Hi,
best practise is to have OA, VC as well as blade iLOs in the same subnet, however separated from production networks.
You can change them anytime without impact to the blades or VC functions...
1. assign fixed new IPs to both OAs
2. assign IPs for VCs and iLOs (same subnet as for both OAs!) in OA GUI by setup a range -> Enclosure Settings -> Enclosure Bay IP addressing -> IPv4 -> Device Bays / Interconnect Bays.
OA will provide assigned IPs to VC and iLOs in a kind of DHCP (EBIPA)
Have success
/br
Albert