Method and network device for fast service convergence

A network device enabling fast service convergence and used for communications between Autonomous Systems, comprising:

• a storage unit, adapted to store information of each forwarding table item, each of the forwarding table item comprising information of a preferred route and a secondly-preferred route;
• a detecting unit, adapted to detect the operation status of the routes;
• a route status setting unit, adapted to set the route status, wherein, if the preferred route is detected as available, the route status setting unit setting the status of the preferred route in the forwarding table item as available, if a failure is detected in the preferred route, the route status setting unit setting the status of the preferred route in the forwarding table item as unavailable;
• a service packet receiving unit, adapted to receive a service packet;
• a route status querying unit, adapted to query route information related to the service packet and obtain information and status of the preferred route and the secondly-preferred route;
• a service packet forwarding unit, adapted to forward the service packet in accordance with the information and status of the route obtained by the route status querying unit, wherein when the route status querying unit determines that the status of the preferred route is available, the service packet is forwarded through the preferred route;
• when the route status querying unit determines that the status of the preferred route is unavailable, the service packet is forwarded through the secondly-preferred route.