This is update, a Gauge32 that UCS increments every time this NiErrStats object is actually refreshed, acting purely as a change-detector rather than a meaningful error measurement itself. It matters to a polling tool watching this interface: if update stops incrementing between polls, the crc, tooLong, and tooShort counters shown alongside it have not actually been refreshed, so a flat reading should not be read as 'zero new errors.' For example, seeing update tick from 118 to 119 between two 5-minute polls confirms this interface's data is fresh; if it stays at 118, treat that poll as stale.