Cisco OL-6426-02 User Manual

Cisco 1800 Series Integrated Services Router (Fixed) Software Installation Guide

Cisco Systems, Inc.

www.cisco.com

Cisco has more than 200 offices worldwide. Addresses, phone numbers, and fax numbers are listed on the Cisco website at www.cisco.com/go/offices.

Last Revised: February 19, 2014 Text Part Number: OL-6426-02

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THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.

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The following information is for FCC compliance of Class B devices: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If the equipment causes interference to radio or television reception, which can be determined by turning the equipment off and on, users are encouraged to try to correct the interference by using one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

Modifications to this product not authorized by Cisco could void the FCC approval and negate your authority to operate the product.

The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.

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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

Cisco 1800 Series Integrated Services Router (Fixed) Software Installation Guide

Preface 11

Audience 1-11

Organization 1-12

Conventions 1-13

Notes, Cautions, and Timesavers 1-13 Command Conventions 1-13

Preface

This software configuration guide provides instructions for using the Cisco command-line interface (CLI) to configure features of the following Cisco 1800 series integrated services fixed-configuration routers:

• Cisco 1801, Cisco 1802, and Cisco 1803 DSL Access Routers

• Cisco 1811 and Cisco 1812 Ethernet Access Routers

Audience

This preface describes the intended audience, the organization of this guide, and the text and command conventions used throughout the guide. The preface includes the following topics:

• Audience

• Organization

• Conventions

• Related Documents

• Obtaining Documentation

• Documentation Feedback

• Obtaining Technical Assistance

• Obtaining Additional Publications and Information

This guide is intended for network administrators whose backgrounds vary from having no or little experience in configuring routers to having a high level of experience. You can use this guide in the following situations:

• You have configured the software by using the Cisco Router Web Setup tool, and you want to

configure additional advanced software features by using the command-line interface (CLI).

• You want to configure the software using only the CLI.

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Note We strongly recommend that network administrators with minimal familiarity with Cisco routers use the

Cisco Router and Security Device Manager (SDM)—a web-based configuration tool that allows you to configure LAN and WAN interfaces, routing, Network Address Translation (NAT), firewalls, VPNs, and other features on your router. To obtain the SDM release notes and other SDM documentation, go to

http://www.cisco.com/go/sdm and click the Technical Documentation link.

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

Organization

See the “Organization” section of this preface to help you decide which chapters contain the information you need to configure your router.

Organization

Table 1 lists the topics covered by this guide.

Table 1 Document Organization

Chapter Title Description

Chapter 1 Basic Router Configuration Describes how to configure basic router features and

interfaces.

Chapter 2 Sample Network Deployments Provides a road map for possible network deployments.

Chapter 3 Configuring PPP over Ethernet with NAT Provides instructions on how to configure PPPoE with

Network Address Translation (NAT) on your Cisco router.

Chapter 4 Configuring PPP over ATM with NAT Provides instructions on how to configure PPPoA with

Network Address Translation (NAT) on your Cisco router.

Chapter 5 Configuring a LAN with DHCP and VLANs Provides instructions on how to configure your Cisco router

with multiple VLANs and to act as a DHCP server.

Chapter 6 Configuring a VPN Using Easy VPN and an

IPSec Tunnel

Chapter 7 Configuring VPNs Using an IPSec Tunnel

and Generic Routing Encapsulation

Chapter 8 Configuring a Simple Firewall Provides instructions on how to configure a basic firewall on

Chapter 9 Configuring a Wireless LAN Connection Provides instructions on how to configure a wireless LAN.

Chapter 10 Sample Configuration Presents a summary configuration example showing features

Chapter 11 Additional Configuration Options Provides a road map for Part 3.

Chapter 12 Configuring Security Features Explains basic configuration of Cisco IOS security features,

Chapter 13 Configuring Dial Backup and Remote

Management

Chapter 14 Troubleshooting Provides information on identifying and solving problems,

Appendix A Cisco IOS Software Basic Skills Explains what you need to know about Cisco IOS software

Appendix B Concepts Provides general concept explanations of features.

