Re: [GROW] [Idr] Input on AS Prepend for draft-idr-rpd-15.txt - Ends 02/24/22
Job Snijders <job@fastly.com> Thu, 10 February 2022 22:05 UTC
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Date: Thu, 10 Feb 2022 23:05:15 +0100
From: Job Snijders <job@fastly.com>
To: Keyur Patel <keyur@arrcus.com>
Cc: "idr@ietf.org" <idr@ietf.org>, GROW <grow@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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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
- Re: [GROW] [Idr] Input on AS Prepend for draft-id… Job Snijders
- [GROW] Input on AS Prepend for draft-idr-rpd-15.t… Keyur Patel
- Re: [GROW] [Idr] Input on AS Prepend for draft-id… Gyan Mishra
- Re: [GROW] [Idr] Input on AS Prepend for draft-id… Randy Bush
- Re: [GROW] [Idr] Input on AS Prepend for draft-id… Jeff Tantsura
- Re: [GROW] Input on AS Prepend for draft-idr-rpd-… Jeffrey Haas
- Re: [GROW] Closed -- Input on AS Prepend for draf… Keyur Patel