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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Cisco Systems 3700 Series manual Changing Configuration Register Settings, Your router is now in the normal operating mode
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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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