OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:41:8e:0b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:16:38:3a:04:dd:2e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:2a:46:a8:a3:bb:c8
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:46:34:79:fd:89:fc
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:41:8e:0b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
