When the router removes the GRE encapsulation, pops one or more labels including the Bottom-of-Stack (BoS) label, it acts as a LER. The exposed packet are forwarded in the global routing table or in a service context. The LAG/ECMP hashing of the packet when forwarded follow the procedures of that specific forwarding context. see ‟Traffic Load Balancing Options” in the 7450 ESS, 7750 SR, 7950 XRS, and VSR Interface Configuration Guide.
When the router removes the GRE encapsulation, pops one or more labels and then swaps a label, it acts as an LSR. The LSR hashing for packets of a MPLS-over-GRE SDP or tunnel terminating on the GRE subnet follows a new procedure which is enabled automatically and overrides the LSR hashing option enabled on the incoming network IP interface (lsr-load-balancing {lbl-only | lbl-ip | ip-only | eth-encap-ip | lbl-ip-l4-teid}). For more details, see LSR Hashing of MPLS-over-GRE Encapsulated Packet in section Changing Default Per Flow Hashing Inputs of the 7450 ESS, 7750 SR, 7950 XRS, and VSR Interface Configuration Guide.