Disclosed are an information acquisition method, device and router. The method comprises: transmitting a first link request to one or more neighboring routers supporting a communication with a switchover router, the first link request being used to request a router link state advertisement (LSA) before a switchover; receiving the router LSA fed back by the one or more neighboring routers; determining whether the router LSA meets a preset condition to get a determination result; if the preset condition is determined to be unmet, acquiring information of a neighboring router of the switchover router according to the received router LSA. The present invention addresses the problem of how to acquire the information of a neighboring router when no neighboring information is available after a main/standby switchover in related technology.