OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:9d:9e:a9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:f2:28:a2:dc:bd:91
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:e2:1c:a6:3b:44:3e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:fe:88:7c:7b:cf:52
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:9d:9e:a9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
