We are kicking off one project named 'Ethernet bridging' to make Solaris virtualization ready, particularly ready to be Xen domain0. Basically an Ethernet bridge enable Xen domain0 to work as a 802.1D bridge to the other Xen user domains.
In paralell, we kicked off one CDDL open source project for it, which is hosted in
http://www.opensolaris.org/os/project/ethbridge

