Clear switch configuration Solved

Question

Hello,

To erase the configuration of a switch, I use these commands:

erase nvram:
delete flash:vlan.dat
delete flash:config.text
reload

However, I see many people using the same thing but without the command

delete flash:config.text

Why is that? Does the command "erase nvram:" include the command "delete flash:config.text"?

Thanks for your responses,

Best regards,

DrA

PS: I use "erase nvram:" because I read that it is more recommended compared to "erase startup-config," which would be an "old method."

brupala · Answer

Hello,
it somewhat depends on which equipment you are talking about, but NVRAM and flash are two physically different things.
Delete flash: ..... does not erase NVRAM.
On today's removable flashes, you can change the flash card without affecting the NVRAM.
To copy NVRAM to flash, we use copy nvram:file flash:file
and vice versa.

DoctorAngry · Answer

ru is Cisco's abbreviation for running-config And st is Cisco's abbreviation for startup-config

DoctorAngry · Answer

I have my answer! In fact, it was enough to check the manufacturer's page (as is often the case) to get the answer. Simply put, due to laziness, we rarely do it...

Here's a little summary:

The command erase nvram: indeed restores factory settings by overwriting the current configuration. NEVERTHELESS, "this command does not erase the boot variables, such as the config-register and boot system settings," it also excludes "VLAN information." That’s why, following this command, we commonly use delete flash:vlan.dat. The case of the command delete flash:config.text is a bit more particular; indeed, it is useful "to restore the default factory settings of 6500/6000 switches running Cisco IOS in redundant mode," otherwise, we can do without it in principle. And in all cases, we end with a reload.

Source: https://www.cisco.com/c/fr_ca/obsolete/switches/cisco-catalyst-2955-series-switches.html

So

erase nvram:
delete flash:vlan.dat
delete flash:config.text
reload

is correct, but if we are not on a 6500/6000 switch running IOS, we can do without it.

Thanks to brupala for the help.

Have a nice weekend!

Best regards

DrA

Clear switch configuration

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