Cisco Systems 3700 Series manual Recovering Cisco IOS Software Images, Console Requirements

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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 software image to CompactFlash 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 software image from the console is very slow. This procedure should be used only in an emergency and is not recommended for normal Cisco IOS software image upgrades.

For the fastest possible download from a console, set the console speed to 115200 bps by using the ROM monitor confreg command. See the “Configuration Register” procedure on page B-6.

Note Using a CompactFlash memory card to update the Cisco IOS software 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 CompactFlash 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 software image.

Other options include the following:

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

•y—Uses Ymodem transfer protocol.

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

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

Console Requirements

The console 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 software image file

Cisco 3700 Series Routers Hardware Installation Guide

 

B-8

OL-2180-08

 

 

 

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Contents Cisco 3700 Series Routers Hardware Installation Guide Corporate HeadquartersBook Title N T E N T S Site Environment Entering ROM Monitor Mode B-1 Cisco 3700 Series Routers Hardware Installation Guide Preface ObjectivesAudience OrganizationConventions Chapter Title DescriptionSafety Warnings Bewaar Deze InstructiesWarnung Wichtige Sicherheitshinweise Avvertenza Importanti Istruzioni Sulla SicurezzaAviso Instruções Importantes DE Segurança Guarde Estas InstruçõesGEM Disse Anvisninger Xiii Related Documentation Cisco Product Document Title Obtaining Documentation Documentation FeedbackCisco.com Ordering DocumentationObtaining Technical Assistance Submitting a Service RequestCisco Technical Support Website Definitions of Service Request Severity Obtaining Additional Publications and InformationXix OL-2180-08 Hardware Features Cisco1shows the rear panel of the Cisco 3725 router Modules, Interface Cards, and Memory 2shows the rear panel of the Cisco 3745 routerDescription Specification MemoryCisco 3725 Interfaces Interface NumberingWAN and LAN Interface Numbering Voice Interface Numbering Gigabit Ethernet 2/0Cisco 3745 Interfaces Network-module-slot/voice-module-slot/voice-interface Internal -48 V Telephony Power Modules Power Supply OptionsPower Supply Option Cisco Cisco 3725 Router with Optional -48 V Power Module Installed System Specifications Regulatory Compliance Preparing to Install the Router Safety RecommendationsSafety with Electricity Preventing Electrostatic Discharge DamageRouter Power Supply Input Power Input Voltage Power Supply ConsiderationsGeneral Site Requirements Site Environment Site ConfigurationEquipment Racks Installation Checklist Task Verified by DateCreating a Site Log Inspecting the RouterPage Console Port Connections Console and Auxiliary Port ConsiderationsAuxiliary Port Connections Preparing to Connect to a Network Ethernet ConnectionsConfiguring Serial Connections Token Ring ConnectionsSerial Connections Serial DTE or DCE DevicesDistance Limitations Signaling Standards SupportedDevice Type Gender Typical Devices Isdn BRI Connections Asynchronous/Synchronous Serial Module Data RatesEIA/TIA-232 Distance EIA-530 Distance Rate bps Feet Meters56-K/Switched-56-kbps DSU/CSU Connections Low-Capacitance CableOL-2180-07 Installing the Router Setting Up the Chassis Setting the Chassis on a DesktopLeft Rack-Mounting the ChassisAttaching Brackets to the Cisco 3725 Router Cisco 3745 Router-Brackets for 19-Inch RackRight wide bracket Attaching Brackets to the Cisco 3745 Router RightMounting the Router in a Rack 63387Installing the Chassis Ground Connection 11 Mounting the Chassis in a Rack TypicalCisco 3725 Router Ground Connection Ground lugCisco 3745 Router Ground Connection Power Connections Installing the Router Power ConnectionsConnecting Routers to AC Power Connecting Routers to a DC-Input Power SupplyWiring the DC-Input Power Supply in Cisco 3725 Routers 15A, 120VAC 10A, 240VAC. StatementDC Power DC Input Source DC Input Wire Size Wire Terminal Lug Protection+ B 17 DC Wire Routing and Attachment for Cisco 127039 Wiring the DC-Input Power Supply in Cisco 3745 Routers DC Input Wire Installed Power Supply DC Input Size Wire SizeNegative polarity input 0V return Safety ground Connecting Routers to the Cisco Redundant Power System Connecting WAN, LAN, and Voice CablesPorts and Cabling Connection Procedures and Precautions Port or Connection Port type, color CableConnecting to a Console Terminal or Modem Connecting to the Console Port24 Connecting a Console Terminal to a Cisco 3725 Router Connecting to the Auxiliary Port Specifications on Cisco.comIdentifying a Rollover Cable 28 Identifying a Rollover CableChecklist for Power Up Powering Up the RouterFront Panel Indicators Power-Up Procedure Cisco 3745 LED IndicatorsYourname con0 is now available Press Return to get started Initial Configuration Using SDM Configuring the RouterInitial Configuration Using the Setup Command Facility Shown as examples only Configuration is displayed Initial Configuration Using the CLI Manual Configuration Press Return to bring up the Router prompt OL-2180-08 Troubleshooting Solving Problems Troubleshooting the Power and Cooling SystemsEnvironmental Reporting Features Troubleshooting Modules, Cables, and ConnectionsReading Front-Panel LEDs ACT LED SYS/RPS LED PWR LEDLED Indicator State Description SYS/RPSReading Rear Panel LEDs SYS PS1Power Error Messages ETMSystem Amber Error LED Type LED Color MessagePS1, PS2 Amber Error LED on PS1, PS2 Amber Recovering a Lost Password Using the ROM Monitor Entering ROM Monitor ModeROM Monitor Commands Enter ROM Monitor Mode by Using the reload CommandBoot Commands in the ROM Monitor ROM Monitor Command DescriptionsROM Monitor Syntax Conventions Cisco 3700 Series Routers Hardware Installation Guide Informational Commands in the ROM Monitor Debugging Commands in the ROM Monitor Other Useful ROM Monitor CommandsConfiguration Register Modifying the Configuration Register in Menu Mode Modifying the Configuration Register by Hexadecimal EntryDescription and Options of the xmodem Command Recovering Cisco IOS Software ImagesConsole Requirements Procedure for the xmodem Command Messages similar to the following appearOL-2180-08 Configuration Register Settings Bit Number Hexadecimal MeaningChanging Configuration Register Settings Your router is now in the normal operating modeConfiguring the Boot Field Boot Field MeaningBit Address net host Enabling Booting from CompactFlash Memory Data Rate BitOL-2180-08 Symbols IN-2 IN-3 IN-4 IN-5 IN-6

