When an LDAP application sends a search to the Directory specifying a base DN which is missing a "=" in the DN, you will see the following warning in the WARN log of the DSA.
WARN: LDAP: DN component missing '=':"
If you execute the following LDAP search
% dxsearch -h localhost -p 19389 -b "garbage,o=democorp,c=au" -s sub "(sn=LINK)"
The following will be logged in the WARN log of the DSA
20090227.073930.703 WARN : LDAP: DN component missing '=': garbage,o=democorp,c=au
A LDAP Distinguished Name (DN) is always in the following format
attr=value, attr=value, ......