Appendix B Using the ROM Monitor
ROM Monitor Command Descriptions
ROM Monitor Command Descriptions
Router Management Commands
This section lists some useful ROM monitor commands. Refer to the Cisco IOS configuration guides and command references for more information on ROM monitor commands.
Boot Commands in the ROM Monitor
Functions of Boot Commands
The router always boots first from a Cisco IOS image in flash memory, because there is no separate, dedicated boothelper image ([rx]boot). The first image in flash memory functions as the boothelper image, but you can override this by setting the BOOTLDR Monitor environment variable to point to another image. If the ROM monitor does not recognize a device ID specified in the boot command (device does not exist, or command entered incorrectly), the router boots from the first image in flash memory.
To boot a router from a Cisco IOS image on a TFTP server (netboot), the installed DRAM must be adequate to hold two uncompressed Cisco IOS images: the image from flash memory and the image downloaded from the TFTP server.
If the router is configured to boot from a TFTP server (boot bits in the configuration register are set from 2 to 15), the router first boots from the image in flash memory. It decompresses that image in DRAM, parses the boot system commands, downloads the Cisco IOS image from the TFTP server, and decompresses it in DRAM. After the Cisco IOS image from the TFTP server is in DRAM, the DRAM memory occupied by the boothelper image is released.
Note Booting from a TFTP server is useful if the router does not have enough flash memory to hold large images. With a small image in flash memory (just large enough to support the necessary interfaces), the router boots from flash memory, and then the larger image is downloaded from the TFTP server.
Entering Boot Commands
The boot command syntax is as follows, where:
•partition is a partition number in the flash memory.
•filename is the Cisco IOS image filename.
•tftpserver is the IP address of the TFTP server.
•-xdirects the router to load the image but not execute the boot process.
•-v(verbose) specifies that progress print setting messages and error information be displayed.
boot [flash: [partition: [filename]] slot0: [partition: [filename]] slot1: [partition: [filename]] filename tftpserver] [-x][-v]
Some examples of boot commands are as follows:
Note In all boot commands, boot can be entered as b.
Cisco 2600 Series Routers Hardware Installation Guide
Cisco 2600 Series Routers Hardware Installation Guide
Corporate Headquarters
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
Definitions of Service Request Severity
Obtaining Additional Publications and Information
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
Link
ACT
FDX
Modules, Interface Cards, and Memory
CF1
Interface Numbering
WAN and LAN Interface Numbering
11 Interface Numbering in Chassis with 1-RU Height
System Specifications
Description Specification
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
Installation Checklist
Site Configuration
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
Configuring Serial Connections
Serial Connections
Serial DTE or DCE Devices
Signaling Standards Supported
Distance Limitations
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
Mounting the Chassis on the Wall
Attaching Rubber Feet to the Router
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
Recovering a Lost Password
System Messages
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
ROM Monitor Command Descriptions
Router Management Commands
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
Configuration Register Settings
Bit Number Hexadecimal Meaning
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