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-3
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Appendix C ROM Monitor
Command Descriptions
Command Descriptions
Table C-1 describes the most commonly used ROM monitor commands.
Disaster Recovery with TFTP Download
The standard way to load new software on your router is to use the copy tftp flash privileged EXEC
command from the Cisco
IOS software command-line interface (CLI). However, if the router is unable
to boot Cisco
IOS software, you can load new software while in ROM monitor mode.
This section describes how to load a Cisco IOS software image from a remote TFTP server to the router
flash memory. Use the tftpdnld command only for disaster recovery, because it erases all existing data
in flash memory before downloading a new software image to the router.
TFTP Download Command Variables
This section describes the system variables that can be set in ROM monitor mode and that are used
during the TFTP download process. There are both required variables and optional variables.
Ta b l e C-1 Commonly Used ROM Monitor Commands
Command Description
help or ? Displays a summary of all available ROM monitor commands.
-? Displays information about command syntax; for example:
rommon 16 > dis -?
usage : dis [addr] [length]
The output for this command is slightly different for the xmodem download
command:
rommon 11 > xmodem -?
xmodem: illegal option -- ?
usage: xmodem [-cyrxu] <destination filename>
-c CRC-16
-y ymodem-batch protocol
-r copy image to dram for launch
-x do not launch on download completion
-u upgrade ROMMON, System will reboot after upgrade
reset or i Resets and initializes the router, similar to a power up.
dir device: Lists the files on the named device; for example, flash memory files:
rommon 4 > dir flash:
Directory of flash:/
2 -rwx 10283208 <date> c1800-advsecurityk9-mz
9064448 bytes available (10289152 bytes used)
boot commands For more information about the ROM monitor boot commands, see the Cisco IOS
Configuration Fundamentals and Network Management Guide.
b Boots the first image in flash memory.
b flash: [filename] Attempts to boot the image directly from the first partition of flash memory. If you
do not enter a filename, this command will boot this first image in flash memory.