Integrating ONS 11g from CRS for FCF With OPMN From OracleAS 10g Release 3 Shows Incorrect Entries for Both Topologies (Doc ID 1454535.1)

Last updated on JANUARY 18, 2017

Applies to:

Oracle Fusion Middleware - Version 10.1.3.1.0 to 10.1.3.5.1 [Release AS10gR3]
Generic UNIX
Oracle Fusion Middleware 10.1.3.5.0
Oracle RAC Database version 10.2.0.4.0
Oracle Cluster Ready Services (OCRS) version 11.2.0.2.0

Symptoms

An Oracle Application Server (AS) 10g Release 3 Cluster Topology has been configured to connect to an Oracle Real Application Clusters (RAC)11g Release 2 database using Fast Connection Failover.
Fast Connection Failover (FCF) makes use of Oracle Notification Server (ONS) to proactively notify the AS data source of database instance availability via Oracle Cluster Ready Services (OCRS).

When two ONS servers are configured to connect to one another, then any ONS servers to which they are connected are indirectly connected to one another as well, effectively making the 11.2 OPMN a bridge that joins the database ONS to the AS topology. All ONS servers become part of a single topology spanning AS and the database.

This has the unintended consequence that the RAC ONS tries to discover all AS instances in the topology, including OHS instances and can cause problems with the AS cluster topology.
This also causes problems in Enterprise Manager because it tries to show all other AS 10g instances from remote installations.

For AS 10g instances execute:

 
If the output shows remote RAC instances then this issue has been encountered.

Changes

Trying to configure ONS to enable FCF between AS 10g (10.1.3.x) and a OCRS 11.2.0.2.

Cause

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