[libvirt-users] Cannot get interface MTU - qemu quest fails to start off OpenVswitch

lejeczek peljasz at yahoo.co.uk
Fri May 10 16:23:59 UTC 2019

On 10/05/2019 14:44, Michal Privoznik wrote:
> On 5/10/19 3:26 PM, lejeczek wrote:
>> hi guys
>> I have a qemu guest and openvswitch bridge and the guest fails to start:
>> $ virsh start work8
>> error: Failed to start domain work8-vm-win2016
>> error: Cannot get interface MTU on 'ovsbr0': No such device
> Well, this means that 'ovsbr0' doesn't exist. Is that so? Can you
> share your <interface/> configuration and the network XML?
> Michal

so if your libvirt's net is like this:

  <forward mode='bridge'/>
  <bridge name='ovsbr0'/>
  <virtualport type='openvswitch'/>

then you need extra(extra for ovs tools create both for us at bridge
creation time and nmcli(you) need to create those explicitly) port+iface
so this:

$ ovs-vsctl show

output will contain this:


Port "ovsbr0"
            Interface "ovsbr0"
                type: internal


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