Ways to route traffic via MPLS TE tunnels

        As far as I know, in L3VPNs which are implemented on top of MPLS-TE - traffic is routed automatically via the tunnel, since the route's NH information is learned via MP-BGP and this NH is also the head end of the tunnel - hence the VPN traffic will flow automatically via the tunnel(correct me if I'm wrong).
Are there some scenarios in which one has to manually route traffic via MPLS-TE tunnels? or use some other methods to achieve this ? I heard about IGP shortcut, and I'm not sure what it does and what are the use cases of it in regard to MPLS-TE tunnels.

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