OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:8d:1c:51
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan21): addr:82:40:c4:fc:e1:1d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:4e:75:43:c6:02:bd
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan22): addr:a6:48:36:1f:b8:9b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:8d:1c:51
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
