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# Datacenter

    """
    Datacenter topology
    ===================

    This example shows how to generate a datacenter topology, assign capacities
    and save everything to an XML file
    """
    import fnss
    import networkx as nx

    # create a topology with 10 core switches, 20 edge switches and 10 hosts
    # per switch (i.e. 200 hosts in total)
    topology = fnss.two_tier_topology(n_core=10, n_edge=20, n_hosts=10)

    # assign capacities
    # let's set links connecting servers to edge switches to 1 Gbps
    # and links connecting core and edge switches to 10 Gbps.

    # get list of core_edge links and edge_leaf links
    link_types = nx.get_edge_attributes(topology, 'type')
    core_edge_links = [link for link in link_types
                       if link_types[link] == 'core_edge']
    edge_leaf_links = [link for link in link_types
                       if link_types[link] == 'edge_leaf']

    # assign capacities
    fnss.set_capacities_constant(topology, 1, 'Gbps', edge_leaf_links)
    fnss.set_capacities_constant(topology, 10, 'Gbps', core_edge_links)

    # assign weight 1 to all links
    fnss.set_weights_constant(topology, 1)

    # assign delay of 10 nanoseconds to each link
    fnss.set_delays_constant(topology, 10, 'ns')

    # save topology to a file
    fnss.write_topology(topology, 'datacenter_topology.xml')

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