The server side on OpenLDAP is implemented via an overlay: [http://www.openldap.org/software/man.cgi?query=slapo-sssvlv&apropos=0&sektion=0&manpath=OpenLDAP+2.4-Release&format=html slapo-sssvlv] - Server Side Sorting and Virtual List View overlay for slapd.
Example Search with ordering server side sorting (ascending):
<pre>
ldapsearch -H ldaps://ldapm.stoney-cloud.org \
</pre>
Example Search with ordering server side sorting (descending: check the "-" before the attribute uid):
<pre>
ldapsearch -H ldaps://ldapm.stoney-cloud.org \