OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:fa:1d:78:58:95:a9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:9f:5c:31
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:ce:e0:0d:74:cc:51
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:f2:3d:5b:75:45:88
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:9f:5c:31
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
