This counts the number of times an SNTP-derived timestamp used in FCIP protocol exchanges expired on this link. FCIP uses timestamps to validate the freshness of certain frames, and a climbing count here typically points to a clock synchronization problem between the local and remote entities, such as NTP/SNTP drift, rather than a data-path or bandwidth issue. If both ends of an FCIP link have significant clock drift because their NTP servers are unreachable or misconfigured, this counter would climb steadily even while the raw IP path between them is perfectly healthy.