OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:82:57:af:29:73:ab
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(eth0): addr:fa:16:3e:db:41:11
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:62:78:5b:b6:72:1b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:ce:40:af:d0:b6:69
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:db:41:11
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
