OFPST_PORT reply (xid=0x2): 7 ports
  port 20: rx pkts=7, bytes=438, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=8, bytes=616, drop=0, errs=0, coll=0
  port  1: rx pkts=0, bytes=0, drop=?, errs=?, frame=?, over=?, crc=?
           tx pkts=0, bytes=0, drop=?, errs=?, coll=?
  port  4: rx pkts=276, bytes=30267, drop=?, errs=?, frame=?, over=?, crc=?
           tx pkts=186, bytes=19890, drop=?, errs=?, coll=?
  port 17: rx pkts=3, bytes=270, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=8, bytes=616, drop=0, errs=0, coll=0
  port LOCAL: rx pkts=0, bytes=0, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=0, bytes=0, drop=0, errs=0, coll=0
  port 19: rx pkts=32, bytes=3730, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=36, bytes=4796, drop=0, errs=0, coll=0
  port 16: rx pkts=28, bytes=3390, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=29, bytes=4401, drop=0, errs=0, coll=0
