VRFs are always enabled and, by default, all routing is done in VRF 0. To use additional VRFs, assign a VRF ID to an interface. All routes relating to that interface are isolated to that VRF specific routing table. Interfaces in one VRF cannot reach interfaces in a different VRF.
If some traffic does have to pass between VRFs, route leaking can be used. See Route leaking between VRFs.
Enable Advanced Routing in System > Feature Visibility to configure VRFs.
To configure a VRF ID on an interface in the GUI:
Go to Network > Interfaces and click Create New > Interface.
Enter a value in the VRF ID field.
Configure the other settings as needed.
To add the VRF column in the interface table, click the gear icon, select VRF, and click Apply.
To configure a VRF ID on an interface in the CLI:
config system interface edit test_interface ... set vrf 14 next end