OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:5e:12:ab:2e:3b:b9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:38:eb:ac
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:9e:0d:a8:71:4d:ac
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:ca:b1:d3:b5:7a:7f
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:38:eb:ac
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
