RFC 9355

OSPF Bidirectional Forwarding Detection (BFD) Strict-Mode, February 2023

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RFC 2328
K. Talaulikar, Ed.
P. Psenak
A. Fu
M. Rajesh
lsr (rtg)

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DOI:  https://doi.org/10.17487/RFC9355

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This document specifies the extensions to OSPF that enable an OSPF router to signal the requirement for a Bidirectional Forwarding Detection (BFD) session prior to adjacency formation. Link-Local Signaling (LLS) is used to advertise the requirement for strict-mode BFD session establishment for an OSPF adjacency. If both OSPF neighbors advertise BFD strict-mode, adjacency formation will be blocked until a BFD session has been successfully established.

This document updates RFC 2328 by augmenting the OSPF neighbor state machine with a check for BFD session up before progression from Init to 2-Way state when operating in OSPF BFD strict-mode.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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