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
14-6
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Chapter 14 Troubleshooting
ATM Troubleshooting Commands
Table 14-2 describes some of the fields shown in the command output.
debug atm Commands
Use the debug commands to troubleshoot configuration problems that you might be having on your
network. The debug commands provide extensive, informative displays to help you interpret any
possible problems.
Guidelines for Using Debug Commands
Read the following guidelines before using debug commands to ensure appropriate results.
• All debug commands are entered in privileged EXEC mode.
• To view debugging messages on a console, enter the logging console debug command.
• Most debug commands take no arguments.
• To disable debugging, enter the undebug all command.
• To use debug commands during a Telnet session on your router, enter the terminal monitor
command.
Caution Debugging is assigned a high priority in your router CPU process, and it can render your router unusable.
For this reason, use debug commands only to troubleshoot specific problems. The best time to use debug
commands is during periods of low network traffic so that other activity on the network is not adversely
affected.
You can find additional information and documentation about the debug commands in the Cisco IOS
Debug Command Reference.
debug atm errors Command
Use the debug atm errors command to display ATM errors. The no form of this command disables
debugging output.
Example 14-4 shows a sample output.
Ta b l e 14-2 show atm interface Command Output Description
Field Description
ATM in t e r fac e Interface number. Always 0 for the Cisco 1800 fixed-configuration routers.
AAL enabled Type of AAL enabled. The Cisco 1800 fixed-configuration routers support AAL5.
Maximum VCs Maximum number of virtual connections this interface supports.
Current VCCs Number of active virtual channel connections (VCCs).
Maximum
Transmit
Channels
Maximum number of transmit channels.
Max Datagram
Size
Configured maximum number of bytes in the largest datagram.
PLIM Type Physical layer interface module (PLIM) type.