GNS3 Lab & Exercise: OSPF Hub-And-Spoke & Virtual Links
Written by LBSources from http://www.gns3-labs.com on March 4th, 2010 | 5 CommentsOk - So here is another CCNP BSCI / CCNA lab challenge. This lab is part of Chris Bryant’s CCNP lab manual. I haven’t included the solutions yet - I’ll give it some time and post that later 
.. First work on completing the lab and getting it to all work per the challenge.
Ok OK .. This lab wasn’t really a challenge, I made it a challenge so excuse the format. There are a bunch of other labs soon to follow that will include a better format.
This lab gives you some great hands on with multi-area OSPF, hub-and-spoke areas and configuration of virtual links. Good for CCNP or CCNA candidate.
I used a 3725 router due to some strange issue anytyime I used a 3640 for R5. Feel free to use a 3640 instead.
Routers Used:3640 & 3725
IOS:c3640-ik9o3s-mz.124-17a & c3725-adventerprisek9-mz.124-15.T10
Feature of Topology: Multi-Area OSPF, Hub-and-Spoke & Virtual Links
Image: 
Lab Objectives
Lab Objectives
1
-Configure OSPF on R1, R2 and R3 serial interfaces into Area 0
***Prevent R2 and R3 from participating in the DR and BDR election
-Are neighbor statements required on R1? You decide..
-Advertise R1’s loopback interface into Area 1
-Advertise R2’s loopback interface into Area 2
-Advertise R3’s loopback interface into Area 3
-Confirm that all intended adjacencies have formed
-Ping the loopbacks of R2 and R3 from R1
-Ping R1’s loopback from R2 and R3
2
-Set the hello timer on R1, R2 and R3 to 5 seconds
-Shutdown the serial interface on R1
-Check the for neighbors on R2 and R3
-Bring the serial interface on R1 back up
-Check the for neighbors on R2 and R3
3
-Change the OSPF RID on R1 to 11.11.11.11 and apply it
-Change the OSPF RID on R2 to 22.22.22.22 and apply it
-Change the OSPF RID on R3 to 33.33.33.33 and apply it
-Reload the OSPF process
-Is anything different?
4
-Create a serial connection between R3 and R4
-Make R3 the DCE with a clockrate of 64kpbs
-Configure R3’s serial interface with an IP of 10.2.2.3
-Configure R4’s serial interface with an IP of 10.2.2.4
-Configure a loopback 0 interface on R4 with an IP of 4.4.4.4
-Ensure connectivity
5
-Configure R3 to advertise the 10.2.2.0 network into OSPF area 34
-Configure R4 to advertise the 10.2.2.0 network into OSPF area 34
-Configure R4 to advertise the 4.4.4.4 into OSPF area 4
-Verify adjacency
6
-Review the routing table of R3 - specifically routes to R4 - Are they all there?
-Create a virtual-link between R3 and R4 using Area 34 as the transit area
***Check neighbor RIDs before doing so.
-Confirm the creation of the virual-link
Download: GNS3-Labs - BSCI Lab - OSPF Hub-And-Spoke & Virtual Links
Cheers and Happy Labbing!
LBS
Tags: BSCI, CCNP, CCNP ROUTE, Chris Bryant, GNS3 Lab and Exercise, GNS3 Topology, Multiarea OSPF, OSPF, Virtual Area Links
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April 8th, 2010 at 10:45 am
Hello,
I try to do this lab but I have problems whith part 1 any adjacencies have formed :s (I used a 2691 router).
Please If it possible gave me some information.
Thinks !
April 9th, 2010 at 9:10 am
@yahya So what have you done so far? Can you post your configs to pastebin somewhere so we can look at them?
April 12th, 2010 at 6:55 am
hello
ok I was configure the first part on this lab, I configure interface serial into area 0, I prevent router to participate in DR and BDR election and I configure loopback interface but no adjacencies have formed.
you can find router configurations in this link :
http://www.4shared.com/file/EsiHDKTd/OSPF_configs.html
Thinks.
April 13th, 2010 at 10:10 pm
@yahya Remember that this network topology will default to NBMA, which means? You must specify the neighbors that the hub will form adjacencies with using the neighbor command. Unless you reconfigure the network type to and broadcast type, which I don’t recommend nor is the expected configuration to the lab. I’ll post the final configs tomorrow.
Look at the challenge steps..
1
-Configure OSPF on R1, R2 and R3 serial interfaces into Area 0
***Prevent R2 and R3 from participating in the DR and BDR election
-Are neighbor statements required on R1? You decide..
April 15th, 2010 at 6:58 am
hi
I resolve this probleme by using this commande in serial interface :
ip ospf network point-to-multupoint
Thank You !