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n this chapter, we build on our discussion of IP routing protocols by examining the specific link state protocol OSPF, or Open Shortest Path First. OSPF is an important routing protocol widely used in enterprise and service provider networks today. Having a foundational understanding of its mechanics is extremely important. OSPF has many complex features, and a detailed discussion of all of them has filled entire books. In this chapter, we introduce you to only the most important aspects of the protocol to give you a foundation for understanding the basics. Primarily, we focus on how OSPF discovers neighbor routers and exchanges link state information with other routers. We examine how link state information is flooded throughout a network so that each router has an identical view of the topology and look at how OSPF determines the shortest path to each network destination using this information.

Because every instruction in every application must pass single-file through the CPU, we tend to optimize our code for this needle s eye. Programmers work hard to keep the number of instructions to a minimum, ensuring snappy performance for users. What we often forget, however, is that as soon as the CPU has hurriedly finished all its work, it waits idle, doing nothing, until the user issues another command. We invest enormous efforts in reducing the computer s reaction time, but we invest little or no effort in putting it to work proactively when it is not busy reacting to the user. Our software commands the CPU as though it were in the army, alternately telling it to hurry up and wait. The hurry up part is great, but the waiting needs to stop. In our current computing systems, users need to remember too many things, such as the names they give to files and the precise location of those files in the file system. If a user wants to find that spreadsheet with the quarterly projections on it again, he must either remember its name or go browsing. Meanwhile, the processor just sits there, wasting billions of cycles. Most current software also takes no notice of context. When a user is struggling with a particularly difficult spreadsheet on a tight deadline, for example, the application offers precisely as much help as it offers when he is noodling with numbers in his spare time. Software can no longer, in good conscience, waste so much idle time while users work. It is time for our computers to begin to shoulder more of the burden of work in our day-to-day activities.

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The following assessment questions will help you understand what areas of OSPF you should review in more detail to prepare for the exam. 1. OSPF discovers neighbors ______. A. Only by manually configuring the router B. By flooding updates C. Using Hello advertisements D. Using a host table 2. Which of the following is not a feature of the OSPF protocol A. Supports authentication. B. Provides a loop-free topology. C. Uses the Shortest Path First algorithm. D. Uses a hop count based metric. 3. Which logical interface is recommended for defining a router ID A. Ethernet interface B. Chassis interface C. MAC address D. System interface

Most users in normal situations can t do anything in less than a few seconds That is enough time for a typical desktop computer to execute at least a billion instructions Almost without fail, those interim cycles are dedicated to idling The processor does nothing except wait The argument against putting those cycles to work has always been: We can t make assumptions; those assumptions might be wrong Our computers today are so powerful that, although the argument is still true, it is frequently irrelevant Simply put, it doesn t matter if the application s assumptions are wrong; it has enough spare power to make several assumptions and discard the results of the bad ones when the user finally makes his choice.

4. What is the primary purpose of the OSPF router ID A. To elect a designated router B. To uniquely identify an OSPF router C. To trace sequence numbers D. To support LSA flooding 5. LSA updates are sent in response to network changes and ______. A. Every 30 minutes B. After the Hello timer expires C. When the Dr detects the BDr has failed D. Every 30 minutes provided new information needs to be transmitted You will find the answers to each of these questions in Appendix A. You can also use the CD that accompanies this book to take all the assessment tests and review the answers.

private int maxNeighborReading 0 { int max 0; for (int i = 0; i < targetReadings.length; i++) if (targetReadings [i] > max) targetReadings [il ; max return max;

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