This object sets how much to decrement the TTL of payload packets forwarded on this specific GMPLS out-segment when per-hop TTL decrementing is used, with zero meaning no decrement is applied here, a separate tunnel-wide object controls TTL decrement for the whole LSP, and the value cannot be changed once the segment's row status is active. An administrator configures this during segment setup for scenarios needing precise TTL behavior on individual path segments, such as supporting traceroute-style diagnostics across a GMPLS tunnel. With the documented default of 0, a newly created out-segment would apply no TTL decrement unless explicitly configured otherwise before activation.