OSPF vs ISIS

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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