Description and Options of the xmodem Command | Cisco Systems 2600

Appendix B Using the ROM Monitor

Recovering Cisco IOS Software Images

Note The tftpdnld command is not available on the Cisco 2691 router. The recommended method for installing a Cisco IOS image on a Cisco 2691 router is from a CompactFlash memory card loaded in the external CompactFlash memory card slot. See the “Entering Boot Commands” procedure on page B-4.

Copying an Image from the Console Using the xmodem Command

Description and Options of the xmodem Command

The xmodem command establishes a connection between a console and the router console port for disaster recovery, if both the boot and system images are erased from flash memory.

xmodem [filename]—Establishes an Xmodem connection between the console and the router. The optional argument filename specifies the source file containing the Cisco IOS image.

Other options include the following:

•c—Use cyclic redundancy check (CRC-16).

•y—Use Ymodem transfer protocol.

•r—Copy the image to dynamic random-access memory (DRAM) for launch.

•x—Do not launch image on completion of download.

Console Requirements

The console computer (PC) must have the following files to use this procedure:

•Terminal emulation application program supporting one of the following file transfer protocols:

–Xmodem

–Xmodem–CRC

–Xmodem–1K

–Ymodem

•Cisco IOS image file

Procedure for the xmodem Command

To copy a Cisco IOS image from a console to flash memory, perform the following procedure.

Note File transfer from a console is slow and will take many minutes.

Step 1 Connect a console to the router’s console port using the instructions in the “Connecting to a Console Terminal or Modem” section on page 3-20.

Step 2 Power up the router. The power-on self-test diagnostics run and the boot ROM searches for a valid boot image and Cisco IOS image in flash memory. If the boot image and Cisco IOS image are not found, the ROM monitor prompt is displayed:

rommon 1>

Cisco 2600 Series Routers Hardware Installation Guide

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Cisco Systems 2600 manual Copying an Image from the Console Using the xmodem Command, Console Requirements

Contents

Corporate Headquarters Cisco 2600 Series Routers Hardware Installation Guide Cisco 2600 Series Routers Hardware Installation Guide Iii N T E N T S Serial DTE or DCE Devices Initial Configuration Using the Setup Command Facility Procedure for the tftpdnld Command Configuration Register Vii Objectives Organization AudienceConventions Chapter Title Description Bewaar Deze Instructies Safety Warnings Avvertenza Importanti Istruzioni Sulla Sicurezza Warnung Wichtige Sicherheitshinweise Guarde Estas Instruções Aviso Instruções Importantes DE Segurança Xii GEM Disse Anvisninger Xiii Xiv Related Documentation Cisco Product Document Title Duration of Hardware Warranty Cisco 90-Day Limited Hardware Warranty TermsReplacement, Repair, or Refund Policy for Hardware Xvi Documentation Feedback Obtaining DocumentationCisco.com Ordering Documentation Obtaining Technical Assistance Submitting a Service RequestCisco Technical Support Website Xviii Xix Definitions of Service Request SeverityObtaining Additional Publications and Information Preface Obtaining Additional Publications and Information Overview of Cisco 2600 Series Routers Hardware Features Cisco Advanced Reading the Front-Panel LEDs Power Activity RPSPWR SYS/RPS ACT Reading the Rear-Panel LEDs Cisco 2613-Rear-Panel LEDs FDX LinkACT CF1 Modules, Interface Cards, and Memory WAN and LAN Interface Numbering Interface Numbering 11 Interface Numbering in Chassis with 1-RU Height Voice Interface Numbering System SpecificationsDescription Specification Regulatory Compliance Safety with Electricity Safety Recommendations Preventing Electrostatic Discharge Damage Power Source Input Power Tolerance Limits Power Supply ConsiderationsGeneral Site Requirements Site Environment Equipment Racks Installation ChecklistSite Configuration Task Verified by Date Creating a Site Log Inspecting the Router Tools and Equipment for Installation and Maintenance Console Port Connections Console and Auxiliary Port Considerations Auxiliary Port Connections Preparing to Connect to a Network Token Ring Connections Ethernet Connections Serial DTE or DCE Devices Configuring Serial ConnectionsSerial Connections Device Type Gender Typical Devices Signaling Standards SupportedDistance Limitations Asynchronous/Synchronous Serial Module Baud Rates Isdn BRI ConnectionsEIA/TIA-232 Distance EIA-530 Distance Rate bps Feet Meters Low-Capacitance Cable 56-K/Switched-56-kbps DSU/CSU Connections OL-2171-06 Installing the Router For network modules Installing Modules, Interface Cards, and Power SuppliesFor WICs and VICs For AIMs Setting the Chassis on a Desktop Setting Up the ChassisFor 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 Use two screws on each side For 19-inch rack Right bracket Attaching the Brackets to a Router of 2-RU Height V0 EN Installing the Router in a Rack Attaching Wall-Mount Brackets to the Router Mounting the Chassis on the WallAttaching Rubber Feet to the Router 16 Attaching the Wall-Mount Brackets Mounting the Router on the Wall 17 Mounting the Chassis on the Wall Installing the Chassis Ground Connection Ring terminal Connecting Routers to AC Power Power Connections DC Wiring Requirements Connecting Routers to a DC-Input Power SupplyRouter DC Input DC Input Wire Size1 15A, 120VAC 10A, 240VAC. Statement Wiring Procedure for DC Input Connecting Routers to the Cisco Redundant Power System Connecting WAN, LAN, and Voice CablesPorts and Cabling Port or Connection Port Type, Color Connected To Cable LAN, WAN, and Voice Connection Procedures Connecting to the Console Port Connecting to a Console Terminal or Modem 23 Connecting to a Console Terminal Connecting to the Auxiliary Port Identifying a Rollover Cable 24 Connecting a Modem to the Auxiliary Port Checklist for Power Up Powering Up the RouterFront Panel Indicators Routers with 1-RU Chassis Height Routers with 2-RU Chassis Height Power-Up Procedure Configuring the Router Initial Configuration Using the Setup Command Facility Initial Configuration Using SDM Enter a hostname for the router this example uses Configuration is displayed Initial Configuration Using the CLI Manual Configuration To proceed with manual configuration using the CLI, enter no OL-2171-06 Isolating Problems Troubleshooting Environmental Reporting Features Troubleshooting the Power and Cooling Systems Troubleshooting Modules, Cables, and Connections Cisco Technical Assistance Center Recovering a Lost PasswordSystem Messages Entering ROM Monitor Mode Using the ROM Monitor Enter ROM Monitor Mode by Using the reload Command ROM Monitor Commands Command abc ROM Monitor Command Syntax Conventions Boot Commands in the ROM Monitor ROM Monitor Command DescriptionsRouter Management Commands Informational Commands in the ROM Monitor Other Useful ROM Monitor Commands Debugging Commands Modifying the Configuration Register in Menu Mode Configuration Register Commands Modifying the Configuration Register by Hexidecimal Entry Recovering Cisco IOS Software Images Description and Options of the xmodem Command Copying an Image from the Console Using the xmodem CommandProcedure for the xmodem Command Console Requirements Restrictions on the tftpdnld Command Specify the required variables, for example Procedure for the tftpdnld Command DEFAULTGATEWAY=172.16.19.1 Nvram Configuration Register SettingsBit Number Hexadecimal Meaning Changing Configuration Register Settings Boot Field Meaning Configuring the Boot Field Bit Address net host Baud Bit Enabling Booting from Flash Memory OL-2171-06 IN-1 Numerics IN-2 Dram LAN Isdn BRILink LED IN-3 IN-4 Sdram IN-5 IN-6