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ROM Monitor
This appendix describes the Cisco router ROM monitor (also called the bootstrap
program). The ROM monitor firmware runs when the router is powered up or
reset. The firmware helps to initialize the processor hardware and boot the
operating system software. You can perform certain configuration tasks, such as
recovering a lost password or downloading software over the console port, by
using the ROM monitor. If there is no Cisco IOS software image loaded on the
router, the ROM monitor runs the router.
This appendix contains the following sections:

Entering the ROM Monitor

To use the ROM monitor, you must be using a terminal or PC that is connected to
the router by means of the console port. Refer to the installation chapter in the
Hardware Installation Guide for your router, for information about connecting the
router to a PC or terminal.
78-5407-03
Entering the ROM Monitor
ROM Monitor Commands
Command Descriptions
Disaster Recovery with TFTP Download
Configuration Register
Console Download
A P P E N D I X
Cisco 1700 Series Router Software Configuration Guide
B
B-1

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   Summary of Contents for Cisco 1700

  • Page 1: Entering The Rom Monitor

    Refer to the installation chapter in the Hardware Installation Guide for your router, for information about connecting the router to a PC or terminal. 78-5407-03 A P P E N D I X Cisco 1700 Series Router Software Configuration Guide...

  • Page 2

    (on or off) in the configuration register. During this 60-second window, you can break to the ROM monitor prompt by pressing the Break key. Cisco 1700 Series Router Software Configuration Guide Router Prompt Task If there is an enable password configured, enter Router>...

  • Page 3: Rom Monitor Commands

    NVRAM print out info from last system return tftp image download unset an alias unset a monitor variable x/ymodem image download Cisco 1700 Series Router Software Configuration Guide ROM Monitor Commands...

  • Page 4: Command Descriptions

    Common ROM Monitor Commands Command help or ? reset or i dir device: Cisco 1700 Series Router Software Configuration Guide describes commonly used ROM monitor commands. Description Displays a summary of all available ROM monitor commands. Displays information about command syntax, for example: rommon 16 >...

  • Page 5: Disaster Recovery With Tftp Download

    Attempts to boot the image directly from the second partition of Flash memory. If you do not enter a filename, this command will boot the first image in the second partition of Flash memory. Cisco 1700 Series Router Software Configuration Guide Disaster Recovery with TFTP Download...

  • Page 6: Required Variables

    Variable Whether or not the router performs a checksum test on the downloaded image: 1—Checksum test is performed. 0—No checksum test is performed. Cisco 1700 Series Router Software Configuration Guide Appendix B ROM Monitor Command IP_ADDRESS= ip_address IP_SUBNET_MASK= ip_address DEFAULT_GATEWAY= ip_address...

  • Page 7: Using The Tftp Download Command

    Use the appropriate commands to enter all the required variables and any optional Step 1 variables. Enter the tftpdnld command as follows: Step 2 rommon 1 > tftpdnld [ -r ] 78-5407-03 Disaster Recovery with TFTP Download Command TFTP_RETRY_COUNT= retry_times TFTP_TIMEOUT= time TFTP_VERBOSE= setting Cisco 1700 Series Router Software Configuration Guide...

  • Page 8: Configuration Register

    To change the virtual configuration register from the ROM monitor, enter confreg by itself for menu mode, or enter the new value of the register in hexadecimal. For example: confreg [ hexnum ] Cisco 1700 Series Router Software Configuration Guide TFTP_SERVER: 223.255.254.254 TFTP_FILE: c1700-bnr2sy-mz.070298 [n]:...

  • Page 9

    ROM Monitor do you wish to change the configuration? y/n You must reset or power cycle for new config to take effect 78-5407-03 [n]: [n]: Cisco 1700 Series Router Software Configuration Guide Configuration Register [n]: [n]: [n]: [n]:...

  • Page 10: Console Download

    The syntax is as follows: xmodem [-cyrx] destination_file_name The argument descriptions are as follows: Argument Cisco 1700 Series Router Software Configuration Guide B-10 Description Optional. Performs the download using 16-bit cyclic redundancy check (CRC) error checking to validate packets.

  • Page 11: Error Reporting

    The name of the system image file or the system configuration file. In order for the router to recognize it, the name of the configuration file must be router_confg. Cisco 1700 Series Router Software Configuration Guide Console Download B-11...

  • Page 12: Debug Commands

    R12 = 0x00000080 0xffffffff R16 = 0xffffffff 0xffffffff R20 = 0xffffffff 0xffffffff R24 = 0xffffffff 0xffffffff Cisco 1700 Series Router Software Configuration Guide B-12 PC = 0x801111b0 PC = 0x80113694 PC = 0x8010eb44 PC = 0x80008118 PC = 0x80008064 PC = 0xfff03d70...

  • Page 13

    Available main memory starts at 0x10000, size 65472KB IO (packet) memory size: 25 percent of main memory. NVRAM size: 32KB 78-5407-03 R29 = 0xffffffff R30 = 0xffffffff reason: user break error address: 0x801111b0 Cisco 1700 Series Router Software Configuration Guide Debug Commands B-13...

  • Page 14

    Appendix B ROM Monitor Debug Commands Cisco 1700 Series Router Software Configuration Guide B-14 78-5407-03...

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