MX 400 how to assign Group Policy to specific network

[MST1]

Experts,

I am looking a way to assign specific Group policy not to one client but for all living on a specific network. 

We dont use vlans on MX, we use Track clients by IP address, and routed mode. Is there any way? 

[NolanHerring]

You could try do do group policy by VLAN, so that any devices on that VLAN would be placed into that group policy by default

[MST1]

Yes, but I keep all the vlan on L3 MDF Juniper stack rather than MX. On MX I use only route to main MDF and dont use any vlans. 

I can do client by client choosing all from 192.x.100.0 network but this is not the best approach. 

[PhilipDAth]

If there are multiple downstream VLANs, there there is no nice way of doing this.

You really only have the option of doing it globally, which obviously affects everyone.