OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:a3:d1:ec
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:4a:d7:b2:15:45:b4
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:4a:b5:e8:a2:b2:3f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:0a:23:e2:46:a8:3d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:a3:d1:ec
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
