This read-create Unsigned32 holds the lower 32 bits of the Committed Information Rate (CIR) of a specific per-COS QoS Shaper configured directly on an access port. Admins set this to guarantee a specific COS class its committed bandwidth right at the access port, the customer-facing edge of the network, rather than only at a network-side shaper further downstream. For example, guaranteeing the access port's COS-6 (voice) queue a committed 5 Mbps, an admin would set cmAccPortQosShaperCIRLo on that COS's shaper row to represent that 5 Mbps rate.