The present invention provides a method for processing inter-domain link state information and a path computation element (PCE). The method includes: state information of unidirectional inter-domain links in the domain to which a first PCE belongs is transmitted by the first PCE to a second PCE, which needs to obtain state information of the unidirectional inter-domain links, wherein the unidirectional inter-domain links are unidirectional inter-domain links from border nodes of the domain to which the first PCE belongs to border nodes of adjacent domains. With the present invention, PCEs in two adjacent domains of the inter-domain links both have link state information of the inter-domain links in two directions. Whether it is Backward Recursive PCE-based Computation (BRPC), per-domain computation or Hierarchy PCE (H-PCE), PCEs that need path computation can have bidirectional inter-domain Traffic Engineering (TE) link information, thus making it possible to compute a bidirectional Label Switching Path (LSP).
METHOD FOR PROCESSING INTER-DOMAIN LINK STATE INFORMATION AND PATH COMPUTATION ELEMENT