Change The Configuration Register - Cisco CISCO851-K9 - 851 Integrated Services Router Configuration Manual

Recovering a Lost Password

Change the Configuration Register

To change a configuration register, follow these steps:
Connect an ASCII terminal or a PC running a terminal emulation program to the CONSOLE port on the
Step 1
rear panel of the router.
Configure the terminal to operate at 9600 baud, 8 data bits, no parity, and 1 stop bit.
Step 2
If you still have access to the router, enter the show version command at the privilege EXEC prompt to
Step 3
display the existing configuration register value (shown in bold at the bottom of this output example).
Record the setting of the configuration register.
Router# show version
Cisco IOS Software, C870 Software (C870-ADVENTERPRISEK9-M), Version 12.3(nightly
.PCBU_WIRELESS041110) NIGHTLY BUILD, synced to haw_t_pi1_pcbu HAW_T_PI1_PCBU_200
40924
Copyright (c) 1986-2004 by Cisco Systems, Inc.
Compiled Thu 11-Nov-04 03:37 by jsomebody
ROM: System Bootstrap, Version 1.0.0.6(20030916:100755) [jsomebody],
DEVELOPMENT SOFTWARE
Router uptime is 2467 minutes
System returned to ROM by power-on
System image file is "flash:c870-adventerprisek9-mz.pcbu_wireless.041110"
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Cisco 877 (MPC8272) processor (revision 0x00) with 59392K/6144K bytes of memory.
Processor board ID
MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10
4 FastEthernet interfaces
1 ATM interface
1 802.11 Radio
128K bytes of non-volatile configuration memory.
20480K bytes of processor board System flash (Intel Strataflash)
Configuration register is 0x2102
If you do not have access to the router (because of a lost login or tacacs password), you can safely
Step 4
consider that your configuration register is set to 0x2102.
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
14-10
Chapter 14 Troubleshooting
OL-5332-01