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1.Press Break(CTRL+Break) on the terminal keyboard within 60 seconds of power up in order to put the router into ROMmon.


 

2.hostname> confreg 0x2142This step bypasses the startup configuration where the passwords are stored.


 

3.hostname> reset

The router reboots, but ignores the saved configuration.


 

4.Type no after each setup question, or press Ctrl-C in order to skip the initial setup procedure.


 

5.hostname> enable 


 

6.hostname# configure memory or copy startup-config running-config 

in order to copy the NVRAM into memory.

 

Warning: Do not type copy running-config startup-config or write. These commands erase your startup configuration.

 

 7.Type show running-config.

The show running-config command shows the configuration of the router. In this configuration, the shutdown command appears under all interfaces, which indicates all interfaces are currently shut down. In addition, the passwords (enable password, enable secret, vty, console passwords) are in either an encrypted or unencrypted format. You can reuse unencrypted passwords. You must change encrypted passwords to a new password.


 

8.hostname(config)# configure terminal


 

9.hostname(config)# enable secret 00000


 

10.Issue the no shutdown command on every interface that you use.


 

11.hostname(config)# config-register 0x2102


 

12.hostname# write memory or copy running-config startup-config

 

Configuration Register Values

The factory-default setting for the configuration register is 0x2102. This indicates that the router should attempt to load a Cisco software image from Flash memory and load the startup configuration with a console speed of 9600 baud.

Configuration Register Setting

Router Behavior

0x102
  •  
    • Ignores break
    • 9600 console baud

0x1202
  •  
    • 1200 baud rate

0x2101
  •  
    • Boots into bootstrap
    • Ignores break
    • Boots into ROM if initial boot fails
    • 9600 console baud rate

0x2102
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 9600 console baud rate default value for most platforms

0x2120
  •  
    • Boots into ROMmon
    • 19200 console speed

0x2122
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 19200 console baud rate

0x2124
  •  
    • NetBoot
    • Ignores break
    • Boots into ROM if initial boot fails
    • 19200 console speed

0x2142
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 9600 console baud rate
    • Ignores the contents of Non-Volatile RAM (NVRAM) (ignores configuration)

0x2902
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 4800 console baud rate

0x2922
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 38400 console baud rate

0x3122
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 57600 console baud rate

0x3902
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 2400 console baud rate

0x3922
  •  
    • Ignores break
    • Boots into ROM if initial boot fails
    • 115200 console baud rate

 

 

If the value not in the table, determine which bits are set in order to compute the value:

Bit Number

Hex

Meaning

00-03

0x0000-0x000F

Boots Field Parameters:

  • 0x0000 - Stays at the system bootstrap prompt.
  • 0x0001 - Boots the first system image in onboard Flash memory (EPROM).
  • 0x0002-0x000F- Specifies a default netboot filename. Enables boot system commands that override the default netboot filename.

06

0x0040
  •  
    • Ignore NVRAM contents

07

0x0080
  •  
    • Disable boot messages

08

0x0100
  •  
    • Break disabled

10

0x0400
  •  
    • IP broadcast with all zeros

5,11,12

0x0020, 0x0800, 0x1000
  •  
    • Console line speed

13

0x2000
  •  
    • Boots default ROM software if network boot fails

14

0x4000
  •  
    • IP broadcasts do not have net numbers

15

0x8000
  •  
    • Enables diagnostic messages
    • Ignores NVRAM contents
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