OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:e6:b8:df:75:50:dc
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:65:24:29
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:42:e7:5d:f6:8f:7b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:32:75:88:cf:07:ae
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:65:24:29
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
