About MSDP pull duplication within the same domain
Figure: Pull duplication shows a pull configuration for optimized duplication within the same domain. Deduplication node A contains normal backups; deduplication node B is the destination for the optimized duplication copies. Host B has credentials for both nodes; it is the common server.
Figure: Pull duplication storage unit settings shows the storage unit settings for the duplication destination. They are similar to the push example except host B is selected. Host B is the common server, so it must be selected in the storage unit.
If you use node B for backups also, select host B and not host A in the storage unit for the node B backups. If you select host A, it becomes a load balancing server for the node B deduplication pool.