OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:53:3b:61
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:8a:ec:eb:4d:5d:6b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:be:07:84:02:bd:2b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:be:8d:64:e1:9c:4b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:53:3b:61
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
