OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:fe:ad:b3:38:de:b2
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:e3:c9:41
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:2e:c4:32:92:72:0e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:76:55:93:04:5d:13
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:e3:c9:41
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
