OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:1f:bc:91
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan21): addr:3a:6c:85:3e:b3:9b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:3a:82:80:21:1a:f7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:9e:7e:48:1e:03:31
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:1f:bc:91
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
