OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:16:cd:f4:4e:90:00
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:e6:82:8e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:5a:89:89:16:65:cc
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:4a:7d:f7:1a:ae:b3
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:e6:82:8e
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
