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docs: add BFD strict mode documentation for BGP neighbors#865

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r3m8:feature/bfd-strict-mode-docs
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docs: add BFD strict mode documentation for BGP neighbors#865
r3m8 wants to merge 1 commit intoopnsense:masterfrom
r3m8:feature/bfd-strict-mode-docs

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@r3m8 r3m8 commented Mar 27, 2026

Summary

Documented the new BGP neighbor-level BFD Strict Mode option in FRR dynamic routing docs.

What changed

  • Updated source/manual/dynamic_routing.rst in the Routing → BGP → Neighbors options table.
  • Added BFD Strict Mode with:
    • behavior: requires BFD session establishment before allowing BGP to connect; BGP immediately closes the session if BFD goes down
    • requirement: BFD must be enabled
    • intent: prevents BGP sessions from remaining up when the underlying link is down, avoiding routing blackholes

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