OFPST_PORT_DESC reply (xid=0x2):
 1(enp4s0): addr:fa:16:3e:2b:7f:73
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:9a:02:69:63:27:be
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:a6:ce:d6:f5:da:3e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:82:71:90:63:81:25
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:2b:7f:73
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
