OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:ee:2a:a4:18:7a:b5
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:60:75:1b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:e6:dc:38:ad:28:95
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:6e:d8:5a:ae:9e:a9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:60:75:1b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
