Network, Networking Technology, Data Communication Terms, Glossary and Dictionary

LSP: Label Switched Path

Label Switched Path (LSP), a concept in the Multiprotocol Label Switching (MPLS) networking, is a path through an MPLS network, set up by a signaling protocol such as LDP, RSVP-TE, or CR-LDP. The path is set up based on criteria in the forwarding equivalence class (FEC). The path begins at a Label Edge Router (LER), which makes a decision on which label to prepend to a packet based on the appropriate FEC. It then forwards the packet along to the next router in the path, which swaps the packet's outer label for another label, and forwards it to the next router.

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LSP: Label Switched Path