This read-write Unsigned32 holds the higher 32 bits of the 64-bit threshold value for this LAG threshold entry. It is required whenever the LAG's monitored counter, accumulated over long uptime, needs a trip point beyond 32-bit range, working together with cmLagThresholdValueLo. For example, an administrator monitoring cumulative received octets on a high-traffic LAG over months would need a nonzero value here to express a multi-terabyte threshold.