nova/doc/api_samples/os-virtual-interfaces/v2.12/vifs-list-resp.json

{
    "virtual_interfaces": [
        {
            "id": "cec8b9bb-5d22-4104-b3c8-4c35db3210a6",
            "mac_address": "fa:16:3e:3c:ce:6f",
            "net_id": "cec8b9bb-5d22-4104-b3c8-4c35db3210a7"
        }
    ]
}