Recovering Cisco IOS Software Images | Cisco Systems AIRCAP3602IAK9

Appendix B Using the ROM Monitor

Recovering Cisco IOS Software Images

Recovering Cisco IOS Software Images

If both the boot and system images have been erased and only the ROM monitor is available, you can use the ROM monitor xmodem command to copy a Cisco IOS image to Flash memory from the console. The console can be connected directly to the router through the console port, or remotely through a modem connected to the auxiliary port.

Note Copying a Cisco IOS image from the 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.

Note Using a PCMCIA card to update the Cisco IOS image is much faster than using the console port and, when available, is the recommended method of recovering a software image.

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

Cisco 3600 Series Routers Hardware Installation Guide

	OL-2056-05	B-9

Image 133

Cisco Systems AIRCAP3602IAK9 manual Recovering Cisco IOS Software Images, Description and Options of the xmodem Command

Contents

Corporate Headquarters Cisco 3600 Series Routers Hardware Installation Guide Cisco 3600 Series Routers Hardware Installation Guide N T E N T S Creating a Site Log Connecting Routers to the Cisco Redundant Power System Troubleshooting A-1 Objectives Preface 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 GEM Disse Anvisninger Xiii Related Documentation Cisco Product Document Title Duration of Hardware Warranty Cisco 90-Day Limited Hardware Warranty TermsReplacement, Repair, or Refund Policy for Hardware Obtaining Documentation To Receive a Return Materials Authorization RMA NumberCisco.com Documentation CD-ROM Obtaining Technical Assistance Documentation FeedbackOrdering Documentation Cisco TAC Website TAC Case Priority Definitions Opening a TAC Case Obtaining Additional Publications and Information Overview of Cisco 3600 Series Routers Hardware Features Cisco Front Panel of the Cisco 3640 Router Front Panel of the Cisco 3660 Router Cisco 3662 Router with Two Fast Ethernet Interfaces Modules and Interface Cards Memory Specifications Memory Installation DocumentationDescription Specification Memory 55 KB Cisco 3620 and Cisco 3640 Interfaces Interface NumberingSlot Numbering Unit Numbering Voice Interface Numbering Cisco 3631 InterfacesWAN and LAN Interface Numbering Interface Numbering-Example Cisco 3660 Slot Numbers Cisco 3660 Interfaces Regulatory Compliance and Safety Information document that System Specifications Cisco 3631 Router System Specifications Cisco 3640 Router System Specifications Regulatory Compliance OL-2056-05 Safety with Electricity Safety Recommendations Preventing Electrostatic Discharge Damage General Site Requirements Power Supply Considerations Site Environment Site Configuration Equipment Racks Task Verified by Date Installation Checklist Inspecting the Router Creating a Site Log Tools and Equipment for Installation and Maintenance Console Port Connections Console and Auxiliary Port ConsiderationsAuxiliary Port Connections Ethernet Connections Preparing to Connect to a Network Token Ring Connections Configuring Serial ConnectionsSerial Connections Serial DTE or DCE Devices Distance Limitations Signaling Standards SupportedDevice Type Gender Typical Devices 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 Installing the Router Installing Modules, Interface Cards, and Power Supplies Setting the Chassis on a Desktop Installing the ChassisRack-Mounting the Chassis Right Cisco 3640 Rack-Mount Brackets Attaching Brackets to the Router Front-Panel-Forward Installation Use two screws on each side 17327 Rear-Panel-Forward Installation Four screws are required on each side 82808 Center-Mount Installation 22 Cisco 3660 Center-Mount Bracket Attachment Mounting the Router in the Rack Inch rack 24-inch rack 26 Mounting the Cisco 3631 Router 19-Inch Rack 28 Mounting the Cisco 3660 Router 19-Inch Rack Attaching Rubber Feet to the Router Wall-Mounting the