OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:7e:12:57:a4:2b:3a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:4e:51:9f:d6:ec:82
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:36:86:1b:d5:af:20
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(eth1): addr:fa:16:3e:a9:f9:1f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:a9:f9:1f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
