Backing Up NFS datastores over storage fabric

Good Day,

I am currently backing up my VMWare environment using NetBackup 7.5.0.4 SAN Transport method utilizing iSCSI datastores on a NetApp filer.  I am wanting to set up NFS datastores and back these up within NetBackup but I can't seem to get the traffic for these transport types to traverse the storage fabric.

Is there a way to keep this backup traffic off of my production network and have NetBackup utilize the dedicated storage network for NFS volumes?

My Netbackup master/media server is a standalone server with network connections to the storage and production fabrics.

Thanks