Abstract: Generalized Multiprotocol Label Switching (GMPLS) also known by the name of Multiprotocol Lambda Switching is the extended protocol suite of MPLS to manage further classes of switching technologies and interfaces such as layer-2 switching, time division multiplexing, fiber switching and wavelength switching. In this paper we have discuss the requirement of enhancing the technologies, fundamental of Multiprotocol Label Switching (MPLS). Evolution of GMPLS is described in depth with the details of improvement in GMPLS over MPLS, protocol suits and GMPLS outstanding issues.

Keywords: GMPLS, MPLS, Survey, QoS, GMPLS Protocols