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

Jeff Tantsura <jefftant.ietf@gmail.com> Sat, 12 February 2022 23:56 UTC

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From: Jeff Tantsura <jefftant.ietf@gmail.com>
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Date: Sat, 12 Feb 2022 15:56:13 -0800
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References: <YgWMG4MzdOhWhZlh@snel>
Cc: Keyur Patel <keyur@arrcus.com>, idr@ietf.org, GROW <grow@ietf.org>
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To: Job Snijders <job=40fastly.com@dmarc.ietf.org>
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Subject: Re: [GROW] [Idr] Input on AS Prepend for draft-idr-rpd-15.txt - Ends 02/24/22
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Fully agree with Job!

Cheers,
Jeff

> On Feb 10, 2022, at 14:05, 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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