Cisco ASR 9000 Series Aggregation Services Router ROM Monitor Guide
ROM Monitor Overview and Basic Procedures
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Table Of Contents

ROM Monitor Overview and Basic Procedures

ROM Monitor Overview

Entering ROM Monitor Mode

Resetting the Configuration Register and Reloading a RSP Card to ROM Monitor Mode

Prerequisites

Examples

Manually Halting the Initialization Process During System Reload

ROM Monitor Commands

Commonly Used ROM Monitor Commands

Displaying the Available ROM Monitor Commands

Examples

Changing the ROM Monitor Prompt

Displaying the Configuration Register Setting

Environment Variable Settings

Frequently Used Environmental Variables

Displaying Environment Variable Settings

Entering Environment Variable Settings

Saving Environment Variable Settings

Viewing Chassis Serial Numbers

Exiting ROM Monitor Mode

Changing Configuration Register Settings

Resetting to EXEC Mode or MBI Validation Mode

Examples

Additional References

Related Documents

Technical Assistance


ROM Monitor Overview and Basic Procedures

This chapter provides an overview of ROM Monitor concepts and operations. For instructions on how to perform various tasks in ROM Monitor mode (ROMMON), see the other chapters in this book.

This chapter includes the following main topics:

•ROM Monitor Overview

•Entering ROM Monitor Mode

•ROM Monitor Commands

•Displaying the Configuration Register Setting

•Environment Variable Settings

•Exiting ROM Monitor Mode

•Additional References

ROM Monitor Overview

The ROM Monitor is a bootstrap program that initializes the hardware and boots the Cisco IOS XR software when you power on or reload a router. A version of the ROM Monitor software exists on each card. If the Cisco IOS XR software cannot boot on a card, the card startup ends in ROM Monitor mode. When you connect a terminal to a card that is in ROM Monitor mode, the ROM Monitor command-line interface (CLI) prompt is displayed.

Cisco ASR 9000 Series Router Prompt 

rommon B1>

During normal operation, users do not see the ROM Monitor prompt or use ROM Monitor mode. ROM Monitor mode is used only in special circumstances, such as reinstalling the entire software set, resetting the router password, or specifying a configuration file to use at startup.

The ROM Monitor software is known by many names. It is sometimes called ROMMON because of the CLI prompt in ROM Monitor mode. The ROM Monitor software is also called the boot software, boot image, or boot helper. Although it is distributed with routers that use the Cisco IOS XR software, ROM Monitor is a separate program from the Cisco IOS XR software. During normal startup, the ROM Monitor initializes the cards, and then control passes to the Cisco IOS XR software. After the Cisco IOS XR software takes over, ROM Monitor is no longer in use.

Understanding the Role of the Route Switch Processor (RSP) Card

The Cisco ASR 9000 Series Router contains series of chassis slots, each of which can hold one of several types of line cards. Two slots in the chassis are reserved for route switch processors (RSP) cards that provide the central point for chassis provisioning and management.

The active RSP for the owner SDR is called the Designated Shelf Controller (DSC). This card performs system-wide functions. If the active RSP card is placed in ROM Monitor mode, it is no longer running the Cisco IOS XR software. If a standby RSP card is available, then the standby RSP card resumes router operations. If both the RSP cards are not available or if the active RSP (previously standby) is also placed in the ROM Monitor mode, then router operations will stop.

Accessing ROM Monitor Mode on the RSP Card

In most situations, you interact with the ROM Monitor mode only on the RSP cards. The active RSP card contains the administration configuration for the entire system and distributes the required software to all the other nodes in the router. All the tasks in this document describe ROM Monitor mode accessed through the RSP card for the system.

Environmental Variables and the Configuration Register

Two primary connections exist between ROM Monitor and the Cisco IOS XR software: the ROM Monitor environment variables and the configuration register.

The ROM Monitor environment variables define the location of the Cisco IOS XR software and describe how to load it. After ROM Monitor has initialized the card, it uses the environment variables to locate and load the Cisco IOS XR software.

