Chapter Summary
The IS-IS routing protocol is one of three network layer protocols specified by ISO to support the CLNS. The others are CLNP and ES-IS. Even though IS-IS was designed for routing ISO CLNP packets, it has been adapted for use in IP environments as Integrated IS-IS.
Integrated IS-IS has evolved over the years into a scalable, robust, and easy-to-use Interior Gateway Routing Protocol (IGP) that can operate in dual mode to support overlayed IP and ISO CLNS networks. However, IS-IS has probably gained more popularity on the Internet, where its primary application is for intradomain IP routing. As an IGP in an Internet routing domain or autonomous system, Integrated IS-IS plays a critical supportive role for the Border Gateway Protocol ...
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