This read-write Unsigned32 holds the lower 32 bits of the maximum-allowed Committed Information Rate (CIR MAX) ceiling on a QoS Flow Policer, paired with cmQosFlowPolicerCIRMaxHi for the full value. It matters as the low-order half of that governance ceiling, and for CIR MAX values that fit within 32 bits, this is effectively the only field that needs to be nonzero. For example, capping a policer's CIR at 500 Mbps (which fits within 32 bits) would be represented entirely in cmQosFlowPolicerCIRMaxLo, with cmQosFlowPolicerCIRMaxHi left at zero.