OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:c6:19:ce:e1:dd:65
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:ec:cd:d7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:b6:90:d5:a8:66:05
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:02:68:1d:5b:a9:33
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:ec:cd:d7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
