This read-create integer object is the table index that uniquely identifies a specific Flow row in the E-Line Flow table, distinguishing one provisioned point-to-point Ethernet flow from another on the device. An administrator relies on this index to reference a particular E-Line circuit when configuring or querying its associated attributes like circuit name and administrative state. For example, an inventory system would enumerate all cmElineFlowIndex values to build a list of every E-Line flow currently configured on the device.