Method for updating and processing upstream information of routing device, routing devices and network system

Abstract

The invention provides a method for updating and processing the upstream information of a routing device, routing devices and a network system. The method comprises that: a first routing device in a share network segment of a multicast tree receives a first joining request sent by a second routing device in the share network segment, wherein the first joining request carries RPF upstream neighborinformation of the second routing device and a source address of the multicast tree; and if the first routing device does not comprise a routing table entry and learns that the first routing device per se is a downstream device in the share network segment according to the source address, an upstream information is created to serve as the first routing table entry of the RPF upstream neighbor information. When the first routing device in the share network segment requests for joining the network system, by the upstream information carried in the joining request, the RPF upstream neighbors of other downstream devices in the network segment are set into the same forward device, so the generation of a plurality of different multicast data transmittal paths is avoided, and the occurrence of repetitive multicast data in the share network segment is radically prevented.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of communications, and in particular, to a method for updating and processing upstream information of a routing device, a routing device, and a network system. Background technique [0002] With the rapid development of the Internet, more and more multicast services have been applied. As a typical multicast routing standard, Protocol Independent Multicast-Sparse Mode (PIM-SM) has gained Wide range of applications. In the PIM-SM protocol, when a routing device needs to join a multicast tree, it will send a join request to the reverse-path forwarding (Reverse-path Forwarding, RPF for short) upstream device it considers. However, due to the fact that different routing devices in the same network segment may have inconsistent RPF routes, different downstream routers may send join requests to different upstream routers, resulting in multiple different group routes in the same network se...

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a method for updating upstream information of a routing device, a routing device, and a network system, to solve the problem in the prior art that the assertion election process itself takes a certain amount of time, so even if the method of triggering the assertion election in advance is adopted, It is still impossible to avoid the defect of repeated multicast data in the assertion election process, and realize a more effective method to fundamentally prevent the occurrence of repeated multicast data

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