BSCI Module 2-Lesson 2 Edited

8/6/2019 BSCI Module 2-Lesson 2 Edited

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

Configuring EIGRP

BSCI Module 2-2 ± Implementing and Verifying EIGRP




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

task

Explain 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




Purpose of this Lesson

Coverage of topics new to the ³EIGRP´ module of BSCI.

What¶s 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.




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-mask is an inverse mask used todetermine how to interpret the address. The mask haswildcard bits, where 0 is a match and 1 is ³don¶t care.´

R outer(config)#

R outer(config-router)#




Configuring EIGRP (Cont.)

band wid th kilobits

Defines the interface¶s bandwidth for the pur poses of

sending routing update traffic.

R outer(config-if)#




Configuring EIGRP for IP

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




Configuring EIGRP with IP (cont.)

Classful configuration example:

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

routerA(config-router)#n

etwork 172.16.7.0routerA(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




Using the Wildcard Mask in EIGRP




Using and Configuring the ip default-networkcommand for EIGRP




Example R1 EIGRP Configuration




R2 EIGRP Configuration

<output omitted>

interface FastEthernet0/0

ip add ress 172.17.2.2 255.255.255.0

<output omitted>

interface Serial0/0/1 band wid th 64

ip add ress 192.168.1.102 255.255.255.224

<output omitted>

router eigrp 100

network 172.17.2.0 0.0.0.255

network 192.168.1.0




Verifying EIGRP: show ip eigrp neigh bors

R 1#show ip eigrp neigh bors

IP-EIGR P neigh bors for process 100

H A dd ress Interface Hold Uptime SRTT RTO Q Seq

(sec) (m s) Cnt Num

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




Verifying EIGRP: show ip routeeigrp

R 1#show ip route eigrp

D 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 su bnetted , 2 su bnets, 2 m asks

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



R 1#show ip route <output omitted>

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 d irectly connected , FastEthernet0/0

192.168.1.0/24 is variably su bnetted , 2 su bnets, 2 m asksC 192.168.1.96/27 is d irectly connected , Serial0/0/1





Verifying EIGRP: show ip protocols

R 1#show ip protocols

R outing Protocol is "eigrp 100"

Outgoing upd ate filter list for all interfaces is not set

Incoming upd ate filter list for all interfaces is not set

Default networks flagged in outgoing upd ates

Default networks accepted from incoming upd ates

EIGR P metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGR P m aximum hopcount 100EIGR P m aximum metric variance 1

R ed istri buting: eigrp 100

EIGR P NSF-a ware route hold timer is 240s

<output omitted>

M aximum path: 4

R outing for Networks:

172.16.1.0/24192.168.1.0

R outing Inform ation Sources:

Gateway Distance Last Upd ate

(this router) 90 00:09:38

Gateway Distance Last Upd ate

192.168.1.102 90 00:09:40

Distance: internal 90 external 170




Verifying EIGRP: show ip eigrpinterfaces

R 1#show ip eigrp interfaces

IP-EIGR P interfaces for process 100

Xmit Queue M ean Pacing Time M ulticast Pend ing

Interface Peers Un/R eliable SRTT Un/R eliable Flow Timer R outes

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

R 1#show ip eigrp topology

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

Cod es: P - Passive, A - Active, U - Upd ate, Q - Query, R - R eply,

r - reply Status, s - sia Status

P 192.168.1.96/27, 1 successors, FD is 40512000

via Connected , Serial0/0/1

P 192.168.1.0/24, 1 successors, FD is 40512000via Summ ary (40512000/0), Null0


via Summ ary (28160/0), Null0


via Connected , FastEthernet0/0


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




Verifying EIGRP: show ip eigrptraffic

R 1#show ip eigrp traffic

IP-EIGR P Traffic Statistics for AS 100

Hellos sent/received : 429/192

Upd ates sent/received : 4/4

Queries sent/received : 1/0

R eplies sent/received : 0/1

Acks sent/received : 4/3In put queue high water m ark 1, 0 d rops

SI A-Queries sent/received : 0/0

SI A-R eplies sent/received : 0/0

Hello Process ID: 113

PD M Process ID: 73




Summary

The configuration commands for basic EIGRP include:

router eigrp autonomous-system

network network-num ber [wild card -m ask]

band wid th kilo bits

The optional wildcard-mask parameter in the networkcommand is an inverse mask used to determine how tointer pret the network-number. A wildcard bit of 0 is amatch and of 1 is ³don¶t care´.

Create and advertise a default route in an EIGRPautonomous system with the ip d efault-networknetwork-num ber command.




Summary (cont.)

Use the show ip eigrp neigh bors command to

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

router recognizes routes from its neighbors.

Use the show ip protocols, show ip eigrpinterfaces, show ip eigrp neigh bors, showip eigrp topology, and show ip eigrptraffic commands 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 neigh bors, 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/ps18

28/products_command_reference_chapter09186a00800ca5a9.html

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

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BSCI Module 2-Lesson 2 Edited

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