Can you provide more details on how your network is arranged for the Mgmt Cluster?
What all VLANs are uplinked to the DVS? Are you essentially using Distributed Port Groups for the subnets such as Mgmt Network etc? Perhaps a simple diagram of your network layout....
I want to check if there is a way to do something at the DVS/Port Group level so that we can expand the available IP set.
I will take note of requirement for ability to switch networks for VIO ... but in general for prod deployment we don't come across this requirement.
arvind