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Cisco 3660 error message: NVRAM area bad

I have a Cisco 3660 and sometimes it just hangs and I cannot access it through telnet and when connecting through console it is in the Rommon> mode. I modify the conf register with "config" command and reset it. Sometimes it works and sometimes it doesn't. The error messages are "NVRAM area bad."

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When you are able to get into privileged mode, copy the config to a file to save it. Then do a "write erase" on the console. This erases the NVRAM. I would then reboot the router and copy the config file back into it. Make sure to end with a "write mem". This might be a solution for your problem; I do believe that your NVRAM will eventually die. Sometimes clearing and rewriting NVRAM solves these kinds of problems. If not, then I think you might want the swap the router.

This was first published in July 2002

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