Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP)

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Publisher: IETF
Doc Type: Standard
Pages: 26
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). It introduces mechanisms for PCEP peers to signal the SR-Algorithm associated with SIDs by encoding this information in Explicit Route Object (ERO) and Record Route Object (RRO) subobjects, enables SR-Algorithm constraints for path computation, and defines new metric types for the METRIC object. This document updates RFC 8664 and RFC 9603 to allow such extensions.
Publication Date: 2026-07-01
Status Note: Proposed Standard
DOI: 10.17487/RFC9933
Link: https://doi.org/10.17487/RFC9933
Author(s): S. Sidor
Z. Rose
S. Peng
A. Stone
Keyword(s): Flexible Algorithm

Latest version of IETF RFC 9933

Document Versions — IETF RFC 9933

▶ IETF RFC 9933 (2026-07-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

IETF RFC 2119 [Active*]
IETF RFC 5440 [Active*]
IETF RFC 7471 [Active*]
IETF RFC 8174 [Active*]
IETF RFC 8231 [Active*]
IETF RFC 8233 [Active*]
IETF RFC 8253 [Active*]
IETF RFC 8281 [Active*]
IETF RFC 8402 [Active*]
IETF RFC 8570 [Active*]
IETF RFC 8664 [Active*]
IETF RFC 8665 [Active*]
IETF RFC 8667 [Active*]
IETF RFC 9256 [Active*]
IETF RFC 9350 [Active*]
IETF RFC 9603 [Active*]
IETF RFC 9753 [Active*]
IETF RFC 9843 [Active*]
IETF RFC 9916 [Active*]
IETF RFC 9917 [Active*]

Bibliographic Reference(s)

10.1109-IEEESTD.2019.8766229 — IEEE754 EXTERNAL
IANA, "IGP Algorithm Types", <https://www.iana.org/assignments/igp-parameters>. EXTERNAL
IETF RFC 3031 [Active*]
IETF RFC 4655 [Active*]
IETF RFC 5541 [Active*]
IETF RFC 9325 [Active*]
IETF RFC 9479 [Active*]
IETF RFC 9492 [Active*]
IETF RFC 9552 [Active*]
IETF RFC 9826 [Active*]

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Amends:

IETF RFC 8664 [Active*]

IETF RFC 9603 [Active*]

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<span class="citation"><cite>IETF RFC 9933</cite>, Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP). Available at <a href="https://doi.org/10.17487/RFC9933" target="_blank" rel="noopener">https://doi.org/10.17487/RFC9933</a></span>

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IETF RFC 9933, Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP)
doi: 10.17487/RFC9933
url: https://doi.org/10.17487/RFC9933

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<li>
<cite id="bib-rfc9933">IETF RFC 9933</cite>, Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP)
<span class="doi">10.17487/RFC9933</span>
</li>