The configuration register is a software setting that controls how a card starts up. One of the primary uses of the configuration register is to control whether the card starts in ROM Monitor mode or Administration EXEC mode. The configuration register is set in either ROM Monitor mode or Administration EXEC mode as needed. Typically, you set the configuration register using the Cisco IOS XR software prompt on the active RSP when you need to use ROM Monitor mode. When the maintenance in ROM Monitor mode is complete, you change the configuration register so the card reboots with the Cisco IOS XR software.

Note Throughout this guide, the term RSP is used to refer to the RSP cards supported on Cisco ASR 9000 Series Routers. If a feature or an issue applies to only one platform, the accompanying text specifies the platform.

Accessing ROM Monitor Mode with a Terminal Connection

When an RSP is in ROM Monitor mode, you can access the ROM Monitor software only from a terminal connected directly to the console port of the card. Because the Cisco IOS XR software (EXEC mode) is not operating, the nonmanagement interfaces (such as GigabitEthernet interfaces) are not accessible. Basically, all Cisco IOS XR software resources are unavailable. The hardware is there, but no configuration exists to make use of the hardware.

Network Management Access and ROM Monitor Mode

Some people get confused when they start to use ROM Monitor mode. It is important to remember that ROM Monitor mode is a router mode, not a mode within the Cisco IOS XR software. It is best to remember that ROM Monitor software and the Cisco IOS XR software are two separate programs that run on the same router. At any given time, the router is running one of these programs, but it never runs both at the same time.

One area that can be confusing when using ROM Monitor and the Cisco IOS XR software is the area that defines the IP configuration for the Management Ethernet interface. Most router users get comfortable with configuring the Management Ethernet interface in the Cisco IOS XR software. When the router is in ROM Monitor mode, however, the router is not running the Cisco IOS XR software, so that Management Ethernet interface configuration is not available.

When you want to access other devices, such as a TFTP server, while in ROM Monitor mode on the Cisco ASR 9000 Series Router, you must configure the ROM Monitor variables with IP access information.

Entering ROM Monitor Mode

The following sections describe two ways to enter ROM Monitor mode:

•Resetting the Configuration Register and Reloading a RSP Card to ROM Monitor Mode

•Manually Halting the Initialization Process During System Reload

Resetting the Configuration Register and Reloading a RSP Card to ROM Monitor Mode

In normal operating conditions, it should not be necessary to use ROM Monitor mode. If you do find it necessary to place an RSP card in ROM Monitor mode, make sure that the system is in a steady state and that you are prepared for the consequences of a system reload. In particular, verify the items described in the "Prerequisites" section.

Prerequisites

Before you place an RSP card in ROM Monitor mode, verify that the system is in a steady state:

1. Prepare the RSP card:

a. Anticipate substantial downtime, including the loss of packet forwarding on the system.

b. Verify the sanity of the configuration file system using the cfs check command in EXEC mode.

c. Verify that all changes to the active router configuration are saved with the commit command in any configuration mode.

d. Verify that all changes to the active software set are saved with the install commit command in Administration EXEC mode.

e. Verify that all install commit processes are complete with the show install committed command in Administration EXEC mode. This command displays the committed packages that become active during the next router boot.

2. Verify that the other nodes in the system are in a steady state:

a. If a standby RSP is installed, verify that it is in the ready state with the show redundancy command in EXEC mode.

b. Verify that all available nodes in the system are in IOS XR RUN state with the show platform command in EXEC mode.

After you have verified that the system is in a stable state, you can enter ROM Monitor mode by setting the configuration register setting and entering the reload command, as described in the following steps:

SUMMARY STEPS

1. Verify that the router is in a steady state.

2. Connect a terminal to the RSP card console port and log in to the router.

3. admin

4. Place an RSP card or all RSP cards in ROM Monitor mode:

•Place an RSP card in the ROM Monitor mode:

a. config-register boot-mode rom-monitor location <node-id>

b. exit

c. reload

or

•Place all the RSP cards in the ROM Monitor mode:

a. config-register boot-mode rom-monitor location all

b. reload location all

Note Entering the config-register boot-mode rom-monitor command places all the RSP cards in the ROM Monitor mode.

