Let me share with you the LDAP configuration.
User Directory Subtree:
cn=users,dc=x,dc=y,dc=edu
Group Directory Subtree:
cn=groups,dc=x,dc=y,dc=edu
User Object Type: uid
User Object Class: Person
Group Object Type: cn
Group Object Class: posixGroup
Group Attribute Name: memberUID
We are using LDAP v3 and its working.
Thanks and Regards
Gautam