Using one rman catalog to backup primary database and another catalogs to backup standby database
I had two datacenters, one for primary database and other for standby database. We are using RAC database 11.2.0.3.
This datacenters can't share backups because they are in different cities far about 500 miles. So we decided use one rman catalog for standby datacenter and another rman catalog for primary datacenter.
I think I must register primary database in both catalogs because I can't register in catalog standby database. But, I'm worried about performance: If I register primary database in both catalogs, when I try to backup standby may I have problems with sync catalog?
Can I made backups for standby database without register primary database in this catalog? In this case, If we made a swichover and change roles from primary to standby, Can I continue making backups in standby rman catalog for my new primary database ?