OSPF Version 2
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J. Moy · 1998-04
Abstract
OSPF Version 2 is a link-state routing protocol designed for use within a single Autonomous System. Routers exchange link-state advertisements (LSAs) to build a synchronized topology database, then independently compute shortest-path trees via Dijkstra's algorithm. RFC 2328 obsoletes the earlier RFC 2178.
Why This RFC Matters
OSPF is the dominant interior gateway protocol (IGP) in large enterprise and service-provider networks. Its hierarchical area design (backbone Area 0 plus stub and NSSA areas) limits the scope of topology changes and LSA flooding, making it scalable to thousands of routers. Fast convergence via incremental SPF computation and support for equal-cost multipath (ECMP) have kept OSPF the reference standard for intra-domain routing since the late 1990s.