Request failover between Load Balancer and OAS 10.1.3.3

Hello,
I have a Load Balancer hardware "Cisco 11500 content service"
Working on 4 applications server OAS 10.1.3.3 on the oracle enterprise lunix
We are using Oracle HTTP Server And deployed application Under (j2ee) I am using Cluster between them "instant” as the same on all 4 servers
If an OC4J process goes down between requests, then this module is able to hide that failure from the end user by transparently routing the next request to another OC4J that is available within the same group of JVM.
BUT when I shutdown the opmn the Load Balancer Hardware is still sending that requests to the opmn that is already down
How can I configure or fix that request that is common to that opmn stopped process
Do you have the solution to solve this issue?
Thanks.
Regards.
Moataz

Dear All,
Will appreciate if someone can answer this. Please let me know.........
Regards
Moataz Alem

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