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IS-IS - INTRODUCTION
ISIS protocol overview, introduction to the CLNS addressing, routing levels and general operation of the ISIS routing
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Video Description
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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