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GT ECE 4110 - OSPF and Fixing Broken Networks

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1ECE 4110 Internetwork ProgrammingLab 8: OSPF and Fixing Broken NetworksGroup Number: _________________________Member Names: _________________________ _________________________Date Issued: October 29, 2008 Turn-in Due: November 5, 2008This lab requires that you use one of three setups. If a signup sheet has beenposted, you must sign up in advance on the lab door. You may reserve each setup for nomore than 2 hours at a time. You must use the same setup each time you work on this lab.A TA must be present for two checkoffs of this lab. Also, it would be useful to bringyour ECE4110 Lab 5 documentation to help you in troubleshooting the network.GoalWhen you begin this lab, there will be several problems in the OSPF network.Your job will be to find and repair the problems. Once you believe you have correctly re-paired the network, a TA will check you off after you reach the designated check-offpoint (there are two check-off points in this lab).Prelab QuestionsAnswer the following questions on a separate sheet of paper, and include your an-swers with your lab report. 1) What are the differences between a distance vector and a link-state routing pro-tocol? What kind of routing protocol is OSPF?2) What IP protocol number does OSPF use?3) What are the mechanisms used by OSPF routers to exchange routing information? Describe them. 4) What is VLSM? Does OSPF support it? Justify your answer.5) How does OSPF determine the metric/cost for a route?26) Why does not OSPF need any mechanism (e.g., split horizon for RIP) to prevent the occurence of rouitng loops?7) Compared to OSPF, what is the limitation of RIP in terms of the size of networks?8) How does OSPF achieve routing scalability to reduce LSAs traffic in a large network?3Lab ScenarioAt the end of this lab, your network should look like the one pictured below::OSPF1OSPF3OSPF2Ethernet1FastEthernet0Ethernet0/010.c.3.110.c.6.210.c.7.110.c.6.110.c.8.110.c.2.210.c.2.110.c.3.210.c.7.2Ethernet1/0Ethernet1Ethernet0Ethernet0FastEthernet0FastEthernet0/0FastEthernet010.c.1.110.c.5.110.c.8.210.c.9.1OSPF4OSPF5Ethernet010.c.5.2Linux Computer 1Linux Computer 2Ethernet110.c.9.210.c.1.2Ethernet0Ethernet14Section 1: Troubleshooting a NetworkFor this lab we have three hardware setups. When you signed up for time in thelab you should have signed up for a particular playstation: 1, 2, or 3. For the entirety ofthis lab, c denotes your playstation number. As with the previous lab, make certain thatno one else is using your setup before beginning work on the lab.In a network, there are often several points of possible failures. Three of the most com-mon reasons why a network is not working properly are:· The physical connection between two nodes in the network has been compro-mised, such as the cable being damaged or one of the nodes being unplugged. Youwill not encounter this problem in this lab. · The routing table in one or more of the computers or routers is misconfigured. · One or more of the interfaces on one or more computers or routers has been mis-configured or is down due to any reason. Unlike the last lab, we are now using OSPF to route our packets. In OSPF we donot need to explicitly define our neighbors in order to route; the hello protocol will per-form automatic discovery. Use the following table to identify your routers and switch. Playstation1Playstation 2 Playstation 3 Switch 5 14 23OSPF 1 Router 7 16 25OSPF 2 Router 8 17 26OSPF 3 Router 9 18 27OSPF 4 Router 10 19 28OSPF 5 Router 11 20 29To begin the lab, you need to get a TA to upload the broken network to your playstation. They will sign off that it is indeed broken.1st TA Signoff – Broken Network: TA has to make sure that routers are loaded properly broken.5Log into the computer marked ECE 4110 Labs 6,7 Setup c. This is the machine marked Linux Computer 1 in our network diagram on page 2. The username is root and the password is passwordTelnet into OSPF1 by typing:telnet 10.c.1.1The telnet password is owen. Enable, then type show ip route. Notice that not all of the subnets on our diagram are present in the output. This indicates that there is some-thing wrong with the network. Save your output from the show ip route command andinclude it in your lab report. Log into ECE 4110 Lab 8 Setup c Computer 2. This is the machine marked Linux Computer 2 on our network diagram on page 2. Your username and password are again root and password. Try to ping Linux Computer 1 from Linux Computer 2. This ping should fail. There are several problems in the network, although none of them involve physi-cal connection issues. Your job is to use the commands you have learned in previous labsto fix the network so that it functions like the network diagramed on page 2. Once you aredone fixing the errors, you should be able to ping Linux Computer 1 from Linux Com-puter 2 and vice versa. In addition to being able to ping the opposite station, you must make sure that all links in the given network diagram are active. You will not get full credit on the lab re-port if the network does not entirely match the diagram, even if you receive a check off.Hints:· From each of the Linux machines try pinging every router. Once you have noted which routers cannot be pinged, you should have a better idea of which links may be down.· Remember, there are several possible sources of failures as mentioned above. Logonto each of the routers and verify that the routing tables are correct. Run show iproute and show running-config on each of the routers and compare the shown routing tables with what should be expected based on the network diagram.· You may ask TAs about the function of specific router configuration commands. You may not ask TAs how to solve specific routing problems.· There may also be problems with the way the switch is configured. Nothing is guaranteed to work correctly. Once you have fixed the network, screenshot the routing table on OSPF1 againand include it in your lab report.6Section 2: Observing OSPFNow that we have fixed our network, we will look specifically at how OSPF responds to changes in the network. Connect to OSPF1 and observe the output to the following command1. show ip route a) Are all the networks indicated in the diagram in the routing table?b) How many routes are there for the network 10.c.8.0/24? Why?c) Comment on one difference between where packets are routed in this table and where they would be routed if you were running RIP. Telnet to 10.c.3.2 (OSPF3), then


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GT ECE 4110 - OSPF and Fixing Broken Networks

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