OFPST_PORT_DESC reply (xid=0x2):
 1(eth1): addr:fa:16:3e:d3:f8:e7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:a6:d0:3b:a7:f5:f0
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:52:c2:41:d1:c7:6d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:a6:5d:d5:fe:a1:12
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:d3:f8:e7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
