Saturday, December 20, 2008

CCNA EIGRP LAB Question

Question:

After adding R3 router, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly.
The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.

Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are cisco.

IP addresses are listed in the chart below.

ccna_eigrp_sim

R1

Fa0/0: 192.168.77.33
S1/0: 198.0.18.6
S0/1: 192.160.60.25

R2

Fa0/0: 192.168.60.97
Fa0/1: 192.168.60.113
S0/0: 192.168.36.14

R3

Fa0/0: 192.168.77.34
Fa0/1: 192.168.60.65
Fa1/0: 192.168.60.81

R4

Fa0/0: 192.168.60.129
Fa0/1: 192.168.60.145
S0/1: 192.168.60.26

Answer and explanation:



We should check the configuration of the new added router first because it does not function properly while others work well. From the command line interface of R3 router, enter the show running-config command

ccna_eigrp_sim_show_run

From the output above, we know that this router was wrongly configured with an autonomous number (AS) of 22. When the AS numbers among routers are mismatched, no adjacency is formed.
(You should check the AS numbers on other routers for sure)

To solve this problem, we simply re-configure router R3 with the following commands:

R3>enable (you have to enter cisco as its password here)
R3#configure terminal
R3(config)#no router eigrp 22
R3(config)#router eigrp 212
R3(config-router)#network 192.168.60.0
R3(config-router)#network 192.168.77.0
R3(config-router)#no auto-summary
R3(config-router)#end
R3#copy running-config startup-config

Check R1 router with the show running-config command:

ccna_eigrp_sim_show_run_2

Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router

R1>enable (you have to enter cisco as its password here)
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)#network 192.168.77.0
R1(config-router)#end
R1#copy running-config startup-config

Now the whole network will work well. You should check again with ping command from router R3 to other routers!

CCNA: Cisco Certified Network Associate: Fast Pass



Organized by exam objectives, this is a focused, concise review guide that works hand-in-hand with any learning tool, including the Sybex CCNA: Cisco Certified Network Associate Study Guide, 6th and Deluxe editions.

The book will consist of four high-level chapters, each mapping to the four main Domains of the exam skill-set. The book will drill down into the specifics of the exam, covering the following:

* Designing Cisco internetworks
* Developing an access list
* Evaluating TCP/IP communication
* Configuring routers and switches
* Configuring IP addresses, subnet masks, and gateway addresses
* Performing LAN, VLAN, and WAN troubleshooting
* Understanding rules for packet control

The interactive CD contains two bonus exams, handy flashcard questions, and a searchable PDF of a Glossary of Terms.

The perfect companion to Sybex's CCNA: Cisco Certified Network Associate Study Guide, Sixth or Deluxe editions, or any CCNA study tool

The Perfect CCNA Preparation and Review Tool

Many candidates who complete a Study Guide or course also appreciate a review tool that helps them brush up on key topics. Sybex's CCNA Fast Pass, Third Edition, is that tool. This streamlined book hones in on critical information for the new CCNA exam 640-802, including network planning and design, implementation and operation, troubleshooting, and technology. Study, review, and practice with this practical study aid, then take the exam with confidence.

* Easy-to-use book is organized by exam objectives for quick review
* Flexible Fast Pass goes hand-in-hand with any learning tool on the market
* Exam Essentials in each chapter helps you zero in on what you need to know
* Book includes review questions, practice tools, and two practice exams
* Targeted and expert content from leading Cisco networking authority, Todd Lammle

Look inside for complete review coverage of all exam objectives for CCNA Exam 640-802


Download here (8.3M pdf)