Method and apparatus for processing label distribution protocol conversation, label switching router

The embodiment of thehe present invention discloses a method and apparatus for processing label distribution protocol conversations, and a label switching router. The method includes steps: when discovering addion of a route in a mode of actively distributing DU label on the downstream, enquiring whether a forwarding equivalence class FEC corresponding with the route, sends label canceling message to a peer and receives a corresponding label releasing message of the label canceling message or not; when the peer has sent the label canceling message and has received the corresponding label releasing message, or does not have sent the label canceling message, distributing a label for the FEC; sending a label mapping message to the peer, wherein the label mapping message includes the FEC and distributed label. The embodiment of the invention is capable of avoiding that forwarding items of the peers are different due to deletion of the route and rapid addition of the route in a DU mode, ensuring normal forwarding of packets, so as to ensure communication service quality effectively.