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Author(s) Olivier Bonaventure
Deadline No deadline
Submission limit No limitation
Category tags BGP

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Interdomain routing policies - A more complex topology

Consider the simple interdomain topology shown below. In this exercise, we will compute the path from AS3 to AS1. For this, we need to build the routing tables of the other ASes in the topology.

https://inginious.org/course/cnp3/q-bgp-pol-4/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 paths

What are the interdomain paths that AS2 has learned to reach the prefix advertised by AS1 ?

Question 2: Interdomain paths

What are the interdomain paths that AS4 has learned to reach the prefix advertised by AS1 in the network ?

Question 3: Interdomain paths

What are the interdomain paths that AS5 has learned to reach the prefix advertised by AS1 in the network above ?

Question 4: Interdomain paths

What are the interdomain paths that AS3 has learned to reach the prefix advertised by AS1 in the network above ?