OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:b4:a2:24
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:8e:12:a2:fd:66:63
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:f6:92:06:84:99:3e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan22): addr:8a:de:31:4c:33:59
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:b4:a2:24
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
