OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:85:11:31
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:de:d5:85:e0:b1:46
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:5a:e6:2e:2c:0b:af
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:b6:7e:0b:42:14:0f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:85:11:31
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
