Other Useful ROM Monitor Commands

Appendix B Using the ROM Monitor

ROM Monitor Command Descriptions

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rommon 2>

reset or i—Resets and initializes the router, similar to power up.

Debugging Commands in the ROM Monitor

Most debugging commands are functional only when Cisco IOS software has crashed or failed to initialize (boot). Debugging commands should normally be entered only under the direction of a Cisco engineer. If you enter a debugging command and Cisco IOS crash information is not available, the following error message appears:

“xxx: kernel context state is invalid, cannot proceed.”

The following ROM monitor debugging commands provide information about software failures:

•stack or k—Produces a stack trace.

•context—Displays processor context.

•frame—Displays an individual stack frame.

•sysret—Displays return information from the last booted system image. This information includes the reason for terminating the image; a stack dump of up to eight frames; and, if an exception is involved, the address where the exception occurred; for example:

rommon 8> sysret

System Return Info:

count: 19, reason: a SegV exception

pc:0x802b1040, error address: 0x802b1040 Stack Trace:

FP: 0x80908398, PC: 0x802b102c

FP: 0x809083b0, PC: 0x802b0b88

FP: 0x809083d8, PC: 0x8017039c

FP: 0x809083e8, PC: 0x8016f764

Configuration Register

The configuration register resides in NVRAM. You can view or modify the configuration register from either the ROM monitor or the operating system software.

For procedures used to change the configuration register from the operating system, and for information about configuration register settings, see Appendix C, “Configuration Register.”

To modify the configuration register from the ROM monitor, use one of these methods:

•Enter the confreg command by itself for menu mode. See the “Modifying the Configuration Register in Menu Mode” section below.

•Enter the confreg command plus the new hexadecimal value of the configuration register. See the next section, “Modifying the Configuration Register by Hexadecimal Entry.”

Cisco 3700 Series Routers Hardware Installation Guide

	B-6	OL-2180-08

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.

Cisco Systems 3700 Series manual Other Useful ROM Monitor Commands, Configuration Register

Models: 3700 Series