OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:3a:6e:be:85:3b:3b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:86:52:d8:f4:c9:0c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(enp1s0): addr:52:54:00:77:f0:41
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan22): addr:4a:7b:bf:ad:7c:18
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:77:f0:41
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
