Specifications
Table Of Contents
- Contents
- Preface
- Getting Started
- Basic Router Configuration
- Interface Port Labels
- Viewing the Default Configuration
- Information Needed for Configuration
- Configuring Basic Parameters
- Configuring Static Routes
- Configuring Dynamic Routes
- Configuring Enhanced IGRP
- Basic Router Configuration
- Configuring Your Router for Ethernet and DSL Access
- Sample Network Deployments
- Configuring PPP over Ethernet with NAT
- Configuring PPP over ATM with NAT
- Configuring a LAN with DHCP and VLANs
- Configuring a VPN Using Easy VPN and an IPSec Tunnel
- Configure the IKE Policy
- Configure Group Policy Information
- Apply Mode Configuration to the Crypto Map
- Enable Policy Lookup
- Configure IPSec Transforms and Protocols
- Configure the IPSec Crypto Method and Parameters
- Apply the Crypto Map to the Physical Interface
- Create an Easy VPN Remote Configuration
- Verifying Your Easy VPN Configuration
- Configuration Example
- Configuring VPNs Using an IPSec Tunnel and Generic Routing Encapsulation
- Configuring a Simple Firewall
- Configuring a Wireless LAN Connection
- Sample Configuration
- Configuring Additional Features and Troubleshooting
- Additional Configuration Options
- Configuring Security Features
- Configuring Dial Backup and Remote Management
- Troubleshooting
- Reference Information
- Cisco IOS Software Basic Skills
- Concepts
- ROM Monitor
- Common Port Assignments
C-1
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
APPENDIX
C
ROM Monitor
The ROM monitor firmware runs when the router is powered up or reset. The firmware helps to initialize
the processor hardware and boot the operating system software. You can use the ROM monitor to
perform certain configuration tasks, such as recovering a lost password or downloading software over
the console port. If there is no Cisco
IOS software image loaded on the router, the ROM monitor runs
the router.
This appendix contains the following sections:
• Entering the ROM Monitor
• ROM Monitor Commands
• Command Descriptions
• Disaster Recovery with TFTP Download
• Configuration Register
• Console Download
• Debug Commands
• Exiting the ROM Monitor
Entering the ROM Monitor
To use the ROM monitor, you must be using a terminal or PC that is connected to the router over the
console port.
Perform these steps to configure the router to boot up in ROM monitor mode the next time it is rebooted.
Command Purpose
Step 1
enable Enters privileged EXEC mode. If an enable password is configured, you
must enter the enable command and the enable password to enter privileged
EXEC mode.
Step 2
configure terminal Enters global configuration mode.
Step 3
config-reg 0x0 Resets the configuration register.