Multiple squid servers + ldap authentication + wccp or "Super Proxy Script"

["chowalit.lab Chowalit Lab Linux" <chowalit.lab@xxxxxxxxx>]

Dear All,
    I have some problem about my web cache system. In my old system I
have 2 boxes squid with "Super Proxy Script" and cache_peer. My system
was ok. But next month I have plan to implement ldap authentication
into this web cache and change "Super Proxy Script" to wccp. In my
testbed, I have problem with ldap authentication. My web cache ask
ldap user twice. I think my "Super Proxy Script" provide both of squid
to client.
     How to implement and fix this problem?

Thanks