OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:52:a6:1e:73:a5:00
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan21): addr:22:af:c2:12:c8:74
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(enp1s0): addr:52:54:00:3e:73:f8
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan22): addr:42:70:bb:0f:29:6a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:3e:73:f8
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
