OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:f4:5b:5d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan22): addr:02:c7:36:58:be:e7
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:3a:76:e9:4a:46:d0
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:0a:0a:66:86:c9:9a
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:f4:5b:5d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
