Path Computation Element Communication Protocol (PCEP) Extension for Path Segment in Segment Routing (SR)

The information below is for an old version of the document
Document Type Expired Internet-Draft (pce WG)
Authors Cheng Li  , Mach Chen  , Weiqiang Cheng  , Rakesh Gandhi  , Quan Xiong 
Last updated 2020-04-13 (latest revision 2019-10-11)
Replaces draft-li-pce-sr-path-segment
Stream Internet Engineering Task Force (IETF)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Path Computation Element (PCE) provides path computation functions in support of traffic engineering in Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks. The Source Packet Routing in Networking (SPRING) architecture describes how Segment Routing (SR) can be used to steer packets through an IPv6 or MPLS network using the source routing paradigm. A Segment Routed Path can be derived from a variety of mechanisms, including an IGP Shortest Path Tree (SPT), explicit configuration, or a Path Computation Element (PCE). Path identification is needed for several use cases such as performance measurement in Segment Routing (SR) network. This document specifies extensions to the Path Computation Element Communication Protocol (PCEP) to support requesting, replying, reporting and updating the Path Segment ID (Path SID) between PCEP speakers.


Cheng Li (
Mach Chen (
Weiqiang Cheng (
Rakesh Gandhi (
Quan Xiong (

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