This read-create INTEGER, in bits per second, sets the committed rate enforced by the simple port rate limiter, and is not applicable when the rate limit is disabled. An admin sets this to the actual throughput cap they want enforced on the port, distinct from the more elaborate port-shaper mechanism, for simple straightforward rate capping. For example, an admin capping a port to 5 Mbps to prevent one device from monopolizing shared uplink bandwidth would set this CIR value to 5,000,000 bps.