Cisco Systems 2600 manual ROM Monitor Commands, Enter ROM Monitor Mode by Using the reload Command

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Appendix B Using the ROM Monitor

ROM Monitor Commands

As long as the configuration register value remains 0x0, you must manually boot the operating system from the console. Refer to the boot command in the “ROM Monitor Command Descriptions” section on page B-4.

The two methods of entering the ROM monitor mode are as follows:

Enter ROM Monitor Mode by Using the reload Command

Connect to the router from a console, and follow these steps:

Step 1 Restart the router with the reload command.

Router# reload

Step 2 Press the Break key during the first 60 seconds of the system booting.

This forces the router into ROM monitor mode, and the ROM monitor prompt is displayed:

rommon 1>

Enter ROM Monitor Mode by Resetting the Configuration Register

Connect to the router from a console, and follow these steps:

Step 1 Set the bits 3, 2, 1, and 0 of the configuration register to zero:

Router# configuration-register 0x0

Step 2 Restart the router with the reload command:

The router boots into the ROM monitor mode, and the ROM monitor prompt is displayed:

rommon 1>

Note The number that appears in the ROM monitor prompt (1>, 2>, and so forth) is the line number. It increments each time you enter a ROM monitor command.

ROM Monitor Commands

Showing ROM Monitor Commands

Enter ? or help at the ROM monitor prompt to see a list of available commands. For example:

 

 

 

rommon 1>

?

 

 

 

 

 

alias

set and

display aliases command

 

 

 

boot

boot up

an external process

 

 

 

break

set/show/clear the breakpoint

 

 

 

confreg

configuration register utility

 

 

 

cont

continue executing a downloaded image

 

 

 

context

display

the context of a loaded image

 

 

 

cookie

display

contents of cookie PROM in hex

 

 

 

dev

list the device table

 

 

 

Cisco 2600 Series Routers Hardware Installation Guide

 

 

 

 

 

 

 

 

 

 

 

B-2

 

 

 

OL-2171-06

 

 

 

 

 

 

