Point-to-multipoint multicast traffic engineering tunnel system and its path selection method and device

Abstract

A point-to-multipoint multicast traffic engineering tunnel system and a path selection method and device thereof. The invention provides a method and device for selecting a path of a point-to-multipoint multicast traffic engineering tunnel. The method includes: determining the shortest path from the root node to the first leaf node as the path from the root node to the first leaf node, and adding the path to the reference path set; taking any leaf node in the remaining leaf nodes as the target node , when the path determination principle from the root node to the current target node indicates that the most bandwidth-saving path is preferred, if there are alternative paths in the path from the root node to the current target leaf node, then select one of the alternative paths and determine it as the root The path from the node to the current target leaf node; if there are remaining leaf nodes with undetermined paths, add the paths determined in the previous steps to the reference path set and return to the previous step. The device corresponds to the method, and can reduce the load of the root node to replicate traffic, and improve the transmission performance of the multicast network.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a point-to-multipoint multicast traffic engineering tunnel system and a path selection method and device thereof. Background technique [0002] With the rapid rise of IPTV and other video services, the network puts forward higher requirements for efficient and reliable multicast transmission, mainly in terms of QOS, replication capability, protection, and restoration. Currently, RSVP-TE (Resource ReServation Protocol-Traffic Engineering, a resource reservation protocol based on traffic engineering extension), which is only used in P2P (point to point, point-to-point) unicast scenarios, can already meet the above requirements. Therefore, the RSVP-TE technology applied to the P2MP (point to multiple point, point-to-multipoint) multicast scenario is an inevitable trend in the development of video transmission services. [0003] Please refer to figure 1 , shows a network topolo...

AI Technical Summary

Problems solved by technology

However, since multicast traffic needs to be replicated at the fork point, a large amount of traffic replication needs to be performed at the root node, which increases the performance requirements of the root node. When there are many multicast leaf nodes, the root node will There is congestion

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