pg_hba & ldap

Hi all!

I have a problem with ldap authentication, I have a ldap string like this:

host all             all             0.0.0.0/0 ldap 
ldapserver="10.20.90.251 10.20.90.252 10.10.90.251 10.10.90.252" 
ldapport=389...

It is correct? if the firs server is down, pg will go to the next one to 
continue authenticating?

It's a pg11 and ldap is an ipa server

thanks a lot,

Diego