OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:67:12:61
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:96:e9:46:4e:14:cc
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:46:9f:05:f9:9e:26
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:36:9d:14:0e:13:a6
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:67:12:61
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