Appendix C ROM Monitor Describes the use of the ROM Monitor (ROMMON) utility.

Appendix D Common Port Assignments Describes the currently assigned Transmission Control

Index

Provides instructions on how to configure a virtual private network (VPN) with a secure IP tunnel using the Cisco Easy VPN.

Provides instructions on how to configure a VPN with a secure IP tunnel and generic routing encapsulation (GRE).

your Cisco router.

configured in the preceding chapters of this part of the guide.

including firewall and VPN configuration.

Provides instructions on how to configure your Cisco router for dial backup and remote management.

such as how to recover a lost software password.

before you begin to configure it.

Protocol (TCP) and User Datagram Protocol (UDP) port numbers.

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Conventions

This guide uses the conventions described in the following sections for instructions and information.

Notes, Cautions, and Timesavers

Notes, cautions and time-saving tips use the following conventions and symbols:

Note Means reader take note. Notes contain helpful suggestions or references to materials not contained in

this guide.

Caution This caution symbol means reader be careful. In this situation, you might do something that could result

in equipment damage or loss of data.

Conventions

Timesaver This symbol means the described action saves time.

Command Conventions

Table 2 describes the command syntax used in this guide.

Table 2 Command Syntax Conventions

Convention Description

boldface Commands and keywords.

italic Command input that is supplied by you.

[ ] Optional keywords and default responses to system

{x | x | x} A choice of keywords (represented by x) appears in

^ or Ctrl Represents the key labeled Control. For example,

screen font

boldface screen font

prompts appear within square brackets.

braces separated by vertical bars. You must select one.

when you read ^D or Ctrl-D, you should hold down the Control key while you press the D key.

Examples of information displayed on the screen.

Examples of information that you must enter.

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Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

Obtaining Documentation

Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems.

Cisco.com

You can access the most current Cisco documentation at this URL:

http://www.cisco.com/univercd/home/home.htm

You can access the Cisco website at this URL:

http://www.cisco.com

You can access international Cisco websites at this URL:

http://www.cisco.com/public/countries_languages.shtml

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Documentation DVD

Cisco documentation and additional literature are available in a Documentation DVD package, which may have shipped with your product. The Documentation DVD is updated regularly and may be more current than printed documentation. The Documentation DVD package is available as a single unit.

Registered Cisco.com users (Cisco direct customers) can order a Cisco Documentation DVD (product number DOC-DOCDVD=) from the Ordering tool or Cisco Marketplace.

Cisco Ordering tool:

http://www.cisco.com/en/US/partner/ordering/

Cisco Marketplace:

http://www.cisco.com/go/marketplace/

Ordering Documentation

You can find instructions for ordering documentation at this URL:

http://www.cisco.com/univercd/cc/td/doc/es_inpck/pdi.htm

Documentation Feedback

You can order Cisco documentation in these ways:

• Registered Cisco.com users (Cisco direct customers) can order Cisco product documentation from

the Ordering tool:

http://www.cisco.com/en/US/partner/ordering/

• Nonregistered Cisco.com users can order documentation through a local account representative by

calling Cisco Systems Corporate Headquarters (California, USA) at 408 526-7208 or, elsewhere in North America, by calling 1 800 553-NETS (6387).

Documentation Feedback

You can send comments about technical documentation to bug-doc@cisco.com.

You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address:

Cisco Systems Attn: Customer Document Ordering 170 West Tasman Drive San Jose, CA 95134-9883

We appreciate your comments.

Cisco Product Security Overview

Cisco provides a free online Security Vulnerability Policy portal at this URL:

http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html

From this site, you can perform these tasks:

• Report security vulnerabilities in Cisco products.

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Obtaining Technical Assistance

• Obtain assistance with security incidents that involve Cisco products.

• Register to receive security information from Cisco.

