Cisco 857, 876, 877, 878, 851 Access Routers Software Configuration Guide

...

Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration

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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

Preface 11

PART

1 Getting Started

Audience 11

Organization 12

Conventions 13

Notes, Cautions, and Timesavers 13 Command Conventions 13

Audience

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

• Organization

• Conventions

• Related Documents

• Obtaining Documentation and Submitting a Service Request

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.

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.

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Cisco 850 Series and Cisco 870 Series Access Routers 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

This guide contains the following information:

Part 1: Getting Started

• Chapter 1, “Basic Router Configuration”—Describes how to configure basic router features and

Part 2: Configuring Your Router for Ethernet and DSL Access

• Chapter 2, “Sample Network Deployments”—Provides a road map for Part 2.

• Chapter 3, “Configuring PPP over Ethernet with NAT”—Provides instructions on how to configure

• Chapter 4, “Configuring PPP over ATM with NAT”—Provides instructions on how to configure

• Chapter 5, “Configuring a LAN with DHCP and VLANs”—Provides instructions on how to

• Chapter 6, “Configuring a VPN Using Easy VPN and an IPSec Tunnel”—Provides instructions on

Preface

interfaces.

PPPoE with Network Address Translation (NAT) on your Cisco router.

PPPoA with Network Address Translation (NAT) on your Cisco router.

configure your Cisco router with multiple VLANs and to have it act as a DHCP server.

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

• Chapter 7, “Configuring VPNs Using an IPSec Tunnel and Generic Routing

Encapsulation”—Provides instructions on how to configure a VPN with a secure IP tunnel and

generic routing encapsulation (GRE).

• Chapter 8, “Configuring a Simple Firewall”—Provides instructions on how to configure a basic

firewall on your Cisco router.

• Chapter 9, “Configuring a Wireless LAN Connection”—Provides instructions on how to configure

a wireless LAN connection on your Cisco router.

• Chapter 10, “Sample Configuration”—Presents a summary configuration example showing features

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

Part 3: Configuring Additional Features and Troubleshooting

• 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, including firewall and VPN configuration.

• Chapter 13, “Configuring Dial Backup and Remote Management”—Provides instructions on how to

configure your Cisco router for dial backup and remote management.

• Chapter 14, “Troubleshooting”—Provides information on identifying and solving problems with the

ADSL line and the telephone interface. Also explains how to recover a lost software password.

Part 4: Reference Information

• Appendix A, “Cisco IOS Software Basic Skills”—Explains what you need to know about Cisco IOS

software before you begin to configure it.

• Appendix B, “Concepts”—Provides general concept explanations of features.

• Appendix C, “ROM Monitor”—Describes the use of the ROM Monitor (ROMMON) utility.

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Preface

• Appendix D, “Common Port Assignments”—Describes the currently assigned Transmission

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

• Index

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.

Conventions

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.

Timesaver This symbol means the described action saves time.

Command Conventions

Table 1 describes the command syntax used in this guide.

Ta b l e 1 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 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s revised Cisco

technical documentation, at:

New in Cisco Product Documentation, which also lists all new and

Preface

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

Subscribe to the What’s New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service and Cisco currently supports RSS

Ve r si o n 2.0.

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ART

Getting Started

CHA P TER

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 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.

Ta b l e 1-1 Supported Interfaces and Associated Port Labels by Cisco Router

Router Interface Port Label

Cisco 851 Fast Ethernet LAN LAN (top), FE0–FE3 (bottom)

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Fast Ethernet WAN WAN (top), FE4 (bottom)

Wireless LAN (no label)

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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 871 Fast Ethernet LAN FE0–FE3

Cisco 857 Fast Ethernet LAN LAN (top), FE0–FE3 (bottom)

Cisco 876 Fast Ethernet LAN LAN (top), FE0–FE3 (bottom)

Cisco 877 Fast Ethernet LAN LAN (top), FE0–FE3 (bottom)

Cisco 878 Fast Ethernet LAN FE0–FE3

Chapter 1 Basic Router Configuration

Fast Ethernet WAN FE4

Wireless LAN LEFT, RIGHT/PRIMARY

USB 1–0

ATM WA N ADSLoPOTS

Wireless LAN (no label)

ATM WA N ADSLoISDN

Wireless LAN LEFT, RIGHT/PRIMARY

BRI ISDN S/T

ATM WA N ADSLoPOTS

Wireless LAN LEFT, RIGHT/PRIMARY

ATM WA N G.SHDSL

Wireless LAN LEFT, RIGHT/PRIMARY

BRI ISDN S/T

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 to view the initial configuration, as shown in

Example 1-1 Cisco 851 Default Configuration on Startup

Router# show running-config Building configuration...

Current configuration : 1090 bytes ! version 12.3 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker !

running-config command

Example 1-1.

