Hi, Does anyone know of a way to get around this problem. I have several long running VMs running on an Ubuntu 14.10 host and for some reason I am getting errors when trying to migrate them to another host. If I restart the VM then the problem does not exist, however for various reasons that is not an option with the remaining VMs. root@comp001:~# /root/bin/vm_migrate.sh ws001 comp003 virsh migrate --live --persistent --tunneled --p2p --unsafe --domain ws001 --desturi qemu+tcp://comp003/system error: internal error: No <source> 'bridge' attribute specified with <interface type='bridge'/> I have eventually figure out that the problem is not with the XML definitions for the host, but is related to the details of the network interfaces assigned to the host as output by the virsh domiflist command. The question I need to resolve is how do I populate the missing Source information. Any help gratefully appreciated. Kind regards Carl Taylor root@comp001:~# libvirtd --version libvirtd (libvirt) 1.2.8 root@comp001:~# virsh domiflist --inactive ws001 Interface Type Source Model MAC ------------------------------------------------------- - network br300 virtio 52:54:00:62:9b:20 - network br201 virtio 52:54:00:f0:73:85 - network default virtio 52:54:00:69:b1:e5 root@comp001:~# virsh domiflist ws001 Interface Type Source Model MAC ------------------------------------------------------- vnet18 bridge - virtio 52:54:00:62:9b:20 vnet19 bridge - virtio 52:54:00:f0:73:85 vnet20 network default virtio 52:54:00:69:b1:e5