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<p style="margin: 0 0 1em 0; color: black;">Do you mean spanning tree
protocol? <br>
I'm not sure how that could cross a router boundary, but it is something to
look into.. </p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
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<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt 0;">On
October 3, 2017 7:12:00 AM Derek Atkins <derek@ihtfp.com> wrote:</p>
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style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
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<p style="margin: 0 0 1em 0; color: black;">I'm sorry. What is STP? <br>
And how do I turn that off? </p>
<p style="margin: 0 0 1em 0; color: black;">-derek<br>
Sent using my mobile device. Please excuse any typos. <br>
</p>
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<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt 0;">On
October 2, 2017 7:41:15 PM Colin Coe <colin.coe@gmail.com> wrote:</p>
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style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
<div dir="ltr"><div dir="auto"></div><div class="gmail_extra">Hi</div><div
class="gmail_extra"><br></div><div class="gmail_extra">We saw something
very similar to this a couple of years ago. In our case, it was caused by
STP being enabled on our hypervisors.</div><div
class="gmail_extra"><br></div><div class="gmail_extra">HTH</div><div
class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div
class="gmail_extra"><br><div class="gmail_quote">On 3 Oct. 2017 04:56,
"Derek Atkins" <<a href="mailto:derek@ihtfp.com"
target="_blank">derek@ihtfp.com</a>> wrote:<br
type="attribution"><blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I'm at my wits end so I'm tossing this here in the hopes that
SOMEONE<br>
will be able to help me.<br>
<br>
tl;dr: Ovirt is doing something on my network that is causing my fiber<br>
modem to go from 3-5ms to 300-1000+ms round trip times. I know it's<br>
ovirt because when I unplug ovirt from my network the issue goes away;<br>
when I plug it back in, the issue recurs.<br>
<br>
Long version:<br>
<br>
I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months<br>
on a single host machine. Indeed, the host had an uptime of 200+ days<br>
and was working great until approximately midnight, September 21/22<br>
(just over a week ago). I was on an airplane halfway across the<br>
Atlantic at that time, so it wasn't anything I did.<br>
<br>
My network is configured as:<br>
<br>
fiber modem <-> edgerouter <-> switch <-> everything
else<br>
<br>
ovirt is living in the "everything else" area.<br>
<br>
When I sit with a laptop connected to either the everything else range<br>
or even directly connected to the fiber modem, I run 'mtr' and see<br>
network times (starting at the fiber modem) that bounce all over the<br>
place. When I unplug ovirt I see consistent 3-5ms times. Plug it back<br>
in, voom, back up to badness.<br>
<br>
I've spent several hours plugging and unplugging different devices<br>
trying to isolate the issue. The only "device" that has any
effect is<br>
my ovirt box.<br>
<br>
I have tried to debug this in several ways, but really the only thing<br>
that seems to have helped at all is shutting down all the VMs and the<br>
hosted engine. Once nothing else is running (but the host itself), only<br>
then does the network seem to return to normal.<br>
<br>
I'm really at my wits end on this; I have no idea what is causing this<br>
or what might have changed to cause the issue right at that time. I<br>
also can't imagine what ovirt is doing over the network that could
cause<br>
the modem, two physical hops away, to lose its mind in this way. But my<br>
experiementation is definitely showing a direct correlation.<br>
<br>
Help!!<br>
<br>
-derek<br>
<br>
--<br>
Derek Atkins <a href="tel:(617)%20623-3745"
value="+16176233745" target="_blank">617-623-3745</a><br>
<a href="mailto:derek@ihtfp.com"
target="_blank">derek@ihtfp.com</a> <a
href="http://www.ihtfp.com" rel="noreferrer"
target="_blank">www.ihtfp.com</a><br>
Computer and Internet Security Consultant<br>
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</blockquote></div></div>
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