[Rdo-list] Icehouse multi-node - Centos7 - live migration failed because of "network qbr no such device"

Hello, I'm working on a multi-node setup of openstack Icehouse using centos7. Well i have : - one controllor node with all server services thing stuff - one network node with openvswitch agent, l3-agent, dhcp-agent - two compute node with nova-compute and neutron-openvswitch - one storage nfs node NetworkManager is deleted on compute nodes and network node. My network use is configured to use vxlan. I can create VM, tenant-network, external-network, routeur, assign floating-ip to VM, push ssh-key into VM, create volume from glance image, etc... Evrything is conected and reacheable. Pretty cool :) But when i try to migrate VM things go wrong ... I have configured nova, libvirtd and qemu to use migration through libvirt-tcp. I have create and exchanged ssh-key for nova user on all node. I have verified userid and groupid of nova. Well nova-compute log, on the target compute node, : 2014-07-11 11:45:02.749 6984 TRACE nova.compute.manager [instance: a5326fe1-4faa-4347-ba29-159fce26a85c] RemoteError: Remote error: Unauthorized {"error": {"m essage": "The request you have made requires authentication.", "code": 401, "title": "Unauthorized"}} So well after searching a lots in all logs, i have fount that i cant simply migration VM between compute node with a simple virsh : virsh migrate instance-00000084 qemu+tcp://<dest>/system The error is : erreur :Cannot get interface MTU on 'qbr3ca65809-05': No such device Well when i look on the source hyperviseur the bridge "qbr3ca65809" exists and have a network tap device. And moreover i manually create qbr3ca65809 on the target hypervisor, virsh migrate succed ! Can you help me plz ? What can i do wrong ? Perhpas neutron must create the bridge before migration but didnt for a mis configuration ? Plz ask anything you need ! Thank you in advance. The full nova-compute log attached. Regards, -- -- Benoit