As in all configurations, the essential commands give a basic configuration, and the more advanced commands either tune the system for efficiency or provide additional configurations for different situations. There is the cake, and then there is the icing. The first section of this chapter deals with the required commands. The next section covers the optional commands. You then learn how to confirm the configuration and how to troubleshoot that configuration to maintain the smooth operation of the network.
The topics in this chapter detail the steps to configuring the IS-IS protocol for integrated routing on a Cisco network. This chapter assumes knowledge of routing protocols—in particular, linkstate routing protocols—and the terminology, concepts, and operation of IS-IS.
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