OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:32:bd:4f:e1:c5:ad
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:d1:9c:a7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:9a:04:9e:9c:8a:57
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:1a:73:c4:29:54:7b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:d1:9c:a7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
