A P P E N D I X C

Configuration Register

This appendix describes the factory default settings of the configuration register, and procedures for changing those settings.

This appendix includes the following sections:

Configuration Register Settings, page C-1

Changing Configuration Register Settings, page C-2

Configuring the Boot Field, page C-3

Enabling Booting from CompactFlash Memory, page C-5

Configuration Register Settings

The router has a 16-bit configuration register in NVRAM. You can use the configuration register to perform the following tasks:

Set and display the configuration register value.

Force the router into the ROM monitor (bootstrap program).

Select a boot source and default boot filename.

Enable or disable the Break function.

Control broadcast addresses.

Load operating software from ROM.

Table C-1describes each of the configuration register bits.

 

 

Table C-1

Configuration Bit Meanings

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

 

 

 

 

Number

Hexadecimal

Meaning

 

 

 

 

 

 

 

00–03

0x0000–0x000F

Boot field. (See Table C-2.)

 

 

 

 

06

0x0040

Causes the system software to ignore the contents of NVRAM.

 

 

 

 

07

0x0080

OEM bit enabled.

 

 

 

 

08

0x0100

Break disabled.

 

 

 

 

09

0x0200

Causes the system to use the secondary bootstrap. This bit is typically not

 

 

 

 

used (set to 0).

 

 

 

 

 

 

 

 

 

 

 

 

Cisco 3700 Series Routers Hardware Installation Guide

 

 

 

 

 

 

 

 

 

OL-2180-08

 

 

 

C-1

 

 

 

 

 

 

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Cisco Systems 3700 Series manual Configuration Register Settings, Bit Number Hexadecimal Meaning

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.