On 08/03/2016 10:25 AM, Silvia Fichera wrote:

Hi all, I have installed OpenStack using devstack, when I try to launch an instance I have an error related to libvirt: libvirtError: Cannot get interface MTU on 'br-int'

and this don't allow to create a VM. Any hint to solve it?

This message is logged when libvirt tries to call ioctl(SIOCGIFMTU) for the device "br-int". Not having any further information about your networking setup, I can't say why that might be, but this should give you a starting point to investigate.