Method and device for acquiring network topology

The embodiment of the invention provides a method for acquiring network topology and a related device, which are used for accelerating the collection of topology information and improving the topology discovery speed. The embodiment of the invention provides a method for acquiring a network topology, which is specifically applied to an XLDP network topology structure, and the network topology structure comprises a plurality of nodes including a first node and a second node used for acquiring the network topology. At the beginning of the work of the network topology structure, the first node obtains the information of the second node; the first node reports a first message to the second node according to the information of the second node, and the first message is used for notifying the second node of the topology condition of the first node; the first message at least comprises an identifier of the first node, an identifier of a third node serving as a neighbor node of the first node, and an identifier of a f