Cisco Systems 3700 Series manual Using the ROM Monitor, Entering ROM Monitor Mode

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A P P E N D I X B

Using the ROM Monitor

This appendix describes the ROM monitor (also called the bootstrap program), the firmware that runs when your Cisco 3700 series router is powered up or reset. During normal operation, the ROM monitor helps to initialize the processor hardware and boot the operating system software. You can also use the ROM monitor to isolate or eliminate hardware problems and recover a corrupted Cisco IOS software image.

This appendix includes the following sections:

•Entering ROM Monitor Mode, page B-1

•ROM Monitor Commands, page B-2

•ROM Monitor Syntax Conventions, page B-3

•ROM Monitor Command Descriptions, page B-3

•Recovering Cisco IOS Software Images, page B-8

Entering ROM Monitor Mode

To use the ROM monitor, you must have access to the console port. See the “Connecting to a Console Terminal or Modem” section on page 3-22for information on connecting the console cable.

There are two ways of entering the ROM monitor mode:

•Use the reload command and the Break key to enter the ROM monitor mode for one-time use.

Break (system interrupt) is always enabled for 60 seconds after the router reboots, regardless of whether Break is configured on or off in the configuration register (see Appendix C, “Configuration Register”). During this 60-second period, you can break to the ROM monitor prompt by pressing the Break key.

Note If your console terminal does not have a Break key, see the terminal emulator documentation for instructions on generating a break (system interrupt).

•Set the configuration register so that the router enters the ROM monitor mode whenever it boots.

The new configuration register value, 0x0, is effective after the router is rebooted with the reload command. The router remains in the ROM monitor and does not boot the operating system.

As long as the configuration register value remains 0x0, you must manually boot the operating system from the console. See the boot command in the “ROM Monitor Command Descriptions” section on page B-3.

Cisco 3700 Series Routers Hardware Installation Guide

 

OL-2180-08

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Contents Corporate Headquarters Cisco 3700 Series Routers Hardware Installation GuideBook Title N T E N T S Site Environment Entering ROM Monitor Mode B-1 Cisco 3700 Series Routers Hardware Installation Guide Objectives PrefaceOrganization AudienceConventions Chapter Title DescriptionBewaar Deze Instructies Safety WarningsAvvertenza Importanti Istruzioni Sulla Sicurezza Warnung Wichtige SicherheitshinweiseGuarde Estas Instruções Aviso Instruções Importantes DE SegurançaGEM Disse Anvisninger Xiii Related Documentation Cisco Product Document Title Documentation Feedback Obtaining DocumentationCisco.com Ordering DocumentationSubmitting a Service Request Obtaining Technical AssistanceCisco Technical Support Website Obtaining Additional Publications and Information Definitions of Service Request SeverityXix OL-2180-08 Cisco Hardware Features1shows the rear panel of the Cisco 3725 router 2shows the rear panel of the Cisco 3745 router Modules, Interface Cards, and MemoryMemory Description SpecificationInterface Numbering Cisco 3725 InterfacesWAN and LAN Interface Numbering Gigabit Ethernet 2/0 Voice Interface NumberingCisco 3745 Interfaces Network-module-slot/voice-module-slot/voice-interface Power Supply Options Internal -48 V Telephony Power ModulesPower Supply Option Cisco Cisco 3725 Router with Optional -48 V Power Module Installed System Specifications Regulatory Compliance Safety Recommendations Preparing to Install the RouterPreventing Electrostatic Discharge Damage Safety with ElectricityPower Supply Considerations Router Power Supply Input Power Input VoltageGeneral Site Requirements Site Configuration Site EnvironmentEquipment Racks Task Verified by Date Installation ChecklistInspecting the Router Creating a Site LogPage Console and Auxiliary Port Considerations Console Port ConnectionsAuxiliary Port Connections Ethernet Connections Preparing to Connect to a NetworkToken Ring Connections Configuring Serial ConnectionsSerial Connections Serial DTE or DCE DevicesSignaling Standards Supported Distance LimitationsDevice Type Gender Typical Devices Asynchronous/Synchronous Serial Module Data Rates Isdn BRI ConnectionsEIA/TIA-232 Distance EIA-530 Distance Rate bps Feet MetersLow-Capacitance Cable 56-K/Switched-56-kbps DSU/CSU ConnectionsOL-2180-07 Installing the Router Setting the Chassis on a Desktop Setting Up the ChassisRack-Mounting the Chassis LeftCisco 3745 Router-Brackets for 19-Inch Rack Attaching Brackets to the Cisco 3725 RouterRight wide bracket Right Attaching Brackets to the Cisco 3745 Router63387 Mounting the Router in a Rack11 Mounting the Chassis in a Rack Typical Installing the Chassis Ground ConnectionGround lug Cisco 3725 Router Ground ConnectionCisco 3745 Router Ground Connection Installing the Router Power Connections Power ConnectionsConnecting Routers to a DC-Input Power Supply Connecting Routers to AC PowerWiring the DC-Input Power Supply in Cisco 3725 Routers 15A, 120VAC 10A, 240VAC. StatementSource DC Input Wire Size Wire Terminal Lug Protection DC Power DC Input+ B 17 DC Wire Routing and Attachment for Cisco 127039 Wiring the DC-Input Power Supply in Cisco 3745 Routers Installed Power Supply DC Input Size Wire Size DC Input WireNegative polarity input 0V return Safety ground Connecting WAN, LAN, and Voice Cables Connecting Routers to the Cisco Redundant Power SystemPorts and Cabling Port or Connection Port type, color Cable Connection Procedures and PrecautionsConnecting to the Console Port Connecting to a Console Terminal or Modem24 Connecting a Console Terminal to a Cisco 3725 Router Specifications on Cisco.com Connecting to the Auxiliary Port28 Identifying a Rollover Cable Identifying a Rollover CablePowering Up the Router Checklist for Power UpFront Panel Indicators Cisco 3745 LED Indicators Power-Up ProcedureYourname con0 is now available Press Return to get started Configuring the Router Initial Configuration Using SDMInitial 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 Troubleshooting the Power and Cooling Systems Solving ProblemsTroubleshooting Modules, Cables, and Connections Environmental Reporting FeaturesACT LED SYS/RPS LED PWR LED Reading Front-Panel LEDsSYS/RPS LED Indicator State DescriptionSYS PS1 Reading Rear Panel LEDsPower ETM Error MessagesLED Type LED Color Message System Amber ErrorPS1, PS2 Amber Error LED on PS1, PS2 Amber Recovering a Lost Password Entering ROM Monitor Mode Using the ROM MonitorEnter ROM Monitor Mode by Using the reload Command ROM Monitor CommandsROM Monitor Command Descriptions Boot Commands in the ROM MonitorROM Monitor Syntax Conventions Cisco 3700 Series Routers Hardware Installation Guide Informational Commands in the ROM Monitor Other Useful ROM Monitor Commands Debugging Commands in the ROM MonitorConfiguration Register Modifying the Configuration Register by Hexadecimal Entry Modifying the Configuration Register in Menu ModeRecovering Cisco IOS Software Images Description and Options of the xmodem CommandConsole Requirements Messages similar to the following appear Procedure for the xmodem CommandOL-2180-08 Bit Number Hexadecimal Meaning Configuration Register SettingsYour router is now in the normal operating mode Changing Configuration Register SettingsBoot Field Meaning Configuring the Boot FieldBit Address net host Data Rate Bit Enabling Booting from CompactFlash MemoryOL-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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