Enabling Booting from Flash Memory | Cisco Systems Cisco 3600

Appendix C Configuration Register

Enabling Booting from Flash Memory

Enabling Booting from Flash Memory

To enable booting from Flash memory, set bits 3, 2, 1, and 0 to a value between 2 to 15. To specify a filename to boot, enter the system software configuration command boot system flash [device:] [partition:] [filename] in the configuration file.

By specifying the device and partition in the command, you can configure the router to boot from the PCMCIA cards. If you specify only the filename, the router is configured to boot from Flash memory.

To enter configuration mode while in the system software image, enter the configure command at the enable prompt as in the following example:

Router# configure

Configuring from terminal, memory, or network [terminal]? terminal

Enter configuration commands, one per line.

Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z boot system flash filename

To disable Break and enable the boot system flash command, enter the config-registercommand with a value as follows:

config-reg 0x102

Ctrl-z

If you set the configuration register value to 0x102, as in this example, you do not need to enter the boot system flash command unless there is more than one image in Flash memory.

Cisco 3600 Series Routers Hardware Installation Guide

	C-6	OL-2056-05

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Cisco Systems Cisco 3600 manual Enabling Booting from Flash Memory, Router# configure

Contents

Cisco 3600 Series Routers Hardware Installation Guide Corporate Headquarters 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 Preface Objectives Audience OrganizationConventions 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 Xiii Related Documentation Cisco Product Document Title Replacement, Repair, or Refund Policy for Hardware Cisco 90-Day Limited Hardware Warranty TermsDuration of Hardware Warranty To Receive a Return Materials Authorization RMA Number Obtaining DocumentationCisco.com Documentation CD-ROM Documentation Feedback Obtaining Technical AssistanceOrdering Documentation Cisco TAC Website Opening a TAC Case TAC Case Priority Definitions Obtaining Additional Publications and Information Hardware Features Overview of Cisco 3600 Series Routers Cisco Front Panel of the Cisco 3640 Router Front Panel of the Cisco 3660 Router Modules and Interface Cards Cisco 3662 Router with Two Fast Ethernet Interfaces Memory Installation Documentation Memory SpecificationsDescription Specification Memory 55 KB Interface Numbering Cisco 3620 and Cisco 3640 InterfacesSlot Numbering Unit Numbering WAN and LAN Interface Numbering Cisco 3631 InterfacesVoice Interface Numbering Interface Numbering-Example Cisco 3660 Interfaces Cisco 3660 Slot Numbers System Specifications Regulatory Compliance and Safety Information document that Cisco 3631 Router System Specifications Cisco 3640 Router System Specifications Regulatory Compliance OL-2056-05 Safety Recommendations Safety with Electricity Preventing Electrostatic Discharge Damage Power Supply Considerations General Site Requirements Site Configuration Site Environment Equipment Racks Installation Checklist Task Verified by Date Creating a Site Log Inspecting the Router Tools and Equipment for Installation and Maintenance Auxiliary Port Connections Console and Auxiliary Port ConsiderationsConsole Port Connections Preparing to Connect to a Network Ethernet Connections Configuring Serial Connections Token Ring ConnectionsSerial Connections Serial DTE or DCE Devices Device Type Gender Typical Devices Signaling Standards SupportedDistance Limitations Isdn BRI Connections Asynchronous/Synchronous Serial Module Baud RatesEIA/TIA-232 Distance EIA-530 Distance Rate bps Feet Meters 56-K/Switched-56-kbps DSU/CSU Connections Low-Capacitance Cable Installing the Router Installing Modules, Interface Cards, and Power Supplies Rack-Mounting the Chassis Installing the ChassisSetting the Chassis on a Desktop Right Attaching