OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:7a:c7:78:84:f1:0f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:12:af:35:80:12:ba
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:52:ef:d0:7e:e4:66
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(eth1): addr:fa:16:3e:62:f0:ed
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:62:f0:ed
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
