{
    "type" : "node",
    "name" : "l2tpv2data",
    "layout" : [
        {
            "name" : "t",
            "size" : "1",
            "default" : "0",
            "readonly" : "true"
        },
        {
            "name" : "l",
            "size" : "1"
        },
        {
            "name" : "reserved",
            "size" : "2"
        },
        {
            "name" : "s",
            "size" : "1"
        },
        {
            "name" : "reserved",
            "size" : "1"
        },
        {
            "name" : "o",
            "size" : "1"
        },
        {
            "name" : "p",
            "size" : "1"
        },
        {
            "name" : "reserved",
            "size" : "4"
        },
        {
            "name" : "version",
            "size" : "4",
            "default" : "2",
            "readonly" : "true"
        },
        {
            "name" : "length",
            "size" : "16",
            "optional" : "l=1"
        },
        {
            "name" : "tunnelid",
            "size" : "16"
        },
        {
            "name" : "sessionid",
            "size" : "16"
        },
        {
            "name" : "ns",
            "size" : "16",
            "optional" : "s=1"
        },
        {
            "name" : "nr",
            "size" : "16",
            "optional" : "s=1"
        },
        {
            "name" : "offsetsize",
            "size" : "16",
            "optional" : "o=1"
        },
        {
            "name" : "offsetpad",
            "size" : "offsetsize<<3",
            "optional" : "o=1"
        }
    ]
}