{
    "hosts": {
        "h1": {"ip": "10.0.1.1/24", "mac": "08:00:00:00:01:01"},
        "h2": {"ip": "10.0.1.2/24", "mac": "08:00:00:00:01:02"}
    },
    "switches": {
        "s1": { "runtime_json" : "s1-runtime.json" }
    },
    "links": [
        ["h1", "s1-p1"], ["h2", "s1-p2"]
    ]
}