Controlfile Name in ASM while creating Standby database

Hi,

I have created standby database in ASM. But I noticed that controlfile name is backup.nnn.nnnnn . It should be current.nnn.nnnn.

The steps are:

On primary:

SQL> alter database backup controlfile for standby to '/tmp/stby.ctl' ;

On standby the control_files parameter is : control_files=+DSKGRP, +DSKGRP

On standby :

RMAN> restore controlfile from '/tmp.stby.ctl' ;

I saw the file name created with name backup.nnn.nnnn instead of current.nnn.nnnn which usually happens.

Why isn't it current.nnn.nnnn in case of standby. I don't want to change the name manually.