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This router (`as1`) has two BGP neighbors: ``2001:cafe:1:12::2`` and ``2001:cafe:1:13::3``. Both BGP sessions are established using the current version of the protocol (version 4). About 50 messages were sent/received over each session. These messages are mainly the BGP Keepalive messages that are exchanged every 30 seconds. The last column indicates that two prefixes were received over each session. We can see more details about these two eBGP sessions with the `show bgp neighbors` command.
This router (`as1`) has two BGP neighbors: ``2001:cafe:1:12::2`` and ``2001:cafe:1:13::3``. Both BGP sessions are established using the current version of the protocol (version 4). About 50 messages were sent/received over each session. These messages are mainly the BGP Keepalive messages that are exchanged every 30 seconds. The last column indicates that two prefixes were received over each session. We can see more details about these two eBGP sessions with the `show bgp neighbors` command.
a month ago
User avatar gegoa

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A useful command to start is `show bgp summary` which provides a summary of the state of the BGP daemon.
A useful command to start is `show bgp summary` which provides a summary of the state of the BGP daemon.
a month ago
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In these exercises, we mainly consider the ``show`` that extracts information from the BGP daemon. We type `show bgp` and press the `tabulation` key to see the available commands in the `show bgp`.
In these exercises, we mainly consider the ``show`` that extracts information from the BGP daemon. We type `show bgp` and press the `tabulation` key to see the available commands in the `show bgp`.
a month ago
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The password for the BGP daemon is `zebra`. The `noecho` command indicates that mininet_ does not need to echo the characters that you type. You then enter the Quagga VTY that enables you to type commands. The `help` commands gives you some information about the available commands as well as `?`.
The password for the BGP daemon is `zebra`. The `noecho` command indicates that mininet_ does not need to echo the characters that you type. You then enter the Quagga VTY that enables you to type commands. The `help` commands gives you some information about the available commands as well as `?`.
a month ago
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Besides :manpage:`ping6(8)` and :manpage:`traceroute6(8)`, it is also useful to interact with the BGP daemon that runs on each of our routers. This is done by connecting on the Command Line Interface of the BGP router using telnet.
Besides :manpage:`ping6(8)` and :manpage:`traceroute6(8)`, it is also useful to interact with the BGP daemon that runs on each of our routers. This is done by connecting on the Command Line Interface of the BGP router using telnet.
a month ago
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The same applies for the paths between ``h1`` and ``h2``
The same applies for the paths between ``h1`` and ``h2``
a month ago
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Note that the path preferred by ``AS3`` to reach ``AS1`` is different.
Note that the path preferred by ``AS3`` to reach ``AS1`` is different.
a month ago
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We can now explore the routes in this small Internet. Host ``h1`` can reach directly host ``h3``.
We can now explore the routes in this small Internet. Host ``h1`` can reach directly host ``h3``.
a month ago
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We have configured the following addresses on the hosts.
We have configured the following addresses on the hosts.
a month ago
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We can also use :manpage:`traceroute6(8)` to check the path followed by the packets. Before doing that, think about the configuration of the BGP routing policies and try to predict the output of :manpage:`traceroute6(8)`. This is a good exercise to check your understanding of BGP.
We can also use :manpage:`traceroute6(8)` to check the path followed by the packets. Before doing that, think about the configuration of the BGP routing policies and try to predict the output of :manpage:`traceroute6(8)`. This is a good exercise to check your understanding of BGP.
a month ago
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Remember that BGP is a distributed protocol and that it takes some time to launch the daemons and exchange the messages. After some time, the same command will confirm that everything works as expected.
Remember that BGP is a distributed protocol and that it takes some time to launch the daemons and exchange the messages. After some time, the same command will confirm that everything works as expected.
a month ago
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If you launch the script and immediately type ``ping6all`` to check the connectivity, you might obtained the following result.
If you launch the script and immediately type ``ping6all`` to check the connectivity, you might obtained the following result.
a month ago
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We can now run this simple network.
We can now run this simple network.
a month ago
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The script ends by launching the full topology. The entire script is available from :download:`/exercises/ipmininet_scripts/ebgp-simple.py`.
The script ends by launching the full topology. The entire script is available from :download:`/exercises/ipmininet_scripts/ebgp-simple.py`.
a month ago
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The last step is to specify to which AS each router belongs and to configure the eBGP sessions and their routing policies. IPMininet_ abstracts most of the complexity of the configuration of these policies by supporting two policies
The last step is to specify to which AS each router belongs and to configure the eBGP sessions and their routing policies. IPMininet_ abstracts most of the complexity of the configuration of these policies by supporting two policies
a month ago
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The `addDaemon` method adds a BGP daemon on each router and configures it to advertise the IPv6 prefix allocated to this AS. We then create all the links and manually assign one IPv6 subnet to each link and one IPv6 address to each interface. For the interdomain links, we use an IPv6 prefix that belongs to one of the attached ASes.
The `addDaemon` method adds a BGP daemon on each router and configures it to advertise the IPv6 prefix allocated to this AS. We then create all the links and manually assign one IPv6 subnet to each link and one IPv6 address to each interface. For the interdomain links, we use an IPv6 prefix that belongs to one of the attached ASes.
a month ago
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``AS3`` is assigned ``2001:cafe:3::/48``
``AS3`` is assigned ``2001:cafe:3::/48``
a month ago
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``AS2`` is assigned ``2001:cafe:2::/48``
``AS2`` is assigned ``2001:cafe:2::/48``
a month ago
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``AS1`` is assigned ``2001:cafe:1::/48``
``AS1`` is assigned ``2001:cafe:1::/48``
a month ago
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As in the previous examples, we create the routers and associate one IPv6 prefix to each AS:
As in the previous examples, we create the routers and associate one IPv6 prefix to each AS:
a month ago

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