PASS TRAFFIC BETWEEN ROUTE DOMAIN

Hi,

You have to disabled strict isolation:

the BIG-IP system allows traffic forwarding from that route domain to any route domain on the system, without the need to define a parent-child relationship between route domains. Note that in this case, for successful forwarding, you must disable the strict isolation feature on both the forwarding route domain and the target route domain (that is, the route domain to which the traffic is being forwarded).

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/tmos-ip-routing-administration-11-3-0/2.html

the problem is that your RD is no longer isolated and at the base it is the goal...

Regards