ldap_default_servers - anybody got an example?

[Keith Goettert <Keith@LightwaveAccess.net>]

I would like to use the ldap_default_servers configuration setting with 
my ldap querry.  So far I have been unable to discern how the variable 
replaces itself into a search.

Here is my settings

ldap_default_servers = localhost::389:www.anotherhost.com::389

and latter in a router...

condition = ${lookup ldap {/ou=AList,dc=alistmail,dc=net? .....

This doesn't work.  I get the error...

LDAP query error: unknown parameter "/ou=" precedes LDAP URL