BGP Aggregation


Scenario:

John and Jim are setting up their own ISP and start by configuring BGP between their routers. Because they want to make sure not to advertise too many prefixes they want to configure BGP aggregation. It’s up to you to make it happen.

Goal:

  • All IP addresses have been preconfigured for you.
  • Configure EBGP between router John and Jim. Pick whatever AS you like.
  • Advertise all loopback interfaces on router Jim in BGP.
  • Create a summary for the loopback interfaces on router Jim. Ensure you don’t have any overlapping address space.
  • In the future you will add networks with the 20.0.0.0 /8 address space. Create a summary for this range on router John and advertise it in BGP. You are not allowed to configure it on any loopback interfaces.

It took me 1000s of hours reading books and doing labs, making mistakes over and over again until I mastered all the protocols for CCNP.

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IOS:

c3640-jk9s-mz.124-16.bin

Topology:

BGP Aggregation

Video Solution:

Configuration Files

You need to register to download the GNS3 topology file. (Registration is free!)

Once you are logged in you will find the configuration files right here.

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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 GNS3Vault.com where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on http://networklessons.com

6 Comments

  1. Hello,

    To solve this lab were you looking for a static route that point to null 0 for the 23.0.0.0/8 network?

  2. I’m also not sure but that was the way I did it as well. Put a static route pointing to null0 and then redistribute static… Thanks for another cool lab

    1. Hi Guys,

      Yes that’s the trick, it has to be in the routing table somehow in order for BGP to advertize it. Creating a static route and pointing it to the null0 interface works fine!

      Rene

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