How to force OSPF on external addresses to go to the external network?

Question

Computer networks

There is a network with dynamic OSPF routing.

For some reason, even the external IP addresses of the network begin to communicate through the internal network.

Now I'm coping with this by explicitly specifying NAT rules (srcnat) so that the IP "goes" to the
external network, but some kind of universal solution is needed.

Someone faced similar?

Answer 1

Set filters for outgoing/incoming routes

Answer 2

specify what you want? routing on the color of addresses (gray, white) - deeply all the same...