This might mean writing out the negative forms of existing commands and inserting it at the beginning of your config but will require either typing the commands or copy and pasting the commands. The answer is that if your only way to connect to the ASA is via the console cable and you have a premade configuration you want to have on the ASA then you must make the configuration changes manually. As a result any answer cannot require the use of ASDM (HTTP/HTTPS), TFTP, SSH, or Telnet. There is no possibility of temporarily configuring an ethernet port on the ASA to provide IP communications. Updated Answer to Address Updated Question So, is there a way to be able to reliably overwrite the config on an ASA rather than merging it with the current config using only console access, or can it only be done via TFTP/ASDM/etc? I don't necessarily need to replace the running config replacing the startup config and reloading would be preferable really. If there's a way to do a straight overwrite/replace, it would be useful for the future. but that's error prone and time consuming. Remove any elements that are remnants from the base config.Compare the resultant running config against my pre-written one.Paste in chunks and address errors as they arise.I appreciate that I could do the following: I can run a configure factory-default first to put the ASA back to a simple factory default configuration, but even then there's enough in the running config to mean the resultant merged config isn't quite right. The difficulty with this is that it merges the pasted config with the current running config, as opposed to replacing it, leaving some remnants of the original config, and sometimes causing odd errors. Various sources suggest pasting the config into the terminal when in Global Configuration mode. I'd like to be able to apply a pre-written config to a Cisco ASA 5505, but presently I only have access to it via the serial console and not over the network.
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