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Multicast flow forwarding method and its router and system

A router and multicast streaming technology, applied in the field of communications, can solve the problem of multicast data stream forwarding interruption, and achieve the effect of avoiding multicast data reception and playback errors

Inactive Publication Date: 2007-09-12
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a multicast flow forwarding method to solve the problem in the prior art that multicast data flow forwarding is interrupted 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.

Method used

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  • Multicast flow forwarding method and its router and system
  • Multicast flow forwarding method and its router and system
  • Multicast flow forwarding method and its router and system

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Embodiment Construction

[0042] In the present invention, when the unicast route arriving at the multicast source or the rendezvous point RP is changed (switched from the suboptimal route to the optimal route), the PIM router will continue to receive and send the multicast data stream before the multicast data flow is received from the new incoming interface. Forward the multicast data flow received from the original ingress interface. Only after the multicast data flow is received from the new ingress interface, the Prune message is sent to the original adjacent upstream router, and the multicast data stream received from the original ingress interface The broadcast data flow is discarded, so as to achieve the purpose of uninterrupted forwarding of the multicast data flow.

[0043] Referring to Fig. 1, it is the PIM router of the present invention that the unicast routing of the multicast source changes, resulting in a schematic flow diagram of the forwarding multicast stream when SPT is switched, spe...

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Abstract

The invention discloses a multicast transmitting method. When the unicast path from a router to multicast source or rendezvous point (RP) is switched from first route to second route, the corresponding adjacent upper router to the router and the second route establishes new multicast transmitting path and transmits multicast data stream through the original multicast transmitting path; when the router receives the multicast data stream from the new multicast transmitting path, it disconnects the original multicast transmitting path and transmits the multicast data stream through the new multicast transmitting path. And the method can avoid multicast data stream transmission interruption when the unicast path to the multicast source or rendezvous point (RP) is switched to cause multicast transmitting path switching.

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 Applications(China)
IPC IPC(8): H04L12/56H04L29/06
CPCH04L45/00H04L45/16H04L45/22
Inventor 徐小虎
Owner HUAWEI TECH CO LTD
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