For the interaction between a Replication Agent and a Replication Server, the only interface file entry that may be required is one that identifies the Replication Server.
The Replication Agent for DB2 UDB does not require an interface file. The Replication Server and RSSD location, if needed, is in the LTMCFG file.
The Replication Agent (for DB2 UDB on UNIX and Windows platforms, Microsoft SQL Server, and Oracle) does not require an interface file entry, as it records the Replication Server host name and port number in configuration parameters.