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Path Segment in MPLS Based Segment Routing Network

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft whose latest revision state is "Active".
Expired & archived
Authors Weiqiang Cheng , Han Li , Mach Chen , Rakesh Gandhi , Royi Zigler
Last updated 2019-09-12 (Latest revision 2019-03-11)
Replaces draft-cheng-spring-mpls-path-segment
RFC stream Internet Engineering Task Force (IETF)
SECDIR Last Call Review Incomplete, due 2022-11-20
OPSDIR Last Call Review Incomplete, due 2022-11-20
Additional resources Mailing list discussion
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


A Segment Routing (SR) path is identified by an SR segment list, one or partial segments of the list cannot uniquely identify the SR path. Path identification is a pre-requisite for various use-cases such as performance measurement (PM) of an SR path. This document defines a new type of segment that is referred to as Path Segment, which is used to identify an SR path. When used, it is inserted at the ingress node of the SR path and immediately follows the last segment of the SR path. The Path Segment will not be popped off until it reaches the egress node of the SR path. Path Segment can be used by the egress node to implement path identification hence to support various use-cases including SR path PM, end-to-end 1+1 SR path protection and bidirectional SR paths correlation.


Weiqiang Cheng
Han Li
Mach Chen
Rakesh Gandhi
Royi Zigler

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