I’m hitting this bug as we speak on some of my Sol10 and Sol11 LDoms running on an Oracle VM 3.1.1.
You might want to check this topic:
Virtual Network LDC Handshake Issues Seen When There Are a Large Number of Virtual Network Devices Present
http://docs.oracle.com/cd/E38405_01/html/E38409/bugsaffectingldoms.html
Regards,