Replication Server creates a row for each primary and replicate connection in the rs_databases table and has a column—conn_id to uniquely identify the primary or replicate connection in a particular row.
Replication Server uses the dsname and dbname columns to identify an alternate connection by the connection name and identifies the default primary or replicate connection by the data server and database names. dbid identifies the ID of the database that the connection connects to. If the row is for a default connection, connid is equal to the dbid. If the row is for an alternate connection, connid is not equal to the dbid. See Replication Server Reference Manual > Replication Server System Tables.