topology.json

{
    "hosts": {
        "h1": {"ip": "10.0.1.1/24", "mac": "08:00:00:00:01:01",
               "commands":["route add default gw 10.0.1.10 dev eth0",
                           "arp -i eth0 -s 10.0.1.10 08:00:00:00:01:00"]},
        "h2": {"ip": "10.0.2.2/24", "mac": "08:00:00:00:02:02",
               "commands":["route add default gw 10.0.2.20 dev eth0",
                           "arp -i eth0 -s 10.0.2.20 08:00:00:00:02:00"]},
        "h3": {"ip": "10.0.3.3/24", "mac": "08:00:00:00:03:03",
               "commands":["route add default gw 10.0.3.30 dev eth0",
                           "arp -i eth0 -s 10.0.3.30 08:00:00:00:03:00"]}
    },
    "switches": {
        "s1": { "runtime_json" : "s1-runtime.json" },
        "s2": { "runtime_json" : "s2-runtime.json" },
        "s3": { "runtime_json" : "s3-runtime.json" }
    },
    "links": [
        ["h1", "s1-p1"], ["s1-p2", "s2-p2"], ["s1-p3", "s3-p2"],
        ["s3-p3", "s2-p3"], ["h2", "s2-p1"], ["h3", "s3-p1"]
    ]
}