OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:ba:40:e1:7e:46:82
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(eth0): addr:fa:16:3e:3d:75:07
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:e6:56:4d:0d:1e:f1
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:d6:4b:86:26:9c:22
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:3d:75:07
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