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

Verify that the router is in a steady state.

Ensures that all configurations are saved and that no installation processes are running.

•See the "Prerequisites" section

Step 2 

Connect a terminal to the RSP card console port and log in to the router.

Connects a terminal or PC to the RSP card console port and establishes a router management session.

•See "Connecting and Communicating with the Router" in Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide for more information on connecting a terminal.

Step 3 

admin

Example:

rommon B1> admin

Enters administration EXEC mode.

Step 4 

config-register boot-mode rom-monitor location < node-id>

exit

reload

or

config-register boot-mode rom-monitor location a ll

reload location all

Examples:

RP/0/RSP0/CPU0:router# # config-register boot-mode rom-monitor location RP/0/RSP0/CPU0:router(admin)

0 /RSP0/CPU0 )# exit

RP/0/RSP0/CPU0:router(admin# reload

Or,

RP/0/RP/0/RSP0/CPU0:router/CPU0:router(admin)# config-register boot-mode rom-monitor location all

RP/0/RSP0/CPU0:router(admin)# reload location all

Enter the following commands to place only one RSP card (active or standby) in ROM Monitor mode:

a. Enter the boot-mode rom-monitor location <node-id> command, where <node-id> is the ID of the card, to set the configuration register for ROM Monitor mode during the next card reload.

b. Enter the exit command to exit administration EXEC mode.

c. Enter the reload command to reload the card and enter ROM Monitor mode.

Note If you specify the config-register boot-mode rom-monitor command without the location keyword, then all the RSPs are placed in ROM Monitor mode.

Enter the following commands to place all RSPs in ROM Monitor mode:

a. Enter the config-register boot-mode rom-monitor location all command to reset the configuration register for all RSPs in the system.

b. Enter the reload location all command in administration EXEC mode to reload all RSPs in the system.

Note Make sure you have access to the console ports of both RSP0 and RSP1 cards on the system. To enter the system to the ROM Monitor mode, press Ctrl-C few times on both RSP0 and RSP1 consoles until you get to the ROM Monitor mode.

Caution Resetting the configuration register may change the baud rate for the console.

Tip To verify the configuration register setting, enter the show variables boot command in the administration EXEC mode.

Examples

The following examples show how to place the RSP card in ROM Monitor mode:

•Verifying the Router State: Example

•Placing the RSP Cards in ROM Monitor Mode: Example

Verifying the Router State: Example

The following example shows the redundancy roles of both RSPs and shows that both are operating in IOS XR RUN state: 

RP/0/RSP0/CPU0:router# show redundancy

Redundancy information for node 0/RSP0/CPU0:

==========================================

Node 0/RSP0/CPU0 is in ACTIVE role

Partner node (0/RSP1/CPU0) is in STANDBY role

Standby node in 0/RSP1/CPU0 is ready

Standby node in 0/RSP1/CPU0 is NSR-ready

Reload and boot info

----------------------

A9K-RSP-4G-HDD reloaded Tue Nov 18 07:34:53 2008: 19 hours, 20 minutes ago

Active node booted Tue Nov 18 07:34:53 2008: 19 hours, 20 minutes ago

Standby node boot Tue Nov 18 07:39:13 2008: 19 hours, 16 minutes ago

Standby node last went not ready Tue Nov 18 08:08:08 2008: 18 hours, 47 minutes ago

Standby node last went ready Tue Nov 18 08:08:08 2008: 18 hours, 47 minutes ago

There have been 0 switch-overs since reload

RP/0/RSP0/CPU0:router# show platform

Node            Type                      State           Config State

-----------------------------------------------------------------------------

0/RSP0/CPU0     A9K-RSP-4G(Active)        IOS XR RUN      PWR,NSHUT,MON

0/1/CPU0        A9K-40GE-B                IOS XR RUN      PWR,NSHUT,MON

0/4/CPU0        A9K-8T/4-B                IOS XR RUN      PWR,NSHUT,MON

0/6/CPU0        A9K-4T-B                  IOS XR RUN      PWR,NSHUT,MON

Placing the RSP Cards in ROM Monitor Mode: Example

The following example shows how to place the RSP in the ROM Monitor mode: 

