OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:2c:d7:9a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan21): addr:66:fd:03:f1:d0:fe
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:ca:c6:36:31:81:83
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:ee:ff:20:fb:c6:47
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:2c:d7:9a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
