Cisco Systems 3700 Series manual Changing Configuration Register Settings

Page 104

Appendix C Configuration Register

Changing Configuration Register Settings

Table C-1

Configuration Bit Meanings (continued)

 

 

 

Bit

 

 

Number

Hexadecimal

Meaning

 

 

 

10

0x0400

IP broadcast with all zeros.

 

 

 

5, 11, 12

0x0020,

Console line speed.

 

0x0800, 0x1000

 

 

 

 

13

0x2000

Boots default ROM software if the network boot fails.

 

 

 

14

0x4000

IP broadcasts do not have net numbers.

 

 

 

15

0x8000

Enables diagnostic messages and ignores the contents of NVRAM.

 

 

 

Changing Configuration Register Settings

You might want to modify the value in the configuration register to perform the following tasks:

•Recover a lost password.

•Change the console data rate.

•Enable or disable the Break function.

•Manually boot the operating system using the b command at the ROM monitor prompt.

•Force the router to automatically boot its system image in CompactFlash memory, or boot in accordance with any boot system commands stored in the router’s configuration file in NVRAM.

You can change the configuration register either from the ROM monitor or from the operating system software. To change the configuration register from the ROM monitor, see the “Configuration Register” section on page B-6. To change the configuration register from the system software, perform the following steps:

Step 1 Connect a console terminal to the console port of the router as described in the “Connecting to the

Console Port” section on page 3-22, using the blue RJ-45 to DB-9 console adapter cable.

Note If you have a terminal with a DB-25 port, use an RJ-45 rollover cable and DB-25 adapter. The RJ-45-to-DB-25 adapter (Cisco part number 29-0810-01) can be purchased from Cisco.

For information about cable pinouts, see the publication Cisco Modular Access Router Cable

Specifications on Cisco.com.

Step 2 Configure your terminal or terminal emulation software for 9600 bps (default), 8 data bits, no parity, and 2 stop bits.

Step 3 Power up the router.

Step 4 When asked if you would like to enter the initial dialog, answer no:

Would you like to enter the initial dialog? [yes]: no

Your router is now in the normal operating mode.

Cisco 3700 Series Routers Hardware Installation Guide

 

C-2

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 DocumentationCisco Technical Support Website Submitting a Service RequestObtaining Technical Assistance 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 MemoryWAN and LAN Interface Numbering Interface NumberingCisco 3725 Interfaces Voice Interface Numbering Gigabit Ethernet 2/0Cisco 3745 Interfaces Network-module-slot/voice-module-slot/voice-interface Power Supply Option Cisco Power Supply OptionsInternal -48 V Telephony Power Modules 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 DamageGeneral Site Requirements Power Supply ConsiderationsRouter Power Supply Input Power Input Voltage Equipment Racks Site ConfigurationSite Environment Installation Checklist Task Verified by DateCreating a Site Log Inspecting the RouterPage Auxiliary Port Connections Console and Auxiliary Port ConsiderationsConsole Port Connections Preparing to Connect to a Network Ethernet ConnectionsConfiguring Serial Connections Token Ring ConnectionsSerial Connections Serial DTE or DCE DevicesDevice Type Gender Typical Devices Signaling Standards SupportedDistance Limitations 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 Ports and Cabling Connecting WAN, LAN, and Voice CablesConnecting Routers to the Cisco Redundant Power System 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 CableFront Panel Indicators Powering Up the RouterChecklist for Power Up Power-Up Procedure Cisco 3745 LED IndicatorsYourname con0 is now available Press Return to get started Initial Configuration Using the Setup Command Facility Configuring the RouterInitial Configuration Using SDM 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 CommandROM Monitor Syntax Conventions ROM Monitor Command DescriptionsBoot Commands in the ROM Monitor Cisco 3700 Series Routers Hardware Installation Guide Informational Commands in the ROM Monitor Configuration Register Other Useful ROM Monitor CommandsDebugging Commands in the ROM Monitor Modifying the Configuration Register in Menu Mode Modifying the Configuration Register by Hexadecimal EntryConsole Requirements Recovering Cisco IOS Software ImagesDescription and Options of the xmodem Command 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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