A current list of security advisories and notices for Cisco products is available at this URL:

http://www.cisco.com/go/psirt

If you prefer to see advisories and notices as they are updated in real time, you can access a Product Security Incident Response Team Really Simple Syndication (PSIRT RSS) feed from this URL:

http://www.cisco.com/en/US/products/products_psirt_rss_feed.html

Reporting Security Problems in Cisco Products

Cisco is committed to delivering secure products. We test our products internally before we release them, and we strive to correct all vulnerabilities quickly. If you think that you might have identified a vulnerability in a Cisco product, contact PSIRT:

• Emergencies— security-alert@cisco.com

• Nonemergencies— psirt@cisco.com

Tip We encourage you to use Pretty Good Privacy (PGP) or a compatible product to encrypt any sensitive

information that you send to Cisco. PSIRT can work from encrypted information that is compatible with PGP versions 2.x through 8.x.

Never use a revoked or an expired encryption key. The correct public key to use in your correspondence with PSIRT is the one that has the most recent creation date in this public key server list:

http://pgp.mit.edu:11371/pks/lookup?search=psirt%40cisco.com&op=index&exact=on

In an emergency, you can also reach PSIRT by telephone:

• 1 877 228-7302

• 1 408 525-6532

Obtaining Technical Assistance

For all customers, partners, resellers, and distributors who hold valid Cisco service contracts, Cisco Technical Support provides 24-hour-a-day, award-winning technical assistance. The Cisco Technical Support Website on Cisco.com features extensive online support resources. In addition, Cisco Technical Assistance Center (TAC) engineers provide telephone support. If you do not hold a valid Cisco service contract, contact your reseller.

Cisco Technical Support Website

The Cisco Technical Support Website provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The website is available 24 hours a day, 365 days a year, at this URL:

http://www.cisco.com/techsupport

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Access to all tools on the Cisco Technical Support Website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register at this URL:

http://tools.cisco.com/RPF/register/register.do

Note Use the Cisco Product Identification (CPI) tool to locate your product serial number before submitting

a web or phone request for service. You can access the CPI tool from the Cisco Technical Support Website by clicking the Tools & Resources link under Documentation & Tools. Choose Cisco Product

Identification Tool from the Alphabetical Index drop-down list, or click the Cisco Product Identification Tool link under Alerts & RMAs. The CPI tool offers three search options: by product ID

or model name; by tree view; or for certain products, by copying and pasting show command output. Search results show an illustration of your product with the serial number label location highlighted. Locate the serial number label on your product and record the information before placing a service call.

Submitting a Service Request

Using the online TAC Service Request Tool is the fastest way to open S3 and S4 service requests. (S3 and S4 service requests are those in which your network is minimally impaired or for which you require product information.) After you describe your situation, the TAC Service Request Tool provides recommended solutions. If your issue is not resolved using the recommended resources, your service request is assigned to a Cisco TAC engineer. The TAC Service Request Tool is located at this URL:

Obtaining Technical Assistance

http://www.cisco.com/techsupport/servicerequest

For S1 or S2 service requests or if you do not have Internet access, contact the Cisco TAC by telephone. (S1 or S2 service requests are those in which your production network is down or severely degraded.) Cisco TAC engineers are assigned immediately to S1 and S2 service requests to help keep your business operations running smoothly.

To open a service request by telephone, use one of the following numbers:

Asia-Pacific: +61 2 8446 7411 (Australia: 1 800 805 227) EMEA: +32 2 704 55 55 USA: 1 800 553-2447

For a complete list of Cisco TAC contacts, go to this URL:

http://www.cisco.com/techsupport/contacts

Definitions of Service Request Severity

To ensure that all service requests are reported in a standard format, Cisco has established severity definitions.

Severity 1 (S1)—Your network is “down,” or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.

Severity 2 (S2)—Operation of an existing network is severely degraded, or significant aspects of your business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.

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Obtaining Additional Publications and Information

Severity 3 (S3)—Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.

Severity 4 (S4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations.

Obtaining Additional Publications and Information

Information about Cisco products, technologies, and network solutions is available from various online and printed sources.

