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BFD Path Consistency over SR

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Changwang Lin , Weiqiang Cheng , Jiang Wenying , Ran Chen
Last updated 2024-05-11 (Latest revision 2023-11-08)
Replaces draft-lin-sbfd-path-consistency-over-srv6
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Bidirectional Forwarding Detection (BFD) can be used to monitor paths between nodes. U-BFD defined in [I-D.ietf-bfd-unaffiliated-echo] can effectively reduce the device equipment. Seamless BFD (S-BFD) provides a simplified mechanism which is suitable for monitoring of paths that are setup dynamically and on a large scale network. In SR network, BFD can also be used to monitor SR paths. When a headend use BFD to monitor the segment list/CPath of SR Policy, the forward path of control packet is indicated by segment list, the reverse path of response control packet is via the shortest path from the reflector back to the initiator (headend) as determined by routing. The forward path and reverse path of control packet are likely inconsistent going through different intermediate nodes or links. This document describes a method to keep the forward path and reverse path consistent when using S-BFD or U-BFD to detect SR Policy


Changwang Lin
Weiqiang Cheng
Jiang Wenying
Ran Chen

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)