We had two X450a with core licence connected directly with a cable that was user for OSPFv3 peering. that worked perfectly.
Now we had to put some other extreme switches in the middle that transport this via a VMAN. since then OSPFv3 state is EX_START which is not good.
The two X450a can ping themself using IPv4 and V6 so L2 seems good.
OSPF (for IPv4) works.
Link is in broadcast mode and i tried several MTU settings.
I have XOS 12.3.
Is it a software issue that would be fixed with 15.* or is there something else you can see ?
Any idea will be welcomed. But I don't want to update XOS just to give it a try, these devices are sensitive.