
Maintaining the Cisco 2524 and Cisco 2525 Routers A-19
Virtual Configuration Register Settings
Step 20 Press Return to confirm. When the router reboots it will use the new configuration
register value you set in Step 16.
Step 21 Log in to the router with the new or recovered passwords.
Virtual Configuration Register Settings
The router has a 16-bit virtual configuration register, which is written into NVRAM. You
might want to change the virtual configuration register settings for the following reasons:
• Set and display the configuration register value
• Force the system into the ROM monitor or boot ROM
• Select a boot source and default boot filename
• Enable or disable the Break function
• Control broadcast addresses
• Set the console terminal baud rate
• Recover a lost password (ignore the configuration file in NVRAM)
• Enable Trivial File Transfer Protocol (TFTP) server boot
Table A-2 lists the meaning of each of the virtual configuration memory bits, and defines
the boot field names.
Caution To avoid confusion and possibly halting the router, remember that valid
configuration register settings might be combinations of settings and not just the individual
settings listed in Table A-2. For example, the factory default value of 0x2102 is a
combination of settings.
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