Microsoft Identity Manager - Multi Subnet Failover

Hi Everyone,
i'm currently facing the problem, that i have to administrate a microsoft identity manager, which syncs Mailboxes as contacts between two forest.
Since i'm kinda new to this program i'm failing to configure the sql-server-cluster, which is a multi-subnet-failover-cluster. Whenever a sql-failover happens, MIM stops working (Synchronization stops and within the eventlog some sql-connection errors appear). It then goes to the next step and fails too.
So my question: Where do i configure the multi subnet failover?
I didn't find useful information in the internet. I'm using the sql native client 11 on the machine, which technically is able to use multi subnet failover.
Thank you in advance.
BR,
Sebastian Pohl