This case study is taken from the Orhan Ergun’s CCDE Practical Workbook.In the new version of the workbook there are more than 50 case studies are shared.If you are in the network design field or want to learn about it,don’t miss the book.

Scenario :
Network A is a customer of Network Z, Network B is a peer of Network Z.
Network A becomes transit customer of Network B.
Network A announces 4.0.0.0/16 aggregate to Network Z and more specific prefixes,4.0.0.0/24 and 4.0.1.0/24 to Network B. Network B sends more specific to its peer Z.
Network Z only announces the aggregate to the world. What is the impact of this design ?
How can it be fixed ?

 

bgp peering

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