the scenario in a professional manner, I apologize :)

This is basically a simple route redistribution and route manipulation lab. Simple, but requires a few steps that will test your ability to adapt to an already deployed network while implementing a new routing protocol.

Hope you enjoy! :)


Scenario

Company Tapan wants to enable EIGRP AS 1 on R1, R2 and R3. They would like to connectivity between all routers and subnets with the exception of the loopback interface on R1. R3 should NOT be able to communicate with R1′s Loopback interface. Unfortunately Tapan cannot eliminate advertisement of R1′s Loopback interface due to other network dependecies on the other side of R1 (unseen here).

Additionally Tapan is planning to segment the networks between R1, R2 and R3 using OSPF. They would like 2 OSPF areas. The OSPF area between R1 and R2 will be the core (Area 0). The area between R2 and R3 will be Area 1.

Tapan has determined that they’d like to reach R1′s loopback via OPSF. Tapan would like that R1′s Loopback interface be reachable via OSPF ONLY.

Tapan has hired you as the network consultant to configure their required network scenario.

When R3 can communicate with R1′s Loopback using the scenario above, your job is done.

Because R1 is a bit inflexible, the IP and EIGRP configuration is already in place and CANNOT be changed. Only OSPF can be configured on R1 to R2.

Routers Used: 3640

IOS: c3640-ik9o3s-mz.124-25b

Feature of Topology: EIGRP, OSPF, Route Redistribution

Image:

Download: GNS3-Labs – EIGRP & OSPF Route Manipulation.zip

Enjoy .. LBS

Disclaimer:

I perform all of these labs on my own using my own knowledge and experience (warning and disclaimer). They may very well be implemented differently than a method you might choose. So long as it meets the requirements and works, essentially it’s acceptable (In my feeble opinion). But if you notice a terribly or complicated method used by me to achieve the goals and you feel yours is much easier, makes sense or is the standard; please do share – I’m always open to learning :)

P.S. If you would like to donate for the time it takes to do all of this, feel free to use the link below. Thank you in advance for any contribution you make :)


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8 Responses to “GNS3 Lab & Exercise: EIGRP & OSPF Route Manipulation”

  1. avatar Angie

    Hola, me gustaría conocer los scripts de configuración con el ánimo de entender el ejercicio, además no conozco la forma para ingresar al ios de los routers??? Cómo es el proceso? Manejo tracer maker pero no gns3…

  2. avatar OmiBarbosa

    Good lab and easy as well. My difference between the solution configs is that instead of applying an implicit deny on R2 for any other subnet beside 172.16.0.0, I configured a specific ACL for R1′s loopback and denied it out towards R3 in EIGRP AS1.

    Thanx from Puerto Ri!co

  3. avatar siddiqui

    hi all,
    great lab, and solved easily..i have also configured the R1 lo to be a separate access list just to save some overhead on the router…am missing something here about the redistribution.
    when the lo was in eigrp AS 1, it was catched by the access list and denied under eigrp, but the moment you inject the lo into ospf the route can be seen on R3 (good so far) , for my own curiousity I tried to creat another access list to deny the same lo to be seen in R3 and applied it on ospf process 1 and it never worked, I want to know if thats a limitation on IOS or is this how ospf behave on multi protocol networks….please share if you have tested this out.

  4. avatar Javier Offill

    Wow, awesome blog layout! How long have you been blogging for? you made blogging look easy. The overall look of your site is wonderful, as well as the content!. Thanks For Your article about GNS3 Lab & Exercise: EIGRP & OSPF Route Manipulation | GNS3 Labs :: Cisco Router Simulator Network Labs & Topologies .

  5. avatar Jaime Noorda

    Wow, wonderful blog layout! How long have you been blogging for? you made blogging look easy. The overall look of your site is fantastic, as well as the content!. Thanks For Your article about GNS3 Lab & Exercise: EIGRP & OSPF Route Manipulation | GNS3 Labs :: Cisco Router Simulator Network Labs & Topologies .

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  8. avatar Trent

    So, this is a fairly easy lab, and is good to test your skills with either a route-map or distribute list command. Since there are a few ways to solve this, it gets you thinking, although it does ask you to use a distribute list. 
    I feel that the lab is not specific enough for what it is trying to accomplish. Can anyone enlighten me as to why you would want to run 2 different protocols for the same devices advertising the same networks?
     
    Thanks. 



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