Chapter 4. IS-IS
Intermediate System-to-Intermediate System (IS-IS) is a link state routing protocol that is part of the OSI family of protocols. Like OSPF, it uses Dijkstra’s SPF algorithm to choose routes. IS-IS is a classless interior gateway protocol that uses router resources efficiently and scales to large networks, such as large Internet service providers (ISP).
Table 4-1 lists some IS-IS terms, acronyms, and their meanings.
Table 4-1. IS-IS Acronyms
Term | Acronym | Description |
|---|---|---|
Circuit ID | Identifies a physical interface on the router. | |
Complete Sequence Number PDU | CSNP | A summary of a router’s complete LSDB. |
Connectionless Network Protocol | CLNP | OSI protocol used to provide the connectionless services. |
Connectionless Network Services | CNLS | OSI data delivery service ... |
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