OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:34:37:e0
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:52:41:94:e1:8f:cb
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:32:af:bf:05:27:d4
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:a2:af:16:4b:40:9c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:34:37:e0
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
