Data Domain Migration with networker.

Hello all , 

My current setup is as below : 

There are two DD systems(DD2500 , DDOS : 5.7.2),one in Production site and another one in DR site . Replication is enabled. We are planning to purchase new DD6300 for Production site. Then we shift existing DD2500 in Production site to DR site (After moving all data to new DD6300). After this setup will be DD6300 in Production site and Two DD2500 in DR site. Replication is enabled. Backup software used is Networker and mainly RMAN oracle backup and VM backups are there.

Highly appreciate your any advise to achieve above tasks ,

* Can I do a collection replication to copy all the data from DD2500 to DD6300 and use DD6300 in primary site.  Do I need migration license for that.  ?    Is destination site read-only after the collection replication.

* Which configurations do I have to do in Networker software.

*What is the best way to copy all data from DD2500 to DD6300 ?

Thank you very much.