OSPF and ISIS are both are Link State Routing Protocols using the Dijkstra SPF Algorithm are Interior Gateway Protocols (IGP) they distribute routing information between routers belonging to a single Autonomous System (AS).

Furthermore, below features are supported by both protocols –

  • Classless Inter-Domain Routing (CIDR)
  • Variable Subnet Length Masking (VLSM)
  • Authentication
  • Multi-path
  • IP unnumbered links

Below table enumerates the difference between OSPF and ISIS protocols –

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