Brackets to the Router Cisco 3640 Rack-Mount Brackets 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 Wall-Mounting the Cisco 3620 Router Attaching Rubber Feet to the RouterAttaching Wall-Mount Brackets to the Router Mounting the Router on the Wall Installing Chassis Ground Connection Cisco 3620 and Cisco 3640 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 Cisco 3631 Chassis Ground Connection Ground lug attachment Cisco 3660 Chassis Ground Connection 103013 Power Connections Connecting Routers to AC PowerConnecting Routers to a DC-Input Power Supply 15A, 120VAC 10A, 240VAC. Statement DC Wiring Requirements DC Input DC Input Wire Size 43 DC Power Connections for Cisco 3620 Routers Typical Overcurrent Wiring the DC-Input Power Supply in Cisco 3631 RoutersDC Input 45 DC Power Connections for -DC Input to Cisco 3631 Routers Wiring the DC-Input Power Supply in Cisco 3660 Routers 47 Wire Routing and Attachment for Cisco 3631 Routers Wire Termination Safety Ground Overcurrent DC Input Wire Size Method Protection Return Safety ground Wire management bracket Connecting Routers to the Cisco Redundant Power System Connecting WAN, LAN, and Voice Cables Ports and Cabling Port or Connection Port type, color Connected to Cable T1/E1 WAN Connecting WAN, LAN, and Voice Cables Without Chassis Shield Connections for Cisco 3660 Routers LAN, WAN, and voice cables Power wires 54 Removing Panels from Chassis Shield 55 Cables Routed Through Openings in the Chassis Shield Connecting to a Console Terminal or Modem 56 Cables Routed Through the Chassis Cutout Connecting to the Console Port 57 Connecting a Console Terminal to a Cisco 3620 Router 58 Connecting a Console Terminal to a Cisco 3631 Router Connecting to the Auxiliary Port 60 Connecting a Console Terminal to a Cisco 3660 Router Modem Modem cable AUX port Connector RJ-45 RJ-45-to-RJ-45 rollover cable Identifying a Rollover Cable 65 Identifying a Rollover Cable Front Panel Indicators Powering Up the RouterChecklist for Power Up Power-Up Procedure Cisco 3620 series and Cisco 3640 series Configuring the Router Initial Configuration Using SDM Initial Configuration Using the Setup Command Facility Summary of the available interfaces is displayed User prompt appears Initial Configuration Using the CLI Manual Configuration Enter privileged Exec mode OL-2056-05 Troubleshooting Isolating Problems Troubleshooting the Power and Cooling Systems Environmental Reporting Features Troubleshooting Modules, Cables, and Connections Reading Front-Panel LEDs Figure A-1 Cisco 3620 Router Front-Panel LEDs Figure A-2 Cisco 3640 Router Front-Panel LEDs Color RPS Status Color Power Supply StatusColor Description Front-Panel LEDs on Cisco 3631 Routers LED Color Status Reading Rear-Panel LEDsRear-Panel LEDs on Cisco 3631 Routers Rear-Panel LEDs on Cisco 3660 Routers System Error Messages Cisco 3600 Series Error Messages Message Cisco 3660 Error Messages LED Type LED Color Message Fan Cage in Cisco 3660 Routers hardware configuration note Cisco 3600 Series Routers hardware configuration note PS1, PS2 Amber Recovering a Lost Password Using the ROM Monitor Entering ROM Monitor Mode ROM Monitor Commands Enter ROM Monitor Mode by Using the reload Command Command abc ROM Monitor Syntax Conventions Boot Commands in the ROM Monitor ROM Monitor Command DescriptionsRouter Management Commands Entering Boot Commands Informational Commands in the ROM Monitor Other Useful ROM Monitor Commands Debugging Commands Configuration Register Commands Modifying the Configuration Register in Menu Mode Console Requirements Recovering Cisco IOS Software ImagesDescription and Options of the xmodem Command Procedure for the xmodem Command Configuration Register Configuration Register Settings Changing Configuration Register Settings Bit Number Hexadecimal Meaning Router# config-register 0xvalue Configuring the Boot Field Boot Field Meaning Bit Address net host Baud Bit Enabling Booting from Flash Memory Router# configure Symbols IN-2 IN-3 IN-4 IN-5 IN-6