Multicast stream forwarding method, router and system

A router and multicast streaming technology, applied in the transmission system, data exchange through path configuration, electrical components, etc., can solve the problem of multicast data stream forwarding interruption, etc., and achieve the effect of avoiding multicast data reception and playback errors.

Active Publication Date: 2012-02-22
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Embodiments of the present invention provide a method for forwarding multicast streams, which is used to solve the problem of multicast data stream forwarding in the prior art when the router reaches the multicast source or the unicast route of the rendezvous point RP is changed and the multicast forwarding path is switched. interruption problem

Method used

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  • Multicast stream forwarding method, router and system
  • Multicast stream forwarding method, router and system
  • Multicast stream forwarding method, router and system

Examples

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Embodiment Construction

[0040] In the embodiment of the present invention, when the unicast route to the multicast source or the rendezvous point RP is changed (switched from the suboptimal route to the optimal route), the PIM router continues Receive and forward the multicast data flow received from the original ingress interface. Only after the multicast data flow is received from the new ingress interface, it will send the Prune message to the original adjacent upstream router, and will receive it from the original ingress interface. The multicast data flow is discarded, so as to achieve the purpose of uninterrupted forwarding of the multicast data flow.

[0041] see figure 1 , for the PIM router in the example of the present invention, the unicast route of the multicast source changes, causing the flow diagram of the forwarding multicast stream when the SPT is switched, specifically including:

[0042] Step S1, the PIM router learns that the unicast route used for RPF calculation to reach the mu...

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Abstract

A router and system for forwarding a multicast stream is provided. when a unicast route from a router to a multicast source or a rendezvous point changes from a first route to a second route, the method includes establishing a new multicast forwarding path between the router and a second upstream router corresponding to the second route, keeping forwarding a multicast stream received via an prior multicast forwarding path, pruning the prior multicast forwarding path if the router receives the multicast stream via the new multicast path, and forwarding the multicast stream via the new multicast forwarding path. Therefore, multicast stream will be forwarded continuously during the switchover process.

Description

technical field [0001] The invention relates to the communication field, in particular to a multicast data flow forwarding method when the unicast route from the router to the multicast source changes, and a router and a system applied to the method. Background technique [0002] Unicast routing protocol-independent multicast protocol (Protocol Independent Multicast, PIM) is a multicast routing protocol independent of unicast routing protocol, it does not depend on a specific unicast routing protocol, using the existing unicast routing table Implement reverse path forwarding (Reverse Path Forwarding, RPF) check. The unicast routing protocol Independent Multicast-Sparse Mode (Protocol Independent Multicast-Sparse Mode, PIM-SM) explicitly sends Join or Prune (Join / Prune) messages through the PIM router to establish a network based on the Rendezvous Point (RP). Shared tree (Rendezvous Point Tree, RPT) or source-based source path tree (SPT), multicast data flows along the share...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/28
CPCH04L45/00H04L45/16H04L45/22
Inventor 徐小虎
Owner HUAWEI TECH CO LTD
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