OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:9a:13:aa:6f:c7:ad
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:86:ae:45:ad:10:36
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:8a:6d:13:a9:e9:27
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(eth1): addr:fa:16:3e:25:bb:2b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:25:bb:2b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
