ISIS protocol overview, introduction to the CLNS addressing, routing levels and general operation of the ISIS routing

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IS-IS: Intermediate System to Intermediate System Routing protocol

Standard protocol developed by ISO for CLNS networks
RFC 1195: Use of OSI IS-IS for Routing in TCP/IP and Dual Environments

Encapsulated directly over data-link frames 

Uses CLNS addressing scheme: NSAP

Link-State Protocol
Dijkstra (SPF) algorithm

Uses adjacencies to exchange information

The messages (hello/LSP/PSNP/CSNP)  from each router arrive to all of the devices in the area:
Messages are stored in the LSDB
Each router has a full picture of the network topology

Metric based on the interface cost

Widely used protocol in the SP cores. 



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