Patent ID: 8218429

Claim:
A method of multicast traffic redundancy protection, comprising: detecting an original active router; switching a Virtual Route Redundancy Protocol (VRRP) state, by a Virtual Route Redundancy Protocol (VRRP) state switching module if the original active router is faulty, and selecting a new active router; notifying, by the VRRP state switching module, a Protocol Independent Multicast (PIM) routing protocol module of the new active router after the VRRP state switching; and selecting, by the PIM module, the new active router in the VRRP as a Designated Router (DR) in the PIM; wherein the process of notifying the PIM module of the new active router after the state switching and selecting the new active router as the DR by the PIM module comprises: notifying, by the VRRP state switching module through a parameter transmission, the PIM module of the new active router after the VRRP state switching; and selecting, by the PIM module through an Assert message, the new active router as the DR.