Cisco Systems 12406, 12006 Manually Booting the System, Locating a Valid Cisco IOS Software Image

Chapter 3 Installing the Router

IOS Software Configuration for the Router

Manually Booting the System

If your router does not find a valid system configuration image, or if you interrupt the boot sequence, the system might enter read-only memory (ROM) monitor mode and display the ROM monitor prompt (rommon>). From ROM monitor mode, you have access to a number of commands to locate and boot a valid system image.

Locating a Valid Cisco IOS Software Image

To locate a Cisco IOS software image for manually booting the router from the ROM monitor prompt (rommon>), follow the steps below:

Step 1 Use the ROM monitor mode dir bootflash command to examine the contents of the onboard Flash memory SIMM (NVRAM) on the RP:

rommon	1> dir bootflash:
File size		Checksum	File name
3277967 bytes (0x32048f)		0x6b331e30	gsr-p-mz.120-7.4.5
rommon	2>

Step 2 If the onboard Flash memory SIMM contains the desired Cisco IOS boot image, proceed to the “Booting from the Cisco IOS Software Image” section on

page 3-48. Otherwise, continue looking for a valid image by examining the contents of the Flash memory card in either PCMCIA slot 0 or slot 1 on the RP.

You can determine the content of the card by issuing the ROM monitor mode dir slotn: command, where n represents either 0 (slot 0) or 1 (slot 1). The following example of the command lists the contents of the Flash memory card in slot 0:

rommon	2> dir slot0:
File size		Checksum	File name
3277967 bytes (0x32048f)		0x6b331e30	gsr-p-mz.120-7.4.5
rommon	3>

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03		3-47