Topic summaryLabel-switched path Expand Summary Extracted from the Wikipedia article Multiprotocol Label Switching. Label-switched pathA label-switched path (LSP) is a path through an MPLS network set up by the NMS or by a signaling protocol such as LDP, RSVP-TE, BGP (or the now deprecated CR-LDP). The path is set up based on criteria in the FEC. Wikipedia source