The multi-VRF CE learns a client’s routes from an attached interface and installs the routes into the VRF that is associated with that interface. The PE learns the client’s routes from the VRF and installs them into the related VRF on the PE.
The multi-VRF CE learns a client’s routes through a routing protocol or a static route that propagates routes from the client to the multi-VRF CE. The PE learns the routes through a routing protocol or a static route that propagates routes from a specific VRF on the multi-VRF CE to the related VRF on the PE.