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Autores Olivier Bonaventure
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BGP Traffic Engineering

These questions assume that you have read the following article :

B. Quoitin, S. Uhlig, C. Pelsser, L. Swinnen and O. Bonaventure. Interdomain traffic engineering with BGP IEEE Communications Magazine Internet Technology Series, 41(5):122-128, May 2003. http://inl.info.ucl.ac.be/publications/interdomain-traffic-engineering-bgp


Questão 1: BGP Attributes inserted in the import filterWhich of the BGP attributes are typically inserted by import files to influence the selection of the BGP routes inside an AS ?

Which of the BGP attributes are typically inserted by import filters to influence the selection of the BGP routes inside an AS ?

Questão 2: BGP Attributes inserted in the export filter

Which of the BGP attributes are typically inserted by export filters to influence the selection of the BGP routes inside the remote AS ?

Questão 3: Control of the outgoing traffic

Which of the following traffic engineering techniques can be used to control the outgoing traffic of a stub network ?

Questão 4: Control of the incoming traffic

Which of the following traffic engineering techniques can be used to control the incoming traffic of a stub network ?

Questão 5: BGP Communities for traffic engineering

Several network operators have defined BGP Communities that can be used by their customers to control how the routes that they advertise will be ranked inside their own network.

As an example, consider the BGP policy that is specified by Sprint and is described in https://www.sprint.net/index.php?p=policy_bgp

Google's AS number is 15169. Assuming that Google is connected to Sprint, which of the following sentences are valid for a route advertised by a stub that has two links to Sprint.

Questão 6: Internet traffic engineering exercise

You are responsible for AS1. Assume that the Internet topology is the followin g:

AS1 --- AS2 ---- AS4 ----- AS6
 +       +                 +
 +----- AS3 -- AS5 --- AS7 --+

For political reasons, the CEO of your company wants to ensure that AS6 never has a route towards prefix p advertised by AS1. How do you implement this political decision with BGP knowing that your two providers do not support any BGP communities.