Creating forward only zones...

[Bob Vance]

You simply make the zone type "forward" -- no "master" or "slave"
involved.  One example is for a sub-domain that's been delegated and
when you're also using global forwarding.
E.g.:

options {
   ...
    forwarders {
        10.10.72.9 ;
        192.168.31.3 ;
    };
    forward only;
};

zone "test-sub.lab.sbm.com" {
    type forward;
    forward only;
    forwarders {
        10.10.120.12 ;
    };
};


This forwards "test-sub" name requests to 10.10.120.12 (which is also to
where it was delegated) instead of the globally defined
        10.10.72.9
or      192.168.31.3