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Contents
Configuring the Service Assurance Agent8-27
Configuring Secure Shell8-28
Configuring IP Named Access Lists8-29
Configuring International Phone Support8-29
Configuration Example8-30
International Tone, Cadence, Ring Frequency, and Impedance Support8-31
Configuring a Regional Analog Voice Tone8-31
Configuring an FXS Ring Cadence8-32
Configuring the FXS Voice Port Ring Frequency8-33
Configuring the Terminating Impedance8-33
International Caller ID Support8-34
Configuring the FXS Port for Caller ID8-34
Configuring Caller ID Alerting8-35
Configuring Caller ID Display Blocking8-36
Configuring Committed Access Rate8-36
Configuration Example8-36
Configuring VPN IPSec Support Through NAT8-37
NAT Default Inside Server Enhancement8-38
Configuration Example8-38
Configuring VoAAL2 ATM Forum Profile 9 Support8-40
Configuring ATM Forum Profile 98-40
Configuration Example8-42
Configuring ATM OAM F5 Continuity Check Support8-44
Configuring Continuity Checking on a PVC8-44
Configuration Example8-44
Configuring CC Activation and Deactivation Request Frequency8-45
Configuration Example8-46
Disabling CC Support on the VC8-46
Configuration Example8-46 
						

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Configuring Continuity Checking Debugging8-47
Configuring Generation of End-to-End F5 OAM Loopback Cells8-47
Example Output8-48
Configuring RADIUS Support8-49
Configuring Cisco Easy VPN Client8-49
Configuration Example8-50
Configuring Dial-on-Demand Routing for PPPoE Client8-52
Configuring DDR for a PPPoE Client8-53
Configuring Weighted Fair Queuing8-55
Configuring WFQ8-55
Example Configuration8-56
Configuring DSL Commands8-57
Configuration Example8-57
Enabling the DSL Training Log8-57
Retrieving the DSL Training Log and Then Disabling Further Retrieval of 
the Training Log
8-58
Selecting Secondary DSL Firmware8-59
Output Example8-59
Configuration Example8-60
Configuring DNS-Based X.25 Routing8-61
Configuring X.25 Load Balancing8-62
Configuring X.25 Closed User Group8-62
Configuring FTP Client8-63
Configuring Authentication Proxy8-63
Configuring Port to Application Mapping8-64
Configuring CBAC Audit Trails and Alerts8-64
CHAPTER 9Troubleshooting9-1
Before Contacting Cisco or Your Reseller9-2 
						

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ADSL Troubleshooting9-2
ADSL Cable Requirements9-2
G.SHDSL Troubleshooting9-3
show dsl interface Command9-3
ATM Troubleshooting Commands9-6
ping atm interface Command9-6
show interface Command9-7
debug atm Commands9-10
Before Using Debug Commands9-10
debug atm errors Command9-11
debug atm events Command9-12
debug atm packet Command9-13
Troubleshooting Telephone Interfaces9-15
Troubleshooting Serial Line Problems9-16
Synchronous CSU/DSU Clocking Problems9-16
Detecting Problems9-17
Performing Ping Tests9-19
Performing Loopback Tests9-19
Local Loopback Tests9-19
Remote Loopback Tests9-20
Synchronous Leased Line Problems9-21
Asynchronous Dial-Up Problems9-25
Troubleshooting Problems with Modem and Router Connection9-26
No Connectivity Between Modem and Router9-28
Modem Does Not Dial9-29
Modem Does Not Answer9-30
Modem Hangs Up Shortly After Connecting9-32
Dial-Up Client Receives No EXEC Prompt9-34
Dial-Up Session Sees Garbage9-35
Dial-Up Session Ends Up in Existing Session9-36 
						

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Modem Cannot Send or Receive Data9-37
Modem Cannot Send or Receive IP Data9-39
Modem Does Not Disconnect Properly9-41
Link Deactivates Too Quickly9-42
Link Does Not Deactivate or Stays Activated Too Long9-42
Poor Dial-Up Connection Performance9-43
Frame Relay Problems9-45
Frame Relay Link Is Down9-45
Cannot Ping Remote Router9-48
Cannot Ping End to End9-51
X.25 Problems9-51
No Connections over X.25 Link9-52
Excess Serial Errors on X.25 Link9-54
Software Upgrade Methods9-55
Recovering a Lost Password9-55
Changing the Configuration Register9-56
Resetting the Router9-57
Resetting the Password and Saving Your Changes9-59
Resetting the Configuration Register Value9-59
Managing the Cisco Router Web Setup Tool9-60
Pointers to CRWS Documentation9-60
Cisco IOS Basic SkillsA-1
Configuring the Router from a PCA-2
Understanding Command ModesA-3
Getting HelpA-6
Enable Secret and Enable PasswordsA-7
Entering Global Configuration ModeA-8
Using CommandsA-9
Abbreviating CommandsA-9 
						