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Chapter 1 Basic Router Configuration

no aaa new-model ip subnet-zero !

ip cef ip ips po max-events 100 no ftp-server write-enable ! interface FastEthernet0 no ip address shutdown ! interface FastEthernet1 no ip address shutdown ! interface FastEthernet2 no ip address shutdown ! interface FastEthernet3 no ip address shutdown ! interface FastEthernet4 no ip address duplex auto speed auto ! interface Dot11Radio0 no ip address shutdown speed basic-1.0 basic-2.0 basic-5.5 6.0 9.0 basic-11.0 12.0 18.0 24.0 36.0 48.0

54.0 rts threshold 2312 station-role root ! interface Vlan1 no ip address ! ip classless ! no ip http server no ip http secure-server ! control-plane ! line con 0 no modem enable transport preferred all transport output all line aux 0 transport preferred all transport output all line vty 0 4 login transport preferred all transport input all transport output all ! end

Viewing the Default Configuration

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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.

Chapter 1 Basic Router Configuration

–

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.

–

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:

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.

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Chapter 1 Basic Router Configuration

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.

Configure Global Parameters

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

Configuring Basic Parameters

Step 1

Step 2

Step 3

Step 4

Command Purpose

configure terminal

Enters global configuration mode, when using the console port.

Example:

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

hostname name

Example:

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

enable secret password

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

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)#

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

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Configuring Basic Parameters

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.”

Configure WAN Interfaces

The Cisco 851 and Cisco 871 routers each have one Fast Ethernet interface for WAN connection. The

857, Cisco 877, and Cisco 878 routers each have one ATM interface for WAN connection.

Cisco

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

Chapter 1 Basic Router Configuration

Configure the Fast Ethernet WAN Interface

This procedure applies only to the Cisco 851 and Cisco 871 router models. Perform these steps to configure the Fast Ethernet interface, beginning in global configuration mode:

Command Purpose

Step 1

Step 2

Step 3

interface type number

Example:

Router(config)# interface fastethernet 4 Router(config-int)#

ip address ip-address mask

Example:

Router(config-int)# ip address 192.168.12.2

255.255.255.0

Router(config-int)#

no shutdown

Example:

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

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

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

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

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Step 4

Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

exit

Example:

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

Exits configuration mode for the Fast Ethernet interface and returns to global configuration mode.

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Chapter 1 Basic Router Configuration

Configure the ATM WAN Interface

This procedure applies only to the Cisco 857, Cisco 876, Cisco 877 and Cisco 878 models.

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

Command Purpose

Step 1

For the Cisco 878 model only:

controller dsl 0 mode atm exit

Example:

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

Configuring Basic Parameters

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 10.10.10.100

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)#

Identifies and enters the configuration mode for an ATM interface.

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

Enables the ATM 0 interface.

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

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

Connection,” and the Cisco Access Router Wireless Configuration Guide.

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Chapter 9, “Configuring a Wireless LAN

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Configuring Basic Parameters

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

set.

Step 1

documentation

Perform these steps to configure a loopback interface:

Command Purpose

interface type number

Example:

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

Chapter 1 Basic Router Configuration

Enters configuration mode for the loopback interface.

Step 2

ip address ip-address mask

Example:

Router(config-int)# ip address 10.108.1.1

255.255.255.0

Router(config-int)#

Step 3

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 10.10.10.100/24, 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 10.10.10.100 255.255.255.0 (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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Chapter 1 Basic Router Configuration

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 10.10.10.100/24 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

Configuring Basic Parameters

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

Router# ping 10.10.10.100 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.10.100, 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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Configuring Basic Parameters

Command Purpose

Step 3

Example:

Router(config)# login Router(config)#

Chapter 1 Basic Router Configuration

Enables password checking at terminal session login.

Step 4

Step 5

Step 6

Step 7

exec-timeout minutes [seconds]

Example:

Router(config)# exec-timeout 5 30 Router(config)#

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

Example:

Router(config)# line vty 0 4 Router(config)#

password password

Example:

Router(config)# password aldf2ad1 Router(config)#

Example:

Router(config)# login Router(config)#

Sets the interval that the EXEC command interpreter waits until user input is detected. The default is 10 minutes. Optionally, add seconds to the interval value.

This example shows a timeout of 5 minutes and 30

seconds. Entering a timeout of 0 0 specifies

never to time out.

Specifies a virtual terminal for remote console access.

Specifies a unique password for the virtual terminal line.

Enables password checking at the virtual terminal session login.

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Step 8

end

Exits line configuration mode, and returns to privileged EXEC mode.

Example:

Router(config)# end Router#

For complete information about the command line commands, see the Cisco IOS Release 12.3 documentation set.

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Chapter 1 Basic Router Configuration

Configuration Example

The following configuration shows the command-line access commands.

You do not need to input the commands marked “default.” These commands appear automatically in the configuration file generated when you use the show running-config command.

! line con 0 exec-timeout 10 0 password 4youreyesonly login transport input none (default) stopbits 1 (default) line vty 0 4 password secret login !

