Activer serveur TFTP

sudo launchctl load -w /System/Library/LaunchDaemons/tftp.plist

Sur le routeur

en
  configure terminal
    interface f0/0
      ip address 10.0.0.1
      no shut
      exit
    exit
  copy tftp flash
    <ip>
    <file>
    <file>
    [confirm erase]