# add @map1 { ip saddr . ip daddr : meta mark }
[
    {
        "set": {
            "data": {
                "meta": {
                    "key": "mark"
                }
            },
            "elem": {
                "concat": [
                    {
                        "payload": {
                            "field": "saddr",
                            "protocol": "ip"
                        }
                    },
                    {
                        "payload": {
                            "field": "daddr",
                            "protocol": "ip"
                        }
                    }
                ]
            },
            "map": "@map1",
            "op": "add"
        }
    }
]

# add @map1 { ip saddr . ip daddr : meta mark }
[
    {
        "map": {
            "data": {
                "meta": {
                    "key": "mark"
                }
            },
            "elem": {
                "concat": [
                    {
                        "payload": {
                            "field": "saddr",
                            "protocol": "ip"
                        }
                    },
                    {
                        "payload": {
                            "field": "daddr",
                            "protocol": "ip"
                        }
                    }
                ]
            },
            "map": "@map1",
            "op": "add"
        }
    }
]