by Ken Task.
Have a look in your moodle code folder ... auth/ldap/cli/
There resides sync_users.php script.
which could be executed either via command line or via cron job.
Takes the values from your LDAP settings to sync.
Also, advise setting key items to 'on every login' in the list of objects. Then, any person in your LDAP whose account info hasn't been sync'd yet can still login and any changes to the LDAP info will be current in the mdl_users table of the Moodle DB.
'spirit of sharing', Ken