[389-users] Referral (10) (what does it mean)

hi All When i try to Delete a user from groups.. i get bellow ldapmodify -v -xZZ -D "cn=Directory Manager" -w 'testtest' -f get_groups.ldif modifying entry "cn=system-users,ou=groups,l=uk,dc=fosiul,dc=lan" ldap_modify: Referral (10) matched DN: dc=fosiul, dc=lan referrals: ldap://.uk.fosiul.lan:389 ldap://.us.fosiul.lan:389 ldap://.za.fosiul.lan:389 ldap://.us.fosiul.lan:389 ldap://.us.fosiul.lan:389 We have couple of ldap server ( one master , rest slave) do i have to define master server?? this is master server (ldap://.uk.fosiul.lan:389) what would be the commands ? Thanks