Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane

Document Type Replaced Internet-Draft (spring WG)
Authors Greg Mirsky  , Jeff Tantsura  , Ilya Varlashkin  , Mach Chen  , Jiang Wenying 
Last updated 2020-09-22 (latest revision 2020-04-26)
Replaced by draft-ietf-spring-bfd
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-spring-bfd
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Segment Routing (SR) architecture leverages the paradigm of source routing. It can be realized in the Multiprotocol Label Switching (MPLS) network without any change to the data plane. A segment is encoded as an MPLS label, and an ordered list of segments is encoded as a stack of labels. Bidirectional Forwarding Detection (BFD) is expected to monitor any existing path between systems. This document defines how to use Label Switched Path Ping to bootstrap a BFD session, control an SR Policy in the reverse direction of the SR-MPLS tunnel, and applicability of BFD Demand mode in the SR-MPLS domain. Also, the document describes the use of BFD Echo with BFD Control packet payload.


Greg Mirsky (
Jeff Tantsura (
Ilya Varlashkin (
Mach Chen (
Jiang Wenying (

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