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4-24 Cisco 12012 Gigabit Switch Router Installation and Configuration Guide
Implementing Other Configuration Tasks
Configuring the Software Configuration Register
The Cisco 12012 system uses a 16-bit software configuration register, which allows you to
set specific system parameters. Settings for the software configuration register are written
into NVRAM.
Following are some reasons for changing the software configuration register settings:
•
To select a boot source and default boot filename.
•
To enable or disable the Break function.
•
To control broadcast addresses.
•
To set the console terminal baud rate.
•
To load operating software from Flash memory.
•
To enable booting from a Trivial File Transfer Protocol (TFTP) server.
•
To recover a lost password.
•
To allow you to manually boot the system using the b command at the bootstrap
program prompt.
•
To force an automatic boot from the system bootstrap software (boot image) or from a
default system image in onboard Flash memory, and read any boot system commands
that are stored in the configuration file in NVRAM.
Table 4-3 lists the meaning of each of the software configuration memory bits, and
Table 4-4 defines the boot field, which consists of bits 0 through 3 of the software
configuration register and is specified as a binary number.
Caution
To avoid confusion and possibly halting the Cisco 12012, remember that valid
configuration register settings might be combinations of settings and not just the individual
settings listed in Table 4-3. For example, the factory default value of 0x0102 is a
combination of settings.
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