protocol = open_vconn(argv[1], &vconn);
protocol = set_protocol_for_flow_dump(vconn, protocol, usable_protocols);
request = ofputil_encode_flow_stats_request(&fsr, protocol);
protocol = open_vconn(argv[1], &vconn);
protocol = set_protocol_for_flow_dump(vconn, protocol, usable_protocols);
request = ofputil_encode_flow_stats_request(&fsr, protocol);