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,