Hi Mike, Saumya
From an operational point of view, asking for static routing policy to
be applied on the other-network side sounds inadvisable for two reasons:
1. it puts the "your-network" operator in a position that they no longer
have direct control of their inbound traffic routing policy, which means
that if they have a sudden need to change this, they're now subject to
the availability of someone on other-network to either update or delete
your inbound routing policy. This won't work in any non-trivial network,
which is the type of network that we're discussing here.
2. at a much more fundamental level, the only thing that this suggestion
does is kick the can down the alley because other-network's policy
toolbox isn't going to be any different to your-network's toolbox. I.e.
I'd question whether this is solving anything in any real sense.
Nick
Michael McBride wrote on 15/10/2025 06:03:
Hi Saumya,
Please see MM below:
*From:*Dikshit, Saumya <[email protected]>
*Sent:* Monday, August 4, 2025 1:08 PM
*To:* [email protected]; [email protected]
*Cc:* [email protected]
*Subject:* [GROW] Re: I-D Action: draft-ietf-grow-as-path-prepending-16.txt
Hello Authors,
Are route-maps on the receiving peer (more than publishing BGP), a
flexible and open-ended suggestion which might fit all the bills.
MM: Good idea. How about a simple statement added to the Alternatives to
AS Path Prepending section:
“Coordinate with neighboring ASes that can apply inbound policies (e.g.,
route-maps) to achieve routing preferences without requiring AS path
prepending.”
Thanks,
Mike
Thanks,
Saumya.
*From: *[email protected] <mailto:[email protected]>
<[email protected] <mailto:[email protected]>>
*Date: *Tuesday, 8 July 2025 at 1:13 AM
*To: *[email protected] <mailto:[email protected]>
<[email protected] <mailto:[email protected]>>
*Cc: *[email protected] <mailto:[email protected]> <[email protected]
<mailto:[email protected]>>
*Subject: *[GROW] I-D Action: draft-ietf-grow-as-path-prepending-16.txt
Internet-Draft draft-ietf-grow-as-path-prepending-16.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-16.txt
Pages: 13
Dates: 2025-07-07
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://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-grow-as-path-prepending/__;!!NpxR!j-HuQTQw8Z51xQCMijJ2C-mjUUPOotPle3x_8INaPO6TX95dejElvGQ2pQ6pBFLQSqdQAihdN4eD-_w4zvBKyjR4_Jg$
<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-grow-as-path-prepending/__;%21%21NpxR%21j-HuQTQw8Z51xQCMijJ2C-mjUUPOotPle3x_8INaPO6TX95dejElvGQ2pQ6pBFLQSqdQAihdN4eD-_w4zvBKyjR4_Jg$>
There is also an HTMLized version available at:
https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-grow-as-path-prepending-16__;!!NpxR!j-HuQTQw8Z51xQCMijJ2C-mjUUPOotPle3x_8INaPO6TX95dejElvGQ2pQ6pBFLQSqdQAihdN4eD-_w4zvBKyrwwP2E$
<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-ietf-grow-as-path-prepending-16__;%21%21NpxR%21j-HuQTQw8Z51xQCMijJ2C-mjUUPOotPle3x_8INaPO6TX95dejElvGQ2pQ6pBFLQSqdQAihdN4eD-_w4zvBKyrwwP2E$>
A diff from the previous version is available at:
https://urldefense.com/v3/__https://author-tools.ietf.org/iddiff?url2=draft-ietf-grow-as-path-prepending-16__;!!NpxR!j-HuQTQw8Z51xQCMijJ2C-mjUUPOotPle3x_8INaPO6TX95dejElvGQ2pQ6pBFLQSqdQAihdN4eD-_w4zvBKVOR5ruM$
<https://urldefense.com/v3/__https:/author-tools.ietf.org/iddiff?url2=draft-ietf-grow-as-path-prepending-16__;%21%21NpxR%21j-HuQTQw8Z51xQCMijJ2C-mjUUPOotPle3x_8INaPO6TX95dejElvGQ2pQ6pBFLQSqdQAihdN4eD-_w4zvBKVOR5ruM$>
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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