ASA 5505 configuration file switching

[itlklubos6]

Hei,

I have difficulty to understand how the commands for setting the configuration file path are working.

I have two configuration files in the firewall, both in the disk0:/

A.cfg
B.cfg

Scenario:

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The active configuration is B (i. e. loaded from the file B.cfg and running)

Task:
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The configuration file B.cfg is obsolete/wrong, and I want to use the config file A.cfg instead.

What I have done:
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firewall(config)# boot config disk0:/A.cfg
firewall(config)# exit
firewall# show bootvar

this will show : CONFIG_FILE variable: disk0:/B.cfg
                 Current CONFIG_FILE variable: disk0:/A.cfg

According what I have read, to set the CONFIG_FILE variable I need to save the running configuration:
firewall# copy runnning-config startup-config

BUT:
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That command will overwrite the correct A.cfg with a B.cfg. And also, the "copy" actuallly performs the "merge". Than the A.cfg is loaded, but with the content overwritten by B.cfg.

Question:
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How can I switch between multiple config files without overwriting them?

Thanks for help.

[Marius Gunnerud · Accepted solution]

You would need to remove the running config completely and then copy the A.cfg into the running config.

clear configure all

copy disk0:A.cfg running-config

boot config disk0:A.cfg  <-- if it is not present in the A.cfg file.

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[itlklubos6]

Thanks for help.