OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:a4:e0:ed
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:92:80:ce:e2:e4:73
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:06:39:14:d5:4a:67
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:26:c8:f1:34:98:44
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:a4:e0:ed
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
