Cisco Systems 3700 Series manual Bit Address net host

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Appendix C Configuration Register

Configuring the Boot Field

The boot field specifies a number in binary form. If you set the boot field value to 0, you must have console port access to boot the operating system manually. See the boot command in the “ROM Monitor Command Descriptions” section on page B-3.

If you set the boot field to a value of 2 to F, and a valid boot system command is stored in the configuration file, the router software processes each boot command in sequence until the process is successful or the end of the list is reached. If no boot commands are in the configuration file, the router attempts to boot the first file in CompactFlash memory.

In the following example, the configuration register is set to boot the router automatically from CompactFlash memory and to ignore Break at the next reboot of the router:

Router# configure terminal

Enter configuration commands, one per line.

Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z

config-register 0x102

Ctrl-z

Router#

Note A boot system command in the router configuration in NVRAM overrides booting from CompactFlash memory.

Bit 8 controls the console Break key. Setting bit 8 (the factory default) causes the processor to ignore the console Break key. Clearing bit 8 causes the processor to interpret Break as a command to force the router into the bootstrap monitor, halting normal operation. Break can always be sent in the first

60 seconds while the router is rebooting, regardless of the configuration settings.

Bit 9 controls the system boot. Clearing bit 9 (the factory default) causes the system to boot from CompactFlash memory. Clearing bit 9 causes the system to use the secondary bootstrap. This bit is typically not used.

Bit 10 controls the host portion of the IP broadcast address. Setting bit 10 causes the processor to use all zeros; clearing bit 10 (the factory default) causes the processor to use all ones. Bit 10 interacts with bit 14, which controls the network and subnet portions of the broadcast address. Table C-3shows the combined effect of bits 10 and 14.

Table C-3

Configuration Register Settings for Broadcast Address Destination

 

 

 

 

Bit 10

Bit 14

Address (<net> <host>)

 

 

 

 

Off

Off

<ones> <ones>

 

 

 

 

On

Off

<zeros> <zeros>

 

 

 

 

On

On

<net> <zeros>

 

 

 

 

Off

On

<net> <ones>

 

 

 

 

Bit 13 determines how the router responds to a bootload failure. Setting bit 13 causes the router to load operating software from ROM after six unsuccessful attempts to load a boot file. Clearing bit 13 causes the router to continue indefinitely to attempt loading a boot file. By factory default, bit 13 is set to 0.

Bits 5, 11, and 12 of the configuration register determine the data rate of the console terminal. Table C-4shows the bit settings for the eight available rates. (The default data rate is 9600 bps.)

Cisco 3700 Series Routers Hardware Installation Guide

 

C-4

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 ObjectivesConventions AudienceOrganization 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 Cisco.com Obtaining DocumentationDocumentation Feedback 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 ConnectionsSerial Connections Configuring Serial ConnectionsToken Ring Connections Serial DTE or DCE DevicesDistance Limitations Signaling Standards SupportedDevice Type Gender Typical Devices EIA/TIA-232 Isdn BRI ConnectionsAsynchronous/Synchronous Serial Module Data Rates 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 ConnectionsWiring the DC-Input Power Supply in Cisco 3725 Routers Connecting Routers to AC PowerConnecting Routers to a DC-Input Power Supply 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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