[CentOS] Specifying 2 LDAP Server for auth

Hi !

We are planing on deploying an ldap master and replica to serve as our new 
authentication server for our soon to be RedHat cluster. But, we need to be 
able to function if the master is down for whatever reason. So, I tried to 
specify 2 servers in the setup-authentification servername section, 
separated by a comma, but it doesn't seem to work.

So, is it possible to specifying 2 ldap servers in the config ?

If a ldap server goes down, what are the fall-back for authentification ? I 
have check "cache information", but in my tests, if the ldap server is down, 
pretty much nothing works correctly.

Regards,