• Cisco Marketplace provides a variety of Cisco books, reference guides, and logo merchandise. Visit

Cisco Marketplace, the company store, at this URL:

http://www.cisco.com/go/marketplace/

• Cisco Press publishes a wide range of general networking, training and certification titles. Both new

and experienced users will benefit from these publications. For current Cisco Press titles and other information, go to Cisco Press at this URL:

http://www.ciscopress.com

• Pack et magazine is the Cisco Systems technical user magazine for maximizing Internet and

networking investments. Each quarter, Packet delivers coverage of the latest industry trends, technology breakthroughs, and Cisco products and solutions, as well as network deployment and troubleshooting tips, configuration examples, customer case studies, certification and training information, and links to scores of in-depth online resources. You can access Packet magazine at this URL:

http://www.cisco.com/packet

• Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering

professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL:

http://www.cisco.com/ipj

• World-class networking training is available from Cisco. You can view current offerings at

this URL:

http://www.cisco.com/en/US/learning/index.html

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ART

Getting Started

CHA PTER

Basic Router Configuration

This chapter provides procedures for configuring the basic parameters of your Cisco router, including global parameter settings, routing protocols, interfaces, and command-line access. It also describes the default configuration on startup. Note that individual router models may not support every feature described throughout this guide. Features not supported by a particular router are indicated whenever possible.

This chapter contains the following sections:

• Interface Port Labels

• Viewing the Default Configuration

• Information Needed for Configuration

• Configuring Basic Parameters

• Configuring Static Routes

• Configuring Dynamic Routes

• Configuring Enhanced IGRP

Each section includes a configuration example and verification steps, as available.

For complete information on how to access global configuration mode, see the “Entering Global

Configuration Mode” section in Appendix A, “Cisco IOS Basic Skills.” For more information on the

commands used in the following tables, see the Cisco IOS Release 12.3 documentation set.

Interface Port Labels

Table 1-1 lists the interfaces supported for each router and their associated port labels on the equipment.

Table 1-1 Supported Interfaces and Associated Port Labels by Cisco Router

Router Interface Port Label

Cisco 1801 Fast Ethernet LANs SWITCH and FE8–FE5 (top), FE x and

FE4–FE1 (bottom)

Fast Ethernet WANs FE0

ATM WAN ADSLoPOTS

Wireless LAN LEFT, RIGHT/PRIMARY

BRI ISDN S/T

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1-1

Viewing the Default Configuration

Table 1-1 Supported Interfaces and Associated Port Labels by Cisco Router (continued)

Router Interface Port Label

Cisco 1802 Fast Ethernet LANs SWITCH and FE8–FE5 (top), FE x and

Cisco 1803 Fast Ethernet LANs SWITCH and FE8–FE5 (top), FE x and

Cisco 1811 Fast Ethernet LANs SWITCH and FE9–FE6 (top), FE x and

Cisco 1812 Fast Ethernet LANs SWITCH and FE9–FE6 (top), FE x and

Chapter 1 Basic Router Configuration

FE4–FE1 (bottom)

Fast Ethernet WANs FE0

ATM WAN ADSLoISDN

Wireless LAN LEFT, RIGHT/PRIMARY

BRI ISDN S/T

FE4–FE1 (bottom)

Fast Ethernet WANs FE0

ATM WAN G . SH D SL

Wireless LAN LEFT, RIGHT/PRIMARY

BRI ISDN S/T

FE5–FE2 (bottom)

Fast Ethernet WANs FE0–FE1

Wireless LAN LEFT, RIGHT/PRIMARY

USB 1–0

V. 9 2 M OD EM

FE5–FE2 (bottom)

Fast Ethernet WANs FE0–FE1

Wireless LAN LEFT, RIGHT/PRIMARY

BRI ISDN S/T

USB 1–0

Viewing the Default Configuration

When you first boot up your Cisco router, some basic configuration has already been performed. All of the LAN and WAN interfaces have been created, console and VTY ports are configured, and the inside interface for Network Address Translation has been assigned. Use the show running-config command to view the initial configuration, as shown in Example 1-1.

