Telematics Chapter 6: Network Layer - Freie Universität Berlin

Intermediate System to Intermediate System (IS-IS)
● Standardized in the context of OSI for the connectionless layer 3 protocol
● Republished by IETF as RFC 1142 (however sometimes also cited as IS-IS=0 …)
● Link-state, very similar to OSPF, based on Dijkstra
● Neutral to layer 3 protocol (OSPF routes IP, originally v4)
● Thus IPv6 got faster support by IS-IS
● Routers also build a map of the network, calculate shortest path
● Lower overhead compared to OSPF, better scalability
● Often used by network operators with many routers
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer
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