Method, system and device for efficiently recovering PCEP tunnel

The invention relates to a method, a system and a device for efficiently recovering a PCEP tunnel. The method mainly comprises the following steps: mapping an abstract PCEP model into a unified configuration model; persistently storing the tunnel and path calculation result created by the PCE in a unified configuration model format; when the version is upgraded, the PCEP tunnel is directly recovered through the persistent file generated by the unified configuration model; and after upgrading and restarting, only the tunnels with changes in the restarting period are issued, and tunnel full-quantity synchronization is not carried out. When the device version is upgraded, the service data and the PCEP tunnel are recovered through the unified persistent file, so that the problem of multi-source recovery time sequence is solved, and the service recovery speed is greatly accelerated; after the equipment is upgraded and started, the PCE only needs to synchronize the changed tunnel during the restarting period, so th