OFPST_PORT_DESC reply (xid=0x2):
 1(vlan21): addr:56:6a:92:c6:b4:2d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(enp1s0): addr:52:54:00:42:ca:6c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan22): addr:b6:90:11:ee:01:1c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan20): addr:62:e9:30:51:86:12
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:42:ca:6c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
