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
14-9
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Chapter 14 Troubleshooting
Software Upgrade Methods
Software Upgrade Methods
Several methods are available for upgrading software on the Cisco 1800 series integrated services
fixed-configuration routers, including:
• Copy the new software image to flash memory over the LAN or WAN while the existing Cisco IOS
software image is operating.
• Copy the new software image to flash memory over the LAN while the boot image (ROM monitor)
is operating.
• Copy the new software image over the console port while in ROM monitor mode.
• From ROM monitor mode, boot the router from a software image that is loaded on a TFTP server.
To use this method, the TFTP server must be on the same LAN as the router.
Recovering a Lost Password
To recover a lost enable or lost enable-secret password:
1. Change the Configuration Register
2. Reset the Router
3. Reset the Password and Save Your Changes (for lost enable secret passwords only)
4. Reset the Configuration Register Value
Note Recovering a lost password is only possible when you are connected to the router through the console
port. These procedures cannot be performed through a Telnet session.
Tip See the “Hot Tips” section on Cisco.com for additional information on replacing enable secret
passwords.
Ta b l e 14-3 debug atm packet Command Output Description
Field Description
ATM 0 Interface that is generating the packet.
(O) Output packet. (I) would mean receive packet.
VCD: 0xn Virtual circuit associated with this packet, where n is some value.
VPI: 0xn Virtual path identifier for this packet, where n is some value.
DM: 0xn Descriptor mode bits, where n is some value.
Length: n Total length of the packet (in bytes) including the ATM headers.