Method and system for forwarding multicast service, onu and olt

Abstract

The present invention proposes a method and system for forwarding multicast services, an optical network unit and an optical line terminal, including: the ONU decapsulates the first multicast service message from the optical line terminal OLT, and according to its preamble information The logical link identifier LLID and the first multicast service forwarding identifier of whether the first multicast service is allowed to be received are judged. If the reception is allowed, the first multicast service message is sent to the user, otherwise, the first multicast service packet is discarded. Multicast service packets. The present invention reduces the processing load of the user of the ONU.

Description

technical field [0001] The present invention relates to Ethernet Passive Optical Network (EPON, Ethernet Passive Optical Network) technology, in particular to a method and system for forwarding multicast services, an optical network unit (ONU) and an optical line terminal (OLT). Background technique [0002] Figure 1(a) is a schematic diagram of a point-to-multipoint network structure for EPON. As shown in Figure 1(a), data is bidirectionally transmitted on a single optical fiber, and the upstream direction (that is, transmission from the Optical Network Unit (ONU, Optical Network Unit) to the Optical Line Terminal (OLT, Optical Line Terminal)) adopts time division multiplexing (TDM, Time-Division Multiplexing) transmission mode, the downlink direction (that is, transmission from OLT to ONU) adopts broadcast transmission. [0003] Fig. 1(b) is a schematic diagram of the internal cascading mode between the OLT and the ONU. As shown in FIG. 1( b ), each ONU includes a user a...

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Problems solved by technology

[0011] From the above process, we can see that when the OLT sends multicast services, if an ONU requests a multicast program, all ONUs under the same PON interface of the OLT can receive the multicast service flow, and the PON chip of the ONU Directly forward the data to the switching chip of the ONU, and the switching chip of the ONU judges whether the multicast service flow is forwarded according to the multicast MAC address table, which increases the processing burden of the switching chip of the ONU and wastes the PON chip of the ONU And the limited forwarding bandwidth of the switch chip, in the case of large network traffic, will cause data congestion, resulting in loss of user data

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