I have an active SUP [WS-X6K-SUP2-2GE] in 6509 Switch. Management decided to add another SUP for failover and purchased WS-X6K-S2-PFC2 . I see the model numbers are different and wondering if the failover works properly? I rememebr studying sometime back that to run failover on SUPs , they need to run same model and IOS version.? Could someone answer or share any documents related to this question?