OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:23:1a:af
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan21): addr:42:42:1a:fd:c9:4c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:da:06:92:f8:c9:13
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:0e:06:a1:86:8d:38
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:23:1a:af
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
