DNS domain up transfer.

I have created One domain dns server my.domain.com and
two sub domain dns servers: branch1is.my.domain.com and
branch2is.my.domain.com.
I have delgated authority for the two sub domain servers and for the domain server for their domains.
I have configured the NS and the glue A record of the sub domains on the my.domain.com server. The domain server can request and resolv the sub domains for hosts that are configured to its domain(down). But the sub domains can't see each other(up) unless there is a my.domain.com ip address in the resolv.conf file.
I am using bind 8 on solaris machine. Is this normal installation or I am missing something.
Abuch

I mean, the sub domains cannot forward requests to other servers in the mydomain.com domain tree. i.e If I want to resolv a host in b1is.mydomain.com from b2is.mydomain.com domain do I have to insert the mydomain.com ip in the resolv.conf file of the b2is.mydoman.com hosts? Or is there a method to forward the query to uper domain without writing the ip in the sub domains resolv.conf files.
Thx.

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