problem with topology (bigip dns version 12.x.x)

Hello, I'm considering upgrading to version 12.x.x. but I found that topology doesn't work under specific condition.

 

All types of resources are "CNAME".

 

condition: 1. Wide IP (A) :

 

2. pool1(cname) : 1.com

 

pool2(cname) : 2.com

 

3) DNS Express or named : CNAME 3.com.

 

4)loadbalancing mode : topology

 

region1 : poo1 weight 100

 

region2 : poo2 weight 50

 

test: in region2, when I look up domain " A".

 

bigip dns(gtmd) responses "2.com". It works well.

 

but when I lookup DNAME,TXT,etc, Bigip dns(named or dnsexpress) responses "3.com".

 

it's wrong. and recursive dns can be cached. it's problem.

 

(When I set wideip(CNAME) under same condition, I got same results )

 

When CNAME resource, it depends on CNAME resource regardless of type.

 

in case, gtmd have to response, not named(or zxfrd).

 

to solve problem, what can I register data with named or zxfrd? help me, please.