OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:12:2c:e2:89:31:3c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:10:be:b2
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:2a:00:6e:ba:01:9e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:da:f3:a2:e9:16:f1
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:10:be:b2
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
