Fully agree with Job! Cheers, Jeff
> On Feb 10, 2022, at 14:05, Job Snijders <[email protected]> > 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 > > _______________________________________________ > Idr mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/idr _______________________________________________ GROW mailing list [email protected] https://www.ietf.org/mailman/listinfo/grow
