cnp3-ebook/exercises/routing-protocols

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63 ../../exercises/routing-protocols.rst:861
	English The ``UPDATE`` message can be used to withdraw and advertise routes. The packet below is sent by ``AS2`` to advertise its route towards `2001:cafe:2::/48` on the BGP session with ``AS1``.
	French 0/1870 · 187 Needs editing
64 ../../exercises/routing-protocols.rst:866
	English Another interesting utilization of IPMininet_ is to explore how routers react to link failures. We start from the same network as with the previous example and disable the link between ``AS2`` and ``AS3``. For this, we log on one of the two routers and issue the following commands.
	French 0/2820 · 282 Needs editing
65 ../../exercises/routing-protocols.rst:898
	English We first connect to the BGP daemon on router `as2`. In addition to the `show` commands that have been described earlier, the router also supports privileged commands that can change its configuration. Before executing these commands, we must enter the privileged mode with the `enable` command. On production routers, this command requires a password to verify the credentials of the network administrator. The `#` prompt indicates that we are allowed to execute privileged commands. We first check the state of the BGP sessions with the `show bgp summary` commands. There are two BGP sessions configured on this router.
	French 0/6200 · 620 Needs editing
66 ../../exercises/routing-protocols.rst:900
	English We can now disable one of the BGP sessions on router `as2` as follows.
	French 0/700 · 70 Needs editing
67 ../../exercises/routing-protocols.rst:911
	English We start indicate that we will use the terminal to change the router configuration with `configure terminal`. We then enter the BGP part of the configuration with `router bgp 2` (`2` is the AS number of `as2`). Then we use the `neighbor 2001:cafe:2:23::3 shutdown` that takes as parameter the IP address of the peer of the session that we want to stop. We then leave the BGP part of the configuration (first `exit`) and the configuration menu (second `exit` command). At this point, the BGP session between ``AS2`` and ``AS3`` is down.
	French 0/5350 · 535 Needs editing
68 ../../exercises/routing-protocols.rst:930
	English Without a BGP session between ``AS2`` and ``AS3``, there are reachability problems in this simple Internet.
	French 0/1070 · 107 Needs editing
69 ../../exercises/routing-protocols.rst:941
	English We can fix them by enabling again the BGP session with the `no neighbor 2001:cafe:2:23::3 shutdown` command.
	French 0/1080 · 108 Needs editing
70 ../../exercises/routing-protocols.rst:989
	English Exercises
	French 0/100 · 9 Needs editing
71 ../../exercises/routing-protocols.rst:991
	English We can use IPMininet_ to prepare some networks with problems that need to be analyzed and corrected.
	French 0/1000 · 100 Needs editing
72 ../../exercises/routing-protocols.rst:993
	English Our first example is a small Internet with 5 ASes. A subset of the script that configures this network is shown below. There is one host attached to each AS and this host has the same number as its AS. The entire script is available from :download:`/exercises/ipmininet_scripts/ebgp-bug.py`.
	French 0/2910 · 291 Needs editing
73 ../../exercises/routing-protocols.rst:1016
	English When this network is launched, `ping6all` reports connectivity problems. Hosts `h1` and `h4` cannot exchange packets. Can you fix the problem by changing the routing policy used on only one interdomain link ? Justify your answer
	French 0/2280 · 228 Needs editing
74 ../../exercises/routing-protocols.rst:1029
	English Another interesting utilization IPMininet_ is to explore the impact of a link failure. We start from a small variant of the above topology.
	French 0/1390 · 139 Needs editing
75 ../../exercises/routing-protocols.rst:1052
	English When this network starts, all hosts can reach all other hosts.
	French 0/620 · 62 Needs editing
76 ../../exercises/routing-protocols.rst:1066
	English Draw the network and try to predict how it will react to a shutdown of any of the customer-provider links ?
	French 0/1070 · 107 Needs editing
77 ../../exercises/routing-protocols.rst:1068
	English 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 ?
	French 0/1610 · 161 Needs editing
78 ../../exercises/routing-protocols.rst:1098
	English 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 ?
	French 0/1610 · 161 Needs editing
79 ../../exercises/routing-protocols.rst:1128
	English 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 ?
	French 0/1610 · 161 Needs editing
80 ../../exercises/routing-protocols.rst:1158
	English 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 ?
	French 0/1610 · 161 Needs editing
81 ../../exercises/routing-protocols.rst:1190
	English 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`.
	French 0/1730 · 173 Needs editing
82 ../../exercises/routing-protocols.rst:1228
	English What is the Loc-RIB of ``AS6`` for prefix `p9` ? Indicate which is the best route towards this prefix.
	French 0/1020 · 102 Needs editing

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