Question: how to configure dgmgrl in oracle 12c?
Answer: Set dg_broker_start to true [ ON BOTH PRIMARY AND STANDBY DB] POCDB> alter system set dg_broker_start=true sid='*'; ... 
Add primary db configuration [ ON PRIMARY] $dgmgrl. ... 
Add standby configuration [ ON PRIMARY ] DGMGRL> add database POCDSBY as connect identifier is POCDSBY; ... 
Enable configuration: [ ON PRIMARY]