{
    "type" : "node",
    "name" : "ah",
    "layout" : [
        {
            "name" : "nextheader",
            "size" : "8"
        },
        {
            "name" : "payloadlength",
            "size" : "8"
        },
        {
            "name" : "reserved",
            "size" : "16"
        },
        {
            "name" : "spi",
            "size" : "32"
        },
        {
            "name" : "sequencenumber",
            "size" : "32"
        }
    ]
}