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Author(s) Olivier Bonaventure
Deadline Καμία προθεσμία
Submission limit No limitation
Category tags bgp

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Interdomain routing - AS_PATH

In the small Internet shown below, AS4 announces one prefix : 2001:db8:4/48. There are no routing policies in this small Internet.

https://inginious.org/course/cnp3/q-bgp-pol-0/figure.png

Provide your answers 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.

Question 1: Interdomain routes

Assuming that all the links are up and the network has converged, what are the routes known towards this prefix in AS3 ?

Question 2: Paths in ``AS1``

Assuming that all the links are up and the network has converged, what are the routes known towards this prefix in AS1 ?

Question 3: Paths in ``AS2``

Assuming that all the links are up and the network has converged, what are the routes known towards this prefix in AS2 ?

Question 4: Paths in ``AS5``

Assuming that all the links are up and the network has converged, what are the routes known towards this prefix in AS5 ?