Point-to-multipoint multicast implementation method, network node and system

Abstract

Embodiments of the present invention provide a point-to-multipoint multicast implementation method, node and system, which are applicable to P2MP multicast in non-VPN scenarios, and can also be deployed when PE equipment does not support mLDP. The method is: the network side leaf node obtains the mLDP label and FEC information of the downstream user side leaf node through the mLDP mapping message of the downstream user side leaf node, and then sends the mLDP mapping message including the mLDP label and FEC information to the upstream network side root node, and generate forwarding entries, and then the network side root node searches or establishes RSVP P2MP LSP, and assigns label values ​​for the received FEC information, and the forwarding entry entries of each network side leaf node are associated with the label values ​​of the FEC information, At the same time, the root node on the network side sends its own mLDP label and FEC information to the upstream leaf node on the user side through the mLDP mapping message, and associates its own mLDP label with the RSVPP2MP LSP and the label of the FEC information. The embodiment of the present invention is used to realize 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...

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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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