This read-create Unsigned32 holds the upper 32 bits of the Committed Information Rate (CIR) on a Quality-of-Service Shaper, combined with cmQosShaperCIR (the lower bits) to represent rates beyond the 32-bit range. Admins need this high-order field when provisioning very high-bandwidth committed rates, such as multi-gigabit shapers, that would overflow a single Unsigned32. For example, guaranteeing a 5 Gbps CIR on a high-capacity Ethernet flow requires setting a nonzero cmQosShaperCIRHi together with the appropriate cmQosShaperCIR low-order value, since 5 Gbps exceeds what the lower field alone can represent.