[squid-users] howto use squid_ldap_auth with many ldap servers ?

hello,

I installed and configured squid to authenticate users from a ldap
active directory server.

It works well but it remains a problem : as the auth server is from
Microsoft, it needs to be rebooted periodically :)) for hotfixes,
configuration updates and so on...

So I'd like to declare the slave AD server as an alternate ldap server
for squid. I tried this :

auth_param basic program squid_ldap_auth -d -R -b \
            dc=w2k,dc=icsb,dc=fr -D cn=ldapusr,cn=Users,dc=w2k,dc=icsb,dc=fr \
            -w ldap_passwd -f "sAMAccountName=%s" \
            ad1.w2k.icsb.fr \
            ad2.w2k.icsb.fr

but when ad1 goes down, ldap requests don't go to ad2.

Is there a way to use more than 1 ldap server ?

regards,

-- 
Eric Belhomme