- 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.
Exploring OSPF Evolution: A Look at OSPFv1, OSPFv2, and OSPFv3
