NVRAM stores a copy of the router's configuration file. The NVRAM storage area is retained by the router in the event of a power cycle. When the router powers up from a power cycle or a reboot (reload command), the Cisco IOS software copies the stored configuration file from the NVRAM to RAM. To view the configuration file stored in NVRAM, issue the show startup-config command. In earlier versions of Cisco IOS software (before version 10.3), the show config command was used to view the configuration file stored in NVRAM. In Cisco IOS versions 11.0 and above, both the show config and show startup-config commands will work. The crypto keys are also stored in NVRAM.
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