OFPST_PORT_DESC reply (xid=0x2):
 1(enp1s0): addr:52:54:00:02:26:53
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 2(vlan20): addr:2e:d5:50:bc:85:dc
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 3(vlan21): addr:f6:48:53:7a:a1:3c
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(vlan22): addr:3a:11:fd:eb:37:e6
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:52:54:00:02:26:53
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
