11gr2 rac tns file example

remote listener redirect the request from client to local listener.

also can connect the database by local listener directly

 

remote listener

RAC12 =
   (DESCRIPTION =
     (ADDRESS = (PROTOCOL = TCP)(HOST = scan2.hisoft.com)(PORT = 1531))
     (CONNECT_DATA =
       (SERVER = DEDICATED)
       (SERVICE_NAME = RAC12)
      )
    )

 

local listener:

RAC121=
        (DESCRIPTION=
                (ADDRESS=(PROTOCOL=tcp)(HOST=rac3-vip)(PORT=1534))
            (CONNECT_DATA=
                (SERVICE_NAME = RAC12)
            )
        )
RAC122=
        (DESCRIPTION=
                (ADDRESS=(PROTOCOL=tcp)(HOST=rac5-vip)(PORT=1534))
            (CONNECT_DATA=
                 (SERVER = DEDICATED)
                (SERVICE_NAME = RAC12)
            )
        )