OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:86:f1:0c:3e:31:1d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:75:a4:56
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:8a:f2:26:b1:78:82
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:42:1e:6a:dc:ff:bb
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:75:a4:56
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
