I have one FAS2554(Data Ontap 8.3.1) and AFF8040(Data Ontap 9.1) at site A and would like to snapvault to an FAS2254(Ontap 9.1) at site B. It should be OK, but I wonder if it can revert the direction from site B back to site A without upgrade FAS2554 (Data Ontap 8.3.1) . I cannot find the peering requiement from the Ontap 9 document. Please help~