Method, system and device for generating virtual private local area network site ID

The invention discloses a method, a system and a device for generating a virtual private local area network site ID. The method comprises the following steps: an operator edge device selects an unlabelled occupied identification (ID) for a self-subordinated site, transmits an selection announcement announcing the ID selected by the subordinated site to the adjacent operator edge device; within the time setting period after the selection announcement is transmitted, when the announcement transmitted by the adjacent operator edge device occupies the occupied announcement of the selected ID is received, or the announcement transmitted by the adjacent operator edge device selects the selection announcement of the selected ID and the priority level of the adjacent operator edge device is higher than the self priority level, an unlabelled occupied ID is selected again, and otherwise, the occupied announcement occupying the selected ID is transmitted to the adjacent operator edge device, thus simply and conveniently