(Optional) Configuring a TTL Processing Mode for a GRE Tunnel

To enable a GRE tunnel to process TTLs carried in packets, configure the GRE tunnel to process these TTLs in pipe or uniform mode.

Perform the following steps on routers at both ends of a GRE tunnel.

Run system-view
The system view is displayed.
Run slot slot-id
The slot view is displayed.
Run gre ttl-mode { pipe | uniform }
A TTL processing mode is configured for the GRE tunnel.
Run commit
The configuration is committed.