OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:79:9a:e9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:22:c4:a6:5c:29:44
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:de:31:07:fe:1a:53
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:02:ff:eb:26:34:e6
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:79:9a:e9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
