Chapter 6. IS-IS Network Design
The Intermediate System-to-Intermediate System (IS-IS) protocol was originally designed to provide routing information for the Open Systems Interconnect (OSI) protocols. IS-IS is a link-state protocol in which Intermediate Systems (ISs), or routers, flood routing information to each other within hierarchical levels.
So why would you want to consider IS-IS for routing in a large-scale IP network? In fact, I'm certain some people out there right now are thinking, "IS-IS—are you crazy? It's so hard to configure."
On the contrary, IS-IS is used in very large-scale IP networks, primarily because of its flexible timers, fast convergence, and capability to handle instability in the IP routing domain very well. It's to ...
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