As of version 0.10.0 of libvirt, transparent VLAN tagging is fully supported with Open vSwitch (OVS). This feature allow to transparently forward tagged VM traffic to the ethernet network, providing functionality similar to a switch's VLAN trunk. Transparent VLAN tagging is particularly interesting if you want to directly and easily terminates VLANs on your virtual machines (say virtual routers or gateways), while keeping your host configuration as simple as possible, and so without messing up with tens or even hundreds of bridges.
This week was mostly dedicated to deploy a two-nodes OpenStack testing environment. I wanted to evaluate this famous cloud platform so many people are talking about. My first impressions were quite positive, unfortunately I am relatively disappointed with the network part of the IaaS platform due to a large number of open issues.