9To do… Use the command… RemarksEnter system view system-view —Enter ONU port view interface interface-typeinterface-number —Enable the ONU downlinkbandwidth allocationpolicy and prioritizehigh-priority packetsbandwidth downstream policyenableRequiredBy default, the downlinkbandwidth allocation policy isdisabled and high-prioritypackets are not prioritized.Configure the ONUdownlink bandwidth limitbandwidth downstream{ max-bandwidth value |max-burstsize value } *OptionalBy default, the maximumbandwidth is 999994 kbps, andthe maximum burst buffer is8388480 bytes.z The configuration of high-priority packet buffering (as shown in Sending buffer size of the OLT port)and that of the downlink bandwidth limit take effect only when the downlink bandwidth allocationpolicy is enabled.z The configured downlink bandwidth limitation takes effect only on known unicasts, but not onunknown unicasts, multicasts, or broadcasts.z The sum of the minimum uplink bandwidths configured for all the existing ONU ports under an OLTport cannot exceed 921600 Kbps, namely, 900 Mbps.Configuring QoS at the ONU SidePriority mapping on the ONU portWhen the ONU receives packets on an ONU port, it assigns local precedence to the packets accordingto the 802.1p-to-local precedence mapping table. Table 12-3 shows the default 802.1p-to-localprecedence mapping table.Table 12-3 Default mapping between CoS precedence values and local precedence valuesCoS precedence Local precedence0 01 02 13 14 25 26 37 3