Note If you are unable to view the initial configuration and you get a No Password Set error message, you

must reset the initial password. For details, see the “Recovering a Lost Password” section in Chapter 14,

“Troubleshooting”.

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Chapter 1 Basic Router Configuration

Example 1-1 Cisco 1812 Default Configuration on Startup

version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! mmi polling-interval 60 no mmi auto-configure no mmi pvc mmi snmp-timeout 180 no aaa new-model ip subnet-zero ! ip cef ! ip ips po max-events 100 no ftp-server write-enable ! interface BRI0 no ip address shutdown ! interface FastEthernet0 no ip address shutdown duplex auto speed auto ! interface FastEthernet1 no ip address shutdown duplex auto speed auto ! interface FastEthernet2 no ip address shutdown ! interface FastEthernet3 no ip address shutdown ! interface FastEthernet4 no ip address shutdown ! interface FastEthernet5 no ip address shutdown ! interface FastEthernet6 no ip address shutdown ! interface FastEthernet7 no ip address shutdown !

Viewing the Default Configuration

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Information Needed for Configuration

interface FastEthernet8 no ip address shutdown ! interface FastEthernet9 no ip address shutdown ! interface Vlan1 no ip address ! ip classless ! no ip http server no ip http secure-server ! control-plane ! line con 0 line aux 0 line vty 0 4 ! no scheduler allocate end

Chapter 1 Basic Router Configuration

Information Needed for Configuration

You need to gather some or all of the following information, depending on your planned network scenario, prior to configuring your network

• If you are setting up an Internet connection, gather the following information:

–

Point-to-Point Protocol (PPP) client name that is assigned as your login name

–

PPP authentication type: Challenge Handshake Authentication Protocol (CHAP) or Password Authentication Protocol (PAP)

–

PPP password to access your Internet service provider (ISP) account

–

DNS server IP address and default gateways

• If you are setting up a connection to a corporate network, you and the network administrator must

generate and share the following information for the WAN interfaces of the routers:

–

PPP authentication type: CHAP or PAP

–

PPP client name to access the router

–

PPP password to access the router

• If you are setting up IP routing:

–

Generate the addressing scheme for your IP network.

–

Determine the IP routing parameter information, including IP address, and ATM permanent virtual circuits (PVCs). These PVC parameters are typically virtual path identifier (VPI), virtual circuit identifier (VCI), and traffic shaping parameters.

1-4

–

Determine the number of PVCs that your service provider has given you, along with their VPIs and VCIs.

–

For each PVC determine the type of AAL5 encapsulation supported. It can be one of the following:

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Chapter 1 Basic Router Configuration

AAL5SNAP—This can be either routed RFC 1483 or bridged RFC 1483. For routed RFC 1483, the service provider must provide you with a static IP address. For bridged RFC 1483, you may use DHCP to obtain your IP address, or you may obtain a static IP address from your service provider.

AAL5MUX PPP—With this type of encapsulation, you need to determine the PPP-related configuration items.

• If you plan to connect over an ADSL or G.SHDSL line:

–

Order the appropriate line from your public telephone service provider.

For ADSL lines—Ensure that the ADSL signaling type is DMT (also called ANSI T1.413) or DMT Issue 2.

For G.SHDSL lines—Verify that the G.SHDSL line conforms to the ITU G.991.2 standard and supports Annex A (North America) or Annex B (Europe).

Once you have collected the appropriate information, you can perform a full configuration on your router, beginning with the tasks in the “Configuring Basic Parameters” section.

Configuring Basic Parameters

To configure the router, perform one or more of these tasks:

• Configure Global Parameters

• Configure Fast Ethernet LAN Interfaces

• Configure WAN Interfaces

• Configuring a Loopback Interface

• Configuring Command-Line Access to the Router

A configuration example is presented with each task to show the network configuration following completion of that task.