Configuring Static Routes

Step 1

Step 2

Static routes provide fixed routing paths through the network. They are manually configured on the router. If the network topology changes, the static route must be updated with a new route. Static routes are private routes unless they are redistributed by a routing protocol. Configuring static routes on the

850 and Cisco 870 series routers is optional.

Cisco

Perform these steps to configure static routes, beginning in global configuration mode:

Command Purpose

ip route prefix mask {ip-address | interface-type interface-number [ip-address]}

Example:

Router(config)# ip route 192.168.1.0

255.255.0.0 10.10.10.2

Router(config)#

end

Specifies the static route for the IP packets.

For details about this command and additional parameters that can be set, see the

Cisco IOS IP

Command Reference, Volume 2 of 4: Routing Protocols.

Exits router configuration mode, and enters privileged EXEC mode.

Example:

Router(config)# end Router#

For complete information on the static routing commands, see the Cisco IOS Release 12.3 documentation set. For more general information on static routing, see

Appendix B, “Concepts.”

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Configuring Dynamic Routes

Configuration Example

In the following configuration example, the static route sends out all IP packets with a destination IP address of 192.168.1.0 and a subnet mask of 255.255.255.0 on the Fast Ethernet interface to another device with an IP address of 10.10.10.2. Specifically, the packets are sent to the configured PVC.

You do not need to enter the commands marked “(default).” These commands appear automatically in the configuration file generated when you use the show running-config command.

! ip classless (default) ip route 192.168.1.0 255.255.255.0 10.10.10.2!

Verifying Your Configuration

To verify that you have properly configured static routing, enter the show ip route command and look for static routes signified by the “S.”

You should see verification output similar to the following example.

Router# show ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route

Chapter 1 Basic Router Configuration

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 1 subnets C 10.108.1.0 is directly connected, Loopback0 S* 0.0.0.0/0 is directly connected, FastEthernet0

Configuring Dynamic Routes

In dynamic routing, the network protocol adjusts the path automatically, based on network traffic or topology. Changes in dynamic routes are shared with other routers in the network.

The Cisco routers can use IP routing protocols, such as Routing Information Protocol (RIP) or Enhanced Interior Gateway Routing Protocol (EIGRP), to learn routes dynamically. You can configure either of these routing protocols on your router.

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Chapter 1 Basic Router Configuration

Configuring RIP

Perform these steps to configure the RIP routing protocol on the router, beginning in global configuration mode:

Command Task

Step 1

router rip

Example:

Router> configure terminal Router(config)# router rip Router(config-router)#

Configuring Dynamic Routes

Enters router configuration mode, and enables RIP on the router.

Step 2

Step 3

Step 4

Step 5

version {1 | 2}

Example:

Router(config-router)# version 2 Router(config-router)#

network ip-address

Example:

Router(config-router)# network 192.168.1.1 Router(config-router)# network 10.10.7.1 Router(config-router)#

no auto-summary

Example:

Router(config-router)# no auto-summary Router(config-router)#

end

Example:

Router(config-router)# end Router#

Specifies use of RIP version 1 or 2.

Specifies a list of networks on which RIP is to be applied, using the address of the network of directly connected networks.

Disables automatic summarization of subnet routes into network-level routes. This allows subprefix routing information to pass across classful network boundaries.

Exits router configuration mode, and enters privileged EXEC mode.

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For complete information on the dynamic routing commands, see the Cisco IOS Release 12.3 documentation set. For more general information on RIP, see

Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

Appendix B, “Concepts.”

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Configuring Enhanced IGRP

Configuration Example

The following configuration example shows RIP version 2 enabled in IP network 10.0.0.0 and

192.168.1.0.

Execute the show running-config command from privileged EXEC mode to see this configuration.

! router rip version 2 network 10.0.0.0 network 192.168.1.0 no auto-summary !

Verifying Your Configuration

To verify that you have properly configured RIP, enter the show ip route command and look for RIP routes signified by “R.” You should see a verification output like the example shown below.

Chapter 1 Basic Router Configuration

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 1 subnets C 10.108.1.0 is directly connected, Loopback0 R 3.0.0.0/8 [120/1] via 2.2.2.1, 00:00:02, Ethernet0/0

Configuring Enhanced IGRP

Perform these steps to configure Enhanced IGRP (EIGRP), beginning in global configuration mode:

Command Purpose

Step 1

router eigrp as-number

Example:

Router(config)# router eigrp 109 Router(config)#

Enters router configuration mode, and enables EIGRP on the router. The autonomous-system number identifies the route to other EIGRP routers and is used to tag the EIGRP information.

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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

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+ 166 hidden pages

Cisco 857, 876, 877, 878, 851 Access Routers Software Configuration Guide

CONTENTS

Audience

Organization

Conventions

Notes, Cautions, and Timesavers

Command Conventions

Related Documents

Obtaining Documentation and Submitting a Service Request

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

Configuration Example

Configuring Static Routes

Configuring Dynamic Routes

Configuration Example

Verifying Your Configuration

Configuring RIP

Configuring Enhanced IGRP

Configuration Example

Verifying Your Configuration