OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:29:36:7e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:fe:64:02:7c:df:e2
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:e6:ca:31:bb:67:ce
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:ae:31:49:ce:07:8e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:29:36:7e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
