OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:2e:94:4a:7f:23:59
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:db:25:1c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:32:85:30:35:84:07
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:8e:59:31:59:bf:0e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:db:25:1c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
