METHOD, ROUTER AND COMMUNICATION SYSTEM FOR RAPID MULTICAST CONVERGENCE

摘要

A fast convergence method, router, and communication system for multicast are disclosed. In the fast convergence method, router, and communication system for multicast, active and standby outgoing interfaces and active and standby next hops for each unicast route reaching a multicast source are calculated, and then active and standby paths are constructed according to the calculated active and standby outgoing interfaces and next hops; when the active path fails, a multicast stream sent by the multicast source is received through the standby path and forwarded; because a node in the solution may dynamically send Protocol Independent Multicast (PIM) Join messages to construct active and standby paths according to the active and standby outgoing interfaces and next hops (namely, according to the routing result) calculated by use of unicast route, active and standby incoming interfaces and next hops of multicast do not need to be configured on the device statically, which may adapt to dynamic topology changes of the network and greatly expand the multicast stream protection scenarios.