MD (multicast domain) based multicast VPN (virtual private network) traffic optimization method and equipment

Abstract

The invention provides an MD (multicast domain) based multicast VPN (virtual private network) traffic optimization method and equipment. The technical scheme includes that the control equipment acquires multicast tunnel resource information configured by a source PE (provider edge) device for a VPN and private network multicast streams needing to be received by each PED device, when a multicast distribution tree switching request sent by the source PE device aiming for the private network multicast streams is received, data multicast group addresses are allocated to the private network multicast streams according to the acquired information, and the source PE device switches the private network multicast streams to Data-MDTs (multicast distribution trees) corresponding to the private network multicast streams. By the method and equipment, multicast tunnel resources on the PE devices can be saved, consumption of public network multicast routing table items and invalid flooding of public network multicast traffic are reduced.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a multicast virtual private network (Multicast VPN, MVPN) traffic optimization method and device. Background technique [0002] Multicast VPN is a multicast transmission technology based on MPLS L3VPN network. The multicast VPN implemented by using the multicast domain (Multicast Domain, MD) scheme is called MD MVPN. [0003] The basic idea of ​​the MD scheme is to deploy a Protocol Independent Multicast (PIM) routing protocol in the backbone network, and assign a unique multicast address in the backbone network to each MVPN, called default multicast Group (Default-Group). A service provider edge (Provider Edge, PE) device connected to the MVPN in the backbone network establishes a Default-Group public network default multicast distribution tree (Default Multicast Distribution Tree, Default-MDT) for the MVPN. When a private network multicast packet needs...

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Problems solved by technology

[0013] It can be seen from the above examples that in extreme cases, a separate Data-MDT needs to be established for each private network multicast flow, which puts great pressure on the tunnel resources on the PE device. Moreover, when the tunnel resources are insufficient, the shared When Data-MDT is used, the shared Data-MDT may degenerate into Default-MDT, causing invalid flooding of public network multicast traffic.

At the same time, because Data-MDT actually exists in the form of (P-S, P-G) public network multicast routing entries on the public network, the multicast routing resource consumption of PE devices and P devices is also very large.

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