Fast PoE minimizes the PoE controller recovery time in case of a power failure. With Fast PoE, the PoE controller initializes the moment the switch powers on, which results in a faster recovery period.
Perpetual PoE provides uninterrupted power to all connected devices during a switch reboot.
Important
After you enable Fast PoE or Perpetual PoE or both, you must save the running configuration file.
If Fast PoE or Perpetual PoE are enabled and you change global or port-specific PoE configuration, you must save the running configuration file.