RP/0/RSP0/CPU0:router# admin

RP/0/RSP0/CPU0:router(admin)# config-register boot-mode rom-monitor location all

Set to rom-monitor mode for all mgmt nodes:

RP/0/RSP0/CPU0:router(admin)#config-register boot-mode rom-monitor location all

Successfully set config-register to 0x1920 on node 0/RSP0/CPU0

Successfully set config-register to 0x1920 on node 0/RSP1/CPU0

Manually Halting the Initialization Process During System Reload

To force the RSP card to stop loading and enter ROM Monitor mode, press Ctrl-C when you see the following message: 

MBI validation sending request.

HIT Ctrl-C to abort

This message usually appears during the first 20 seconds of system startup. Press the Ctrl-C key combination immediately. It may be necessary to press the Ctrl-C keys repeatedly during this time to ensure that the initialization process stops and the system enters ROM Monitor mode. This ends your Telnet session to the console or auxiliary port.

This operation can be performed only from a terminal directly connected to the RSP card console port. See the "Connecting and Communicating with the Router" section in Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide for more information.

Note When the RSP card is placed in ROMMON, it switches over to the standby RSP card, which can then also be placed in ROMMON. Repeat this process for both RSP cards.

ROM Monitor Commands

The commands in the ROM Monitor mode are different from those available in the Cisco IOS XR software. You can run ROM Monitor commands only while in ROM Monitor mode, and you cannot run Cisco IOS XR software commands. This section includes the following topics:

•Commonly Used ROM Monitor Commands

•Displaying the Available ROM Monitor Commands

•Changing the ROM Monitor Prompt

Commonly Used ROM Monitor Commands

Table 1-1 summarizes the commands commonly used in ROM Monitor. For specific instructions on using these commands, refer to the relevant procedure in this document.

Table 1-1 Commonly Used ROM Monitor Commands 

ROMMON Command
Description

boot image

Manually boots a vm Cisco IOS XR software image.

boot image -o config-file-path

Manually boots the Cisco IOS XR software with a temporary alternative administration configuration file.

boot tftp://config-file-path/image

 

Manually boots the Cisco IOS XR software with an temporary default SDR configuration file. The system can also be booted from external compactflash using Cisco ASR 9000 Series Router Image Refresh method. For more information about Image Refresh method, see .

cookie

Displays the system cookie.

confreg

Changes the config-register setting.

Note When the value of confreg is 0, it means autoboot is disabled and you need to manually boot the Cisco IOS XR software image from the ROM Monitor mode. However, if the value of confreg is non-zero value of 0x2, it means autoboot is enabled and the ROM Monitor mode automatically boots the Cisco IOS XR software image given in the BOOT= environment variable.

dev

Displays the available local storage devices (for example, disk0: and disk1:).

dir

Displays the files on a storage device.

bpcookie

 

Displays the chassis serial number, MAC address, MAC range, PID, Controller type, version, and so on, in a Cisco ASR 9000 Series Router.

 

reset

Resets the node.

set

Displays the currently set ROM Monitor environmental settings.

sync

Saves the new ROM Monitor environmental settings.

unset

Removes an environmental variable setting.

version

Displays the ROM Monitor version.


Displaying the Available ROM Monitor Commands

Table 1-2 describes the available help commands for ROM Monitor mode.

Table 1-2 Help Commands in ROMMON

Command
Description

help or ?

Displays a summary of all available ROM Monitor commands.

-?

Displays information about command syntax.


Note Commands are case sensitive. You can halt any command by pressing Ctrl-C.

