Referrals are also affected if you migrate a master replica to a new host or port. The details of each master in a topology are present in the Replica Update Vector (RUV) of all other servers in the topology. The RUV of each server is used to determine the referrals. When you change the host name or port number of a master server during migration, all referrals to that master from other servers in the topology become invalid. The easiest way to correct this is to use the following steps, in order, when performing the migration.
Before migrating a master server, verify that there are no pending changes to be replicated. You can use the insync tool to do this.
Demote the master server to a hub, as described in Promoting or Demoting Replicas in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition.
Migrate the hub server, either using dsmig or the manual migration progress.
Promote the hub server to a master, as described in Promoting or Demoting Replicas in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition. When you promote the hub, you must assign a replicaID to the new migrated master. This new replicaID must be different to the replicaID of the old server that is being migrated, and must be unique within the replicated topology.