Looking Ahead

We have spent two chaptersone of them very longdescribing the major aspects of OSPF, which is not only the most well-known of the link-state routing protocols, but probably the most widely used IP routing protocol. In the next chapter we will look at a less-known link-state protocol: IS-IS. Some might call this a "more exotic" protocol, but as you will see, it is actually much simpler than OSPF.