Examples

The following example shows what appears when you enter the ? command on a Cisco ASR 9000 Series Router: 

rommon B1> ?

alias               set and display aliases command

boot                boot up an external process

bpcookie            display the backplane cookie

cbcinfo             Display information from CBC

cbcmsg              Send a message to the CBC

cbcping             Send "PING" to CBC LED Matrix

clocks              get CPU clock information

confreg             configuration register utility

cookie              display the system cookie

dev                 list the device table

dir                 list files in file system

dimminfo            Display info for DDR DIMMs

dis                 disassemble instruction stream

dnld                serial download a program module

dump                display a block of memory

ddump               display a block of memory as double words

dumpspd             display DDR2 SPD information

fpgainfo            display information about FPGA images

ftcookie            display the fan tray cookie

help                monitor builtin command help

history             monitor command history

meminfo             main memory information

portstatus          Show 6 port switch port status

repeat              repeat a monitor command

reset               system reset

showrobfl           show run logs

rominfo             display the ROMMON header information

scanpci1            scan for devices on PCI bus 1

scanpci2            scan for devices on PCI bus 2

set                 display the monitor variables

sync                write monitor environment to NVRAM

unalias             unset an alias

unset               unset a monitor variable

version             display rommon software, board, version

The following example shows the parameters for the dir (directory) command: 

rommon B1> dir -?

bad device name

usage: dir <device>

The following example shows what appears when you enter the version command at the Cisco ASR 9000 Series Router ROM Monitor mode prompt: 

rommon B1 > version

System Bootstrap, Version 1.0(20081208:173612) [ASR9K ROMMON], 

Copyright (c) 1994-2008 by Cisco Systems, Inc.

Compiled Mon 08-Dec-08 09:36 by abc

  LNC2:  1.17  [00000001/00000011]

  TMPO:  1.13  [00000001/0000000d]

  LB_3:  1.14  [00000001/0000000e]

  PUNT:  1.4   [00000001/00000004]

   CBC:  1.1 

   BID: 0x0004

Changing the ROM Monitor Prompt

You can change the prompt in ROM Monitor mode by using the PS1= command as shown in the following example: 

rommon B1> PS1= "ASR9K_ROMMON B1 ! >"

Changing the prompt is useful if you are working with multiple routers in ROM Monitor at the same time. This example specifies that the prompt is "ASR9K_ROMMON B" followed by the line number.

Displaying the Configuration Register Setting

To display the current configuration register setting, enter the confreg command without parameters as follows: 

rommon B1> confreg

			Configuration Summary

   (Virtual Configuration Register: 0x1920)

enabled are:

console baud: 9600

boot: the ROM Monitor

do you wish to change the configuration? y/n  [n]:

The configuration register setting is labeled Virtual Configuration Register. Enter the no command to avoid changing the configuration register setting. To change the configuration setting with this command, see the "Changing Configuration Register Settings" section.

Environment Variable Settings

The ROM Monitor environment variables define the attributes of the ROM Monitor, such as the IP address for an RSP control Ethernet port or the location of the Cisco IOS XR software and describe how to load it. Environmental variables are entered like commands and are always followed by the equal sign (=). Environment variable settings are entered in capital letters, followed by a definition. For example: 

TURBOBOOT=on,disk0,format

Under normal operating conditions, you do not need to modify these variables. They are cleared or set only when you need to make changes to the way ROM Monitor operates.

This section includes the following topics:

•Frequently Used Environmental Variables

•Displaying Environment Variable Settings

•Entering Environment Variable Settings

•Saving Environment Variable Settings

Frequently Used Environmental Variables

Table 1-3 shows the main ROM Monitor environmental variables. For instructions on how to use these variables, see the relevant instructions in this document.

Table 1-3 Frequently Used ROM Monitor Environmental Variables 

Environmental variable
Description

TFTP_MGMT_INTF={0 | 1}

Determines the RSP card Management LAN port to use for TFTP. The default value is port 0.

IP_ADDRESS=ip_address

Sets the IP address for the Management Ethernet interface on the RSP card.

IP_SUBNET_MASK=ip_address

Sets the subnet mask for the Management Ethernet interface on the RSP card.

DEFAULT_GATEWAY=ip_address

Sets the default gateway that serves the RSP card.

TFTP_SERVER=ip_address

Sets the IP address of the TFTP server where a bootable software image is located.

TFTP_FILE=drive:path/file

Sets the directory and filename of a bootable software image.

