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Generalized MPLS differs from traditional MPLS<ref>GMPLS RFC 3945 "1.2. Multiple Types of Switching and Forwarding Hierarchies"</ref> in that it supports multiple types of switching, i.e., the addition of support for TDM, wavelength, and fiber (port) switching. For instance GMPLS is the ''[[de facto]]'' control plane of [[wavelength switched optical network]] (WSON).<ref>G. M. Bernstein, Y. Lee, A. Galver, J. Martensson, “Modeling WDM wavelength switching systems for use in GMPLS and automated path computation,” IEEE/OSA J. Optical Comm. Netw., vol. 1, no. 1, pp. 187–195, Jun. 2009. DOI: http://dx.doi.org/10.1364/JOCN.1.000187.</ref><ref>N. Sambo, N. Andriolli, A. Giorgetti, P. Castoldi, “Wavelength Preference in GMPLS-controlled Wavelength Switched Optical Networks,” Network Protocols and Algorithms, vol. 3, no. 2, pp. 110–125, 2011. http://www.macrothink.org/journal/index.php/npa/article/view/819/704</ref> The support for the additional types of switching has driven GMPLS to extend certain base functions of traditional MPLS and, in some cases, to add functionality.
These changes and additions impact basic [[label-switched path]] (LSP) properties: how labels are requested and communicated, the unidirectional nature of LSPs, how errors are propagated, and information provided for synchronizing the ingress and egress LSRs.
==How GMPLS works==
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