OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:c4:6e:04
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:ba:5f:ac:3d:d2:a6
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:8e:9b:67:2e:a1:9b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:3a:e8:0c:f6:b5:2c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:c4:6e:04
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
