quote:
Originally posted by mkoenig:
What are the configuration register settings. for example: What is config register 1x1010?
First a few words on notation. It should start with 0x, not 1x. 0x is a common notation to tell that the number that follows is written in hexadecimal, each digit taking a value from 0 to F representing four bits (sometimes called a nibble). A common value for the config register is 0x2102. I will use that in my examples below.
An appendix in ICND has a table. I guess a little search on the Cisco site will reveal them too. AFAIK there may be differences between router models. Here are some of the more important ones (the ones I remember):
- The last four bits (0 in your example)
0: Boot rommon (the simple monitor built into ROM. You use it for password recovery and some more exhotic functions
1: Boot the built-in IOS in ROM. This is a rudimentary IOS, usefull for creating initial configurations and installing a full-funcion IOS if you have lost the original one.
2-F: Load IOS from flash (or whatever the config says). All values from 2 to F are equal except for the default file name if loading from the network
- The next to the last nibble (1 in your example, 0 in mine). The value I most commonly use is 4 which means that the router should ignore the config in NVRAM when booting. Usefull for password recovery.
- The third last nibble (0 in your example, 1 in mine). We normally put 1 here to tell the router to ignore break (except during the first 60 seconds of power-up)
- The first nibble (1 in your example, 2 in mine). The value 2 here is common to to tell the router to boot the built in IOS in ROM if a network boot fails. You value of 1 here would lower the speed on the console port which is rarely done.
Hope that puts you on the track to a more complete understanding of this important register.
Terje
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01-08-01 12:34 PM
