This read-create Unsigned32, in bytes, sets the Committed Burst Size for this policer; though its description text duplicates the neighboring rlQosPolicerCir field's wording, the object's own name and units, bytes rather than kbps, identify it as the burst-size parameter rather than the rate itself. An admin tunes this burst allowance to determine how much traffic can briefly exceed the committed rate in a short burst before being treated as out-of-profile, accommodating naturally bursty traffic like file transfers. For example, an admin policing a class to a 1 Mbps CIR might set this burst size to a few thousand bytes so brief traffic spikes are not immediately penalized, while sustained excess still gets the configured policer action.