This figure shows the Identity Management Tier configuration in the Web Tier and Data Tier DMZs. In the uppermost tier, the Web Tier, the two Identity Management computers (IDMHOST1 and IDMHOST2) receive calls from the external Load Balancing Router on port 7777, and communicate on ports 389 and 636 with the Oracle Internet Directory load balancer, oid.mycompany.com:389/636 in the Data Tier DMZ. The Identity Management computers host the following software components: Oracle HTTP Server, OracleAS Single Sign-On, and Oracle Delegated Administration Services.

The internal load balancer oid.mycompany.com:389/636 balances traffic to the two Oracle Internet Directory server computers OIDHOST1 and OIDHOST2. They host the Oracle Internet Directory processes, and communicate with the database computers INFRADBHOST1 and INFRADBHOST2 on port 1521.