Determining the Server Role
Steel-Belted Radius Carrier software can be installed as a stand-alone server, as the primary server in a group of replication servers, or as a replica.
If you are installing in an environment that uses replica servers, make sure that the primary server is fully functional before installing any replicas — the replica servers need to communicate with the primary server during installation and when they start.
5.4, 6.0, 6.1
If you are migrating from an earlier SBR release to Release 7.0, both servers must be the same type. For example, a SIM Server 5.4 primary server can be migrated forward to create a Release 7.0 primary server. Or a stand-alone configuration can be used to set up a new stand-alone. But cross-type migration is not supported.