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

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Chapter 1

Basic Router Configuration

Configuring Enhanced IGRP

For complete information on the IP EIGRP commands, see the Cisco IOS Release 12.3 documentation

set. For more general information on EIGRP concepts, see

Appendix B, “Concepts.”

Configuration Example

The following configuration example shows the EIGRP routing protocol enabled in IP networks

192.145.1.0 and 10.10.12.115. The EIGRP autonomous system number is 109.

Execute the

show running-config

command from privileged EXEC mode to see this configuration.

!

router eigrp 109

network 192.145.1.0

network 10.10.12.115

!

Verifying Your Configuration

To verify that you have properly configured IP EIGRP, enter the

show ip route

command, and look for

EIGRP routes indicated by “D.” 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

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

D

3.0.0.0/8 [90/409600] via 2.2.2.1, 00:00:02, Ethernet0/0

Step 2

network

ip-address

Example:

Router(config)#

network 192.145.1.0

Router(config)#

network 10.10.12.115

Router(config)#

Specifies a list of networks on which EIGRP is to

be applied, using the IP address of the network of

directly connected networks.

Step 3

end

Example:

Router(config-router)#

end

Router#

Exits router configuration mode, and enters

privileged EXEC mode.

Command

Purpose

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

OL-5332-01

Chapter 1

Basic Router Configuration

Configuring Enhanced IGRP

Configuring Your Router for Ethernet and

DSL Access

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

OL-5332-01

2

Sample Network Deployments

This part of the software configuration guide presents a variety of possible Ethernet- and Digital

Subscriber Line (DSL)-based network configurations using the Cisco 850 and Cisco 870 series access

routers. Each scenario is described with a network topology, a step-by-step procedure that is used to

implement the network configuration, and a configuration example that shows the results of the

configuration. The Cisco 851 and Cisco 871 router models can be used in the Ethernet-based scenarios

and the Cisco 857, Cisco 876, Cisco 877, and Cisco 878 router models can be used in the DSL-based

scenarios.

The first network scenario provides a simple network configuration: point-to-point protocol (PPP) over

the WAN interface with Network Address Translation (NAT). Each successive scenario builds on the

previous scenario by configuring another key feature.

The scenarios do not address all of the possible network needs; instead, they provide models on which

you can pattern your network. You can choose not to use features presented in the examples, or you can

add or substitute features that better suit your needs.

Note

To verify that a specific feature is compatible with your router, you can use the Software Advisor tool.

You can access this tool at

www.cisco.com > Technical Support & Documentation > Tools &

Resources

with your Cisco username and password.

For Ethernet-Based Network Deployments

Use the following configuration examples to assist you in configuring your router for Ethernet-based

networks.

•

Chapter 3, “Configuring PPP over Ethernet with NAT”

•

Chapter 5, “Configuring a LAN with DHCP and VLANs”

•

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”

For DSL-Based Network Deployments

Use the following configuration examples to assist you in configuring your router for DSL-based

networks.

•

Chapter 4, “Configuring PPP over ATM with NAT”

•

Chapter 5, “Configuring a LAN with DHCP and VLANs”

•

Chapter 6, “Configuring a VPN Using Easy VPN and an IPSec Tunnel”