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My question at this point is, <i>what</i> 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.</div>
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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?</div>
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-Adam</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> NANOG <nanog-bounces+athompson=merlin.mb.ca@nanog.org> on behalf of Mark Tinka <mark@tinka.africa><br>
<b>Sent:</b> June 10, 2021 02:36<br>
<b>To:</b> nanog@nanog.org <nanog@nanog.org><br>
<b>Subject:</b> Re: A survey on BGP MRAI timer values in practice</font>
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On 6/10/21 08:26, Saku Ytti wrote:<br>
<br>
> I don't understand the question, but the way I read the question it<br>
> may be unanswerable even if I did understand it. As the reader would<br>
> self-define negligible and well acceptable and answer yes/no based on<br>
> the definition they used, which might be different to the definition<br>
> writer intended.<br>
<br>
It's possible we've become accustom to a slow, global BGP, due to a <br>
perception of fragility (and complexity), which favours stability over <br>
speed.<br>
<br>
I suppose the size of the current BGP and the nature of the FSM it lends <br>
itself to does some to account for those perceptions.<br>
<br>
At a per-ISP level, it is not impossible to speed up (i)BGP convergence. <br>
On a global scale, taking the least common denominator to allow for all <br>
manner of network we don't know about, allowing the ship a wide turn in <br>
BGP waters, at least on a perceptive level, seems like an unsigned <br>
social agreement amongst autonomous systems.<br>
<br>
Ultimately, I feel we aren't talking enough about this, and hopefully, <br>
this thread gets us to that point.<br>
<br>
Mark.<br>
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