MAC address collisions can cause a number of problems for logical domains. I've seen a few questions recently about how Ops Center allocates MAC addresses and how you can avoid or fix collisions, so I thought I'd address a few of them.
"How does Ops Center allocate MAC addresses?"
Ops Center uses the automatic range (00:14:4F:F8:00:00 - 00:14:4F:FB:FF:FF) to allocate MAC addresses to logical domains and network devices. You can use the manual range (00:14:4F:FC:00:00 - 00:14:4F:FF:FF:FF) for LDoms that you create manually.
"Is there a way to make sure that a MAC address won't have a collision before I bring it into Ops Center?"
The CLI can do this with the collisions mode. The list subcommand lists all known collisions, and the check subcommand checks to see if the specified IDs or addresses would have a collision.
"Does the UI keep track of all manually allocated MAC addresses?"
No, that information isn't collected in the UI.