This read-write integer identifies the target ONU by its LLID, matching llidIfIndex in NMS-EPON-LLID-MIB; setting it writes buffered configuration for that ONU into nmsEponOnuBatchConfigTable, though newly updated ONU config afterward is not reflected back into the buffer, and setting it to 0 clears the buffer entirely, emptying nmsEponOnuConfigTable. Admins set this to select which ONU's batch configuration buffer they are populating or clearing before applying batch changes. For example, an admin sets this to a specific LLID to load that ONU's buffered config for review via nmsEponOnuBatchConfigTable, or sets it to 0 to clear the buffer before starting a fresh batch job.