There are specific configuration and node-specific connection methods required to use to perform NDMP backup on an SVM DR. Essentially you must connect directly to the node via the Cluster Management LIF that hosts the volume that is owned by the SVM DR as the DATA LIF for the SVM DR will not be accessible.
Below is a KB that explains briefly NDMP architecture and what conditions where it will and will NOT work on an SVM DR:
NDMP Backup on SVM DR
To enable node-scope NDMP:
Enable node-scope NDMP
Regards,
Team NetApp
Team NetApp