This deployment is useful if you want to logically group redundant OpenSSO Enterprise servers in a LAN or WAN environment. For example, you can configure redundant OpenSSO Enterprise servers to work as a single unit under a single site identifier. The redundant OpenSSO Enterprise servers provide one level of system failover. When you deploy multiple sites this way, the OpenSSO Enterprise servers in one site are logically isolated from the OpenSSO Enterprise servers in other sites.
In this example, both OpenSSO Enterprise server load balancers are specified in each Policy Agent bootstrap configuration. The load balancers are also configured as login URL's in each Policy Agent configuration. Policy Agent configuration can reside on the same host as the Policy Agent, or can reside in the OpenSSO Enterprise embedded configuration data store. When system failure occurs at the load balancer, one site fails over to another site.
The following figure illustrates minimum components required for a multiple-site configuration.
The following figure illustrates the session handling part of the process flow. See Figure 17–2 for a detailed illustration of steps 1 through 13.