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.. include:: replace.txt |
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Topology Input Readers |
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The topology modules aim at reading a topology file generated by an automatic topology generator. |
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The process is divided in two steps: |
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- running a topology generator to build a topology file |
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- reading the topology file and build a ns-3 simulation |
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Hence, model is focused on being able to read correctly the various topology formats. |
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Currently there are three models: |
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* ``ns3::OrbisTopologyReader`` for Orbis_ 0.7 traces |
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* ``ns3::InetTopologyReader`` for Inet_ 3.0 traces |
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* ``ns3::RocketfuelTopologyReader`` for Rocketfuel_ traces |
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An helper ``ns3::TopologyReaderHelper`` is provided to assist on trivial tasks. |
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A good source for topology data is also Archipelago_. |
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The current Archipelago Measurements_, monthly updated, are stored in the CAIDA website using |
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a complete notation and triple data source, one for each working group. |
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A different and more compact notation reporting only the AS-relationships (a sort of more |
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Orbis-like format) is here: as-relationships_. |
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The compact notation can be easily stripped down to a pure Orbis format, just removing |
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the double relationships (the compact format use one-way links, while Orbis use two-way |
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links) and pruning the 3rd parameter. Note that with the compact data Orbis can then be |
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used create a rescaled version of the topology, thus being the most effective way |
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(to my best knowledge) to make an internet-like topology. |
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Examples can be found in the directory ``src/topology-read/examples/`` |
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.. _Orbis: http://sysnet.ucsd.edu/~pmahadevan/topo_research/topo.html |
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.. _Inet: http://topology.eecs.umich.edu/inet/ |
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.. _RocketFuel: http://www.cs.washington.edu/research/networking/rocketfuel/ |
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.. _Archipelago: http://www.caida.org/projects/ark/ |
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.. _Measurements: http://data.caida.org/datasets/topology/ipv4.allpref24-aslinks/ |
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.. _as-relationships: http://www.caida.org/data/active/as-relationships/index.xml |
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