Appendix B Using the ROM Monitor
Recovering Cisco IOS Software Images
enter | to | boot: |
0 | = | | ROM | Monitor |
1 | = | | the | boot helper image |
2-15 | = boot system |
| | [0]: | 0 |
Configuration Summary enabled are: diagnostic mode break/abort has effect console baud: 9600 boot: the ROM Monitor
do you wish to change the configuration? y/n [n]:
You must reset or power cycle for new config to take effect
Modifying the Configuration Register by Hexidecimal Entry
Entering the confreg command plus a hexidecimal value changes the contents of the configuration register. The syntax is confreg [hexnum]; values entered are always interpreted as hexadecimal. The following example changes the value of the configuration register to the factory default:
rommon 7> confreg 0x2102
You must reset or power cycle the router for new configuration to take effect.
Recovering Cisco IOS Software Images
If your Cisco router experiences difficulties and no longer contains a valid Cisco IOS software image in flash memory, you can download a new Cisco IOS image using one of the following ROM monitor commands:
•xmodem—(All Cisco 2600 series routers) Use this command to copy a Cisco IOS image from the console, if the computer attached to your console has a terminal emulator with Xmodem capability. See the “Copying an Image from the Console Using the xmodem Command” procedure on
Note Downloading a Cisco IOS image from a console is very slow. This procedure should be used only in an emergency and is not recommended for normal Cisco IOS image upgrades.
For the fastest possible download from a console, set the console speed to 115200 bps by using the confreg ROM monitor command. See the “Configuration Register Commands” procedure on page B-7.
•tftpdnld—(Except Cisco 2691) Use this command to copy a Cisco IOS image from a TFTP server that is accessible through the FastEthernet 0/0, Ethernet 0/0, or Token Ring 0/0 port. See the “Copying an Image from a TFTP Server Using the tftpdnld Command” procedure on page B-10.
Cisco 2600 Series Routers Hardware Installation Guide
Cisco 2600 Series Routers Hardware Installation Guide
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Cisco 2600 Series Routers Hardware Installation Guide
N T E N T S
Iii
Serial DTE or DCE Devices
Initial Configuration Using the Setup Command Facility
Procedure for the tftpdnld Command Configuration Register
Objectives
Vii
Audience
Organization
Conventions
Chapter Title Description
Safety Warnings
Bewaar Deze Instructies
Warnung Wichtige Sicherheitshinweise
Avvertenza Importanti Istruzioni Sulla Sicurezza
Aviso Instruções Importantes DE Segurança
Guarde Estas Instruções
GEM Disse Anvisninger
Xii
Xiii
Related Documentation
Xiv
Cisco Product Document Title
Cisco 90-Day Limited Hardware Warranty Terms
Duration of Hardware Warranty
Replacement, Repair, or Refund Policy for Hardware
Xvi
Obtaining Documentation
Documentation Feedback
Cisco.com
Ordering Documentation
Submitting a Service Request
Obtaining Technical Assistance
Cisco Technical Support Website
Xviii
Obtaining Additional Publications and Information
Definitions of Service Request Severity
Xix
Preface Obtaining Additional Publications and Information
Hardware Features
Overview of Cisco 2600 Series Routers
Advanced
Cisco
Power
Reading the Front-Panel LEDs
RPS
Activity
PWR
SYS/RPS
Reading the Rear-Panel LEDs
ACT
Cisco 2613-Rear-Panel LEDs
ACT
Link
FDX
Modules, Interface Cards, and Memory
CF1
Interface Numbering
WAN and LAN Interface Numbering
11 Interface Numbering in Chassis with 1-RU Height
Description Specification
System Specifications
Voice Interface Numbering
Regulatory Compliance
Safety Recommendations
Safety with Electricity
Preventing Electrostatic Discharge Damage
Power Supply Considerations
Power Source Input Power Tolerance Limits
General Site Requirements
Site Environment
Site Configuration
Installation Checklist
