Method and equipment for detecting IP address conflict in autonomous system

The invention provides a method and equipment for detecting IP address conflict in an autonomous system. The method comprises the following steps: equipment in the autonomous system builds a message carrying the interface IP address information of the equipment when a novel interface enables the interior gateway protocol; and the message is sent to all the equipment in the autonomous system, the message enables the equipment in the autonomous system, which receives the message, to generate the message by other equipment except for the equipment which receives the message, and an indication indicating IP address conflict in the autonomous system is given out when the IP address information in the message and the interface IP address information of the equipment are the same. By adopting the invention, the IP address conflict can be detected in the autonomous system, so as to improve the maintainability and the reliability of IP network.