Internet-Draft draft-ietf-pce-sid-algo-27.txt is now available. It is a work
item of the Path Computation Element (PCE) WG of the IETF.
Title: Carrying SR-Algorithm in Path Computation Element Communication
Protocol (PCEP)
Authors: Samuel Sidor
Zoey Rose
Shaofu Peng
Shuping Peng
Andrew Stone
Name: draft-ietf-pce-sid-algo-27.txt
Pages: 33
Dates: 2025-10-09
Abstract:
This document specifies extensions to the Path Computation Element
Communication Protocol (PCEP) to enhance support for Segment Routing
(SR) with a focus on the use of Segment Identifiers (SIDs) and SR-
Algorithms in Traffic Engineering (TE). The SR-Algorithm associated
with a SID defines the path computation algorithm used by Interior
Gateway Protocols (IGPs). This document introduces extensions in
three main areas.
Mechanisms for informing PCEP peers about the SR-Algorithm associated
with SIDs by encoding this information in Explicit Route Object (ERO)
and Record Route Object (RRO) subobjects. This document updates RFC
8664 and RFC 9603 to allow such extension.
The document specifies SR-Algorithm constraint, enabling refined path
computations that can leverage IGP algorithm logic, including
Flexible Algorithms, and their associated constraints and
optimization metrics.
It defines new metric types for the METRIC object required to support
SR-Algorithm based path computation, but also applicable to Label
Switched Paths (LSPs) setup using different Path Setup Types.
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-sid-algo/
There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-pce-sid-algo-27
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-pce-sid-algo-27
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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