Overview#Distributed Reference Links (DRL) manage references throughout the NDS tree and are automatically maintained by the NDS Backlinker Process.
Distributed Reference Links (DRLs) work with NDS External References to maintain connectivity in the eDirectory tree.
The BackLinks required a server to communicate with every server that contains a read/write replica of the partition the BackLink resides on. When information is needed about a DRL, any server with a replica of the partition can supply the information.
For backward compatibility with NetWare 4.x servers, eDirectory maintains BackLink with NetWare 4.x servers. However, these servers must be running at least NDS version 599a in a mixed NetWare 4.x and NetWare 5.x network.