Core Issue
The configuration register is set to ignore startup configuration.
Resolution
Issue the config-register command from global configuration mode, and set the configuration register to 0x2102.
For more information, refer to Why Does My Router Lose Its Configuration During Reboot?
If the router has a valid Cisco IOS Software image, then changing the configuration value register to 0x2102 recovers the router.
If the ROMmon prompt is ">", type the following at the ROM Monitior (ROMmon) prompt:
>o/r 0x2102
>i System Bootstrap, Version 11.0(10c)XB2, RELEASE SOFTWARE
Copyright (c) 1986-2003 by cisco Systems
2500 processor with 16384 Kbytes of main memory
F3: 10021772+224116+562960 at 0x3000060
Restricted Rights Legend
Use, duplication,............................ If the ROMmon prompt is "rommon #>", type the following at the prompt:
rommon 1> confreg 0x2102 You must reset or power cycle the router for the new configuration to take effect:
rommon 2> reset
System Bootstrap, Version 12.0(6r)T3, RELEASE SOFTWARE (fc1) Copyright (c) 1999 by cisco Systems, Inc. UBR924 platform with 16384 Kbytes of main memory.......................
If the router boots up successfully, then the cause was a configuration register value issue.
For more information, refer to these documents:
