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<span style="margin:0px;font-size:12pt">+1 to Saku's concerns - I simply ignored the survey because I wasn't sure what MRAI was, and I wasn't sure what my values would be. But I have time to be interested right now, so a-spelunking I go...</span>
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<div style="margin:0px;font-size:12pt">The term "MRAI" does not appear anywhere in Arista's or Extreme's documentation. Nor does this timer interval appear in any BGP-related "show" output, on any of my platforms, that I can see.</div>
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<div style="margin:0px;font-size:12pt">I've found out that "out-delay" (<i>not </i>"delay out") is synonymous with MRAI and seems widely used.</div>
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<div style="margin:0px;font-size:12pt">I found "out-delay" in an Arista technote, and <span style="margin:0px">now I know how to override it on Aristas, and the default is zero (0). Unfortunately, "show" commands on EOS will only show you the current out-delay
if it is non-zero, which makes reporting it a bit difficult.</span></div>
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<div style="margin:0px;font-size:12pt">Extreme's MLXe platform doesn't appear to support an out-delay/MRAI knob at all, at least as far as I can tell. I know there are several other current and former MLXe operators here, maybe one of them will know?</div>
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<div style="margin:0px;font-size:12pt">Based on my limited history with NANOG-L, I guess your initial email might have been seen by perhaps 20 people who immediately knew what you were talking about, and 2000 who didn't. (I don't actually know subscriber numbers,
that's totally a WAG. And maybe more people have touched out-delay knobs than I think. Dunno.)</div>
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<div style="margin:0px;font-size:12pt"><i><snide but hopefully not too much></i> This illustrates the gap between academia and industry - academics can research a narrow topic, and come at issues from a theoretic standpoint using unfamiliar terminology. As
a practitioner, I get told to add carrier X as a peer by end-of-day Friday, and "just make it work". I wasn't even able to understand your initial question, because I haven't spent a semester understanding the intricacies of BGP propagation - I just know
it usually works, knobs exist that I shouldn't fiddle with, and that's good enough for my job.
<i></snide></i></div>
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<div style="margin:0px;font-size:12pt">If your work results in actionable recommendations such as "don't use BGP out-delay timers to mitigate XYZ in circumstance LMNO, do ABC instead", that's fantastic. Please keep us advised, and do post aggregated survey
results here once you close the survey.</div>
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<div style="margin:0px;font-size:12pt"><span style="margin:0px;font-size:12pt;background-color:rgb(255, 255, 255)">I<span> </span><b>am </b>specifically interested in the answer to "Have you ever had to adjust BGP out-delay with any of your peers, and why?"
It would be great if we could derive that answer from the survey results, but anecdotal replies here would also be helpful. A<span style="background-color:rgb(255, 255, 255);display:inline !important">ll you larger(-than-me) network operators out there: when
would I need to use out-delay? Why? What does it accomplish?</span></span>
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<div style="margin:0px;font-size:12pt;background-color:rgb(255, 255, 255)">Good luck in reformulating your survey to get better engagement,</div>
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<span style="margin:0px;font-size:12pt">-Adam</span><br>
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<p class="MsoNormal" style="margin-top: 0px; margin-bottom: 0px;"><b><span style="font-size:10.0pt; color:#44546A">Adam Thompson</span></b><span style="font-size:9.0pt; color:#44546A"><br>
Consultant, Infrastructure Services<br>
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100 - 135 Innovation Drive<br>
Winnipeg, MB, R3T 6A8<br>
(204) 977-6824 or 1-800-430-6404 (MB only)<br>
<a href="mailto:athompson@merlin.mb.ca"><span style="color:#44546A">athompson@merlin.mb.ca</span></a><br>
<a href="http://www.merlin.mb.ca/"><span style="color:#44546A">www.merlin.mb.ca</span></a></span></p>
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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 Saku Ytti <saku@ytti.fi><br>
<b>Sent:</b> June 8, 2021 01:06<br>
<b>To:</b> shahrooz@cs.umass.edu <shahrooz@cs.umass.edu><br>
<b>Cc:</b> nanog list <nanog@nanog.org>; Arun Venkataramani <arun@cs.umass.edu><br>
<b>Subject:</b> Re: A survey on BGP MRAI timer values in practice</font>
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<div class="PlainText">On Mon, 7 Jun 2021 at 19:32, <shahrooz@cs.umass.edu> wrote:<br>
<br>
> We often read that the Internet (i.e. BGP) has a long convergence delay.<br>
> But why is it so slow? And can we (researchers) do anything about it?<br>
<br>
Create business incentives to improve it. This is a non-technical<br>
problem, we've long had technical tools to make it fast, there just<br>
isn't incentive to make it fast. Customers are not asking operators<br>
for better convergence speeds.<br>
<br>
> Please help us out to find out by answering our short anonymous survey<br>
> (<10 minutes).<br>
<br>
Can you tell me what have you done so far? What are the default MRAI<br>
values for each AFI/SAFI for IOS, IOS-XR, Junos, SROS, VRP and EOS?<br>
Then people responding don't have to check what their NOS does, they<br>
can refer to your table and tell the default value, since this is what<br>
>99% will be using.<br>
<br>
Now your survey has built-in selection bias, people who answer it are<br>
people who know what it is and who are concerned about it and have<br>
changed it, this is not a representative group and you will start your<br>
work with very bad data.<br>
<br>
<br>
<br>
-- <br>
++ytti<br>
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