This read-create Unsigned32 holds the upper 32 bits of the Committed Information Rate (CIR) of a specific per-COS QoS Shaper on an access port, combined with cmAccPortQosShaperCIRLo for rates exceeding 32 bits. It matters only when a per-COS access-port shaper needs to guarantee an unusually large committed rate that would overflow a single 32-bit field, such as a multi-gigabit business Ethernet access port. For example, guaranteeing 3 Gbps committed on a high-bandwidth access-port COS queue would require a nonzero cmAccPortQosShaperCIRHi together with the corresponding low-order CIR value.