LDAP Protocol Mechanisms are "officially" defined in the Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)
by RFC 4520
LDAP provides Discovery Mechanism through a number of Root DSA-Specific Entry (DSE) attributes for discovery of protocol mechanisms identified by OIDs.
An IANA Registry it the "official" place where LDAP Protocol Mechanisms are supposed ot be registered Protocol Mechanisms
We outline them below:
These attributes RFC 4512 that identify protocol mechanisms include:
We have a much more extensive LDAP Extensions and Controls Listing than provided in the IANA Registry
There might be more information for this subject on one of the following: