OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:d7:04:a8
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:02:14:d0:95:30:07
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:62:9a:4e:67:0f:b7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:12:41:ab:23:c9:0b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:d7:04:a8
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
