Re: [ovirt-users] Ovirt causing strange network issues?

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&gt; wrote: > Hi > > 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. > > HTH > > > > On 3 Oct. 2017 04:56, "Derek Atkins" <derek(a)ihtfp.com&gt; 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. 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 >> 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). I was on an airplane halfway across the >> Atlantic at that time, so it wasn't anything I did. >> >> My network is configured as: >> >> fiber modem <-> edgerouter <-> switch <-> everything 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 >> network times (starting at the fiber modem) that bounce all over the >> place. When I unplug ovirt I see consistent 3-5ms times. Plug it back >> in, voom, back up to badness. >> >> I've spent several hours plugging and unplugging different devices >> trying to isolate the issue. 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. Once nothing else is running (but the host itself), only >> 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 >> or what might have changed to cause the issue right at that time. 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. But my >> experiementation is definitely showing a direct correlation. >> >> Help!! >> >> -derek >> >> -- >> Derek Atkins 617-623-3745 <(617)%20623-3745> >> derek(a)ihtfp.com www.ihtfp.com >> Computer and Internet Security Consultant >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> >