Power Failure and a Drained Battery

What information will be lost if there is a power failure and the battery is drained?

The Catalyst configuration settings are saved in NVRAM (non-volatile RAM), so your configuration information is not at risk. When the Catalyst senses that it does not have enough power to continue to operate properly, it will execute a routine that will save the following information to NVRAM:

  • Arm/Disarm State
  • TOD clock
  • Diagnostic Statistics and Counts
  • Channel Values
  • Channel State
  • Last Scan Error
  • Time of Last Scan Error