Point-to-multipoint multicast realization method, network nodes and system

Abstract

The embodiment of the invention provides a point-to-multipoint multicast realization method, network nodes and a system, which are applicable to P2MP multicast under a non-VPN scenario and capable of realizing deployment when a PE device does not support an mLDP. The method is that: network-side leaf nodes acquire mLDP labels and FEC information of downstream user-side leaf nodes through mLDP mapping messages of the downstream user-side leaf nodes and then the mLDP mapping messages which include the mLDP labels and the FEC information are sent to upstream network-side root nodes and then forwarding table items are generated; the network-side root nodes search for or establish an RSVP P2MP LSP and distribute label values for the received FEC information; forwarding table items of the different network-side leaf nodes are associated with the label values of the FEC information and at the same time, the network-side root nodes send the mLDP labels and the FEC information of the network-side root nodes to the upstream user-side leaf nodes through the mLDP mapping messages and associate the mLDP labels of the network-side root nodes with the RSVP P2MP LSP and the FEC information. The point-to-multipoint multicast realization method, the network nodes and the system are used for realizing P2MP multicast.

Description

technical field [0001] The invention relates to the communication field, in particular to a point-to-multipoint multicast realization method, network node and system. Background technique [0002] With the development of IP (Internet Protocol, Internet Protocol) in the network, more and more applications use the IP network for data transmission. For applications such as multimedia conferencing, real-time online games, and IPTV (IP Television, Internet TV), the data transmission has the characteristics of point-to-multipoint (or multipoint-to-multipoint). [0003] Compared with the unicast-based data transmission method of IP network, IP multicast technology realizes point-to-multipoint data transmission in IP network. For multiple data receiving nodes, data does not need to copy all traffic at the sending end, but according to the network The IP forwarding path in the network is copied on demand at the corresponding nodes. Generally speaking, only one copy of data is transm...

AI Technical Summary

Problems solved by technology

In this way, mLDP can be connected to P2MP, but this kind of application is connected to VPN. On the control plane, VPN negotiation needs to be carried out based on relatively complex protocols, and PE node forwarding entries must be established based on VPN information, so this solution is not applicable In the P2MP multicast scenario of non-VPN applications, and in the existing multicast scenario, the PE node must perform mLDP protocol processing, which is relatively complicated to implement, and cannot be deployed when the PE device does not support mLDP

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