[root@kunpeng82 Ryu-SDN-IP]# ovs-vsctl set Bridge s4 protocols=OpenFlow13 [root@kunpeng82 Ryu-SDN-IP]# ovs-ofctl dump-flows s4 2020-07-12T10:14:09Z|00001|vconn|WARN|unix:/var/run/openvswitch/s4.mgmt: version negotiation failed (we support version 0x01, peer supports version 0x04) ovs-ofctl: s4: failed to connect to socket (Broken pipe) [root@kunpeng82 Ryu-SDN-IP]# ovs-ofctl dump-flows s4 --protocols=OpenFlow13 cookie=0x0, duration=342.720s, table=0, n_packets=966, n_bytes=57960, priority=65535,dl_dst=01:80:c2:00:00:0e,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=342.735s, table=0, n_packets=42, n_bytes=3126, priority=0 actions=CONTROLLER:65535 [root@kunpeng82 Ryu-SDN-IP]#