OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:12:45:be
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:f2:db:22:d3:69:6e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:16:03:c9:bd:eb:7c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:5e:7a:7b:cd:2f:69
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:12:45:be
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
