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C-1
Cisco 3600 Series Routers Hardware Installation Guide
OL-2056-05
APPENDIX
C
Configuration Register
This appendix describes the factory default settings of the configuration register, and procedures for
changing those settings.
This appendix has the following sections:
• Configuration Register Settings, page C-1
• Changing Configuration Register Settings, page C-2
• Configuring the Boot Field, page C-4
• Enabling Booting from Flash Memory, page C-6
Configuration Register Settings
The router has a 16-bit configuration register in NVRAM. You can use the configuration register to
perform the following tasks:
• Set and display the configuration register value
• Force the router into the ROM monitor (bootstrap program)
• Select a boot source and default boot filename
• Enable or disable the Break function
• Control broadcast addresses
• Load operating software from ROM
Table C-1 describes each configuration register bit.