Observe the following restrictions when you use the retro change log:
A master replica running this version of Directory Server cannot be a supplier to a consumer replica running Directory Server 4.x.
In a replicated topology, the retro change logs on replicated servers must be up-to-date with each other. This allows switchover of the retro change log. Using the example in Failover of the Retro Change Log, the last CSN for each replica ID on RCL3 must be present on RCL2.