OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:5e:a5:c3:1a:4e:a2
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:70:4a:b8
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:62:80:97:c8:70:27
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:46:00:65:2a:b8:b4
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:70:4a:b8
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
