question is:
Is it the same procedure to create catalog and register database for RAC DB with 2 nodes as of Single Production DB.
If the archived redologs are on the clustered filesystems (and i
strongly advise you to use a clustered file system) and both the nodes
can see the filesystem and it is properly configured then yes
BACKUP DATABASE PLUS ARCHIVELOG DELETE INPUT;
This will work perfectly
Refercenes:
RMAN Configuration for 2 nodes RAC Database