lldpd should already be running. You can check if
      it discovered any neighbor by using lldpctl
      command-line tool.
    
For more information, have a look at the following manual pages:
lldpd(8)lldpcli(8)
      If you want to modify the way lldpd is invoked, you
      have to
      modify /Library/LaunchDaemons/im.bernat.lldpd.plist.