message VRouterPort (XOSBase){
     optional string name = 1 [help_text = "port friendly name", max_length = 20, null = True, db_index = False, blank = True];
     required string openflow_id = 2 [help_text = "port identifier in ONOS", max_length = 21, null = False, db_index = False, blank = False];
     required manytoone vrouter_device->VRouterDevice:ports = 3 [db_index = True, null = False, blank = False];
     required manytoone vrouter_service->VRouterService:device_ports = 4 [db_index = True, null = False, blank = False];
}