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 in telecom span signaling firewalls (SS7/Diameter/GTP screening at the network edge), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both the packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36 and, in Europe, NIS2 sectoral rules.

Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how the specs interlock (for example 3GPP TS 33.501 with GSMA FS.34 for 5G SBA security), is essential for both design and audit work.

To place OSPF in the wider telecom-security picture, review A5/1, TR-069, RPKI-to-Router, 3G, BGP and Digital Signature.

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