Equipment Racks
Creating a Site Log
Task Verified by Date
Tools and Equipment for Installation and Maintenance
Inspecting the Router
Console and Auxiliary Port Considerations
Console Port Connections
Preparing to Connect to a Network
Auxiliary Port Connections
Ethernet Connections
Token Ring Connections
Serial Connections
Configuring Serial Connections
Serial DTE or DCE Devices
Distance Limitations
Signaling Standards Supported
Device Type Gender Typical Devices
Isdn BRI Connections
Asynchronous/Synchronous Serial Module Baud Rates
EIA/TIA-232
Distance EIA-530 Distance Rate bps Feet Meters
56-K/Switched-56-kbps DSU/CSU Connections
Low-Capacitance Cable
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Installing the Router
Installing Modules, Interface Cards, and Power Supplies
For network modules
For WICs and VICs
For AIMs
Setting Up the Chassis
Setting the Chassis on a Desktop
For internal power supplies
For external power supplies
Mounting 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 bracket
Installing the Router in a Rack
V0 EN
Attaching Rubber Feet to the Router
Mounting the Chassis on the Wall
Attaching Wall-Mount Brackets to the Router
Mounting the Router on the Wall
16 Attaching the Wall-Mount Brackets
Installing the Chassis Ground Connection
17 Mounting the Chassis on the Wall
Ring terminal
Power Connections
Connecting Routers to AC Power
Connecting Routers to a DC-Input Power Supply
DC Wiring Requirements
Router DC Input DC Input Wire Size1
15A, 120VAC 10A, 240VAC. Statement
Wiring Procedure for DC Input
Connecting WAN, LAN, and Voice Cables
Connecting Routers to the Cisco Redundant Power System
Ports and Cabling
Port or Connection Port Type, Color Connected To Cable
LAN, WAN, and Voice Connection Procedures
Connecting to a Console Terminal or Modem
Connecting to the Console Port
Connecting to the Auxiliary Port
23 Connecting to a Console Terminal
24 Connecting a Modem to the Auxiliary Port
Identifying a Rollover Cable
Powering Up the Router
Checklist for Power Up
Front Panel Indicators
Routers with 1-RU Chassis Height
Power-Up Procedure
Routers with 2-RU Chassis Height
Configuring the Router
Initial Configuration Using SDM
Initial Configuration Using the Setup Command Facility
Enter a hostname for the router this example uses
Initial Configuration Using the CLI Manual Configuration
Configuration is displayed
To proceed with manual configuration using the CLI, enter no
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Troubleshooting
Isolating Problems
Troubleshooting the Power and Cooling Systems
Environmental Reporting Features
Troubleshooting Modules, Cables, and Connections
System Messages
Recovering a Lost Password
Cisco Technical Assistance Center
Using the ROM Monitor
Entering ROM Monitor Mode
ROM Monitor Commands
Enter ROM Monitor Mode by Using the reload Command
ROM Monitor Command Syntax Conventions
Command abc
Router Management Commands
ROM Monitor Command Descriptions
Boot Commands in the ROM Monitor
Informational Commands in the ROM Monitor
Debugging Commands
Other Useful ROM Monitor Commands
Configuration Register Commands
Modifying the Configuration Register in Menu Mode
Recovering Cisco IOS Software Images
Modifying the Configuration Register by Hexidecimal Entry
Copying an Image from the Console Using the xmodem Command
Description and Options of the xmodem Command
Procedure for the xmodem Command
Console Requirements
Restrictions on the tftpdnld Command
Procedure for the tftpdnld Command
Specify the required variables, for example
DEFAULTGATEWAY=172.16.19.1
Bit Number Hexadecimal Meaning
Configuration Register Settings
Nvram
Changing Configuration Register Settings
Configuring the Boot Field
Boot Field Meaning
Bit Address net host
Enabling Booting from Flash Memory
Baud Bit
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Numerics
IN-1
Dram
IN-2
Isdn BRI
LAN
Link LED
IN-3
Sdram
IN-4
IN-5
IN-6