what is LABEL SWITCH PATH in MPLS

what is LABEL SWITCH PATH(LSP) in MPLS.
pawanopensourceAsked:
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Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
http://en.wikipedia.org/wiki/Label_Switched_Path

"In MPLS networking, a Label Switched Path (LSP) is a path through an MPLS network, set up by a signaling protocol such as LDP, RSVP-TE, BGP 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 prefix 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. The last router in the path removes the label from the packet and forwards the packet based on the header of its next layer, for example IPv4. Due to the forwarding of packets through an LSP being opaque to higher network layers, an LSP is also sometimes referred to as an MPLS tunnel."
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ITStreetsCommented:
Label-switched path (LSP) is the path defined by the labels through LSRs between end points.
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