The Intermediate System-to-Intermediate System (IS-IS) Routing Protocol is a versatile and robust routing protocol suitable for both IP and CLNP applications. In the IP world, it has emerged as the only practical alternative to the Open Shortest Path First Protocol for Interior Gateway Protocol (IGP) applications in Internet Service Provider (ISP) networks. IS-IS is the IGP of choice in most tier one ISP environments and its significance certainly explains why it features in the CCIE Routing and Switching, as well as the CCIE IP recertification exams. Despite the importance of IS-IS in IP networking, it has received little coverage in the technical press and networking literature. Most users and networking professionals rely on scanty ...

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