A new Request for Comments is now available in online RFC libraries.
RFC 9917
Title: IGP Flexible Algorithms Reverse Affinity
Constraint
Author: P. Psenak,
J. Horn,
A. Dhamija
Status: Standards Track
Stream: IETF
Date: January 2026
Mailbox: [email protected],
[email protected],
[email protected]
Pages: 12
Updates: RFC 9350, RFC 9843
I-D Tag: draft-ietf-lsr-igp-flex-algo-reverse-affinity-12.txt
URL: https://www.rfc-editor.org/info/rfc9917
DOI: 10.17487/RFC9917
An IGP Flexible Algorithm (Flex-Algorithm) enables the computation of
constraint-based paths within an IGP domain, allowing operators to
influence path selection according to administrative policies. This
document defines an extension to Flex-Algorithm that allows the
inclusion or exclusion of links from path computation based on
Administrative Groups (also known as link affinities) associated with
the reverse direction of the path under computation.
This document updates RFCs 9350 and 9843 by introducing the new IANA
registry that specifies the ordered set of rules that are used to
prune links from the topology during the Flex-Algorithm path
computation.
This document is a product of the Link State Routing Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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