3-7z If the request packet contains no PPPoE tag, the ONU adds the tag (containing the UNI portinformation) to the request packet and forwards the packet to the OLT side.z If the request packet contains a PPPoE tag, the ONU directly forwards the request packet to theOLT side without adding any tag.Follow these steps to enable related protocol(s) on an ONU:To do... Use the command... RemarksEnter system view system-view —Enter ONU port view interface onuinterface-number —Enable related protocol(s) onthe ONUonu-protocol { stp |dhcp-snooping |dhcp-snooping information |pppoe } enableOptionalBy default:z RSTP is enabled on theONU.z DHCP snooping, DHCPsnooping Option82, andPPPoE+ are disabled on theONU.z When STP is enabled globally on the S7900E switch, you should enable STP on all ONUs.Additionally, configure STP correctly to ensure that no ONU can be selected as the STP root bridge;otherwise, anomaly may occur on the network.z STP runs normally only when all attached ONUs are H3C ONUs.Configuring the Multicast Mode of the ONUPrerequisites for multicast mode configurationThrough extended OAM, an OLT can be used to remotely configure the multicast mode of an ONU aseither IGMP snooping mode or multicast control mode.The configuration of a multicast IP address-to-multicast VLAN correspondence is used to add multicastaddress(es) to a multicast VLAN. Upon receiving an IGMP report message, the OLT determineswhether the multicast IP address contained in the message belongs to the multicast VLAN. If yes, theOLT generates a multicast forwarding entry in the multicast VLAN of the multicast IP address; otherwise,the OLT directly discards the message. A multicast IP address can belong to only one multicast VLAN.Follow these steps to complete the prerequisites for multicast mode configuration:To do... Use the command... RemarksEnter system view system-view —Enter FTTH view ftth —Add multicast address(es) to amulticast VLANmulticast vlan-id vlan-iddest-ip ip-address-list RequiredReturn to system view quit —
