My question at this point is, what slow global convergence? When I (or any of my downstreams) adjusts a prefix, I nearly always see global propagation in well under 60 seconds. Among networks where I can check, at least. I understand it could be technically possible to see near-instantaneous global convergence in more like <5sec, but... on a global scale, neither I nor my customers care about the difference between 5s and 60s. Do other people need <60s propagation? -Adam ________________________________ From: NANOG <nanog-bounces+athompson=merlin.mb.ca@nanog.org> on behalf of Mark Tinka <mark@tinka.africa> Sent: June 10, 2021 02:36 To: nanog@nanog.org <nanog@nanog.org> Subject: Re: A survey on BGP MRAI timer values in practice On 6/10/21 08:26, Saku Ytti wrote:
I don't understand the question, but the way I read the question it may be unanswerable even if I did understand it. As the reader would self-define negligible and well acceptable and answer yes/no based on the definition they used, which might be different to the definition writer intended.
It's possible we've become accustom to a slow, global BGP, due to a perception of fragility (and complexity), which favours stability over speed. I suppose the size of the current BGP and the nature of the FSM it lends itself to does some to account for those perceptions. At a per-ISP level, it is not impossible to speed up (i)BGP convergence. On a global scale, taking the least common denominator to allow for all manner of network we don't know about, allowing the ship a wide turn in BGP waters, at least on a perceptive level, seems like an unsigned social agreement amongst autonomous systems. Ultimately, I feel we aren't talking enough about this, and hopefully, this thread gets us to that point. Mark.