MPLS-over-GRE through next hop-based dynamic tunnel

You can configure next-hop-based MPLS-over-GRE tunnels along with firewall filter-based tunnel decapsulation. MPLS-over-GRE tunnels create a tunnel composite next hop, an indirect next hop, and a forwarding next hop to resolve a tunnel destination route. 

You can configure dynamic GRE next-hop-based tunnel by including the gre next-hop-based-tunnel statement at the [edit routing-options dynamic-tunnels] hierarchy.