OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:02:0a:1c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan21): addr:1e:68:5d:6d:f9:92
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:06:3e:69:42:2b:ca
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:52:72:b8:3e:90:be
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:02:0a:1c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
