We are in a situation that there are two authoritative servers for the same zone foo.com. For some reason, the update between both takes some time, so there is a situation that we hit test.foo.com in one server and, as this record is fresh and not yet reached the local dns server , the local says authoritatative but returns no answer and is not also forwarding , because it is authoritative.

How can I forward to another dns server if the local authoritative does not have an answer?