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Autor(es) Olivier Bonaventure
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Interdomain routing policies - Influence of peering link type

Consider the network below where the red arrows represent customer->provider peerings and the blue lines shared cost peerings. We consider different policies for the green line.

https://inginious.org/course/cnp3/q-bgp-pol-1/figure.png

Provide your answer as a comma-separated list of paths starting with the preferred one. For example, the answer:

AS9:AS1, AS8:AS7:AS1

indicates that the AS has learned two different paths. The preferred one is the one via AS9 that has a length of 2 AS hops while the second path has a length of 3 AS hops. If there is no path, return 0 as your answer.

Pregunta 1: Interdomain paths

What are the interdomain paths that AS3 has learned to reach the prefix advertised by AS1 in the network above if AS2 is a shared-cost peer of AS3 ?

https://inginious.org/course/cnp3/q-bgp-pol-1/figure1.png
Pregunta 2: Interdomain paths

What are the interdomain paths that AS3 has learned to reach the prefix advertised by AS1 in the network above if AS2 is a customer of AS3 ?

https://inginious.org/course/cnp3/q-bgp-pol-1/figure2.png
Pregunta 3: Interdomain paths

What are the interdomain paths that AS3 has learned to reach the prefix advertised by AS1 in the network above if AS2 is a provider of AS3 ?

https://inginious.org/course/cnp3/q-bgp-pol-1/figure3.png