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Configuring Basic Parameters

Configure Global Parameters

Perform these steps to configure selected global parameters for your router:

Command Purpose

Step 1

configure terminal

Example:

Router> enable Router# configure terminal Router(config)#

Chapter 1 Basic Router Configuration

Enters global configuration mode, when using the console port.

If you are connecting to the router using a remote terminal, use the following:

telnet router name or address Login: login id Password: ********* Router> enable

Step 2

Step 3

Step 4

hostname name

Example:

Router(config)# hostname Router Router(config)#

enable secret password

Specifies the name for the router.

Specifies an encrypted password to prevent unauthorized access to the router.

Example:

Router(config)# enable secret cr1ny5ho Router(config)#

no ip domain-lookup

Disables the router from translating unfamiliar words (typos) into IP addresses.

Example:

Router(config)# no ip domain-lookup Router(config)#

For complete information on the global parameter commands, see the Cisco IOS Release 12.3 documentation set.

Configure Fast Ethernet LAN Interfaces

The Fast Ethernet LAN interfaces on your router are automatically configured as part of the default VLAN and as such, they are not configured with individual addresses. Access is afforded through the VLAN. You may assign the interfaces to other VLANs if desired. For more information about creating VLANs, see Chapter 5, “Configuring a LAN with DHCP and VLANs.”

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Chapter 1 Basic Router Configuration

Configure WAN Interfaces

The Cisco 1811 and Cisco 1812 routers each have two Fast Ethernet interfaces for WAN connection. The Cisco 1801, Cisco 1802, and Cisco 1803 routers each have one ATM interface for WAN connection.

Based on the router model you have, configure the WAN interface(s) using one of the following procedures:

• Configure the Fast Ethernet WAN Interface

• Configure the ATM WAN Interface

Configure the Fast Ethernet WAN Interface

This procedure applies only to the Cisco 1811 and Cisco 1812 router models. Perform these steps to configure the Fast Ethernet interfaces, beginning in global configuration mode.

Command Purpose

Step 1

interface type number

Example:

Router(config)#interface fastethernet 0 Router(config-int)#

Configuring Basic Parameters

Enters the configuration mode for a Fast Ethernet WAN interface on the router.

Note Fast Ethernet WAN ports are numbered

0–1 on the Cisco 1800 series routers.

Step 2

ip address ip-address mask

Sets the IP address and subnet mask for the specified Fast Ethernet interface.

Example:

Router(config-int)# ip address 192.1.12.2

255.255.255.0

Router(config-int)#

Step 3

no shutdown

Enables the Ethernet interface, changing its state from administratively down to administratively up.

Exits interface configuration mode and returns

Step 4

Example:

Router(config-int)# no shutdown Router(config-int)#

exit

to global configuration mode.

Example:

Router(config-int)# exit Router(config)#

Repeat these steps for the other Fast Ethernet WAN interface if desired.

Note Due to a limitation on the internal transceiver of the on-board layer-3 Fast Ethernet interfaces available

on Cisco 1812 Ethernet Access Routers, configuring the interface with a speed of 10 Mbps may cause some CRC errors to appear on the interface. This is an expected behavior of the Cisco 1812 routers on-board layer-3 Fast Ethernet interface.

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Configuring Basic Parameters

Configure the ATM WAN Interface

This procedure applies only to the Cisco 1801, Cisco 1802, and Cisco 1803 models.

Perform these steps to configure the ATM interface, beginning in global configuration mode:

Command Purpose

Step 1

For the Cisco 1803 only:

controller dsl 0 mode atm exit

Example:

Router(config)# controller dsl 0 Router(config-controller)# mode atm Router(config-controller)# exit Router(config)#

Chapter 1 Basic Router Configuration

For routers using the G.SHDSL signaling, perform these commands. Ignore this step for routers using ADSL signaling.

Step 2

Step 3

Step 4

Step 5

interface type number

Example:

Router(config)# interface atm0 Router(config-int)#

ip address ip-address mask

Example:

Router(config-int)# ip address

200.200.100.1 255.255.255.0

Router(config-int)#

no shutdown

Example:

Router(config-int)# no shutdown Router(config-int)#

exit

Example:

Router(config-int)# exit Router(config)#

Enters interface configuration mode.

