{
    "external-network-mac": [
        {
          "node-id":"openflow:3",
          "port-id":"openflow:3:4",
          "mac-address":"00:00:00:00:00:02"
        },
        {
          "node-id":"openflow:4",
          "port-id":"openflow:4:2",
          "mac-address":"00:00:00:00:00:03"
        },
        {
          "node-id":"openflow:1",
          "port-id":"openflow:1:1",
          "mac-address":"00:00:00:00:00:01"
        },
        {
          "node-id":"openflow:1",
          "port-id":"openflow:1:2",
          "mac-address":"00:00:00:01:01:01"
        }
    ]
}