OFPST_PORT_DESC reply (xid=0x2):
 1(vlan22): addr:e2:0a:e1:75:8d:ad
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(eth1): addr:fa:16:3e:ad:a5:39
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:fa:93:bb:41:7d:49
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:7e:ee:cc:95:6b:56
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:ad:a5:39
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
