[ovs-discuss] How to migrate from linux bridge to OVS with shortest data-plane break

[Andrey Korolyov]

On 05/26/2014 06:44 PM, Han Zhou wrote:
> Hi,
> 
> We want to upgrade from linux bridge to OVS bridge on hypervisors
> (QEMU/KVM + libvirt) without data-plane outage (at least without VM
> restart). I think this might have been done by experts here. Is there
> a way to use same TAP interface but let OVS take it over from linux
> bridge at runtime? Or is there a way to detach old TAP and then attach
> newly created TAP to VM's eth0? Any suggestions are appreciated!
> 
> Best regards,
> Han

Hi,

not sure if it was right list to ask, but you can detach interfaces via
brctl from the regular bridge and reattach to the ovs bridge using
'ovs-vsctl add-port'. And you`ll need to update libvirt config accordingly.

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