User Guide

Chapter 2 Basic MSFC Software Configuration
Performing Other Configuration Tasks
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Cisco 7600 Optical Services Router Quick Software Configuration Guide
78-12799-01
Configuring the Software Configuration Register
The software configuration register is a 16-bit register in NVRAM that you use to
define specific system parameters.You can set or change the contents of this
register to accomplish these tasks:
• Define boot sources for the default Cisco IOS software, assigning them in the
following order of precedence:
– Flash memory card inserted in PCMCIA slot 0
– TFTP server in the network
– Flash memory SIMM (NVRAM) on the GRP
– Boot image stored within the operating environment, which you access
by means of an appropriate form of the boot command issued at the ROM
monitor prompt (rommon>)
• Define a default boot filename.
• Enable or disable the Break function.
• Control broadcast addresses.
• Set the console terminal baud rate.
• Recover a lost password.
• Force an automatic boot using a boot image.
• Read boot system commands from the configuration file stored in NVRAM.
The factory default value for the software configuration register is 0x0102.
This value is a combination of the following: binary bit 8 = 0x0100 and binary
bits 00 through 03 = 0x0002.
Caution To avoid confusion, note that valid software configuration register values may
be combinations of settings. For example, the factory default value 0x0102 for
the software configuration register is actually a composite of settings in this
register.