Hi @MakisFil 

Thanks for posting in our business forum.

I would appreciate it if you could make a complete title instead of this.

About your question, if you want to do something like that, you should first at least set up the VLAN on the ER605. If you want to separate the network in LAN, that's VLAN.

Next up, you need to route specifically to a different WAN on ER605 if you have one, you need to use Policy Routing.

But if you are talking about the one WAN on ER605 but three routers on the ER605 VLANs, you should not bother setting this. It does not make sense because it is just how a simple network works.