OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:a6:3a:14:a9:2c:80
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:4d:e0:4d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:62:5b:14:b1:73:f9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:da:78:2c:76:cd:60
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:4d:e0:4d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
