OFPST_PORT_DESC reply (xid=0x2):
 1(vlan20): addr:b6:0a:94:dc:6f:63
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:66:20:b5
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:16:d4:6f:43:96:8b
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan21): addr:76:20:ab:f1:b1:ff
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:66:20:b5
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
