OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:1a:da:a8:30:df:45
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:63:b1:ff
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:22:5b:08:cc:2e:6c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:4a:dc:23:08:c5:54
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:63:b1:ff
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
