static struct option long_options[] = {
{"interfaces", required_argument, 0, 'i'},
{"datapath-id", required_argument, 0, 'd'},
+ {"listen", required_argument, 0, 'l'},
{"verbose", optional_argument, 0, 'v'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},