Ergo:Įach bit (sometimes a group of bits) corresponds to a particular flag. But the pattern is carried on exactly the same. 0x0 vs 0x0000), there are four binary digits. This is rather convenient for human-readable interpretations of binary numbers:įor each digit in the hex number (e.g. The 0x prefix indicates the number is hexadecimal. If you convert the number to binary, you will see a series of "switches" that are either enabled or disabled. The configuration register (confreg) is a bitmap. It's a bootstrap image in ROM that contains just enough intelligence to boot the main OS, or modify the pre-boot environment as necessary for troubleshooting (for e.g.) You could argue whether it qualifies as an operating system at all.
(The boot message says "Adaptive Security Appliance Software" so I guess that's "ASAS"? Hmm.) This may seem trivial and perhaps obvious, but it's essential to understand they come from different pedigree, and assumptions valid for one platform don't necessarily carry over to the other.
Here goes.Ī Cisco ASA is not the same thing as a Cisco router - they're different animals with different OSes, and similar but significantly different syntax and philosophy. There are some misleading assumptions here, so I'm going to clarify for future Googlers. This is an old post, but it came up in the first page of search results while looking up the ASA confreg bitmap. Thanks for those who are willing to take the time to assist. So I just want to make sure my device is booting the right way and I guess not understanding how these feature works is really bothering me. I then did a factory-default just to load something simple to NVRAM, saved it and did a reload and the configurations where still there. I then did the "boot system flash:asamodel.bin" then changed the config-register to 0x1 as it was set to a 0x20xx, I don't remember what it was set to exactly but then I saved it, did a reload and it booted with the IOS image. So to get to where I am now, I copied the IOS to flash thru a TFTP server on my laptop and saved it to NVRAM "wr mem". Am I not understanding it right or do these codes apply differently with other models? If I set it to 0x1 it loads like normal, or at least to the factory default that I created and is currently in flash. I've read that 0x2102 is default and is what it should be set at but when I set it to this and do a reload it takes me back into rommon mode again. So I had an employee accidently erase flash on a Cisco ASA 5505 and it kept booting to rommon mode because it lost the IOS and had a question regarding the config-register code after re-loading the IOS thru TFTP and saving it to flash.
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