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RFC 9933: Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP)

In plain English — editorial summary, not part of the RFC

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.

Document record

Document ID
RFC9933
Published
July 2026
Authors
S. Sidor; Z. Rose; S. Peng; S. Peng; A. Stone
Status
PROPOSED STANDARD
Stream
IETF
Area
rtg
Pages
26
Also known as
—
Updates:
RFC 8664, RFC 9603

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

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canonical URL: /rfc/9933-carrying-sr-algorithm-in-path-computation-element-communication-protocol-pcep