Once your circle of trust is established by providing target Platform Deployments with the root certificates of source Platform Deployments, you need to configure the topology by setting up the relationship in Access Federation.
Example 1: Set Up a Star Topology
Consider the scenario where three Access services should be set up in a Star topology where Access-A synchronizes to Access-B and Access-C.
In this case, you need to provide Access-B and Access-C the root certificate of Access-A so that A becomes trusted by B and C.
Example 2: Setting Up A Full Mesh Topology
Consider the scenario where three Access services should be set up in a Full Mesh topology where each service should be able to synchronize changes to security entities to both other services.
In this case, you need to provide each Access service with the root certificates of both other services so that both are trusted.