OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:9a:bb:27:cf:f8:76
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:01:2e:4a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:a2:bc:3c:96:5b:0f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:d2:52:aa:32:23:93
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:01:2e:4a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
