Deprecation of AS_SET and AS_CONFED_SET in BGP

Metadata

Publisher: IETF
Doc Type: Standard
Pages: 13
Abstract: BCP 172 (i.e., RFC 6472) recommends not using AS_SET and AS_CONFED_SET AS_PATH segment types in the Border Gateway Protocol (BGP). This document advances that recommendation to a standards requirement in BGP; it prohibits the use of the AS_SET and AS_CONFED_SET path segment types in the AS_PATH. This is done to simplify the design and implementation of BGP and to make the semantics of the originator of a BGP route clearer. This will also simplify the design, implementation, and deployment of various BGP security mechanisms. This document updates RFC 4271 by deprecating the origination of BGP routes with AS_SET (Type 1 AS_PATH segment) and updates RFC 5065 by deprecating the origination of BGP routes with AS_CONFED_SET (Type 4 AS_PATH segment). Finally, it obsoletes RFC 6472.
Publication Date: 2025-05-01
Status Note: Proposed Standard
DOI: 10.17487/RFC9774
Link: https://doi.org/10.17487/RFC9774
Author(s): Warren Kumari
Kotikalapudi Sriram
Lilia Hannachi
Jeffrey Haas

Latest version of IETF RFC 9774

Document Versions — IETF RFC 9774

▶ IETF RFC 9774 (2025-05-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

IETF RFC 2119 [Active*]
IETF RFC 4271 [Active*]
IETF RFC 4632 [Active*]
IETF RFC 5065 [Active*]
RFC6472 — BCP172 EXTERNAL
IETF RFC 6793 [Active*]
IETF RFC 7606 [Active*]
IETF RFC 8174 [Active*]

Bibliographic Reference(s)

IETF.draft-ietf-sidrops-aspa-verification-22 — I-D.ietf-sidrops-aspa-verification EXTERNAL
"Detailed analysis of AS_SETs in BGP updates", commit ef3f4a9, March 2022, <https://github.com/ksriram25/IETF/blob/main/Detailed-AS_SET-analysis.txt>. EXTERNAL
IANA, "Special-Purpose Autonomous System (AS) Numbers", <https://www.iana.org/assignments/iana-as-numbers-special-registry>. EXTERNAL
IETF RFC 3779 [Active*]
RFC6480 — RFC6480 EXTERNAL
RFC6811 — RFC6811 EXTERNAL
RFC6907 — RFC6907 EXTERNAL
RFC8205 — RFC8205 EXTERNAL
RFC9319 — RFC9319 EXTERNAL
RFC9582 — RFC9582 EXTERNAL

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/RFC9774.json

Reference Tree

Explore all references and references to this document, as a navigable tree.

Open Reference Tree

Reference this Doc

Plain text (ISO 690 compliant)

Preview:

IETF RFC 9774, Deprecation of AS_SET and AS_CONFED_SET in BGP. Available at https://doi.org/10.17487/RFC9774

Snippet:

IETF RFC 9774, Deprecation of AS_SET and AS_CONFED_SET in BGP. Available at https://doi.org/10.17487/RFC9774

HTML (ISO 690 compliant)

Preview:

IETF RFC 9774, Deprecation of AS_SET and AS_CONFED_SET in BGP. Available at https://doi.org/10.17487/RFC9774

Snippet:

<span class="citation"><cite>IETF RFC 9774</cite>, Deprecation of AS_SET and AS_CONFED_SET in BGP. Available at <a href="https://doi.org/10.17487/RFC9774" target="_blank" rel="noopener">https://doi.org/10.17487/RFC9774</a></span>

SMPTE's HTML Pub

Preview:

IETF RFC 9774, Deprecation of AS_SET and AS_CONFED_SET in BGP
doi: 10.17487/RFC9774
url: https://doi.org/10.17487/RFC9774

Snippet:

<li>
<cite id="bib-rfc9774">IETF RFC 9774</cite>, Deprecation of AS_SET and AS_CONFED_SET in BGP
<span class="doi">10.17487/RFC9774</span>
</li>