OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:d0:ff:b4
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:d6:1d:6c:89:62:9b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:da:4f:58:c6:68:64
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:ba:54:98:2a:4d:d7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:d0:ff:b4
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