Cisco 3620 RouterAttaching Wall-Mount Brackets to the Router Mounting the Router on the Wall Cisco 3620 and Cisco 3640 Chassis Ground Connection Installing Chassis Ground Connection Mounting Screws Power supply Bracket NEBS-Compliant Ground Lug Attachment on a Cisco 3640 Router Ring terminal attached to a bracket Power supply Ring terminal Ground lug attachment Cisco 3631 Chassis Ground Connection Cisco 3660 Chassis Ground Connection 103013 Connecting Routers to AC Power Power ConnectionsConnecting Routers to a DC-Input Power Supply 15A, 120VAC 10A, 240VAC. Statement DC Input DC Input Wire Size DC Wiring Requirements 43 DC Power Connections for Cisco 3620 Routers Typical DC Input Wiring the DC-Input Power Supply in Cisco 3631 RoutersOvercurrent 45 DC Power Connections for -DC Input to Cisco 3631 Routers 47 Wire Routing and Attachment for Cisco 3631 Routers Wiring the DC-Input Power Supply in Cisco 3660 Routers DC Input Wire Size Method Protection Wire Termination Safety Ground Overcurrent Return Safety ground Wire management bracket Connecting Routers to the Cisco Redundant Power System Ports and Cabling Connecting WAN, LAN, and Voice Cables T1/E1 WAN Port or Connection Port type, color Connected to Cable Connections for Cisco 3660 Routers Connecting WAN, LAN, and Voice Cables Without Chassis Shield LAN, WAN, and voice cables Power wires 54 Removing Panels from Chassis Shield 55 Cables Routed Through Openings in the Chassis Shield 56 Cables Routed Through the Chassis Cutout Connecting to a Console Terminal or Modem 57 Connecting a Console Terminal to a Cisco 3620 Router Connecting to the Console Port 58 Connecting a Console Terminal to a Cisco 3631 Router 60 Connecting a Console Terminal to a Cisco 3660 Router Connecting to the Auxiliary Port Modem Modem cable AUX port Connector RJ-45 RJ-45-to-RJ-45 rollover cable 65 Identifying a Rollover Cable Identifying a Rollover Cable Checklist for Power Up Powering Up the RouterFront Panel Indicators Cisco 3620 series and Cisco 3640 series Power-Up Procedure Initial Configuration Using SDM Configuring the Router Initial Configuration Using the Setup Command Facility Summary of the available interfaces is displayed User prompt appears Enter privileged Exec mode Initial Configuration Using the CLI Manual Configuration OL-2056-05 Isolating Problems Troubleshooting Troubleshooting the Power and Cooling Systems Troubleshooting Modules, Cables, and Connections Environmental Reporting Features Figure A-1 Cisco 3620 Router Front-Panel LEDs Reading Front-Panel LEDs Figure A-2 Cisco 3640 Router Front-Panel LEDs Color Description Color Power Supply StatusColor RPS Status LED Front-Panel LEDs on Cisco 3631 Routers Rear-Panel LEDs on Cisco 3631 Routers Reading Rear-Panel LEDsColor Status System Rear-Panel LEDs on Cisco 3660 Routers Cisco 3600 Series Error Messages Error Messages Message LED Type LED Color Message Cisco 3660 Error Messages Fan Cage in Cisco 3660 Routers hardware configuration note Cisco 3600 Series Routers hardware configuration note PS1, PS2 Amber Recovering a Lost Password Entering ROM Monitor Mode Using the ROM Monitor Enter ROM Monitor Mode by Using the reload Command ROM Monitor Commands ROM Monitor Syntax Conventions Command abc Router Management Commands ROM Monitor Command DescriptionsBoot Commands in the ROM Monitor Entering Boot Commands Other Useful ROM Monitor Commands Informational Commands in the ROM Monitor Configuration Register Commands Debugging Commands Modifying the Configuration Register in Menu Mode Description and Options of the xmodem Command Recovering Cisco IOS Software ImagesConsole Requirements Procedure for the xmodem Command Configuration Register Settings Configuration Register Bit Number Hexadecimal Meaning Changing Configuration Register Settings Router# config-register 0xvalue Boot Field Meaning Configuring the Boot Field Baud Bit Bit Address net host Router# configure Enabling Booting from Flash Memory Symbols IN-2 IN-3 IN-4 IN-5 IN-6