OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:97:7c:2f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:e2:d2:7b:ae:b8:60
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:72:f2:ee:e4:5b:a7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:96:e0:ff:66:6c:ca
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:97:7c:2f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
