2) then you configure it in cas.properties. here is a sample :
cas.authn.ldap[0].type=AUTHENTICATED
cas.authn.ldap[0].ldapUrl=ldap://
ldap1.domain.com:389 ldap://
ldap2.domain.com:389cas.authn.ldap[0].baseDn=ou=people,dc=domain,dc=com
cas.authn.ldap[0].searchFilter=uid={user}
cas.authn.ldap[0].dnFormat=uid=%s,ou=people,dc=domain,dc=com
cas.authn.ldap[0].pool-passivator=NONE
cas.authn.attribute-repository.ldap[0].pool-passivator=NONE
cas.authn.ldap[0].principalAttributeList=uid,mail,displayName ...