OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:1e:c5:81:23:2c:33
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:96:00:31:dc:01:d2
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:26:df:75:ea:f7:9a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(eth1): addr:fa:16:3e:29:93:ec
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:fa:16:3e:29:93:ec
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
