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Cisco 3600 Series Routers Hardware Installation Guide
OL-2056-05
Appendix B Using the ROM Monitor
ROM Monitor Commands
As long as the configuration register value remains 0x0, you must manually boot the operating
system from the console. Refer to the boot command in the “ROM Monitor Command Descriptions”
section on page B-4.
The two methods of entering the ROM monitor mode are as follows:
Enter ROM Monitor Mode by Using the reload Command
Connect to the router from a console, and follow these steps:
Step 1 Restart the router with the reload command.
Router# reload
Step 2 Press the Break key during the first 60 seconds of the system booting.
This forces the router into ROM monitor mode, and the ROM monitor prompt is displayed:
rommon 1>
Enter ROM Monitor Mode by Resetting the Configuration Register
Connect to the router from a console, and follow these steps:
Step 1 Set the bits 3, 2, 1, and 0 of the configuration register to zero.
Router# configuration-register 0x0
Step 2 Restart the router with the reload command.
Step 3 Router# reload
The router boots into the ROM monitor mode, and the ROM monitor prompt is displayed:
rommon 1>
Note The number that appears in the ROM monitor prompt (1>, 2>, and so forth) is the line number. It
increments each time you enter a ROM monitor command.
ROM Monitor Commands
Showing ROM Monitor Commands
Enter ? or help at the ROM monitor prompt to see a list of available commands. For example:
rommon 1> ?
alias set and display aliases command
boot boot up an external process
break set/show/clear the breakpoint
confreg configuration register utility
cont continue executing a downloaded image
context display the context of a loaded image
cookie display contents of cookie PROM in hex