In MLS, does the router create the shortcut entry and download it to the Layer 3 CAM table located in the Catalyst’s NFFC or MSFC?
No. Many people are of the opinion that MLS is simply a router running router NetFlow that learns a flow and then ships the results of this flow to a Catalyst. This is not the case. First, if it were the case, the flow would probably be over before the information could be learned by the Catalyst. Second, the NFFC learns the cache information totally by itself. It only needs to know the MAC address and VLAN information of the router (it learns this via MLSP).