{
    "type" : "node",
    "name" : "mac",
    "layout" : [
        {
            "name" : "src",
            "size" : "48",
            "format" : "mac",
            "default" : "00:00:00:00:00:01"
        },
        {
            "name" : "dst",
            "size" : "48",
            "format" : "mac",
            "default" : "00:00:00:00:00:02"
        },
        {
            "name" : "ethertype",
            "size" : "16"
        }
    ]
}