The development of Multiprotocol Label Switching technology and the rapid advance of core technology all optical networking produce a sort of even more tight Internet Protocol over Dense Wavelength Division Multiplexing integrated scheme :Multiprotocol Lambda Switching. It combines the advantage of controlling capability of MPLS and large capacity switching and transmitting of optical switching device. It allows the service layer to dynamically apply to transmission layer for bandwidth through the existing control plane. First

this article introduces MPλS network structure

then labors MPλS routing and wavelength distributing scheme and discusses the limitation of MPλS and its related protocol including the extended GMPLS technology.