Sets the IP address and subnet mask for the ATM interface.

Enables the ATM 0 interface.

Exits interface configuration mode and returns to global configuration mode.

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Chapter 1 Basic Router Configuration

Configure the Wireless Interface

The wireless interface enables connection to the router through a wireless LAN connection. For more information about configuring a wireless connection, see Chapter 9, “Configuring a Wireless LAN

Connection” and the Cisco Access Router Wireless Configuration Guide.

Configuring a Loopback Interface

The loopback interface acts as a placeholder for the static IP address and provides default routing information.

For complete information on the loopback commands, see the Cisco IOS Release 12.3 documentation set.

Perform these steps to configure a loopback interface:

Command Purpose

Step 1

interface type number

Configuring Basic Parameters

Enters interface configuration mode.

Example:

Router(config)# interface Loopback 0 Router(config-int)#

Step 2

Step 3

ip address ip-address mask

Example:

Router(config-int)# ip address 10.108.1.1

255.255.255.0

Router(config-int)#

exit

Example:

Router(config-int)# exit Router(config)#

Configuration Example

The loopback interface in this sample configuration is used to support Network Address Translation (NAT) on the virtual-template interface. This configuration example shows the loopback interface configured on the Fast Ethernet interface with an IP address of 200.200.100.1/24, which acts as a static IP address. The loopback interface points back to virtual-template1, which has a negotiated IP address.

! interface loopback 0 ip address 200.200.100.1 255.255.255.0 (static IP address) ip nat outside ! interface Virtual-Template1 ip unnumbered loopback0 no ip directed-broadcast ip nat outside

Sets the IP address and subnet mask for the loopback interface.

Exits configuration mode for the loopback interface and returns to global configuration mode.

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Configuring Basic Parameters

Verifying Your Configuration

To verify that you have properly configured the loopback interface, enter the show interface loopback command. You should see verification output similar to the following example.

Router# show interface loopback 0 Loopback0 is up, line protocol is up Hardware is Loopback Internet address is 200.200.100.1/24 MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation LOOPBACK, loopback not set Last input never, output never, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/0, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out

Chapter 1 Basic Router Configuration

Another way to verify the loopback interface is to ping it:

Router# ping 200.200.100.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 200.200.100.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

Configuring Command-Line Access to the Router

Perform these steps to configure parameters to control access to the router, beginning in global configuration mode:

Command Purpose

Step 1

Step 2

line [aux | console | tty | vty] line-number

Example:

Router(config)# line console 0 Router(config)#

password password

Example:

Router(config)# password 5dr4Hepw3 Router(config)#

Enters line configuration mode, and specifies the type of line.

This example specifies a console terminal for access.

Specifies a unique password for the console terminal line.

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Specifications and Main Features

Frequently Asked Questions

User Manual

Cisco 1800 Series Integrated Services Router (Fixed) Software Installation Guide

CONTENTS

Preface

Audience

Organization

Conventions

Notes, Cautions, and Timesavers

Command Conventions

Related Documents

Obtaining Documentation

Cisco.com

Documentation DVD

Ordering Documentation

Documentation Feedback

Cisco Product Security Overview

Obtaining Technical Assistance

Reporting Security Problems in Cisco Products

Cisco Technical Support Website

Submitting a Service Request

Definitions of Service Request Severity

Obtaining Additional Publications and Information

Getting Started

Basic Router Configuration

Interface Port Labels

Viewing the Default Configuration

Information Needed for Configuration

Configuring Basic Parameters

Configure Global Parameters

Configure Fast Ethernet LAN Interfaces

Configure WAN Interfaces

Configure the Fast Ethernet WAN Interface

Configure the ATM WAN Interface

Configure the Wireless Interface

Configuring a Loopback Interface

Configuration Example

Verifying Your Configuration

Configuring Command-Line Access to the Router