os-net-config/etc/os-net-config/samples/bond.json

{ "network_config": [
        {
            "type": "ovs_bridge",
            "name": "br-ctlplane",
            "use_dhcp": "true",
            "members": [
                {
                    "type": "ovs_bond",
                    "name": "bond1",
                    "use_dhcp": "true",
                    "members": [
                        { "type": "interface", "name": "em1" },
                        { "type": "interface", "name": "em2" }
                    ]
                }
            ]
        }
    ]
}