{
  "draft": "draft-ietf-pce-sid-algo-29",
  "doc_id": "RFC9933",
  "title": "Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP)",
  "authors": [
    "S. Sidor",
    "Z. Rose",
    "S. Peng",
    "S. Peng",
    "A. Stone"
  ],
  "format": [
    "XML",
    "TEXT",
    "HTML",
    "PDF"
  ],
  "page_count": "26",
  "pub_status": "PROPOSED STANDARD",
  "status": "PROPOSED STANDARD",
  "source": "Path Computation Element",
  "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.",
  "pub_date": "July 2026",
  "keywords": [
    "Prefix-SID Algorithm",
    "Flexible Algorithm",
    "IGP Algorithm Types"
  ],
  "obsoletes": [],
  "obsoleted_by": [],
  "updates": [
    "RFC8664",
    "RFC9603"
  ],
  "updated_by": [],
  "see_also": [],
  "doi": "10.17487/RFC9933",
  "errata_url": null
}