depends also how your hosts are setup... if you have 2 hba ports on the host then you can have each host go to both fabrics to both zones. If you have one HBA port on the guest then that changes things.
The interconnect is used and you can see the hosts logged in with igroup show and seeing them logged in the vtic. that is the interconnect connection through the controller that doesn't own the lun.
The fabrics would stay separate. The host (needs MPIO setup) would see 2 paths. One through fabric A and the other through fabric B. Usually a zone is setup per initiator… so if there are 10 hosts, you would have 10 zones on fabric A (each zone with that host and the target port…the netapp target port in each zone).
Your MPIO setup should see both paths through fabric A/B when done and you can see the vtic login on the controller. The controller that owns the lun is the primary path and the other controller a secondary path.