Re: [Idr] Input on AS Prepend for draft-idr-rpd-15.txt

As co-author of both drafts I agree with Job to not reference
draft-ietf-grow-as-path-prepending-05.txt at this point in time for future
guidance on recommendations for prepending.

We also discussed this topic between the authors of the Grow draft and
agreed that at this point there is no alternative to a magic constant to
make the recommendation future proof.

Kind Regards

Gyan

On Thu, Feb 10, 2022 at 5:06 PM Job Snijders <job=
40fastly.com@dmarc.ietf.org> wrote:

> Hi all,
>
> (no hats)
>
> On Thu, Feb 10, 2022 at 09:53:44PM +0000, Keyur Patel wrote:
> > IDR is requesting input on the use of AS prepend in BGP policy. This
> > begins a 2 week call for requested input on the beneficial use of AS
> > Prepend. draft-ietf-grow-as-path-prepending-05.txt indicates there is
> > a risk in excessive prepending. In section 5, this draft suggests
> > there is no need to prepend more than 5 ASN in an AS Pathway by a
> > single AS.  Is this recommendation firm or likely to change?  Should a
> > comment be added to the draft-ietf-rpd-15.txt security section to
> > point to the draft-ietf-grow-as-path-prepending-05.txt draft?
> >
> > The RPD draft can be found at:
> > https://datatracker.ietf.org/doc/html/draft-ietf-idr-rpd. The AS Path
> > Prepending draft can be found at:
> > https://datatracker.ietf.org/doc/html/draft-ietf-grow-as-path-prepending
> .
> > This call will end on Feb 24th 2022.
>
> A challenge with the recommendation as currently outlined in
> draft-ietf-grow-as-path-prepending-05 ultimately is that it is a
> so-called "magic constant". Magic constants in an ever growing routing
> system could potentially impede future growth.
>
> At GROW @ IETF 110 in the Q&A of an update on the draft I (and I believe
> others) suggested to try to come up with a formula or some kind of
> function into which certain properties of the default-free zone's
> current observable state produce a useful number; rather than a magic
> constant, to make the draft's recommendation somewhat future-proof. If
> I'm not mistaken, an alternative to the 'magic constant' has not yet
> materialized.
>
> I'd be hesitant to reference draft-ietf-grow-as-path-prepending from
> draft-ietf-rpd at this point in time.
>
> Kind regards,
>
> Job
>
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-- 

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*Gyan Mishra*

*Network Solutions A**rchitect *

*Email gyan.s.mishra@verizon.com <gyan.s.mishra@verizon.com>*

*M 301 502-1347*

Re: [Idr] Input on AS Prepend for draft-idr-rpd-15.txt - Ends 02/24/22