TURBOBOOT=on, boot-device, options

Completely replaces the existing software when the router is reloaded. See the "About the TURBOBOOT Variable" section for more information on the TURBOBOOT environment variable.

Note The default boot device disk is disk0:.

BOOT=drive:path/file

Identifies the boot software for a node. This variable is usually set automatically when the router boots.

BOOT_DEV_SEQ_OPER=drive:

Specifies the sequence of local storage devices in which the disk-boot operation occurs. (For example, the disk0:;disk1: sequence indicates to boot from disk0: device initially and if failure occurs, boot from the disk1: device.

BOOT_DEV_SEQ_CONF=drive:

Indicates the configured primary and secondary devices (disk0: and disk1:) for disk mirroring. This variable is usually set by Cisco IOS XR.

AUX_AUTHEN_LEVEL=number

Bypasses ksh authentication. A reboot is required only on the card that has to bypass authentication.

IOX_ADMIN_CONFIG_FILE=
drive:path/file

Permanently changes the location of the default Administration configuration file.

IOX_CONFIG_FILE=drive:path/file

Permanently changes the location of the router configuration file.

IOX_CONFIG_MEDIUM=drive:path

Permanently changes the default location where configuration files are saved.

MIRROR_ENABLE=value

Sets to Y in Cisco IOS XR to indicate disk mirroring is enabled. When it is set to N, it indicates disk mirroring is disabled.


Displaying Environment Variable Settings

To display the current environment variable settings, enter the set command at the ROM Monitor mode prompt : 

rommon B1> set

PS1=RO RSP P4D-17 ! >

IP_ADDRESS=172.29.52.137

DEFAULT_GATEWAY=172.29.52.1

IP_SUBNET_MASK=255.255.255.0

TFTP_SERVER=172.23.16.81

IOX_ADMIN_CONFIG_FILE=

TFTP_MGMT_INTF=0

BOOT_DEV_SEQ_CONF=disk0:;disk1:

MIRROR_ENABLE=Y

?=0

TFTP_FILE=/auto/tftpboot-users/lpatton/comp-asr9k-mini.vm-3.9.0.08I.DT_IMAGE

TURBOBOOT=

BSI=0

BOOT_DEV_SEQ_OPER=disk0:;disk1:

BOOT=disk0:asr9k-os-mbi-3.9.0.08I/mbiasr9k-rp.vm,1;

ReloadReason=1

Entering Environment Variable Settings

Environment variable settings are entered in capital letters, followed by a definition. The following example shows the environmental variables used to configure the control Ethernet port on a Cisco ASR 9000 Series Router: 

rommon B1> IP_ADDRESS=1.1.1.1

rommon B2> IP_SUBNET_MASK=255.255.254.0

rommon B3> DEFAULT_GATEWAY=1.1.0.1

Saving Environment Variable Settings

To save the current environment variable settings, enter the sync command: 

rommon B1> sync

Note Environmental values that are not saved with the sync command are discarded whenever the system is reset or booted.

Viewing Chassis Serial Numbers

The chassis serial number can be read from an RSP that is running in ROM Monitor mode. Viewing the chassis number from the RSP may be necessary if the physical label is missing or damaged.

Step 1 Attach a console to the console port of an RSP in the chassis. (Only the RSP card needs to run to perform this procedure. Other cards need not be inserted.)

Step 2 If you have not already done so, apply power to the chassis.

Step 3 Enter ROM Monitor mode, as described in the "Entering ROM Monitor Mode" section.

Step 4 Enter the bpcookie command in the privilege mode of ROM Monitor prompt to display the chassis serial number. 

