A look at OSPFv1, OSPFv2 & OSPFv3
  • OSPFv1: This was the original version of OSPF defined in RFC 1131. It had limitations in terms of scalability and extensibility.
  • OSPFv2: This is the most commonly used version of OSPF today. It is defined in RFC 2328 and includes various improvements over OSPFv1, such as support for variable-length subnet masks (VLSM) and classless inter-domain routing (CIDR).
  • OSPFv3: OSPFv3 is designed to support IPv6 networks and is defined in RFC 5340. It includes enhancements to support IPv6 addressing and has some differences in packet formats compared to OSPFv2.

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