Michael McBride wrote on 26/07/2020 19:42:
We have submitted
https://datatracker.ietf.org/doc/draft-mcbride-grow-as-path-prepend/
which is intended to be a bcp in the use of AS_Path prepend based on
work of Doug Madory. As we state in the intro: AS_Path prepending is
discussed in Use of BGP Large Communities [RFC8195] and this document
provides additional, and specific, guidance to operators on how to be a
good internet citizen with the proper use of AS_Path prepend.
We would encourage feedback on this document.
Good start - but needs work!
some suggestions:
- it would be useful to have a histogram or table of the frequency of
unique-aspath lengths (i.e. with all prepending flattened). This would
help contextualise the best practice recommendation.
- +1 on randy's comments about de-nationalising and providing examples
of why recommended good practice is good practice.
- a BCP should be as relevant and fresh in 10 years time as it is today,
so imagine it's 2030 and you're reading the draft: plenty of things in
it need to be made insensitive to time context. E.g. 95.47.142.0/23
might be held by a Guatamalan company in 10 years time, AS174 might be
assigned to NTTCogentCentury and AS6939 might be Hurricane Equinix. You
never know.
- it would be useful to give advice on how to measure the effectiveness
of prepending in terms of remote global visibility.
Nick
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