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Cisco® Networking All-in-One For Dummies® by Edward Tetz

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Chapter 8: Getting Comfortable with the OSPF and IS-IS Protocols

In This Chapter

check.png Configuring common options for the OSPF and IS-IS protocols

check.png Managing the OSPF and IS-IS protocols with troubleshooting tools

In this chapter, you see a couple of link-state protocols: OSPF (Open Shortest Path First) and IS-IS, which I first discuss in Book IV, Chapter 1. Although in general, link-state protocols all work in the same manner, each is markedly unique to a degree in how they actually carry out their routing. IS-IS has found a home with service providers, and you will not likely implement it on your internal network, whereas OSPF is a popular Interior Gateway Protocol (IGP) that has been implemented on many internal networks. As with other protocols you may have looked at in this minibook in the IGP category, any of them will make a good choice. Using these protocols is easy and straightforward, so you may want to start considering them before your network grows to a point where static routing becomes cumbersome.

As you read this chapter, you will find out how to configure and implement the OSPF and IS-IS protocols, and you will see the main commands you will use to effectively troubleshoot these protocols.

Open Shortest Path First (OSPF)

Because OSPF is an open standard protocol, many ...

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