BGP Aggregation AS SET


You work for a large Dutch webdevelopment company as the senior network engineer. Some of the sites are connected to each other through BGP. One of the network engineers in Hoofddorp has created a summary which aggregates some of the networks from AS 3 and advertises them to AS 1. Unfortunately there is a side-effect because AS 3 installs this summary as well.


  • All IP addresses have been preconfigured for you.
  • Configure EBGP between Tilburg and Hoofddorp.
  • Configure EBGP between Hoofddorp and Haarlem.
  • Configure EBGP between Tilburg and Haarlem.
  • Advertise the networks on the loopback interfaces on router Haarlem.
  • Create a summary on router Hoofddorp that aggregates to network / 16.
  • Ensure AS 3 does not install this summary in its BGP table. You are not allowed to use any filters or prefix/access-lists.

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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BGP Aggregation AS SET

Video Solution:

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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 where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on