OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:ca:86:7f:e1:b1:b0
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:a8:78:db
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:ca:b7:fd:96:65:be
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:da:7a:2f:05:f0:12
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:a8:78:db
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
