OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:12:75:15:dd:7d:1b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:45:85:e4
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:b2:37:0d:16:37:18
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:a6:2c:ab:99:e9:7d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:45:85:e4
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
