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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
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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
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Chapter 1
Basic Router Configuration
Configuring Enhanced IGRP
Page 33 / 196
P
A R T
2
Configuring Your Router for Ethernet and
DSL Access
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C H A P T E R
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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
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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”

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