KVM Bridge Problem

is this only my mistake,or can help any from the list?

I have 3 host computer on different places, but all have the Problem when
starting a client "KVM" to connect to the bridge from the host.

It is near not possible to start a client, only after 10-20 reboot/restart
from the client's the network is starting correct?

Is this only on my computers or have other also this Problem?

Is the bridge software is broken ?

Can I use openvswitch to replace bridge Software?

Any help are welcome ;-)


Re: KVM Bridge Problem

By Alexander Dalloz at 12/04/2018 - 16:59

Am 04.12.2018 um 21:30 schrieb G√ľnther J. Niederwimmer:
Logs are the only source of truth. Without them everything is pure

What does your system report in the relevant log files?

Sure you can. It takes a bit more effort to setup openvswitch. It can be
worth it depending on your network design.

First of all it would be necessary from your side to provide details
about your setup. Running KVM with a bridge setup is not enough info.

Get your config sorted and the logs.


Re: KVM Bridge Problem

By =?ISO-8859-1?Q?... at 12/05/2018 - 09:41

Hello List,

thanks for the answer

Am Dienstag, 4. Dezember 2018, 21:59:58 CET schrieb Alexander Dalloz:
this are the Error log
[ INFO ] Network Manager is not active.
[DEPEND] Dependency failed for Network Manager Wait Online.
Starting LSB: Bring up/down networking...
[FAILED] Failed to start LSB: Bring up/down networking.
See 'systemctl status network.service' for details.

A "systemctl restart network" ends with a error

I mean without NetworkManager I have always this Error in KVM Clients now,
with Update 1810 ?

I have found a workaround for me in the Momemt.
I enable NetworManager on boot and disable NetworkManager in the ifcfg-ethX

Now the most time the clients are starting with a working Network ??

Re: KVM Bridge Problem

By Steven Tardy at 12/04/2018 - 22:31

KVM/Linux bridging often defaults to have spanning tree enabled which many
switches do not like.
Try creating the bridge and disable spanning tree?