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Tuesday, January 12, 2010

Warning: monitor nvram area is corrupt

We got the error message as below while loading the 3660 router. Warning: monitor nvram area is corrupt ... using default values. ERROR in NVRAM sizing. NVRAM could be bad! What could be the cause of this problem?

  1. The router is probably experiencing a hardware problem. The problem also encompasses the FLASH memory, as the router is not able to access it and load the IOS stored there.
  2. Enter the ROMMON mode and try to download the IOS file back to the FLASH using the tftpdnld command. The following URL contains a discussion how to use this command. It is written for 2600 series routers but will work the same way for 3660.
  3. If you manage to load and boot the IOS, try to issue the commands erase startup-config and copy running-config startup-config to reinitialize the NVRAM and to store data there.
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