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Another interesting utilization IPMininet_ is to explore the impact of a link failure. We start from a small variant of the above topology.
When this network starts, all hosts can reach all other hosts.
Draw the network and try to predict how it will react to a shutdown of any of the customer-provider links ?
What are the BGP messages that will be exchanged when the link between ``AS1`` and ``AS2`` fails ? How does this affect the reachability of the different hosts ?
What are the BGP messages that will be exchanged when the link between ``AS1`` and ``AS3`` fails ? How does this affect the reachability of the different hosts ?
What are the BGP messages that will be exchanged when the link between ``AS1`` and ``AS5`` fails ? How does this affect the reachability of the different hosts ?
What are the BGP messages that will be exchanged when the link between ``AS3`` and ``AS4`` fails ? How does this affect the reachability of the different hosts ?
Let us now consider another example. The network contains nine ASes with one host per AS. Assuming that ``AS9`` announces prefix `p9` and that ``AS2`` announces prefix `p2`.
What is the Loc-RIB of ``AS6`` for prefix `p9` ? Indicate which is the best route towards this prefix.
What is the Loc-RIB of ``AS9`` for prefix `p2` ? Indicate which is the best route towards this prefix.
The network below contains nine ASes with one host per AS. Assuming that ``AS1`` announces prefix `p1` and that ``AS2`` announces prefix `p2`.
What is the Loc-RIB of ``AS6`` for prefix `p1` ? Indicate which is the best route towards this prefix.
What is the Loc-RIB of ``AS8`` for prefix `p2` ? Indicate which is the best route towards this prefix.
Let us now consider another example, also implemented using an IPMininet_ script. The network contains eight ASes with one host per AS. This small Internet is shown below and the script is available from :download:`/exercises/ipmininet_scripts/ebgp-bug-3.py`.
The network does not provide a full connectivity. The hosts attached to ``AS5`` cannot ping the hosts attached to ``AS8``.
What is the path that packets follow from a host attached to ``AS1`` to a host attached to ``AS8`` ?
What is the path that packets follow from a host attached to ``AS8`` to a host attached to ``AS1`` ?
What is the path that packets follow from a host attached to ``AS8`` to a host attached to ``AS2`` ?
What is the path that packets follow from a host attached to ``AS2`` to a host attached to ``AS7`` ?
We now disable the interdomain link between ``AS3`` and ``AS4``. What are the hosts that ``AS1``, ``AS5`` and ``AS6`` are still able to ping ?

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read-only
Source string location
../../exercises/routing-protocols.rst:1327
String age
3 years ago
Source string age
3 years ago
Translation file
locale/pot/exercises/routing-protocols.pot, string 89