OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:66:61:e0:48:70:0a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:73:ec:ed
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:d6:66:77:d9:b9:cf
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:7e:ba:af:03:b5:12
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:73:ec:ed
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
