This read-create Unsigned32, representing the lower 32 bits and not settable for a port-based flow, sets the Committed Information Rate of the Ethernet Flow in the access-to-network direction. It defines the guaranteed bandwidth this flow is allowed toward the network, whereas a port-based flow simply inherits the port's rate. For example, an administrator sets the A2N CIR to represent a 10 Mbps guaranteed rate for a regular flow carrying a customer's contracted bandwidth.