How do implement listener in the new oracle home after upgrading the EBS DB to 11gr2.
DB in the new server now
Copy the listener.ora file from the old ORACLE_HOME to the new ORACLE_HOME and edit the path. Or, you could simply run netca from the new ORACLE_HOME.
Interoperability Notes Oracle EBS 11i with Oracle Database 11gR2 (11.2.0) [ID 881505.1] -- Start the new database listener (conditional)
Interoperability Notes EBS 12.0 and 12.1 with Database 11gR2 [ID 1058763.1] -- Start the new database listener (conditional)