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Undoing CommandsA-9
Command-Line Error MessagesA-9
Saving Configuration ChangesA-10
Partition and SqueezeA-11
SummaryA-12
Where to Go NextA-13
ROM MonitorB-1
Entering the ROM MonitorB-2
Who Should Upgrade ROMMON and WhyB-3
Where to Find New Versions of ROMMONB-3
Performing the UpgradeB-3
Updating in Cisco IOS EXEC ModeB-5
ROM Monitor CommandsB-5
Command DescriptionsB-6
Disaster Recovery with TFTP DownloadB-7
tftpdnld Command VariablesB-7
Required VariablesB-8
Optional VariablesB-9
Using the TFTP Download Command Without Writing the Image to Flash 
Memory
B-10
Configuration RegisterB-11
Changing the Configuration Register ManuallyB-11
Changing the Configuration Register Using PromptsB-11
Console DownloadB-12
Command DescriptionB-13
Error ReportingB-14
Debug CommandsB-14
Disaster Recovery with Console Download of Cisco IOS SoftwareB-16 
						

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Command DescriptionB-16
Error ReportingB-17
Debug CommandsB-18
Exiting the ROM MonitorB-19
Common Port AssignmentsC-1
Provisioning an ISDN LineD-1
Before Ordering an ISDN LineD-1
Data and Voice ApplicationsD-2
Data and Voice Application FeaturesD-2
ISDN Switch TypesD-4
North American ISDN SwitchesD-4
International SwitchesD-5
NI1 Capability Packages and National ISDN Ordering CodesD-5
Capability Package RD-6
Capability Package SD-6
Capability Package EZ-1 or UD-6
Other SwitchesD-6
Lucent 5ESS Custom ProvisioningD-8
Nortel DMS-100 Custom ProvisioningD-9
ISDN Leased-Line SpeedsD-11
Ordering an ISDN LineD-11
Router Software Configuration RequirementsD-12
NI1 SwitchD-12
Lucent 5ESS Custom SwitchD-13
Point-to-Point ConfigurationD-13
Multipoint ConfigurationD-13
Nortel DMS-100 SwitchD-14
Configure a Router OnlyD-14 
						

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Configure a Router and One DeviceD-15
Configuration Requirements for Switches Outside North AmericaD-15
1TR6 SwitchD-16
ISDN BRI Cause ValuesE-1
INDEX 
						

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About This Guide
This preface describes the audience for, organization of, and conventions used in 
this guide. It also provides information on how to access this guide and other 
Cisco documentation on the Documentation CD-ROM that ships with Cisco 
routers and is available on the World Wide Web. 
This document provides software configuration information for the following 
Cisco routers:
•Cisco 801, 802, 803, 804, 811, and 813 ISDN routers
Cisco 805 serial interface router
Cisco 806 Ethernet router
Cisco 820 series routers
Cisco 831, 836, and 837 routers
Cisco SOHO 70 series routers
Cisco SOHO 91, 96, and 97 routers 
						

							 
About This Guide
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Audience
This guide is intended for network administrators whose backgrounds vary from 
having no or little experience configuring routers to having a high level of 
experience. You can use this guide in the following ways:
You have configured the software using the Cisco Router Web Setup tool, 
and want to configure additional advanced software features using the 
command-line interface (CLI).
You want to configure the software using only the CLI.
NoteCisco recommends that inexperienced network administrators use the 
Cisco Router Web Setup tool to configure their routers.
See the “Organization” section of this guide to help you find the chapter(s) 
containing the information you need to configure your software.
Organization
This guide contains the following information:
Chapter 1, “Concepts”—Provides general concept explanations of the 
Cisco 800 series and Cisco SOHO routers.
Chapter 2, “Configuring Basic Networks”—Describes three basic networks 
that are appropriate to small independent offices and/or telecommuters.
Chapter 3, “Configuring Advanced Networks”—Presents more advanced 
network scenarios involving a private IP network to the Internet and a 
corporate network, and a remote network to two corporate networks.
Chapter 4, “Network Scenarios”—Describes five Internet access scenarios 
and one voice scenario with their specific network topologies and 
configurations.
Chapter 5, “Configuring Remote CAPI”—Describes the Remote Common 
Application Programming Interface (CAPI), a PC-based application 
programming interface standard used to access ISDN equipment.