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[Idr] Re: BGP Origin Scrubbing (draft-marenamat-idr-scrub-bgp-origin-00)

Robert Raszuk <robert@raszuk.net> Tue, 04 November 2025 00:01 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 04 Nov 2025 01:00:47 +0100
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To: heasley <heas@shrubbery.net>, Maria Matejka <maria.matejka=40nic.cz@dmarc.ietf.org>
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Subject: [Idr] Re: BGP Origin Scrubbing (draft-marenamat-idr-scrub-bgp-origin-00)
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Hi,

Reading the RIPE91 slides from James in search for justification of this
idea behind this draft it seems that the real issue is that some Tier1s are
overwriting ORIGIN Attribute.

So if anything I would suggest to open a github ticket towards RFC4271bis
to make change in section 5.1.1:

from:

Its value SHOULD NOT be changed by any other speaker.

changed into:

Its value MUST NOT be changed by any other speaker.

Regards,
Robert

On Tue, Nov 4, 2025 at 12:37 AM heasley <heas@shrubbery.net> wrote:

> Mon, Nov 03, 2025 at 11:48:22PM +0100, Maria Matejka:
> > >    The BGP Origin attribute in its original meaning has been out of use
> > >    for years.  Yet, the BGP Origin attribute has high priority in the
> > >    best route selection algorithm, right after the AS Path length, and
> > >    it's being used inconsistently over the Internet to manipulate the
> > >    route preference.
>
> Yes, it is being used to affect route selection.  There are few knobs that
> one can turn for that purpose.  I suggest that the attribute be left alone.
>
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