Hi Mike, authors,
the root problem here remains prefix hijacking. I'm not convinced that
the IETF should publish an opinion about AS path prepending, as it's not
intrinsically harmful in itself, even if it can be an aggravating factor
in some situations.
Nick
Doug Madory wrote on 15/04/2026 03:58:
Thanks for all of your work on this draft over the years, Mike.
This effort was inspired by a talk I gave about excessive prepending
at NANOG almost six years ago; that's how I became one of the authors.
That said, I'm not sure there is industry consensus on the specifics
of prepending to the point that it requires an RFC. If the other
authors wish to move forward without me, that is fine. I just worry
about taking up the volunteer staff's time wordsmithing a document of
questionable value.
On Tue, Apr 14, 2026 at 10:01 PM Michael McBride
<[email protected] <mailto:[email protected]>>
wrote:
Hi all,
In this update we included some, much appreciated, wglc comments
from Randy Bush:
Made clear that the steering applies only to inbound traffic.
Expanded acronyms on first use.
Clarified a couple sentences and Figure 1.
Fixed spelling.
mike
-----Original Message-----
From: [email protected] <mailto:[email protected]>
<[email protected] <mailto:[email protected]>>
Sent: Tuesday, April 14, 2026 6:51 PM
To: [email protected] <mailto:[email protected]>
Cc: [email protected] <mailto:[email protected]>
Subject: [GROW] I-D Action: draft-ietf-grow-as-path-prepending-19.txt
Internet-Draft draft-ietf-grow-as-path-prepending-19.txt is now
available. It is a work item of the Global Routing Operations
(GROW) WG of the IETF.
Title: AS Path Prepending
Authors: Mike McBride
Doug Madory
Jeff Tantsura
Robert Raszuk
Hongwei Li
Jakob Heitz
Gyan Mishra
Name: draft-ietf-grow-as-path-prepending-19.txt
Pages: 12
Dates: 2026-04-14
Abstract:
Autonomous System (AS) path prepending is a tool to manipulate the
BGP AS_PATH attribute through prepending one or more Autonomous
System Numbers (ASNs). AS path prepending is used to
deprioritize a
route in the presence of a route with a shorter AS_PATH. By
prepending a local ASN multiple times, ASes can make advertised AS
paths appear artificially longer. However, excessive AS path
prepending has caused routing issues in the Internet. This
document
provides guidance for the use of AS path prepending, including
alternative solutions, in order to avoid negatively affecting the
Internet.
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-grow-as-path-prepending/
There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-grow-as-path-prepending-19
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-grow-as-path-prepending-19
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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