OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:9a:2c:25:37:a0:43
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:b2:93:bf:a0:ad:1b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan20): addr:c2:1f:97:0f:1a:00
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(enp1s0): addr:52:54:00:3f:a5:3a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:3f:a5:3a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