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Contents Cisco 2600 Series Routers Hardware Installation Guide Corporate HeadquartersCisco 2600 Series Routers Hardware Installation Guide N T E N T S IiiSerial DTE or DCE Devices Initial Configuration Using the Setup Command Facility Procedure for the tftpdnld Command Configuration Register Objectives ViiConventions AudienceOrganization Chapter Title DescriptionSafety Warnings Bewaar Deze InstructiesWarnung Wichtige Sicherheitshinweise Avvertenza Importanti Istruzioni Sulla SicurezzaAviso Instruções Importantes DE Segurança Guarde Estas InstruçõesGEM Disse Anvisninger XiiXiii Related Documentation XivCisco Product Document Title Replacement, Repair, or Refund Policy for Hardware Cisco 90-Day Limited Hardware Warranty TermsDuration of Hardware Warranty XviCisco.com Obtaining DocumentationDocumentation Feedback Ordering DocumentationCisco Technical Support Website Submitting a Service RequestObtaining Technical Assistance XviiiObtaining Additional Publications and Information Definitions of Service Request SeverityXix Preface Obtaining Additional Publications and Information Hardware Features Overview of Cisco 2600 Series RoutersAdvanced CiscoPower Reading the Front-Panel LEDsPWR RPSActivity SYS/RPSReading the Rear-Panel LEDs ACTCisco 2613-Rear-Panel LEDs ACT LinkFDX Modules, Interface Cards, and Memory CF1Interface Numbering WAN and LAN Interface Numbering11 Interface Numbering in Chassis with 1-RU Height Description Specification System SpecificationsVoice Interface Numbering Regulatory Compliance Safety Recommendations Safety with ElectricityPreventing Electrostatic Discharge Damage General Site Requirements Power Supply ConsiderationsPower Source Input Power Tolerance Limits Site EnvironmentSite Configuration Installation ChecklistEquipment Racks Creating a Site Log Task Verified by DateTools and Equipment for Installation and Maintenance Inspecting the RouterConsole and Auxiliary Port Considerations Console Port ConnectionsPreparing to Connect to a Network Auxiliary Port ConnectionsEthernet Connections Token Ring ConnectionsSerial Connections Configuring Serial ConnectionsSerial DTE or DCE Devices Distance Limitations Signaling Standards SupportedDevice Type Gender Typical Devices EIA/TIA-232 Isdn BRI ConnectionsAsynchronous/Synchronous Serial Module Baud Rates Distance EIA-530 Distance Rate bps Feet Meters56-K/Switched-56-kbps DSU/CSU Connections Low-Capacitance CableOL-2171-06 Installing the Router For WICs and VICs Installing Modules, Interface Cards, and Power SuppliesFor network modules For AIMsFor internal power supplies Setting Up the ChassisSetting the Chassis on a Desktop For external power suppliesMounting the Chassis in a Rack Right To the other side of the chassis. Brackets for 19-inch rack Brackets for 19-inch rack To the other side of the chassis Attaching the Brackets to a Router of 2-RU Height Use two screws on each side For 19-inch rack Right bracketInstalling the Router in a Rack V0 ENAttaching Rubber Feet to the Router Mounting the Chassis on the WallAttaching Wall-Mount Brackets to the Router Mounting the Router on the Wall 16 Attaching the Wall-Mount BracketsInstalling the Chassis Ground Connection 17 Mounting the Chassis on the WallRing terminal Power Connections Connecting Routers to AC PowerRouter DC Input DC Input Wire Size1 Connecting Routers to a DC-Input Power SupplyDC Wiring Requirements 15A, 120VAC 10A, 240VAC. StatementWiring Procedure for DC Input Ports and Cabling Connecting WAN, LAN, and Voice CablesConnecting Routers to the Cisco Redundant Power System Port or Connection Port Type, Color Connected To CableLAN, WAN, and Voice Connection Procedures Connecting to a Console Terminal or Modem Connecting to the Console PortConnecting to the Auxiliary Port 23 Connecting to a Console Terminal24 Connecting a Modem to the Auxiliary Port Identifying a Rollover CableFront Panel Indicators Powering Up the RouterChecklist for Power Up Routers with 1-RU Chassis HeightPower-Up Procedure Routers with 2-RU Chassis HeightConfiguring the Router Initial Configuration Using SDM Initial Configuration Using the Setup Command FacilityEnter a hostname for the router this example uses Initial Configuration Using the CLI Manual Configuration Configuration is displayedTo proceed with manual configuration using the CLI, enter no OL-2171-06 Troubleshooting Isolating ProblemsTroubleshooting the Power and Cooling Systems Environmental Reporting FeaturesTroubleshooting Modules, Cables, and Connections System Messages Recovering a Lost PasswordCisco Technical Assistance Center Using the ROM Monitor Entering ROM Monitor ModeROM Monitor Commands Enter ROM Monitor Mode by Using the reload CommandROM Monitor Command Syntax Conventions Command abcRouter Management Commands ROM Monitor Command DescriptionsBoot Commands in the ROM Monitor Informational Commands in the ROM Monitor Debugging Commands Other Useful ROM Monitor CommandsConfiguration Register Commands Modifying the Configuration Register in Menu ModeRecovering Cisco IOS Software Images Modifying the Configuration Register by Hexidecimal EntryProcedure for the xmodem Command Copying an Image from the Console Using the xmodem CommandDescription and Options of the xmodem Command Console RequirementsRestrictions on the tftpdnld Command Procedure for the tftpdnld Command Specify the required variables, for exampleDEFAULTGATEWAY=172.16.19.1 Bit Number Hexadecimal Meaning Configuration Register SettingsNvram Changing Configuration Register Settings Configuring the Boot Field Boot Field MeaningBit Address net host Enabling Booting from Flash Memory Baud BitOL-2171-06 Numerics IN-1Dram IN-2Link LED Isdn BRILAN IN-3Sdram IN-4IN-5 IN-6
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