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RFC 9825
Title: Extensions to OSPF for Advertising
Prefix Administrative Tags
Author: A. Lindem, Ed.,
P. Psenak,
Y. Qu
Status: Standards Track
Stream: IETF
Date: July 2025
Mailbox: [email protected],
[email protected],
[email protected]
Pages: 18
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-lsr-ospf-admin-tags-29.txt
URL: https://www.rfc-editor.org/info/rfc9825
DOI: 10.17487/RFC9825
It is useful for routers in OSPFv2 and OSPFv3 routing domains to be
able to associate tags with prefixes. Previously, OSPFv2 and OSPFv3
were relegated to a single tag and only for Autonomous System (AS)
External and Not-So-Stubby-Area (NSSA) prefixes. With the flexible
encodings provided by OSPFv2 Prefix/Link Attribute Advertisement and
OSPFv3 Extended Link State Advertisements (LSAs), multiple
administrative tags may be advertised for all types of prefixes.
These administrative tags can be used for many applications including
route redistribution policy, selective prefix prioritization,
selective IP Fast Reroute (IPFRR) prefix protection, and many others.
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
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