[ovirt-users] Problemas with ovirtmgmt network used to connect VMs

[Edward Haas]

On Tue, Jul 25, 2017 at 12:20 AM, FERNANDO FREDIANI <
fernando.frediani at upx.com> wrote:

> Hello Edward, this happened again today and I was able to check more
> details.
>
> So:
>
> - The VM stopped passing any network traffic.
> - Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac address
> missing.
> - I then went to oVirt Engine, under VM's 'Network Interfaces' tab,
> clicked Edit and changed the Link State to Down then to Up and it recovered
> its connectivity.
> - Another 'brctl showmacs ovirtmgmt' showed the VM's mac address learned
> again by the bridge.
>
> This Node server has the particularity of sharing the ovirtmgmt with VMs.
> Could it possibly be the cause of the issue in any way ?
>
There is nothing special with ovirtmgmt bridge in this regard.
I suggest you check the VM itself to see if it tries to send traffic, the
fact that the mac is not appearing on the bridge table is an outcome of no
traffic passing from the vNIC with that source mac address.

Thanks
> Fernando
>
> On 24/07/2017 09:47, FERNANDO FREDIANI wrote:
>
> Not tried this yet Edwardh, but will do at next time it happens. THe
> source mac address should be the mac as the VM. I don't see any reason for
> it to change from within the VM ou outside.
>
> What type of things would make the bridge stop learning a given VM mac
> address ?
>
> Fernando
>
> On 23/07/2017 07:51, Edward Haas wrote:
>
> Have you tried to use tcpdump at the VM vNIC to examine if there is
> traffic trying to get out from there? And with what source mac address?
>
> Thanks,
> Edy,
>
> On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI <
> fernando.frediani at upx.com> wrote:
>
>> Has anyone had problem when using the ovirtmgmt bridge to connect VMs ?
>>
>> I am still facing a bizarre problem where some VMs connected to this
>> bridge stop passing traffic. Checking the problem further I see its mac
>> address stops being learned by the bridge and the problem is resolved only
>> with a VM reboot.
>>
>> When I last saw the problem I run brctl showmacs ovirtmgmt and it shows
>> me the VM's mac adress with agening timer 200.19. After the VM reboot I see
>> the same mac with agening timer 0.00.
>> I don't see it in another environment where the ovirtmgmt is not used for
>> VMs.
>>
>> Does anyone have any clue about this type of behavior ?
>>
>> Fernando
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
>
>
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