OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:36:c0:60:16:e0:25
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan21): addr:b6:d8:55:9e:01:49
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:5e:a0:53:eb:f3:38
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(eth1): addr:fa:16:3e:da:6e:71
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:da:6e:71
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
