OSPF (Open Shortest Path First)

Open Shortest Path First (RFC 2328 for IPv4, RFC 5340 for IPv6) is a link-state interior gateway routing protocol used inside large enterprise and operator networks. Routers exchange link-state advertisements, build a complete topology, and compute shortest paths with Dijkstra's algorithm. OSPF supports authentication; production deployments should enable cryptographic authentication on every adjacency.

Categories: Security ControlsProtocols and StandardsInternet and Routing

OSPF in context

Security controls span signaling firewalls (SS7/Diameter/GTP screening), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36.

Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how they interlock, is essential for both design and audit work.

To place OSPF in the wider telecom-security picture, review 3G, A5/1, Digital Signature, IPv6, SHA and SIRT — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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