I'm sorry. What is STP?
And how do I turn that off?

-derek
Sent using my mobile device. Please excuse any typos.

On October 2, 2017 7:41:15 PM Colin Coe <colin.coe(a)gmail.com> wrote:

Hi

We saw something very similar to this a couple of years ago.=C2=A0 In our case, it was cause= d by STP being enabled on our hypervisors.

HTH

On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com> wrote:
Hi,=

I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.

tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times.=C2=A0 I know it'= ;s
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.

Long version:

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
and was working great until approximately midnight, September 21/22
(just over a week ago).=C2=A0 I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.

My network is configured as:

=C2=A0 fiber modem <-> edgerouter <-> switch <-> everythi= ng else

ovirt is living in the "everything else" area.

When I sit with a laptop connected to either the everything else range
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
place.=C2=A0 When I unplug ovirt I see consistent 3-5ms times.=C2=A0 Plug i= t back
in, voom, back up to badness.

I've spent several hours plugging and unplugging different devices
trying to isolate the issue.=C2=A0 The only "device" that has any effect is
my ovirt box.

I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine.=C2=A0 Once nothing else is running (but the host itself), on= ly
then does the network seem to return to normal.

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.=C2=A0 I also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way.=C2=A0 But = my
experiementation is definitely showing a direct correlation.

Help!!

-derek

--
=C2=A0 =C2=A0 =C2=A0 =C2=A0Derek Atkins=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0617-623-3745
=C2=A0 =C2=A0 =C2=A0 =C2=A0derek(a)ihtfp.com=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0www.ihtfp.com
=C2=A0 =C2=A0 =C2=A0 =C2=A0Computer and Internet Security Consultant
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