3700 Series specifications

Cisco Systems 3700 Series routers are a pivotal part of Cisco's portfolio, designed for medium to large enterprises aiming to deliver secure and efficient networking capabilities. Introduced as a versatile solution, these routers provide a comprehensive blend of performance, scalability, and investment protection.

One of the standout features of the Cisco 3700 Series is its modular architecture, allowing organizations to customize their router according to specific needs. This modularity supports various modules for different functions, including voice, data, and video, making the 3700 Series an ideal choice for converged networking environments. Administrators can enhance functionality through an array of WAN and voice interface cards that adapt as the organization's needs evolve.

The 3700 Series is built on Cisco's IOS (Internetwork Operating System), ensuring robust and high-quality performance. It supports advanced routing protocols including EIGRP, OSPF, and BGP, facilitating efficient data transmission across diverse environments. This versatility helps organizations implement sophisticated multi-site connectivity and enables reliable performance in complex network scenarios.

Security is a paramount concern in modern networking, and the Cisco 3700 Series delivers with features such as integrated firewall services, VPN support, and intrusion detection capabilities. These security measures protect sensitive data and ensure secure communication between remote sites—critical in today’s cyber landscape.

Another key characteristic of the 3700 Series is its support for Quality of Service (QoS), which prioritizes time-sensitive traffic such as voice and video. By ensuring that critical applications receive the bandwidth they require, organizations can maintain the quality of service that their users expect.

Moreover, the Cisco 3700 Series is designed with redundancy in mind. Features like dual power supplies and hot-swappable fan trays enhance reliability and uptime, which are crucial for mission-critical applications.

Furthermore, energy efficiency is an increasingly important consideration in network design. The Cisco 3700 Series adheres to modern energy standards, helping reduce the overall carbon footprint while supporting high-performance capabilities.

In summary, the Cisco Systems 3700 Series routers stand out for their modularity, advanced routing capabilities, robust security features, and energy efficiency, making them an optimal choice for enterprises that not only need performance but also flexibility and reliability in their networking solutions. As businesses continue to evolve and adapt, the Cisco 3700 Series is a dependable partner in their connectivity journey, ensuring they can meet current demands while preparing for future challenges.
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