Maintaining information of TE link

A method for maintaining information of Traffic Engineering (TE) link, comprising:

• receiving, by a Path Computation Element (PCE) in a Multi-Protocol Label Switching (MPLS) network, initial information of all TE links that is reported by a Label Switching Router (LSR) after the LSR starts, and storing the initial information into a TE database (TEDB);
• for the information of each TE link, determining, by the PCE, initial values of pending bandwidth, reserved bandwidth and unreserved bandwidth of each TE-Class in the information of the TE link, and storing the initial values into the TEDB;
• and
• receiving, by the PCE, a Constraint-based Routed Label Switched Path (CRLSP) calculation request from a Path Computation Client (PCC), calculating a Label Switched Path (LSP) according to the information of each TE link stored in the TEDB, and updating pending bandwidth, reserved bandwidth and unreserved bandwidth of TE-Class in the information of TE link corresponding to the LSP, wherein the information of TE link corresponding to the LSP is stored in the TEDB,
• wherein determining, by the PCE, the initial values of pending bandwidth, reserved bandwidth and unreserved bandwidth of each TE-Class in the information of the TE link and storing the initial values into the TEDB comprises initializing, by the PCE, the pending bandwidth and reserved bandwidth of each TE-Class in the information of the TE link to 0.