Embodiments of the present invention provide a state switching method and router bridge (RB). The method comprises: a first RB switches a neighbor state with a second RB from a Report state to a transition state when the MAC address of the first RB port connected to the second RB changes from an old MAC address to a new MAC address; The first RB sends TRILL Hello packets which are no less than a predetermined number and carry the new MAC address; the first RB switches the neighbor state with the second RB from the transition state back to the Report state after receives the TRILL Hello packets carrying the new MAC address. The method solves the problem that RBs having a Report neighbor state need to negotiate neighbor relation again after the MAC address of a RB port changes for the reason of network management, and reduces interrupt time of data packet transmission.
