From RAC to Standby RAC With Active Dataguard I have oracle  database 11.2.0.3 with RAC feature  , with 2 node on oracle linux 6.4 :

ol6-112-rac1 and ol6-112-rac2


I want to create active data guard with RAC feature from this database , these active dataguard with rac option has 2 node :

ol6-rac1-guard,ol6-rac2-guard


I want to use this document for creation active data guard from rac database to rac database :

http://www.oracledba.org/11gR2/dr/11gR2_dataguard_RAC_to_RAC.html#Create_Physical_Standby

I do the steps in this document , all of things is ok but in step " Start
the Managed Recovery Process "  after i want to switch log in primary ,
switch log is not occurred on standby database .
After " tail of alert log " on standby database and  executing " Switch log " on primary , this error is occurred :

tail -f  /ora01/app/oracle/diag/rdbms/racguard/racguard1/trace/alert_racguard1.log
Wed Feb 17 04:37:57 2016
Media Recovery Waiting for thread 1 sequence 76
Error 12154 received logging on to the standby
FAL[client, USER]: Error 12154 connecting to rac for fetching gap sequence


This is my mistake , can any one help me ?
In your tnsnames.ora on the standby side the needed tns alias for 'rac' is missing. In a data guard configuration it is extremely important that all members can resolve all other members.