Patent ID: 7817542

Claim:
A method for fast service convergence, used for communications between Autonomous Systems, comprising: presetting, by an Autonomous System Border Router (ASBR), a route forwarding table including a forwarding table and a status table, each forwarding table item in the route forwarding table comprising information of a preferred route and a secondly-preferred route, wherein a primary out port index in the forwarding table is associated with status of out port in the status table, the port including a physical port, a logical channel or a next hop interface; detecting, by the ASBR, the status of the preferred route in the forwarding table item, if a failure is detected in the preferred route, setting the status of the out port in the status table as unavailable; receiving, by the ASBR, a service packet, and querying a forwarding table item in the route forwarding table corresponding to the service packet and finding the status of the corresponding out port according to the primary out port index, if the status of the out port in the status table is available, forwarding the service packet through the preferred route; if the status of the out port in the status table is unavailable, forwarding the service packet through the secondly-preferred route.