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How to upgrade the NVRAM size on a Cisco Catalyst 4000/4500 and 6000/6500 switch running CatOS software when the NVRAM shows that low memory is available
The NVRAM cannot be increased and is not upgradeable. This insufficient NVRAM issue is normal in switches with large configuration files.
The workaround is to save the configuration file as a text file. To do this, issue the set config mode text command, where there is the option to save the configuration either in bootflash: or in slot0: (PCMCIA Flash card).
Note: When the configuration mode is set to text-configuration, the configuration is not automatically saved, as in binary mode. A write memory command must be issued in order to save the configuration every time a change is made. However, there is an auto-save feature in text-configuration mode.