OSPF Bidirectional Forwarding Detection (BFD) Strict-Mode, February 2023
- File formats:
- Also available: XML file for editing
- PROPOSED STANDARD
- RFC 2328
- K. Talaulikar, Ed.
- lsr (rtg)
Discuss this RFC: Send questions or comments to the mailing list [email protected]
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.