What You Will Learn
After reading this chapter, you should be able to
Explain the Intermediate System-to-Intermediate System (IS-IS) routing protocol
Understand the concepts, terminology, and operation of IS-IS
Compare IS-IS with OSPF
Understand the basics of configuring IS-IS on Cisco routers
IS-IS is a hierarchical link-state interior routing protocol similar to OSPF. The International Organization for Standardization (ISO) originally developed IS-IS to route packets using Network Service Access Point (NSAP) addresses, and not IP addresses.
In the IP world, the two main entities are hosts and routers. (See Figure 7-1.) An IP protocol ...