Found this bug: http://bugs.opensolaris.org/view_bug.do?bug_id=6797256
snooping the virtual interconnect did show VLAN tagged packets being sent. After uninstalling 138888-01 and -07, both on control and guest domains, both ldoms cluster nodes were able to join the cluster. I did open a case with Sun for this (found the bug before they did), but they did inform me that a patch is almost available. -- This message posted from opensolaris.org