	RO RSP2 P3A-27 B1> bpcookie

        Controller Family        : ef

        Controller Type          : 2fe

        Product Number           : ASR-9010-AC

        Version Identifier       : V01

        UDI Product Name         : ASR-9010-AC

        UDI Product Description  : ASR-9010 AC Chassis

        Part Number (68-bbbb-vv) : 68-3163-02

        Part Revision            : B0  

        Chassis Serial Number    : FOX1316G5TL

        Mainboard Serial Number  : NWG131300HA

        PCB Serial Number        : NWG13310024

        PCA Number (73-bbbb-vv)  : 73-11674-02

        PCA Revision             : A0

        CLEI Code                : IPMKK10ARA

        Deviation Number # 1     : 0

        Deviation Number # 2     : 0

        Deviation Number # 3     : 0

        Deviation Number # 4     : 0

        Deviation Number # 5     : 0

        Manufacturing Test Data  : 00 00 00 00 00 00 00 00 

        Base MAC Address         : 0024.f715.1888

        MAC Address block size   : 1288

        Hardware Revision        : 1.0

        Capabilities             : 00

        Device values            :

Step 5 Return the router to EXEC mode, as described in the "Resetting to EXEC Mode or MBI Validation Mode" section.

Exiting ROM Monitor Mode

To exit ROM Monitor mode, you must change the configuration register and reset the RSP.

Changing Configuration Register Settings

To change the configuration register settings in the ROM Monitor mode, enter the confreg command at the ROM Monitor mode. Entering this command displays the configuration summary and the prompts used to change the configuration.

SUMMARY STEPS

1. confreg

2. Respond to each prompt as instructed.

3. reset

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

confreg

Example:

rommon B1> confreg

Initiates the configuration register configuration prompts.

Step 2 

Respond to each prompt as instructed.

See the example that follows this procedure for more
information.

Step 3 

reset

Example:

rommon B2> reset

Resets and initializes the router.

Resetting to EXEC Mode or MBI Validation Mode

To exit the ROM Monitor mode and reset to EXEC mode, enter the confreg command at the ROM Monitor mode prompt. Respond to prompts as instructed.

The prompts that are shown when you enter the confreg command are as follows:

Examples

The following example shows how to enable ROM Monitor mode at the next system boot: 

rommon B5 > confreg

           Configuration Summary

   (Virtual Configuration Register: 0x1920)

enabled are:

console baud: 9600

boot: the ROM Monitor

do you wish to change the configuration? y/n  [n]:  y

enable  "diagnostic mode"? y/n  [n]:  n

change console baud rate? y/n  [n]:  n

change the boot characteristics? y/n  [n]:  y

enter boot type:

 0 = ROM Monitor

 2 = MBI Validation Boot Mode

    [0]:  0

           Configuration Summary

   (Virtual Configuration Register: 0x1920)

enabled are:

console baud: 9600

boot: the ROM Monitor

do you wish to change the configuration? y/n  [n]: n 

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

rommon B6 > reset

The following example shows how to enter the minimum boot image (MBI) validation mode or the EXEC mode of Cisco IOS XR software at the next system boot: 

rommon B7 > confreg

           Configuration Summary

   (Virtual Configuration Register: 0x1920)

enabled are:

console baud: 9600

boot: the ROM Monitor

do you wish to change the configuration? y/n  [n]:  y

enable  "diagnostic mode"? y/n  [n]:  n

change console baud rate? y/n  [n]:  n

change the boot characteristics? y/n  [n]:  y

enter boot type:

 0 = ROM Monitor

 2 = MBI Validation Boot Mode

    [0]:  2

           Configuration Summary

   (Virtual Configuration Register: 0x1922)

enabled are:

console baud: 9600

boot: MBI Boot

do you wish to change the configuration? y/n  [n]: n 

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

rommon B8 > reset

To reset to the EXEC mode or the MBI Validation mode, select the boot type as 2. Enter the reset command to boot the RSP in the EXEC mode.

Note Minimum Boot Image (MBI) validation mode causes the RSP to boot the startup Cisco IOS XR software and configuration.

Additional References

The following sections provide references related to the ROM Monitor.

Related Documents

Related Topic
Document Title

Connecting a terminal to a router.

"Connecting and Communicating with the Router" in Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide

Configuring a router with Cisco IOS XR software

Cisco IOS XR Software Documentation:
http://www.cisco.com/en/US/products/ps5845/tsd_products_support_series_home.html


Technical Assistance

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http://www.cisco.com/techsupport