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BGP Transit AS

Written by Rene Molenaar on . Posted in BGP

Scenario:

Tillywood is one of the major movie studios located in Tilburg, The Netherlands. You are working there as a junior network engineer and assigned at the BGP team. One of the trainees has configured part of the network which has a transit AS but he has trouble sending packets between AS 1 and AS 3. Can you show him how it's done?

Goal:

  • All IP addresses have been preconfigured for you as specified in the topology picture.
  • Configure EBGP between AS 1 and AS 2.
  • Configure EBGP between AS 2 and AS 3.
  • Configure IBGP within AS 2.
  • Ensure AS 1 and AS 3 can reach each others loopback interfaces.

IOS:

c3640-jk9o3s-mz.124-16.bin

Topology:

BGP Transit AS

Video Solution:

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Comments (3)

  • avatar
    bluecavalry

    Hi Rene,
    On the final part of this task, you redistributed OSPF....and explained the precaution against it.

    I actually made a static route for the unknown routes On either side.
    (192.168.12.x and 192.168.56.x)

    I am wondering if this was okay for the task. It worked.
    Mark

  • avatar
    ReneMolenaar

    Hi Mark,

    Using static routes will work and most of the times using a static route will fix any problem. The downside of this solution is that it's not "dynamic". If anything happens to your topology (router or link failure) a dynamic routing protocol can recover from this.

    Static routes will stay in your config with the risk of "blackholing" traffic.

    So yes it'll work, but it's not the best solution.

  • avatar
    bongklah

    I also applied static on Bullock and Roberts, that resolved the issue. I also tested the other method of advertising the only the needed routes with bgp and that fixed the issue. So there are multiple approaches to fixing the problem.

    I hope this helps.

    Best regards,