02-Implementing and Verifying EIGRP

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2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialROUTE 2 - 2 1

Configuring EIGRP

ROUTE Module 2-2Implementing and Verifying EIGRP


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Objectives

Upon completing this lesson, you will be able todescribe how to implement EIGRP routing. This abilityincludes being able to meet these objectives:

Describe the commands used in a basic EIGRP configuration

taskExplain how to configure a router to use wildcard masks toselect the interfaces and networks that will participate in EIGRProuting

Configure the gateway of last resort or default route

Verify that the router recognizes EIGRP neighbors and routes

Verify EIGRP operations


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Purpose of this Lesson

Coverage of topics new to the EIGRP module of ROUTE.

Whats new in this module?

Describe the commands used in a basic EIGRP configuration task

Explain how to configure a router to use wildcard masks to selectthe interfaces and networks that will participate in EIGRP routing

Configure the gateway of last resort or default route.


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Configuring EIGRP

router eigrp autonomous-system-number

Defines EIGRP as the IP routing protocol.

All routers in the internetwork that must exchange EIGRProuting updates must have the same autonomous systemnumber.

network network-number [wildcard-mask]

Identifies attached networks participating in EIGRP.

The wildcard-maskis an inverse mask used todetermine how to interpret the address. The mask haswildcard bits, where 0 is a match and 1 is dont care.

Router(config)#

Router(config-router)#


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Configuring EIGRP (Cont.)

bandwidth kilobits

Defines the interfaces bandwidth for the purposes of

sending routing update traffic.

Router(config-if)#


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Configuring EIGRP for IP

Network 192.168.1.0 is not configured on router A,because it is not directly connected to router A.


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Configuring EIGRP with IP (cont.)

Classful configuration example:

routerA(config)#router eigrp 109routerA(config-router)#network 10.1.0.0routerA(config-router)#network 10.4.0.0routerA(config-router)#network 172.16.7.0

routerA(config-router)#network 172.16.2.0

Classless configuration example:

routerA(config)#router eigrp 109routerA(config-router)#network 10.1.0.0 0.0.255.255

routerA(config-router)#network 10.4.0.0 0.0.255.255routerA(config-router)#network 172.16.2.0 0.0.0.255routerA(config-router)#network 172.16.7.0 0.0.0.255


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Using the Wildcard Mask in EIGRP


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Using and Configuring the ip default-networkcommand for EIGRP


10/24 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialROUTE 2 - 2 10

Example R1 EIGRP Configuration



R2 EIGRP Configuration

interface FastEthernet0/0

ip address 172.17.2.2 255.255.255.0

interface Serial0/0/1

bandwidth 64

ip address 192.168.1.102 255.255.255.224

router eigrp 100

network 172.17.2.0 0.0.0.255

network 192.168.1.0



Verifying EIGRP: show ip eigrp neighbors

R1#show ip eigrp neighbors

IP-EIGRP neighbors for process 100

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 192.168.1.102 Se0/0/1 10 00:07:22 10 2280 0 5

R1#



Verifying EIGRP: show ip routeeigrp

R1#show ip route eigrpD 172.17.0.0/16 [90/40514560] via 192.168.1.102, 00:07:01, Serial0/0/1

172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks

D 172.16.0.0/16 is a summary, 00:05:13, Null0



R1#show ip route

Gateway of last resort is not set

D 172.17.0.0/16 [90/40514560] via 192.168.1.102, 00:06:55, Serial0/0/1



C 172.16.1.0/24 is directly connected, FastEthernet0/0

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masksC 192.168.1.96/27 is directly connected, Serial0/0/1




Verifying EIGRP: show ip protocols

R1#show ip protocolsRouting Protocol is "eigrp 100"

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

Default networks flagged in outgoing updates

Default networks accepted from incoming updates

EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 100

EIGRP NSF-aware route hold timer is 240s

Maximum path: 4

Routing for Networks:

172.16.1.0/24192.168.1.0

Routing Information Sources:

Gateway Distance Last Update

(this router) 90 00:09:38

Gateway Distance Last Update

192.168.1.102 90 00:09:40

Distance: internal 90 external 170



Verifying EIGRP: show ip eigrpinterfaces

R1#show ip eigrp interfaces

IP-EIGRP interfaces for process 100

Xmit Queue Mean Pacing Time Multicast Pending

Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes

Fa0/0 0 0/0 0 0/10 0 0

Se0/0/1 1 0/0 10 10/380 424 0



Verifying EIGRP: show ip eigrptopology

R1#show ip eigrp topology

IP-EIGRP Topology Table for AS(100)/ID(192.168.1.101)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

r - reply Status, s - sia Status

P 192.168.1.96/27, 1 successors, FD is 40512000

via Connected, Serial0/0/1


via Summary (40512000/0), Null0


via Summary (28160/0), Null0


via Connected, FastEthernet0/0


via 192.168.1.102 (40514560/28160), Serial0/0/1



Verifying EIGRP: show ip eigrptraffic

R1#show ip eigrp traffic

IP-EIGRP Traffic Statistics for AS 100

Hellos sent/received: 429/192

Updates sent/received: 4/4

Queries sent/received: 1/0

Replies sent/received: 0/1

Acks sent/received: 4/3

Input queue high water mark 1, 0 drops

SIA-Queries sent/received: 0/0

SIA-Replies sent/received: 0/0

Hello Process ID: 113

PDM Process ID: 73



Summary

The configuration commands for basic EIGRP include:router eigrp autonomous-system

network network-number [wildcard-mask]

bandwidth kilobits

The optional wildcard-mask parameter in the networkcommand is an inverse mask used to determine how tointerpret the network-number. A wildcard bit of 0 is amatch and of 1 is dont care.

Create and advertise a default route in an EIGRPautonomous system with the ip default-networknetwork-numbercommand.



Summary (cont.)

Use the show ip eigrp neighborscommand to

verify that the router recognizes its neighbors. Use theshow ip route eigrpcommand to verify that the

router recognizes routes from its neighbors.

Use the show ip protocols, show ip eigrpinterfaces, show ip eigrp neighbors, showip eigrp topology, and show ip eigrptrafficcommands to verify EIGRP operations.

.



Activity

Create a simple network using EIGRP as your routingprotocol. These steps were discussed at the beginningof this module.

Verify your connections by running the showcommands discussed in the module:

show ip protocols, show ip eigrp interfaces, showip eigrp neighbors, show ip eigrp topology, andshow ip eigrp traffic

Reflection: Are your routes displayed correctly in therouting table and identified as both directly connectedor EIGRP?



Self Check

Which show command verifies the router can recognizeits neighbors?

Show ip route eigrphas what function?

What command establishes EIGRP as the routingprotocol?

Identify the command to create and advertise a defaultroute in an EIGRP autonomous system.



Resources

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009405c.shtml

http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_command_reference_chapter09186a00800ca5a9.html

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml

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Q and A


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02-Implementing and Verifying EIGRP