OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:c4:71:f0
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:b2:3d:db:2b:45:c5
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:1a:9f:b1:11:9b:8a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:b2:8f:6c:0f:03:71
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:c4:71:f0
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
