The flowspec match tunnel-pop command enables BGP FlowSpec on a GRE tunnel interface.
The undo flowspec match tunnel-pop command disables BGP FlowSpec on a GRE tunnel interface.
By default, BGP FlowSpec is not enabled on a GRE tunnel interface.
Usage Scenario
By default, the BGP FlowSpec function does not identify the IP address of packets leaving the GRE tunnel. After the flowspec match tunnel-pop command is run on the GRE tunnel interface, the BGP FlowSpec function identifies the IP address of packets leaving the GRE tunnel.