Patent ID: 8107484

Claim:
A method for implementing packet routing, wherein a core router in a backbone network advertises routing information that carries address information of the core router, and a border router that receives the routing information, if an edge network connected with the border router comprises a more detailed address prefix covered by an address prefix advertised in the routing information, registers a mapping relationship between the more detailed address prefix information and the border router address at the core router, comprising: receiving, by the core router, a packet which is forwarded by a router to the core router according to aggregate address prefix information advertised by the core router in a routing table of the router; searching for, by the core router, a best route matching a destination address of the packet according to the mapping relationship between address prefix information and border router address information registered on the core router, wherein the best route is a route in longest match with the destination address; and forwarding, by the core router, the packet to a corresponding border router via a tunnel destined for the border router according to the obtained best route.