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Now a erase startup config erases the startup config on the switch or router.

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So on my router show startup-config

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shows output, so I can see that I’m using so many bytes out of so many bytes.

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So there’s my startup config

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erase startup config

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I'm told that erasing the nvram filesystem

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will remove all configuration files.

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I’m gonna hit enter to continue.

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We can see in the output that nvram has been erased

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and we can see that there's been the initialization of the geometry of nvram.

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So now sh start shows that startup config is not present.

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wr is a shorthand command for write memory

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so could’ve type right memory, which is an older command

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that once again is easier to use and quicker than typing copy running config

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startup config and confirming the save of current config to NVRAM.

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So now if I type sh start my config is there

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once again erase startup config erases the configuration

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so sh start shows me that the config is not present.

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If I reloaded the router at this point

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it would boot up with no configuration

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as the startup config has been erased.

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Running config is stored in RAM which is lost when the router is rebooted

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so it’s good practice to save your configuration on regular bases.