Chapter 5 Troubleshooting Initial Startup Problems

ROMmon Prompt: rommon >

Last reset from power-on 1 FastEthernet interface

4 Gigabit Ethernet interfaces

2045K bytes of NVRAM.

250880K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes). 65536K bytes of Flash internal SIMM (Sector size 512K). Uncompressed configuration from 1000 bytes to 1703 bytes

Press RETURN to get started!

7201>

b.If the flash file system does not have a valid Cisco IOS image, enter confreg 0x1, followed by reset.

rommon 2 > confreg 0x1

You must reset or power cycle for new config to take effect rommon 3 > reset

System Bootstrap, Version 12.4(12.2r)T, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 2006 by cisco Systems, Inc.

<startup boot messages removed for brevity> 7201_devtest2(boot)>

After entering these commands, follow the instructions in the “ROMmon Prompt: rommon >” section on page 5-10to download a valid Cisco IOS image.

Step 3 (Optional) Set the configuration register using the config-registercommand. If you want the router to be in ROMmon mode after a reboot, this step is not necessary. To set the configuration register to reboot to the router prompt, enter the config-register 0x2 command.

7201# configure terminal 7201(config)# config-register 0x2

See Appendix C, “Configuration Register Information,” for additional information regarding configuration register settings.

Step 4 (Optional) Save the configuration using the copy running-configstartup-configcommand. This step is especially important if you wish to save the configuration register settings.

Complete Boot Prompt and ROMmon Prompt Example

In the following example, a Cisco 7201 router starting in boot mode downloads a Cisco IOS image to Flash memory, reboots into ROMmon mode, and boots the Cisco IOS image from ROMmon mode to enter the Cisco IOS CLI.

7201(boot)# ping 2.0.0.2

 

 

Type escape sequence to abort.

 

 

 

 

 

 

Sending 5, 100-byte ICMP Echos

to 2.0.0.2, timeout is 2 seconds:

 

 

 

Cisco 7201 Installation and Configuration Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OL-11364-04

 

 

 

5-11

 

 

 

 

 

 

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Cisco Systems CISCO7201 Complete Boot Prompt and ROMmon Prompt Example, Gigabit Ethernet interfaces 2045K bytes of Nvram