1. Server chaining feature in OID is introduced in version 10.1.4.0.1
2. You use server chaining feature to map user/group/entries sitting in third party LDAP directory (AD, iPlanet) and access them through OID. This way you can avoid synchronization of entry (identity data) between OID and third party LDAP Server.
3. Currently (as of version 10.1.4.0.1) only Microsoft Active Directory & Sun iPlanet are supported for OID server chaining (as shown in figure above)
4. Currently only bind, compare(only for userpasswd attribute), modify and search ldap operation are supported
5. You can configure server chaining either from command line (ldap commands) or using OIDADMIN (gui tool to administer OID)
6. If attribute name in OID is same as attribute name in third party ldap server (iPlanet, AD) then mapping is not required (some attributes are mapped by default - orclguid, krbprincipalname)
7. Operation attributes, objects classes and OID specific attributes (starting with orcl) cannot be mapped using server chaining framework
Related Doc
OID Server Chaining guide from Oracle
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Good hands-on exercises (installation, patching, cloning), very experienced trainer worth for Money 
1 user commented in " Server Chaining in OID "
Follow-up comment rss or Leave a Trackbackhi Atul,
this topic is very minimal can you be much more detailed on this on how to sync different AD to OID and how to check if the OID is connected to AD and in sync
thanks,
Vamshi D
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