Method, apparatus and system for forwarding a multicast stream

H - Electricity – 04 – L

Patent

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H04L 12/28 (2006.01)

Patent

CA 2630643

A method, router and system for multicast stream forwarding, the method includes the steps as follows: when the unicast path between a router and multicast source or rendezvous point RP is switched to the second route from the first route, the router establishes a new multicast forwarding path with the upper router according to the second route, and forwards the multicast stream by means of the old multicast forwarding path; when the said router receives the multicast stream through the new multicast forwarding path, the old multicast forwarding path is cut, and the multicast stream is forwarded by the new multicast forwarding path. By the usage of the method, the multicast stream forwarding blackout can be avoided when the switch of the multicast forwarding path happened due to the switch of the unicast path connected the multicast source or rendezvous point RP.

L'invention concerne un procédé, un routeur et un système pour l'acheminement de flux de multidiffusion. Le procédé comporte les étapes suivantes: lors de la commutation, sur un second trajet, d'un premier trajet d'unidiffusion entre un routeur et une source de multidiffusion ou un point de rendez-vous (RP), le routeur établit un nouveau trajet d'acheminement de multidiffusion avec le routeur en amont selon le second trajet et achemine le flux de multidiffusion par l'ancien trajet d'acheminement de multidiffusion; lorsque ledit routeur reçoit le flux de multidiffusion par l'intermédiaire du nouveau trajet d'acheminement de multidiffusion, l'ancien trajet d'acheminement de multidiffusion est coupé, et le flux de multidiffusion est acheminé par le nouveau trajet de multidiffusion. Ce procédé permet d'éviter une extinction de l'acheminement du flux de multidiffusion pendant la commutation du trajet d'acheminement de multidiffusion, due à la commutation du trajet d'unidiffusion connecté à la source de multidiffusion ou au point de rendez-vous RP.

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