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A Record of Discussions of Graceful Restart Extensions for Bidirectional Forwarding Detection (BFD)

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Technical Summary

   This document is a historical record of discussions about extending
   the Bidirectional Forwarding Detection (BFD) protocol to provide
   additional capabilities to handle Graceful Restart.

   These discussions took place in the context of the IETF's BFD working
   group, and the consensus in that group was that these extensions
   should not be made.

   This document presents a summary of the challenges to BFD in
   surviving a graceful restart, and outlines a potential protocol
   solution that was discussed and rejected within the BFD working
   group.  The purpose of this document is to provide a record of the
   work done so that future effort will not be wasted.  This document
   does not propose or document any extensions to BFD, and there is no
   intention that it should be implemented in its current form.

Working Group Summary

   The ideas in this I-D were initialy discussed within the BFD WG.
   That WG rejected the motivation for the work and decided to not
   expend any further effort on the solution.

   This document, therefore, does not reflect BFD WG consensus
   and describes prototcol extensions that are not part of the
   standards track BFD solution.
   The BFD WG would have preferred this document to not be
   published, however, it was brought to the ISE for publication.

Document Quality

   The ISE has worked with the author to present this I-D as
   Historic rather than related to the Standards Track.

   Working with the responsible AD, the author has made a
   number of changes to indicate that the text is:
   - historic
   - should not be implemented
   - without support from the BFD WG
   - incomplete.

   There are no implementations of this document.


   This document originates from the ISE.
   Adrian Farrel ( has performed the
   RFC 5742 review.

RFC Editor Note

   After RFC 5742 review, the IESG recommends option 2, viz:

      2. The IESG has concluded that this work is related to IETF work done
      in the BFD WG, but this relationship does not prevent publishing.

   This document does not require the addition of a further IESG note.

RFC Editor Note